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Please wait a minute... For Selected: Download Citations EndNote Reference Manager ProCite BibTeX RefWorks Toggle Thumbnails Select THE PRELIMINARY DISCUSSION ON SOIL DESICCATION OF ARTIFICIAL VEGETATION IN THE NORTHERN REGIONS OF CHINA Weixi Yang Scientia Silvae Sinicae    1996, 32 (1): 78-85.   Abstract （810）   HTML （8）    PDF （653KB）（778）       Knowledge map    Save The serious soil drification, which is being confronted in the course of construction of artificial vegetation represented by artificial plantation in the northern regions of China, is put forward in this paper. Soil desiccation is the mainly expressive form of soil deterioration of artificial vegetation in northern regions where there is less precipatation, the principal characteristic of soil desiccation is critical deficit of soil water continuously for a long time in the affecting scope of plant root system because of extra transpration of plant. The precipitation cannot compensate for water consumption effectively, surface soil crusts and soil compactness increases, which results in obvious declination of plant growth, even make plant shivelled and dead in the range of large area. The soil desiccation has become seriously potential danger of the construction of artificial vegetation in tills region. In my opinion, the direct reason, which causes soil desiccation of artificial vegetation, is the improper selection of vegetation type, too high community density and too high community productivity. The prevention and control strategy is as the follows:In the guidance of correct thought of vegetation construction, according to local bio-climatic productivity, vegetation type is selected in the light of local condition, community density is decreased subtantially, community productivity is adjusted and controled rationally, the final purpose is to keep balance between water consumption by plant transpiration and compensation of soil water, to further keep continuous stability and high yield of community. Reference | Related Articles | Metrics Cited: Baidu(260) Select A Review on Litter Decomposition in Forest Ecosystem Guo Jianfen;Yang Yusheng;Chen Guangshui;Lin Peng;Xie Jinsheng Scientia Silvae Sinicae    2006, 42 (4): 93-100.   DOI: 10.11707/j.1001-7488.20060417 Abstract （939）   HTML    PDF （186KB）（1775）       Knowledge map    Save Decomposition of forest litter and simultaneous release of bioelements is one of the fundamental pathway of the flow of nutrient and energy in forest ecosystems, and an important component of the global carbon budget. The aim of this review is to summarize the changes of nutrient and chemical components during the decomposition, the factors controlling litter decay rate and its measurement. Decomposition of plant litter refers to the physical and chemical processes involved in reducing litter to its elemental chemical constituents. It includes two stages. First, litter is broken down by detritivores to small pieces which can be chemically reduced. Second, through the activities of micro-organisms (bacteria and fungi) these small pieces of organic matter are further reduced and mineralized into basic inorganic molecules. Also the course of nutrient dynamics during decomposition often can occur in three sequential phases, including an initial nutrient release through leaching, a net immobilization of nutrients by decomposer microorganisms and nutrient release from the litter, usually at a rate paralleling mass loss. However, the pattern of immobilization and release varies among species and ecosystems, and any particular litter type may not show all three phases. Litter decomposition rates are controlled by climate, litter chemistry, and by soil organisms. Climate has a direct effect on litter decomposition due to the effects of temperature and moisture. However, as a result of the climatic control of soil formation and nutrient cycling, it is to be expected that climate also has an indirect effect through the climatic impact on litter chemistry. Actual evapotranspiration (AET) is used as an index for the climatic control on decomposition. Mean AET in the humid tropical region is higher than in both the temperate and the mediterranean region and this results in rapid decomposition of litter. Especially, decomposition of litter (including root litter) contributes about 70% to the total annual carbon flux. Thus, changes in AET due to global warming will affect the global carbon budget through effects on the decomposition pathway. At a global scale, litter chemistry is only of secondary importance in explaining variation in litter decomposition rates. N and P concentrations, C/N and C/P ratios, lignin concentration and lignin/N and lignin/P ratios are considered as primary litter chemistry parameters, of which the lignin/N ratio and P related parameters exert significant influence on litter decomposition rates in the tropics. However, there is no consistent chemical predictor of litter decomposability in the temperate region. Also, there are indications that the chemical control of litter decomposition depends on the phase of the decomposition process. Generally, readily decomposable carbohydrates are lost at the initial stage, subsequently the decay-resistant materials such as lignin and cellulose are accumulated. High initial N, P and K concentrations lead to high initial decay rates, but to low long-term litter decay. Thus, there is clearly a need for more long-term studies on the chemical control of litter decomposition rates in various climatic regions. In addition, physical and chemical properties of soils and microbial communities also affect litter decomposition. Litter bag represent the most standardized method for studying litter decomposition, but it has several limitations. Litter bag may alter decomposition rates by altering litter microclimate, hindering soil contact and excluding litter macrofauna. Nevertheless, litter bags allow comparisons among species and experimental manipulations. Currently, the three most widely used indices of litter decomposition rate in forest ecosystem are release rate of CO2, decay constant of k value and weight loss rate of litter. Despite intensive research in the last decade, uncertainties of litter decomposition in forest ecosystems still remain for further studies: long-term in situ observation; use of uniform methods to obtain comparable data; research on the mechanism of litter decay using models; the effects of global climatic changes on litter decomposition in forest ecosystems; and the assessment of management activities controls on the litter decay and nutrient release in forests. Related Articles | Metrics Cited: Baidu(210) Select Advances in Forest Soil Enzymology Yang Wanqin;Wang Kaiyun Scientia Silvae Sinicae    2004, 40 (2): 152-159.   