Castanopsis hystrix is one of the important species of south subtropical evergreen broad-leaved forest in Fujian Province.With the method of spatial series substituting for time series,its population structure was analyzed in Daoshi mountain and the results showed that growing and declining type of population structure existed.The study on spatial distribution pattern by using five aggregate indices indicated that the type of distribution pattern was random,and further analysis with Iwao's M^*-X regression suggested that the basic component of distribution was individual.Population dynamics analysis showed the spatial distribution pattern changed from aggregate type to random type during the course of population growth.

This paper deals with the geographical variations in DBH and the height of young bamboos for phyllostachys heterocycla cv. pubescens in two-dimension of latitude and longitude, which was analyzed by trendface,through measuring the growth characters including height,diameter and the quantity of young bamboos from different provenances for five years.The mother bamboos collected from eight provinces in which Phyllostachy heterocycla cv.Pubescens distribute, 16 provenances were divided into northern zone,middle zone and southern zone.The provenance tests were carried out in Jianou city and Huaan county,Fujian province.The results showed that there was an obvious geographical variation trend in the DBH of new bamboo,average number of bamboo shoot and the quantity of new bamboos.

By using principle component analysis , multi-properties of 16 provenances of Phyllostachys heterocycla cv.pubescens, such as the output and quality of fresh shouting, the DBH of new bamboo, total weight and anti-pest ability, were evaluated synthetic ally. As a result, 4 good provenances were selected out, which were Wuyi, Jian'ou and Shaxian in Fujian Province and Shangyao in Jiangxi Province. For the selected provenances, the weight of fresh shooting was 17.21%～15.42% larger than the mean weight of community, the average toner of contents of 8 necessary amino acids was 15.01%, and the index of diseases was 24.93%～63.37% lower than the mean.

This paper deals with a selection of 21 potential multi-purpose associated tree species for Chinese fir from the aspects of economic profit, ecological profit, and feasibility by using analytic hierachy process. The result showed that the species were Pinus massoniana, Castanopsis fargesii,Phyllostachys heterocycla, Schima superba, Castanopsis sclerophylla, Castanopsis lamontii var.Shanghangensis, Vernicia fordii. It is presented a new approach to selecting a multi-purpose associated tree species.

A study was carried out to determine amount, composition and seasonal dynamics of litterfall in mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum and in pure stand of Cunninghamia lanceolata at 27 years old. Annual litterfall was up to 5.942 t·hm^-2 in mixed stand, slightly higher than that in pure stand, of which 70.8% and 18.28% were occupied by Cunninghamia lanceolata and Tsoongiodendron odorum, respectively. The proportion of leaf litter to total litterfall of Tsoongiodendron odorum was 82.78%, 21.8% higher than that of Cunninghamia lanceolata. Monthly litterfall of both mixed stand and pure stand peaked in March, August and December, with the highest in March, and the seasonal change patterns of litterfall in both stands were in the order of spring>winter>summer>autum.

Studies on biomass, net productivity and annual turnover rate of fine roots in mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum and in pure stand of Cunninghamia lanceolata at 27 years old were carried out. The existing amount of living fine roots in both stands were up to 3.872 and 3.315 t·hm^-2, and their seasonal changes showed two peaks in March and September, and those of dead fine roots amounted to 1.509 and 1.269 t·hm^-2, being lowest in May or March. The net productivity of fine roots in both stands totaled to 4.124 and 3 528 t·hm^-2a^-1, accounted for 22.9% and 20.9% of total net primary productivity of community, respectively. In both stands, annual mortality of fine roots were 2.119 and 1.894 t·hm^-2, respectively, amounted 31.4% and 27.8% of annual aboveground litterfall. Annual turnover rate of fine roots was 1.07 in mixed stand and 1.06 in pure stand, which decreased successively from Tsoongiodendron odorum, Cunninghamia lanceolata in mixed forest to the pure stand, and that of undergrowth were higher than that of tree stralum in both stands. It was concluded that annual turnover of fine roots was an important way for organic matter in communities returning to forest floor.