DOI: 10.11707/j.1001-7488.20040227 Abstract （752）   HTML    PDF （193KB）（1275）       Knowledge map    Save Soil enzyme is the enzymes mainly from the plant exudation and excreted by microorganisms and released from plant and animal relict decomposition. Soil enzyme system plays a key role in the soil biochemical process and is closely related to the cycle of mass such as carbon, nitrogen, phosphorus and sulfur etc. and energy fluxes in forest ecosystem. Presently, soil enzymology has become an essential tool by which monitor soil enzyme activities almost all studies on forest ecosystems. Soil enzymology focus mainly on the enzymatic activity dynamics in litter decomposition process, relationships between soil enzymes and vegetation features and soil biological community dynamics, variations of soil enzymes in the ecological interface between plant and soil, soil enzymatic activity used as bioindicators of forest soil quality, and effects of anthropic activity on forest soil enzyme activity. In view of the function and ecological significance of soil enzyme, it can be expected that research in the field of soil enzymology in twenty-first century will include as follows: (1) investigating soil enzyme system differentiation in the forest ecosystems; (2) determining soil enzyme activity used as the integrative evaluation index of forest soil quality; (3) exploring the interactive effects of vegetation dynamics and soil enzymes; (4) measuring the activities of soil enzymes in degraded forest ecosystem; (5) monitoring the activities of soil enzymes used as soil quality indicators of manmade forests; (6) studying the effects of anthropic activity on forest soil enzyme system. It is suggested that the interaction between the soil enzymes and forest ecosystem should be studied on the basis of the aspects of soil enzyme system differentiation, which will be helpful to understand the plant litter decomposition, the mass cycle, function and ecological significance of the soil enzyme and energy flux in forest ecosystem, and to explore the degraded mechanism of forest ecosystems and its responses on eco-environment disturbance. Related Articles | Metrics Cited: Baidu(207) Select A STUDY OF THE AERO-ANION CONCENTRATION IN FOREST RECREATION AREA Wu Chucai;Zheng Qunming;Zhong Linsheng Scientia Silvae Sinicae    2001, 37 (5): 75-81.   DOI: 10.11707/j.1001-7488.20010513 Abstract （774）   HTML    PDF （149KB）（1199）       Knowledge map    Save The studies on the concentration of aero anion in some south China forest recreation areas showed: (1) The aero anion concentration has differences in different forest types. (2) In forest surroundings, the correlation between aero anion concentration with temperature and moisture are significant. (3) Water body has different effect on aero anion concentration in forest recreation areas. (4) There have been aero anion daily variance and yearly variance. (5) The structural material has effect on aero-anion concentration. Related Articles | Metrics Cited: Baidu(201) Select A STUDY ON COMPARISON OF MEASURING WATER-CONSUMPTION FOR TRANSPIRATION IN POPLAR Fengjue Liu,Shikai Zheng,Guansheng Ju,WRN Edwards,Yande Wu Scientia Silvae Sinicae    1997, 33 (2): 117-126.   Abstract （888）   HTML （6）    PDF （967KB）（631）       Knowledge map    Save A study on com parison of five methods for the transpiration water-comsum ption conducted in poplar plantation in Shandong province (Populus deltoides cv."Lux"ex.Ⅰ-69/55) and Ningxia Autonomous Region (Populus opera) from 1989 to 1991.The five measuring methods are whole-tree potometer, quick-weighing method, LI-1600 porometer, heat pulse technique and Penman-Monteith method.The results of the study are as follows:(1) Supposing that the relative value of daily transpiration waterconsumption per tree measured with whole-tree potometer is 100%, the relative value measured by quick-weighing method is 130%-140%, the relative value measured with LI-1600 porometer is 291% and the relative value measured by heat pulse technique is 90.14%.(2) Supposing that the relative value of the daily transpiration water-consum ption per tree measured by heat pulse technique is 100%, the relative value measured by quick-weighing method is 88% in 6-year-old tree and 112% in 2-year-old tree.(3) The value measured with LI-1600 porometer is 30%-90% higher than that measured by quick-weighing method in Ningxia arid zone and 140%-220% higher than that in more humid area of Shandong Province.(4) The value measured by Penman-Monteith method is very close to that measured with whole-tree potometer and that measured by heat pulse technique with errors less than 2%. Table and Figures | Reference | Related Articles | Metrics Cited: Baidu(200) Select THE NEIGHBOURHOOD PATTERN——A NEW STRUCTURE PARAMETER FOR DESCRIBING DISTRIBUTION OF FOREST TREE POSITION Gangying Hui,Klaus von Gadow,Matthias Albert Scientia Silvae Sinicae    1999, 35 (1): 37-42.   Abstract （1076）   HTML （14）    PDF （175KB）（794）       Knowledge map    Save There is an ever-increasing need for information relation to the spatial structure of uneven-aged mixed forests. Forest structure may be described on three levels:the level of species mingling, the level of tree size differentiation and the level of the tree point distribution. Suitable parameters are available for characterizing mingling and size differentiation, but the same cannot be said about the distribution of tree positions. The neighbourhood pattern, a new spatial parameter presented in this paper can be assessed with little effort in the field, without having to measure distances. It can be used to describe and reproduce stands with certain spatial characteristics(clumped, regular or random). Table and Figures | Reference | Related Articles | Metrics Cited: Baidu(191) Select AN ANALYSIS OF POPULATION GENETIC STRUCTURE OF MASSON PINE BY ISOZYME TECHNIQUE Ge Song;Wang Mingxiou;Chen Yuewu null    1988, 24 (4): 399-409.   