Ultra-drying Chinese-fir, pine and Casuarina equisetifolia seeds had higher vigor after one-year-storage in ambient temperature. When Chinese-fir seed MC was between 4 percent and 5 percent , pine seeds MC was 5 percent and Casuarina equisetifolia seeds MC was 1 percent ,its higher viability and vigor could be retained, its cell membrane integrity remained well and the activity of dehydrogenase, α-Amylase and respiration intensity were highest. So ultra-dry could improve the storability of Chinese-fir, pine and Casuarina equisetifolia seeds.

Based on the analysis of stand of productive and high-quality Chinese fir plantation and the indexes of technology and economy concerned,the paper analyzed the dynamic economic effect of productive and high-quality Chinese fir plantation,expounded the influence of unit-yield,timber price and wage variation on the rate of return on invested capital by employing variable cost of timber production which related with volume,tree-high as well as diameter,and measured forest economic maturity,which supplied reliant bases for confirming the age of major harvest and the cultural object of the productive and high-quality Chinese fir plantation.

The paper established a diagnosis distinguishing system by synthetic indices using distinguishing analysis method firstly, and used this method to diagnose the nutrient situation of Castanea henryi plantation in different yield types based on the measuring and analysis of five main nutrient elements in leaves. There were different correct distinguishing rates in different type dividing method by using distinguishing analysis of one dimension, which were 100% both for high yield type and middle yield + low-yield type while being 88.33% and 86.67% for high yield + middle-yield type and low-yield type respectively when dividing into two types. When dividing into three type (high, middle and low yield), their correct distinguishing rates were 100%, 86.70% and 83.33% respectively by using distinguishing analysis of one dimension but were 100%, 100% and 83.33% respectively by using distinguishing analysis of two dimensions. So, type dividing and dimensions of distinguishing function are two important factors affecting the results of distinguishing diagnosis analysis.

Experiment of fertilizer had been carried out by using simplex core design and models of relationship between composition of fertilizers and yield had been obtained. The result indicated among seven treatments, the fertilizer formula and which was consisted of urea (containing N 46%) 0.3, calcium superphosphate(containing P₂O₅ 20%)0.6 and chloride potassium(containing K₂O 60%) 0.1 had the highest yield. The mean yield of fruit reached to 5.9146 kg·tree^-1 at 8-year-old which was higher 78.35 % than that in contrast treatment. The genetic algorithms had been used to achieved an optimal composition, which in theory contained urea 0.3, calcium superphosphate 0.59999961 and chloride potassium 0.1000038, and which was closest to the best production from real experiments. After fertilization, there were obvious difference in several main physiological indexes between this treatment and the contrast treatment, suggesting that the influences of various fertilizer compositions on yields were related with physiological metabolism. This study provided a basis for fertilization management of Castanea henryi plantation.

Spraying the leaves surfaces of Camellia oleifera with different concentration sodium bisulfite.The results indicated that 150～250 mg·L^-1 NaHSO₃ could inhibit photorespiration, promote net photosynthesis and increase economic yield.This coincides at same time with a series of changes of glycolate oxygenase activity and glycolate content related to photorespiration.NaHSO₃ on SOD activity and CAT activity and MDA content of Camellia oleifera leaves is no significant differences than the control.NaHSO₃ will not injure a cell of Camellia oleifera leaves.

Pinus massoniana is a main has planting species in south of China which accounts for a large proportion among plantations, but its problem of density control has always not been solved very well. In this paper based on density control model of P. massoniana plantation established by dynamic programming, Genetic Algorithm was applied to select optimal decision in determining thinning age, optimal density and cutting age during stand management, which was on the basis of the density effect model, took the stand density as objective function and maximal present net worth (PNW) as standard. The density optimal projection of P. massoniana plantation during its management showed that combination of Genetic Algorithm and method of economic evaluation obtained satisfactory results. The optimized results showed that two times were optimal for thinning of P. massoniana plantation during its management where the site index was 10～18. The first time for thinning was in 11～12 years, the second time was in 16～17 years, the optimal time for final cutting was in 22～25 years. And P. massoniana plantation in each site index had its own optimizing management projection by which the highest PNW could be achieved, and IRR was more than 12%. So the results of this study will provide a theoretical reference for density management of P. massoniana plantation.