Abstract （825）      PDF （614KB）（575）       Knowledge map    Save Population genetic structure was studied using isozyme loci and phenotypic characters in five seperate clusters of masson pine (Pinus massoniana Lamb.) in Shaxian County of Fujian Province.By polyacrylamide gel electrophoresis and measuring twelve phenotypic characters,we investigated the population genetic structure of masson pine at molecular and phenotypic levels.The results were as follows: (1) The level of genetic variability in the population of masson pine,was relatively high.The percentage of polymorphic loci (P) was 64.5%±4.2%.The average number of alleles per loci (A) was 1.65±0.054.The average expected heterozygosity (H6) was 0.216±0.0089. (2) Similar to reports for other conifers,the differentiation level of masson pine was relatively low.The average genetic distance (D) among the five clusters was 0.0047.2.4% of the allozyme variability was attributed to the differentiation among the clusters while the remaining 97.6% resided within the different clusters.The analysis of variance for the twelve phenological gharacters gave the same general trend and average genetic variation within the different clusters was 94% approximately,with same 6% resided among clusters. The aspects of population genetic structure of masson pine and some problems of isozyme analysis are discussed. Related Articles | Metrics Cited: Baidu(182) Select STUDY ON ESTABLISH AND ESTIMATE METHOD OF COMPATIBLE BIOMASS MODEL Tang Shouzheng;Zhang Huiru;Xu Hui Scientia Silvae Sinicae    2000, 36 (zk): 19-27.   DOI: 10.11707/j.1001-7488.2000S103 Abstract （775）   HTML    PDF （171KB）（924）       Knowledge map    Save Forest biomass is a basic quantity character of the forest ecological system. Biomass data are foundation of researching many forestry and ecology problems, thus accurate measurement of biomass is very important. Establishing biomass models is a major way to biomass estimation. There were a serious shortcomings in the models established previously, i.e.the results were incompatible for models of each component, in other words, the sum of estimated biomass of wood, bark, branches and foliage was unequal to estimated biomass of total aboveground, the sum of estimated biomass of wood and bark was unequal to estimated biomass of stem, the sum of estimated biomass of branches and foliage was unequal to estimated biomass of crown. There fore how to obtain the compatibility is stile a difficult problem for biomass estimate. A new method, nonlinear joint estimate, was proposed in this paper, and compared with method of adjustment in proportion. To the different methods of establishing models, five alternative methods were designed, then one of them was determined as a optimum method through the analysis and comparison. The optimum method took stem as a basis component and adopted two steps joint estimate, structure of models was as follows; the first step, total aboveground\;W1=f2(x)+f5(x), stem W2=f2(x), crown W5=f5(x); the second step, wood W3=f3(x), bark W4=f2(x)-f3(x); branch W6=f6(x), foliage W7=f5(x)-f6(x)In this paper, the progressive variable selection method was used to select models structure, and weighted least squares method was used to estimate parameters for reducing errors of non-homogeneous variance. At meantime, the paper used five indices to evaluate models, they were coefficient of variation for parameters C%, total relative error RS%,average relative error EE%,average absolute value of relative error RMA% and prediction precision P%. All of researches shown above in this paper took Larix olgensis as an example. Related Articles | Metrics Cited: Baidu(180) Select DENSITY, STORAGE AND DISTRIBUTION OF CARBON IN CHINESE FIR PLANTATION AT FAST GROWING STAGE Fang Xi;Tian Dalun;Xiang Wenhua Scientia Silvae Sinicae    2002, 38 (3): 14-19.   DOI: 10.11707/j.1001-7488.20020303 Abstract （705）   HTML    PDF （138KB）（815）       Knowledge map    Save Based on the data collected by located observation, the density, storage and spatial distribution of carbon were studied in Chinese fir plantation at fast growing stage. The results showed that carbon density in different organs of Chinese fir ranged from 0.4558 gC·g-1 to 0.5003 gC·g-1,and was in the order as: bark>leaf> trunk>root>cone >branch. The carbon density in the perennial branch and leaf was higher than that of the youngers'. Carbon density in shrub, herb and floor was 0.4344?gC·g-1, 0.4009 gC·g-1 and 0.4341 gC·g-1, respectively. Carbon density of the surface soil was a little lower than that of the second surface soil. Carbon storage in different organs was basically in direct proportion to the biomass of respective organ ,biomass of trunk made up 47 7% of the standing forest biomass, correspondingly its carbon storage amounted for 47.5% of the standing forest carbon storage , the rest in branch, leaf, bark and root, etc., seized 52.5%. The total carbon storage in Chinese fir plantation at fast growing stage was up to 127.88 tC·hm-2,including 35.883 tC·hm-2 in the plant, and 91.997 tC·hm-2 in the soil (including floor). The annual net productivity of Chinese fir plantation at fast growing stage was 7.351 t·hm-2a-1, stored carbon up to 3.489 tC·hm-2a-1. Forest was an important sink of atmospheric CO2. Related Articles | Metrics Cited: Baidu(174) Select A REVIEW OF STUDIES ON WATER STRESS AND DROUGHT TOLERANCE IN TREE SPECIES Xinsheng Hu,Shiji Wang Scientia Silvae Sinicae    1998, 34 (2): 77-89.   