The models of forest self thinning are generally nonlinear and dynamic. The artificial neural network has the characteristic of expressing arbitrary nonlinear mapping, which provides theoritic feasibility for modeling forest self-thinning law. Based on the principle and algorithms of the neural network model based modified simplex method (BP-MSM mixed algorithms), this paper analyzed the effect of BP-MSM mixed algorithms and Zhang's model for modeling forest self thinning further. The comparisons in forest self-thinning of Populus tremula var. davidiana forest, Pinus yunnanensis forest and Cunninghamia lanceolata forest illustrated that the simulated effect of BP-MSM mixed algorithms were superior to Zhang's model significently when establishing network structure of 1∶5∶1 by three layers. The results of forest self thinning examples showed the surplus square of BP-MSM mixed algorithms were only 3.89%～27.16% of Zhang's model, which were satisfactory and its precision were higher. This study will enrich the simulating method of forest self-thinning, but the network structure of BP-MSM mixed algorithms is important by choosing the numbers of concealing layer and neural points.

The model of density variation during the self-thinning process for maximal density stand and general density stand was reduced by using Korf growth equation according to the growth model of biomass of plants population and maximal density,and it was proved that the self thinning model proposed in the article had more accuracy and practicability and could be used in simulating stand density development of various natural growth.

The phenylalanine ammonialyase (PAL) speciaific activity in the healthy bark of Castanea henryi were not relative to the variety resistance, the PAL specific activity all increased in the different resistant varieties after inoculation, at 144hr the PAL specific activity in the resistant varieties were higher than that in the susceptible ones after inoculation. The contents of lignin in the resistant varieties were all higher than that in the susceptible ones before and after inoculation. The contents of chlorogenic acid in Castanea henryi were not relative to the resistance to the blight. So, the PAL specific activity after inoculation in bark could be used as the criterion to evaluate the disease resistance.

The relations between gradients of undergrowth plant coverage and biomass and soil fertility have been studied in 29 year-old different density Chinese fir plantation.The results showed that the mean height, total coverage and biomass of undergrowth plant in 29 year-old Chinese fir plantation obviously decrease with the increase of forest stand density;soil moisture and pore properties are certainly improved by undergrowth plant,but the content of organic matter, total nitrogen, total phosphorous, available nitrogen and available phosphorous basically increase with the increase of coverage of undergrowth plant in 0～20 cm and 20～40 cm, and more obvious in 0～20 cm,It shows that undergrowth plant can promote to richen nutritional elements in topsoil. Therefore protection and restoration of undergrowth plant have important significance to conservation of soil fertility in Chinese fir plantation.

The biomass of undergrowth plant in Chinese fir plantation stands at different site indices and forest age was studied.The results showed that total biomass of undergrowth plant and biomass of shrub layer were basically increasing with forest age except poor growth of undergrowth plant in middle-aged forest, but the variation of herb layer biomass was more complicated. The accumulation quantity of litter of Chinese fir forest and its undergrowth plant at different site indices and forest ages also existed obvious difference. The accumulation quantity of Chinese fir litter was increasing with forest age, the litter quantity of undergrowth plant at 14 site indices was increasing with forest age, but at 16 and 18 site indices, the litter quantity of undergrowth plant was also increasing with forest age except in middle-aged plantation.Through the analysis of quantitative modelⅠ,the results showed that forest stand density, forest age,topography and soil conditions were important factors affecting biomass of undersgrowth plant, Chinese fir litter and undergrowth plant litter,especially forest stand density and forest age.

The effects of the different artificial disturbances on the flora of tree layer and species diversity in the restoration series (CK,the natural Castanopsis carlesii forest; class A,the regeneration by selected cutting;class B,the natural regeneration in clear-cutting;area C,the artificial measures promoting regeneration and class D,Chinese fir stand) of the C.carlessi forest in Wuping, Fujian were studied. The results showed that the C. carlesii was the dominant species in the tree layer in CK, class A and class B;and the second dominant species in class C. The intolerant tree species C.fissa was the most dominant species in class C, and Chinese fir was the absolutely dominant in class D influenced by artificial plantation. Numbers of families,geneus and species; numbers of species in families, numbers of genera in families and numbers of species in genera were increased to B or C class and then dropped down gradually of directly with the increasing of disturbance intensities, while the indices of species diversity and the evenness decreased, the dominant index increased linearly. In class D, the indices were very different from those of natural C.carlesii forest because the dominant species-Chinese fir, which affected the characters and environment of the community. The regeneration patterns except class D will be succeed back to the climax community of C.carlesii.

The species composition, importance values of tree population, species diversity and spatial structure of evergreen broad leaved forest community in Bijia mountain of Longyan, Fujian, were analysed. The community is composed of 186 species belonging to 75 families and 132 genera, and the community of richer plant species contains multiple dominance populations. The horizontal spatial pattern of 8 dominance populations conform to aggregated distribution. The tree layer can be divided into multiple layers in terms of height. The species diversity indexes of the second sub layer of tree layer are biggest in the five layers of community vertical structure, except species richness. The species richness and diversity index of herb layer are the second, and the community evenness is the third. The species richness of shrub layer is the first, and the community evenness is the smallest. The species diversity indexes of the first sub layer of tree layer, except the community evenness is the second, are the smallest. The diversity indexes of vine are the third or the fourth. The result also shows that the values of the Simpson's index and the interspecific encounter probability are almost equal in the community.

DRIS diagnosis method was used to diagnose the nutrient status of Castanea henryi plantation, based on the analyzing five nutrient elements in leaves of Castanea henryi plantations at 8 years old. Castanea henryi plantations stand were divided into three types according to the difference in real stand yield. The results showed that DRIS method could distinguish the balance state of the various elements and to determine the sequences of fertilizing, by considering the yield of each type stand and their nutrient content in leaves. When the high yield type stand was regarded as optimal value, the diagnosing results were that N element in middle-yield type stand was high but K element was low relatively; contents of N and P element in low-yield type stand was low obviously, so they had to be compensated.

The differences in growth process of Chinese fir between Chinese fir-Tsoongiodendron odorun mixed plantation and pure Chinese fir plantation were studied. The height increment of Chinese fir in the mixed plantation was similar to that in the pure Chinese fir plantation before age 10. The height increment of Chinese fir in the mixed plantation was always greater than that in the pure Chinese fir plantation from age 10 to age 27. As the Chinese fir in the mixed forest took the predominant status over the Tsoongiodendron odorun, its DBH and volume increment were always greater than those of Chinese fir in pure Chinese fir plantation. Competitions among Chinese fir trees in the pure Chinese fir plantation were intense from age 4 to age 11.

Based on the measurement of biomass and productivity, the caloric value of plant samples, the standing crop of energy, net energy production and energy conversing efficiency of mixed forest composed of P.massoniana and shrubs were determined. The caloric values in the mixed forest were in the order of trees>shrubs>herbs>mosses. The standing crop of energy in the mixed forest was up to 258900.8kJ·m^-2, being 156.1 times higher than that in the control (wasteland). Just being composed of trees and herbs, the plant community on control wasteland has a poor radiation capture efficiency and caused big difference in temperature between day and night, and soil draught in a long period, which are harmful to ecological recovery. The yearly retention, return and net production of energy in the mixed forest amounted to 27092.03, 5825.01and 32917.04kJ.m^-2a^-1, respectively, and were 59.6, 128.7 and 65.9 times higher than that on wasteland, separately. To the photosynthetic active radiation on the stand, the energy conversing on efficiency was 1.55%. It was concludedd that the energy productivity in the mixed stand was recovered to some extent.