Abstract （896）   HTML （3）    PDF （1062KB）（659）       Knowledge map    Save Water deficit is one of the most important environmental factors which limit plant growth, especially in arid and semiarid areas.Influences of water stress may be involved in many aspects on plant growth and development.Therefore, know ledge of these mechanisms in physiology, biochemistry, genetics and drought tolerance may assist in decision making in the future for drought resistance breeding.In this paper, we commented on and discussed some results obtained recently from extensive studies in the field in tree species, including influences on DNA transcription and expression, on PS Ⅰ and PS Ⅱ system, on stomata movement, on adaptation and response, on water use efficiency, mechanism of drought resistance, screening of drought tolerance index, and tolerance engineering.We presented our points in these aspects, especially in tolerance engineering.We presented our points in these aspects, especially in tolerance engineering and screening of effective traits by which selection is undertaken. Table and Figures | Reference | Related Articles | Metrics Cited: Baidu(171) Select STUDY ON RELATIONSHIP BETWEEN SOIL ENZYMIC ACTIVITIES AND PLANT SPECIES DIVERSITY IN FOREST ECOSYSTEM OF MT.JINYUN Yang Wanqin;Zhong Zhangcheng;Tao Jianping;He Weiming Scientia Silvae Sinicae    2001, 37 (4): 124-128.   DOI: 10.11707/j.1001-7488.20010420 Abstract （636）   HTML    PDF （137KB）（892）       Knowledge map    Save By the methods of sampling soil profiles which A,B,and C represent humus horizons,illuvial horizons,and parent materials horizons respectively,relationships between the activities of soil enzymes (which include catalase,invertase,protease,and acid phosphatase) and plant species diversity in three secondary successional plant communitites of forest ecosystem in Mt.Jinyun were studied in this paper.Results showed that different degree′s correlations existed between soil enzymic activities and plant species diversity indice (PSDI) which included Shannon-Wiener H′index and Hill′s species diversity indice family NA,moreover,the degree of correlation depended on the horizon of soils,the type of enzymes,and the life form of plants (i.e.,tree,or shrub or grass).The degree of correlation between PSDI and soilenzymic activities decreased by the orders of A→B→C.The most significant correlation with PSDI was the activity of soil catalase,and in turn,was the activity of soil invertase,On the whole,the correlation between soil enzymic activities and tree layer′s PSDI was the most evident.Tree layer′s PSDI were positively and significantly (P<0.05) or very significantly (P<0.01) correlated with the activities of catalase and invertase of A and B horizons,and of protease and acid phosphatase of A horizons.Grass layer′s PSDI were also positively and significantly (P<0.05) correlated with the activities of catalase and invertase of A horizons.Shrub layer′s PSDI were not significantly correlated with soil enzymic activities. Related Articles | Metrics Cited: Baidu(159) Select A Discussion on the Compensation of Forest Ecological Benefit Fei Shimin;Peng Zhenhua;Zhou Jinxing;Yang Dongsheng Scientia Silvae Sinicae    2004, 40 (4): 171-179.   DOI: 10.11707/j.1001-7488.20040431 Abstract （665）   HTML    PDF （149KB）（856）       Knowledge map    Save By analysis on the present situation at home and abroad of the ecological benefit compensation, it offers some experiences to further perfect and build the compensation mechanism of forest ecological benefit, and it will play a active roll on protecting ecological environment and accelerating forestry sustainable development. The necessity, principle and path of establishing the compensation mechanism of forest ecological benefit, as well as compensation standard were discussed, it will offer scientific basis to further perfect the compensation mechanism of forest ecological benefit in our country.Setting up the compensation mechanism of forest ecological benefit, not only will provide the steady funds source of managing and protecting forest resources, and will be important for recognizing the value of forest ecological benefit, and resolve radically the dynamic and mechanism problems of the commonweal forest construction,which will produce a widespread and profound influence on China forestry and ecological construction Related Articles | Metrics Cited: Baidu(154) Select Soil Active Carbon Pool under Different Types of Vegetation Jiang Peikun Scientia Silvae Sinicae    2005, 41 (1): 10-13.   DOI: 10.11707/j.1001-7488.20050103 Abstract （819）   HTML    PDF （134KB）（923）       Knowledge map    Save Soils under three types of vegetation were selected for this study, and samples were analyzed for different fractions of carbon and soil nutrients. It can be found that broad-leaved evergreen forest contained more microbial biomass (MBC) and the ease of oxidation of carbon (EOC) compared with Chinese Fir and Masson Pine stands. Soil water-soluble organic carbon (WSOC) were measured relative lower abundance for Chinese Fir compared with broad-leaved evergreen and Masson Pine forest. The profile distribution of MBC and EOC appeared a decline trend with depth. The percentages that total organic carbon (TOC)presented as WSOC, MBC and EOC were ranged in 0.31%～1.18%, 0.9%～2.51% and 7.03%～29.52% respectively. Soil under Masson Pine forest was the richest abundance in WSOC%, followed by broad-leaved evergreen forest and Chinese Fir was the poorest. EOC% of soil under broad-leaved evergreen was much more than those under the other two forests. Distribution of WSOC of soil from surface to the deep as percentage of TOC was increased greatly, but as for EOC%, the reserve appeared to be true. Soil active carbon were not only significantly correlated to TOC but also interrelated themselves. Related Articles | Metrics Cited: Baidu(153) Select VEGETATIVE PROPAGATION AND CLONAL BREEDING OF FOREST TREES Zhu Zhiti null    1986, 22 (3): 280-290.   Abstract （754）      PDF （769KB）（517）       Knowledge map    Save Vegetative propagation, as one of the methods for forest tree propagation, has been well known and widely used for almost several centuries, but it is just recently that it has been used in tree improvement procedure for carrying out clonal breeding and clonal afforestation. This paper systematically reviewed its various roles as played in tree improvement works: (1) for preservation of the super genotypes; (2) for establishment of clonal seed orchards; (3) for mass propagation of select clones (plus trees, seedlings, and hybrids); (4) for clonal test and selection of best clones; (5) for screening of seed parents for breeding values; (6) for estimating genetic parameters; (7) for physiological studies and other potentialities of trees.If vegetative propagation is used in clonal breeding, there are some problems which should be considered with caution, such as (1) juvenility and uniformity are two basic criteria for the initial material of vegetative propagation of plus trees in clonal breeding; (2) successive rejuvenation is required to keep the propagated materials in a constant juvenile state; (3) to test the clones in planting application and to select them in the test are the reasonable procedure for clonal breeding; (4) planting of multiclones in plantation is desirable for widening genetic foundation; (5) use hybrid F1 clones in tree planting represents an attractive approach worthy to be practised in clonal breeding. Related Articles | Metrics Cited: Baidu(141) Select A STUDY ON EVALUATION OF NATURAL RESTORATION FOR DEGRADED KARST FOREST Yu Lifei;Zhu Shouqian;Ye Jingzhong;Wei Luming;Chen Zhengren Scientia Silvae Sinicae    2000, 36 (6): 12-19.   DOI: 10.11707/j.1001-7488.20000609 Abstract （1296）   HTML    PDF （157KB）（825）       Knowledge map    Save Based on study of component,structure,function of degraded Karst forest in the natural restoration process in Maolan National Reserve of Guizhou Province,three evaluation indexes such as restoration potential degree (RP),restoration degree(RD),restoration speed(RS) and their calculating methods were proposed.Variation and comprehensive evaluation of RP,RD and RS of community feature indexes which reflected component,height,coverage,seedlings/total trees,dominance and biomass were analyzed.The results showed that there were the highest RP between the lower and the next to higher succession stage,so as that natural restoration of degraded community was a process in which lower community was replaced by its next higher one successively.There were higher RP but lowest RD and slower RS in the early stage;the highest RP,the fast RS and moderate RD in the mid-stage;the lowest RP,the slowest RS and the highest RD in the late stage.The RP of community was slower than that of community feature indexes,and the RS of total function was slower than its part one.In community feature indexes,RS of component,height,coverage,seedlings/total trees and dominance were faster than that of biomass,the fact indicated that RS of structure was fast than that of function.The natural restoration strategy was that the regeneration in early stage changed into the community structure adjustment in mid-stage,and finally to the structure and function coordination or improvement in late stage.The normal community component,physiognomy,structure could be presented after 40 to 50 years natural restoration,but it take a long time to restore total community function. Related Articles | Metrics Cited: Baidu(138) Select MONITORING AND EVALUATION INDICATOR SYSTEM ON SANDY DESERTIFICATION OF CHINA Shangwu Gao,Baofang Wang,Lingyi Zhu,Junhou Wang,Yugui Zhang Scientia Silvae Sinicae    1998, 34 (2): 1-10.   Abstract （940）   HTML （3）    PDF （33928KB）（614）       Knowledge map    Save China is a country seriously affected by desertification it is the main content of combating desertification to protect the environmental resources forits sustainable development, to keep informed about the spatial and temporal changes of desertification for an effective implementation of macro control and management. For this purpose, the coverage of vegetation, the occupation ratio of bare sandy land and the soil texture are determined as three evaluation indicators of sandy desertification degree, depending on the configuration and ecotope of the earth surface. These 3 indicaltors show the productivity of a specific land from different aspects. A comprehensive mathematical model to evaluate sandy desertification degree was set up. According to the national conditions and the requirements of desertification monitoring by remote sensing, these evaluation indicators proposed in this paper audio-visual are, convenient and practical, which can be used not only to evalue the desertification degree of land but also to draw desertification distribution maps through visual interpretation on satellite images or on computer screen with digital imagety on pixel level. This monitoring and evaluation indicator system is testified to be applicable to classification and assessment on spatial distribution of desertification by using remote sensing and computer techniques after field investigation and verification in arid, semi-arid and dry affected sub-humid areas. Table and Figures | Reference | Related Articles | Metrics Cited: Baidu(129) Select STUDY ON GROWING MEDIUM AND GROWTH LAW FOR CONTAINERIZED SEEDLING STOCKS GROWN IN GREENHOUSE Deng yu;Liu Zhifeng Scientia Silvae Sinicae    2000, 36 (5): 33-39.   DOI: 10.11707/j.1001-7488.20000514 Abstract （627）   HTML    PDF （554KB）（775）       Knowledge map    Save By regular seedling growing monitoring and statistic analysis on height,diameter, shoot DW(abbariviation of dry weight),root DW, total DW and of shoot DW to root DW of container-grown seedlings in Toona sinensis A.Juss.Roem, Larix kaempferi sied,et iucc. Gordon, Platycladus orientalis L. Franco and Pinus tabulaeformis Carr. some growing media with productive significance were screened, and the growth laws of those four northern sub-tropical tree species which grown in containers in greenhouse were obtained. The results got from our study could provide some useful basis for production management of other containerized seedling stocks grown in greenhouse for those same tree species. Related Articles | Metrics Cited: Baidu(129) Select Lidar Remote Sensing Technology and Its Application in Forestry Pang Yong;Li Zengyuan;Chen Erxue;Sun Guoqing; Scientia Silvae Sinicae    2005, 41 (3): 129-136.   