By using different moisture content (MC), freezing and thawing methods, conservation materials of two tree spices, Castanopsis carlesii and C. kawakamii, were immersed in liquid nitrogen and then their germination, conductivity, SOD activity and MDA content were traced to measured. The results showed that in cryopreservation process, MC control was the main and firstly factor, and secondly were proper freezing methods and thawing methods. The optimal MC of both C. carlesii seeds and excised embryos were 12%MC, and MF-QT methods. Optimal MC of C. kawakamii seeds was15%MC, but of its excised embryos was properly down to 12%MC, MF-QT methods.

The net primary productivities of a mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum and a pure stand of C. lanceolata were measured. Annual net biomass increment was up to 9.899 t·hm^-2a^-1 in mixed stand, amounts 1.15 times higher than that in the pure stand. Annual litterfall production was 6.759 t·hm^-2 in mixed stand and 6.804 t·hm^-2 in pure stand, and the amount of litterfall from tree stratum in mixed forest was 1.05 times as compared with pure forest but from undergrowth in pure stand was 1.39 times as compared to the mixed forest. Annual return from fine roots litter was 35.66% and 33.42% of aboveground litterfall in mixed stand and pure stand, respectively, of which fine roots of trees accounted for over 80%. Of annual litterfall from <2 mm fine roots associated with C.lanceolata and T.odorum, <0.5 mm roots occupied over 60%. The net primary productivity of mixed stand totaled to 18.003 t·hm^-2a^-1, which was 1.09 times as much as that of pure stand, of which the net primary productivity of tree stratum was 1. 19 times as much as that in pure stand, but of undergrowth was 1.44 times in pure stand compared with mixed forest. In pure stand, the loss of net production in tree stratum cannot be compensated for by the increase in undergrowth. It was concluded that a more reasonable community structure was related to a higher net productivity.

Through analyzing the various position leaves character of 3 ages bamboo, including net photosynthetic rate, light respiratory rate, dark respiratory rate, CO₂ compensation point and light compensation point, in five-years-old forest during different growing shoot stages in stated-own forestry farm of Nanjin, results showed that leaves had vigorous physiological function during prosperity stage of growing shoot. Net photosynthetic rate was higher, light respiratory rate, dark respiratory rate, CO₂ compensation point and light compensation point were lower, the photosynthetic coefficients was larger.2-year bamboo and 3-year bamboo had stronger photosynthetic ability.Different photosynthetic and respiratory indexes of various position leaves were not consistent, but in generally, middle leaf had stronger assimilation ability.

In this paper,the root system and their associated effect of mixed forest of Cunninghamia lanceolata and Sassafras tsumu at eight-year-old were investigated and analyzed.The results showed that Sassafras tsumu might play a important role in improving the root system of Cunninghamia lanceolata growth due to the single root weight of Cunninghamia lanceolata in mixed forest of Cunninghamia lanceolata and Sassafras tsumu was evidently more than that of Cunninghamia lanceolata in pure forest,and that there were different mixed effects in mixed forest of Cunninghamia lanceolata and Sassafras tsumu in different slope situation,which meant that the associated effect was better in higher slope situation than in lower slope situation,and which reflected in the effect of Sassafras tsumu to the height and D.B.H. growth of Cunninghamia lanceolata. This study indicated that the associated effect was positively related to the effect of roots system.

Based on the investigation and analysis in 25-year-old Cinnamomum cassia Presl,the relative chief value was defined,both the criteria and method of multi-characters selection was put forward. In the meanwhile,plus tree was classified according to them. The selection results were analysed and discussed.

Under scanning electron microscope, the cell of leaves of five samples of Phyllostachys heterocycla cv.pubescens in different ayes was observed, into the base of whose culms nutrient solution was injeited one year before. It was found that the stomatal density, size and degree of opening had increased greatly as compared with CK. It was useful for transpiration, raising the suction and assimilation of CO₂, enhancing the photosynthesis and respiration, increasing the metabolism and accumulating organic matter. It helped to improve yield of bamboo.

The silvicultural, chemical and biological measures were employed respectively to control the larva of Kumasia kumaso (Sugi) of Acidosasa edulis.:The silvicultural measures mainly included weeding & deeply burying, weeding combined with burning , weeding & deeply burying combined with DDVP.And the biological measures included spraying with two kinds of B.t (made respectively in Jianou and Fuqing),Bacillust huringiensis(16000IU/mg), AcNPV etc.And the chemical measures included spraying with 80% DDVP E.C, 40% Omethoate E.C, Shachongguang or Lindane 1∶500× and 1∶1000× in 1999, and 17 5%Imidan E.C, 5%Cypermethrin E.C, 20%Fenpropathrin E.C, 20%Baibusi E.C 1∶800× and 1∶1500× in 2000. the results showed as follow: 1.In silvicultural measures, different treatments have no remarkable influence on the experiment results, but it can improve the hygienic condition. 2.In biological measures , different treatments have no remarkable influence on the experiment results. 3.In chemical measures, 1∶500 of Lindane was adapted to eliminate the larva in the mother shoots with the death ratio amounting to 91 10% What'smore, 20%Fenpropathrin E.C 1∶800×, 5%Cypermethrin E.C 1∶800×, 20%Baibusi E.C 1∶800× are also adapted to generalize in forestry with the death ratio amounting to 92 09%, 76 81%,75 74%respectively.

Castanopsis carlesii forest is one of the main broadleaved forest types in Fujian Province.The study on the structural features of its community showed that the community is dominated by Theaceae and Fagaceae families and the dominant tree are Castanopsis carlesii,Castanopsis fordii, Castanopsis fargesii and Schimu supereba. The community was stable relatively, and lay in a vigorous growing period. Shannon Wiener index was between 2.5 to 5.0. Shannon Wiener evenness index was between 0.6 to 0.87. The overall association of all the pecies were observed to hane nonsignificant positive association. The suggestious for its protection and exploitation were put forward in this paper.

strains of Metarrhizium anisopliae and Metarrhizium guizhouense were cultivated in submerged culture with magnetized water, and the biomagnetic effects of magnetized water on submerged sporulation of Metarrhizium anisopliae and Metarrhizium guizhouense were preliminarily studied. The results indicated that the magnetized water affected the production of submerged conidia. The output of submerged conidia were increased significantly in proper magnetized water medium. In addition, the infectivity of submerged conidia of M337 strain was tested in laboratory. The test showed that there were no significant differences in the toxicity to the 3rd～4th instar larvae of Dendrolimus punctatus between Submerged conidia harvested from medium of magnetized water and those from medium of non-magnetized water. It is hoped that the results may be used as the basis for the study on large scale of submerged conidia of Metarrhizium anisopliae and Metarrhizium guizhouense cultivated by magnetized water.

The wilt disease of Bambusa ventricosa was a serious disease occured in Nanping city, Fujian Province. The symptoms of the disease, identification, inoculation, biological characteristics of the causal organism and bionomics of the wilt disease were studied. The species was identified as Nectria ditissima Tul. at sexual phase, and as Fusarium semitectum Berk. & Rav. at anamorphic state. The causal organism of wilt disease grew vigorously on the PSA and PSA+10% decoction of culm media, and formed white coloured colonies. After incubation of 7 days at 28℃, a great amount of macroconidia was produced, no stroma and perithecia were formed after 30 days. The stroma and ascospore were only produced under natural condition. The preference temperature for mycelia growth was between 25～28℃, and the optimum pH values was at 6～7. The optimum temperature for conidia and ascospores germination was between 25～28℃, and the optimum pH values was at 6～7. The high relative humidity (RH 96.1%～100%) was necessary for the germination of conidia and ascospores. The results of experiments showed that the pathogen of the wilt disease overwintered on the soil, and disseminated by winds and rains to infect the wounded stem base of Bambusa ventricosa. The primary infection occurred from the last ten days of February or the first days of March. The peak infection occurred from the first ten days of March to the second ten days of April during early summer rains. The infection ceased from the second ten days or the last ten days of May. The freeze injury was possibly important factor to induce infection of the wilt disease.