DOI: 10.11707/j.1001-7488.20050322 Abstract （845）   HTML    PDF （232KB）（1852）       Knowledge map    Save Lidar (light detection and ranging) remote sensing is a breakthrough of active remote sensing technology in recent years. It has shown enormous potential for forest parameters retrieval. Lidar remote sensing has the unique advantage of providing horizontal and vertical information at high accuracies. Especially it can be used to measure forest height directly with unprecedented accuracy. This article introduces the basic principle of lidar remote sensing and the lidar systems of large footprint and small footprint. The status of the technology, the retrieval methods of forest parameters such as tree height, biomass, canopy vertical structure and crown closure, and the prospect of the application of lidar technology in forestry have been reviewed in detail in this paper. Related Articles | Metrics Cited: Baidu(128) Select THE EFFECTS OF LAND USE CHANGES ON THE DISTRIBUTION OF SOIL ORGANIC CARBON IN PHYSICAL FRACTIONATION OF SOIL Wu Jianguo;Zhang Xiaoquan;Wang Yanhui;Xu Deying Scientia Silvae Sinicae    2002, 38 (4): 19-29.   DOI: 10.11707/j.1001-7488.20020404 Abstract （707）   HTML    PDF （252KB）（896）       Knowledge map    Save Studying the effects of land use change on soil organic carbon(SOC) by means of soil physical fractionation may help to understand the stability of SOC. According to 25 years historic data of land use in the Guyuan region of Ningxia, China, the land use type were classified into natural secondary forests dominated by Quercus liaotungensis or Populus davidiana, brushwood, 13,18,25-year-lod larch ( Larix principis-rupprechtii) plantation, rangeland and cropland. The SOC content and its fraction in soil physical fractionation (light-fraction organic matter(LF-OM) and particulate organic matter (POM)) and unprotected soil organic carbon pool in 0～110 cm depth of soil for these land uses were investigated. It was found that the proportion of SOC in LF-OM was lower in natural secondary forests than other land use ways, i.e., larch plantation, rangeland and cropland. The differences among plantations, rangeland and cropland were not significant. The SOC content in LF-OM in cropland and rangeland was 46% and 14% respectively lower than natural secondary forest, and those for plantations were over doubled and 27% higher respectively than cropland and rangeland. The proportion of SOC in POM was higher in plantations and cropland than the natural secondary forests, but these for rangeland is near the natural secondary forests. The SOC content in POM for cropland and rangeland were 38% and 25% respectively lower than natural secondary forests, and those for plantations were 79% and 47% respectively greater than cropland and rangeland. The proportion of SOC in unprotected SOC pool was lower for natural forests than cropland and plantations. The stability of SOC can been showed by analyzing SOC fraction in soil physical fractionation and unprotected soil organic carbon,while SOC content in this fractionation can indicate content of unstable SOC. The comparison of the SOC content and its fraction in soil physical fractionation and unprotected soil organic carbon pool infer that conversion of natural forests into cropland or afforestion in rangeland would cause the destabilization of SOC, while afforestion in cropland or conversion of natural forests into rangeland would have no obvious impacts on the stabilization of SOC.Land use change has obvious impacts on the SOC content and its fraction in soil physical fractionation of unprotected SOC pool in 0～50 cm soil depth.These SOC content and its fraction in soil physical fractionation of unprotected pool decreased with increased soil depth for different land uses and there is significant difference for them among different groups of soil layers of surface soil layer (0～10 cm), soil layers with rich roots, soil layers with few roots and bottom soil (below 90 cm),but there is no significant differences for them within in same soil layers. Related Articles | Metrics Cited: Baidu(126) Select Forest Carbon Storage in China Estimated Using Forestry Inventory Data Li Haikui;Lei Yuancai;Zeng Weisheng Scientia Silvae Sinicae    2011, 47 (7): 7-12.   DOI: 10.11707/j.1001-7488.20110702 Abstract （885）   HTML    PDF （939KB）（1209）       Knowledge map    Save In this study, we used biomass regression model to estimate biomass of arbor forest, took carbon-included rate in different tree species as the transferring coefficient from biomass to carbon stock, and further summed a single tree to plot and weighted means to province level. The carbon storage of arbor forests in China were estimated based on original data of 7th national forest continuous inventory. In the same time, carbon storage of open forests, scatted trees and "four-sides" trees were estimated by weighted mean conversion factors, and carbon storage of bamboo and shrubbery were estimated by regression model. The results showed that most of the forest carbon storage was distributed in the southwestern and northeastern China. Arbor forests were a main body of forest carbon storage in China. Carbon storage of plantations was more than 15% of total arbor forests in China, and carbon storage and density of broad leaf trees were higher than that of conifer trees. Related Articles | Metrics Cited: Baidu(125) Select Effects of Water Stress on Photochemical Quenching and Non-photochemical Quenching of Chlorophyll a Fluorescence in Four Tree Seedlings Shi Shengqing;Yuan Yuxin;Yang Minsheng;Liang Haiyong;Zhang Jinxiang Scientia Silvae Sinicae    2004, 40 (1): 168-173.   DOI: 10.11707/j.1001-7488.20040128 Abstract （772）   HTML    PDF （177KB）（995）       Knowledge map    Save The changes of photochemical quenching(qP) and non-photochemical quenching(qN)of chlorophyll a fluorescence in leaves of four tree seedlings (Gleditsia sinensis,Juglans regia, Diospyros kaki and Diospyros lotus) were different between two different water stress ways:detached drought treatment and potted drought treatment. After 4 hours dehydration by leaf detaching,the qP values had significant decrease except J. Regia, only 6 hours later, the qP values compared with contrast decreased significantly in four tree seedlings(P>0.05), but the range of reduction(G. sinensis, J. regia and D. lotus) was just 2.5% to 6.4%. D. kaki,however,got to 31.3%. While the qN values increased significantly with conducting dehydration of the detached leaves. However, the qP values of four species showed no significant decrease when they were growing in pots under soil water stress(40%～60%RWC) for 30 days; and the qN values decreased obviously with a exception in J. regia, which was consistent with that of detached leaf treatment. The results suggested that some difference or changes in mechanism of excess light energy dissipation might perform in four seedlings by short-term and long-term water stress. Related Articles | Metrics Cited: Baidu(123) Select STUDIES ON A WEB AND 3S-BASED SUPPORTING SYSTEM FOR FOREST-FIRE PREVENTION INTELLIGENT DECISION Wang Nihong Scientia Silvae Sinicae    2002, 38 (3): 114-119.   