Hegyi's competition index model for individual tree was introduced to study intraspecific and interspecific competition for dominant population of evergreen broad-leaved forest in Bijia Mountain of Longyan, Fujian. The results show that the competition is more intense in intraspecies than in interspecies, which indicated indirectly that the horizontal spatial pattern of dominant populations conform to aggregated distribution. There existed difference in interspecific competitions, and the competitions can be divided into four groups according to the competition index. Relationship between the competition index and the base diameter of objective tree conformed closely to power function, and competition intensity reduced with the growth in base diameter of objective tree.

The principles and steps of osculating value methods were introduced and the feasibleness and superiority were testified by two examples in this paper.Furthermore,the benefits of economic,ecological,growth of Cunninghamia lanceolata and social of six different interplanting patterns: Cunninghamia lanceolata—Litsea cubeba,Cunninghamia lanceolata—Litsea cuba—soybean,Cunninghamia lanceolata—Litsea cuba—tobacco,Cunninghamia lanceolata—Aleurites fordii,Cunninghamia lanceolata—Aleurites fordii—Mesona chinensis and pure Cunninghamia lanceolata were comprehensively evaluated by the methods of osculating value.The results showed that the Cunninghamia lanceolata—Aleurites fordii—Mesona chinensis had the best comprehensive benefits and the Cunninghamia lanceolata—Litsea cubeba was the second in the six different interplanting patterns.The osculating value methods was a good mult-objective comprehensive methods which not only simple and convenient,but also effective and practical,and it worthy being further popularized and applied in the research field of forestry.

Using the data obtained from sample plots of Phyllostachys pubescens, the dynamic model of energy flow of Phyllostachys pubescens ecosystem was built in this paper.Based on the model,the analysis of energy flow was combined organically with the methods of economical threshold, the concept of economical threshold of energy flow of Phyllostachys pubescen ecosystem (EET) was put forward,and the effect of compensation and super compensation were discussed furthermore.The results showed that the economical threshold of energy flow of Phyllostachys pubescens ecosystem were: EET_leaf=0.3133·x₃,EET_branch=0.2440·x₁(where x₁ and x₃ represent energy of leave and branches respectively) ;the effect of compensation and super compensation existed in Phyllostachys pubescens, and the compensation point and super compensation point of Phyllostachys pubescens were 31.33%,13.61% (expressed in defoliation rate)and 24.40%,11.94% (expressed in branch-cut rate)respectively.Therefor,this paper will not only enrich the study of energy ecology in the Phyllostachys pubescens ecosystem,but also provide a scientific basis for the management of Phyllostachys pubescens.

Species abundance distribution was regarded as an important measuring method of species diversity study in Castanopsis kawakamii forest.The log-series model was used to calculate,inspect and draw to illustrate the species abundance of 7 main communities by investigating species amounts of community composition types in C. kawakamii forest,which including ① C.kawakamii+Schima superba+Litsea mollifolia,② C.kawakamii+Daphniphyllum oldhamii+Schima superba,③ C.kawakamii+Quercus glandulifera+Ilex purpurea,④ C.kawakamii pure forest, ⑤Pinus massoniana+Schima superba+Elaeocarpus decipiens,⑥ C.kawakamii+Pinus massoniana+Symplocos stellaris,⑦ Castanopsis eyrei+C. kawakamii+Schima superba. The results showed that species abundance of arbor layer,shrub layer,all woody species of 7 main communities in C.kawakamii forest all obey a logarithmic series distribution.

From the analysis and simulated study on the stand structures of present the multi-stories mixed uneven-aged Pinus massoniana planted forests in Fujian, the correlationships between stand diameter distribution structure,stand stock distribution structure, tree height and DBH were obtained. Several proposals for the rational management and structure adjustment of the present forests were put forward.

The effects of human disturbance on community features of Cunninghamia lanceolata mixed forests were studied,the results showed that:1)the proportion of phanerophyes in the not burning forests were larger than in the control burning forests; 2)the species richness in the control burning forests were larger than that in not burning forests,but the species diversity and Simpson evenness in the control burning forests were lower than that in the not burning forests;3)the effect of control burning on the dominant species in tree and shrub layers of Cunninghamia lanceolata mixed forests were little, but on the herb layer was very large,which dominated by positive plant species; 4)the community structure was more complex which would increase the crown density of stand.