DOI: 10.11707/j.1001-7488.20020320 Abstract （712）   HTML    PDF （183KB）（773）       Knowledge map    Save In the history of our earth,forest-fires have destroyed large areas of woodlands,doing great damages to environment,natural resources,other properties,and even human life,therefore,theories and practice in forest-fire prevention have always been the center of people's attention.This paper,in light of the author's perennial scientific research,introduced to the application of forest-fire prevention technology,espeically the extensive research on the supporting system for forest-fire prevention decision through technological problems solved during 3 stages within the recent decade.Examples were as follows:the establishment of large-area system,the operation of self-adapting display resolution,basic graphic processing techniques,Web-based bulletins,and applications of 3S(GIS,RS,GPS) and DSS.With the continuous development and extending application of high tech in networks and 3S,the research methodology for forest-fire prevention has changed a lot,thus the technical application will gradually be consolidated. Related Articles | Metrics Cited: Baidu(118) Select PLANT SPECIES DIVERSITY IN WUYISHAN NATIONAL NATURE RESERVE Lan Siren Scientia Silvae Sinicae    2003, 39 (1): 36-43.   DOI: 10.11707/j.1001-7488.20030106 Abstract （672）   HTML    PDF （187KB）（911）       Knowledge map    Save Based on the sampling data, species richness, species diversity index and evenness index of plant communities in Wuyishan national nature reserve were discussed. The change law of community diversity in Wuyishan national nature reserve were as follows: species richness, species diversity index and evenness of plant communities increased along with the vegetation succession trend from needle leaved forest, needle broad leaves mixed forest to evergreen broad leaves forest with large variation among communities; the species richness, species diversity index and evenness of plant communities in different growth form all were in the following order: shrub layer>tree stratum. Phyllostachy heterocycla cv. pubescens community as an important vegetation, its species diversity in shrub layer was higher than that in other three communities; species diversity in tree stratum was obviously lower than that in other three communities, because of Phyllostachy heterocycla cv.Pubescens asexual propagation and its dominance in community. Related Articles | Metrics Cited: Baidu(113) Select COMPARISON OF METHODS FOR STUDYING STABILITY OF FOREST COMMUNITY Zheng Yuanrun Scientia Silvae Sinicae    2000, 36 (5): 28-32.   DOI: 10.11707/j.1001-7488.20000513 Abstract （724）   HTML    PDF （490KB）（958）       Knowledge map    Save It is well known that human's living depends on plant communities, so it is very important to inquire into methods for studying plant communities stability not only in the theory but also in the practice. Based on the results of modeling community succession and comparative analysis, we proposed a method and improved M.Godron's method for studying community stability in this paper. As a sample,Daqinggou forest plant community was used to test efficiency of the above two methods.The results achieved by the two methods were similar,which showed they were suitable to study community stability,and their results could be verified each other.The Godron's method could only provide information whether community was stable, the other method combined community succession model with comparative analysis could indicate whether community was stable and what the community succession orientation and tendency were. It was effective to study community stability and useful for us to understand dynamic process of communities. Related Articles | Metrics Cited: Baidu(110) Select Study on Planting Density Effects for Masson Pine Plantation Chen Honghui;Ding Guijie Scientia Silvae Sinicae    2004, 40 (1): 92-98.   DOI: 10.11707/j.1001-7488.20040115 Abstract （809）   HTML    PDF （161KB）（888）       Knowledge map    Save The effects of planting density on growth and economic benefit of Masson Pine plantation were analyzed by using the data obtained year by year during 11 years from the experiment stand (including treatments of A,B,C,D, their planting density is 1 667, 3 333, 5 000, 6 667 trees5hm -2 respectively), the results showed that it had significant effects on stand growth, stand structure and mill run. With the increase of planting density, diameter at breast height(DBH), single tree volume, crown diameter, ratio of crown length to tree height decreased, but growing stock, tree height/DBH, self_thinning intensity increased, stand total mill run, trees percentage of small logs and mill run of small timber increased, and first thinning time was earlier. The planting density had no significant effect on tree height. Mill run of C and D was more 34.0%, 43.0% than that of A respectively. By a synthetic analysis of mill run, the cost of production and output value, planting density of cultivating short rotation industry timber could be determined as 3 333～5 000 trees5hm-2-2,/SUP. Related Articles | Metrics Cited: Baidu(109) Select THE RESEARCH AND DEVELOPMENT OF URBAN FORESTRY Mulin Wang Scientia Silvae Sinicae    1995, 31 (5): 460-466.   Abstract （642）   HTML （7）    PDF （512KB）（664）       Knowledge map    Save Urban forestry, developed from the fusion of forestry and landscape architecture, is an industry of setting up and managing urban forest ecosystem, which builds, manages and utilizes the biocenose—mainly the trees, and the facilities in cities. Urban forestry ecosystem is a subsystem under the urban compound ecosystem, which broadly participates in the use of substance and energy of the urban compound ecosystem, the coordinative development of society and nature, and the self-balanceing of the system.Urban foresty is a science of studying urban forestry ecosystem, construction, management and utilization of urban forest. The tasks of this science are those of making plannes, designs for urban forestry, studying utilization and effects of urban forestry, providing relative basis for legislation, constructing kinds of forest types, plant communities and landscapes, and selecting and producing plant materials. Reference | Related Articles | Metrics Cited: Baidu(109) Select STUDIES ON SOIL PHYSICAL AND CHEMICAL PROPERTIES AND ENZYME ACTIVITIES OF DIFFERENT MANGROVE COMMUNITIES IN YINGLUO BAY OF GUANGXI He Bin;Wen Yuanguang;Yuan Xia;Liang Hongwen;Liu Shirong Scientia Silvae Sinicae    2002, 38 (2): 21-26.   DOI: 10.11707/j.1001-7488.20020205 Abstract （827）   HTML    PDF （157KB）（933）       Knowledge map    Save This paper deals mainly with the properties of the soil of the mangrove in Yingluo Bay Natural Reserve of Guangxi. The results showed that the soil physical and chemical properties and enzyme activities differed obviously between five mangrove communities in Yingluo Bay. The contents of soil silt, clay, organic matter, total N, total P, hydrolyzable N, available P and total salt were in the order of Bruguiera gymnorrhiza community > Rhizophora stylosa community > Kandelia candel community > Aegiceras corniculaturn community > Avicennia marina community. The hydrodase activities of invertase, protease,urease and acid-phosphatase and oxido-xeductase activity of catalese in soils were in the order of R.stylosa community> B.gymnorrhiza community> K.candel community> A.corniculaturn community> A.marina community, but polyphondel oxidase in soil was at the contrary. The contents of nutrient factor and enzyme activities (except catalase) in soils were decreased with increasing soil depth. Enzyme activities in soil were closed related to soil fertilities. There are also correlation among different enzyme activities. So enzyme activity could be used as an index for evaluation of tidal flat soil fertility. Related Articles | Metrics Cited: Baidu(108) Select ANALYSIS AND EVALUATION OF SOIL WATER CONDITIONS OF PROTECTIVE FOREST ECOSYSTEM IN LOESS AREA Xinxiao Yu,Jianjun Zhang,Jinzhao Zhu Scientia Silvae Sinicae    1996, 32 (4): 289-297.   Abstract （755）   HTML （6）    PDF （502KB）（519）       Knowledge map    Save For analysing and evaluating the soil water features, the periodical soil water measurement and stand investigation were carried out during 1988—1992 in the experimental station of Beijing Forestry University, Ji County, Shanxi Province. The results showed that according to the vertical soil water variation, the soil profile could be divided into three layers, i. e. weak utilization layer, utilization layer and regulatinglayer, and according to the seasonal soil water veriation, the calendar year of soil water condition could be divided into four periods, i. e. consuming period, accumulating period, lowering period and stable period. From the study of soil water effectiveness, it is shown that eddectiveness of northern slope is better than that of southern slope, effectiveness of bare and shrub land is better than that of forest land. A multiple regression equation is proposed to present the relationship between soil water content, frequency of noneffective water and verious stand description factors of black locust and Chinese pine plantation. Table and Figures | Reference | Related Articles | Metrics Cited: Baidu(108) Select Forest Biomass Estimation Methods and Their Prospects Luo Yunjian;Zhang Xiaoquan;Wang Xiaoke;Zhu Jianhua;Hou Zhenhong;Zhang Zhijun Scientia Silvae Sinicae    2009, 12 (8): 129-134.   DOI: 10.11707/j.1001-7488.20090823 Abstract （2414）   HTML    PDF （1365KB）（2138）       Knowledge map    Save Two widely accepted methods for forest biomass estimation (I.e. biomass function and biomass factors) were summarized and analyzed， where biomass function includes biomass allometric equation and biomass-volume model. Based on these analyses， the prospect in forest biomass estimation in China was proposed： 1) collection and comprehensive studies of empirical biomass allometric equations； 2) definitions， rules and uncertainties of estimation of biomass factors； 3) development of a biomass estimation system that integrates the frequently used methods and 3S technologies. Related Articles | Metrics Cited: Baidu(106) Select Research on Evaluation of the Aeroanion in Forestry Recreational Areas Shi Qiang;Shu Huifang;Zhong Linsheng;Wu Chucai Scientia Silvae Sinicae    2004, 40 (1): 36-40.   DOI: 10.11707/j.1001-7488.20040106 Abstract （1331）   HTML    PDF （129KB）（1063）       Knowledge map    Save Based on the summarization of the former aeronion assessment models, the article put forward the concept of aeroanion coefficient, established the assessment models of aeroanion coefficient(p) and forest aeroion(FCI). Besides, after analyzing the data of aeroanion concentration observed in 10 forestry recreational areas through the method of standard normal logarithm transformation, the article set up the standard grades of forest aeroion(SGFA) and evaluating index standard grades of forest aeroion(EISGFA). The values of SGFA(with the unit of entries·cm-3), p and EISGFA were divided into six grades, respectively, >3 000,2 000～3 000,1 500～2 000,1 000～1 500, 400～1 000, <400; >0.8,0.7～0.8,0.6～0.7,0.5～0.6,0.4～0.5,<0.4 and >2.4,1.4～2.4,0.9～1.4,0.5～0.9,0.16～0.5,<0.16 respectively。According to the biological effect of aeroanion to the body of human being, this article divided the value spectrum of SGFA into three sections, respectively, critical section (<400), allowable section (400～1 000) and hygienical section (>1 000). With the using of the standards and the indexes, the aeroanion status of the main sightseeing areas of Zhangjiajie Forestry Park was successfully evaluated. Related Articles | Metrics Cited: Baidu(105)