Based on the data observed for 2 years at Huitong Located Ecology Station, the concentrations, accumulation, distribution and biological cycling of 5 nutrient elements (N, P, K, Ca, Mg) were studied in the second rotation Chinese fir plantation at fast-growing stage. The nutrient concentration of different component was in the order as: herb> shrub> leaf> branch> bark> root> stem. The branch contained higher Ca and the bark had more K. Nutrient concentration of litter was lower than that of Chinese fir trees. This result shows that there was nutrient transferal from leaf and branch to stem when litter was produced. The total nutrient accumulation accounted for 854.65 kg·hm^-2. The fact that producing 1 tone biomass in the second generation plantation needed higher amount nutrient than that in the first generation indicates the second generation exhausts more nutrient from soil. The annual nutrient retention reached 93.13 kg·hm^-2a^-1, which was higher than that of the first generation. The nutrients absorption was up to 182.62 kg·hm^-2a^-1 and nutrient return was 89.49 kg·hm^-2a^-1, of which litter return and leaching return were 17.46,72.04 kg·hm^-2a^-1, respectively. In contrast to the first generation, the nutrient cycling mechanism of the second rotation Chinese fir is characterized by lower nutrient use efficiency, slower recycling rate and long recycling period.

Phenolic contents in soils of Chinese fir and its adjacent broad leaved stands and in different rotation generations of Chinese fir were compared by paired sample T test method. The results indicated that: 1. The concentration of volatile phenol in soils of both Chinese fir and broad leaved stands were much lower than concentrations that cause damage to plants. 2. The content of volatile phenols varied with seasons and automatically reduced so quickly that one month later the average content of the phenols reduced up to 62.1%。The higher of the content of the soil was, the more it reduced. 3. The average content of water soluble and complex phenols in the soil of the broad leaved stand was higher than that of the Chinese fir, however, no significant differences between them were found. The amount of volatile phenol in soils of Chinese fir and broad leaved stands were about the same. 4. No significant differences of water and complex phenols in soils between different rotation generations of Chinese fir were observed. The results indicated that the possibility which the phenols accumulate in soil then become a toxic factor was low.

Activities of 4 kinds of enzyme in Larix olgensis were measured in different season, and their relationship with growth were analyzed. The results showed that the activity of poroxidase and polyphenol oxidase were weak, and those of ascorbic acid oxidase and glutamate dehydrogenase were strong in the provenances growing fast; while the situations were opposite in the provenances growing slowly. The activities of 4 kinds of enzyme correlated with growth closely in L.olgensis. The results of system clustering with 3 kinds of enzyme activity in different season as variable were similar, and were indentical with that with growth properties as variable. Regressive analysis showed that the activities of poroxidase and polyphenol oxidase correlated with growth negatively in L.olgensis, while those of ascorbic acid oxidase and glutamate dehydrogenase positively. Preliminary results indicated that the 4 kinds of enzyme maybe become physiology and biochemistry indices of early provenance selection in L.olgensis.

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.

Net photosynthetic rate(P_N) and growth of seedlings in poplar, walnut, velvet ash and pagoda tree, which were cultured in moist vermiculite with a range of NaCl concentration from zero to 200 mmol/L in glasshouse, were determined. In contrast to that of pagoda tree, the survival percent of poplar ′Zhonglin－46′was the least. The survival percent of walnut was more than that of velvet ash. Dry weight and leaf total area decreased to different degree after salt treatment. It was obvious that P_N of the four tree species different responded to salinity and the responses could be categorized into three kinds. Poplar ′Zhonglin-46′and walnut were included in the first one, P_N of which much decreased immediately on the commencement of salt treatment and decreased more at higher salinity. P_N of velvet ash decreased less than the above two after salt treatment and it could tolerant salt stress about 100 mmol·L^-1 NaCl concentration for at least 14 days. While P_N of pagoda tree increased after salt treatment and it could keep its P_N not less than that of its control at not more than 200 mmol·L^-1 NaCl concentration for at least 24 days. For poplar ′Zhonglin-46′,P_N and leaf total area affected its growth of seedlings under salt stress. For walnut and velvet ash, only the leaf total area was the main reason for the decline of their growth. While P_N and leaf total area could not elucidate the decreased growth of pagoda tree under salt stress.

Measures to promote rooting of in vitro shoots were conducted with six precocious walnut cultivars which had been subcultured for 4 years. It was found that successful rooting was closely related to inducing method, duration of IBA treatments, IBA concentrations, light conditions, and developing state of the shoots. The rooting rates of 60.5%～89.7% and 2.0～3.6 roots per shoot were achieved in six cultivars by adopting tender shoot with smaller leaves and longer internodes and using the two steps method that was firstly induced on 1/4 DKW medium with IBA between 5.0 to 10.0 mg·L^-1 for 10～15 days under dark condition, then transferred to the DKW medium without IBA under light. Meanwhile, changes of IAA and ABA level in shoots were monitored during rooting inducing. The regulations and control of hormones during walnut shoot rooting was discussed in this paper. The rooted shoots have been successfully transplanted to field.

The growth of young Fraxinus mandshurica plantation on various site conditions in Mao′ershan regions was investigated by temporary sample plot method.Site factors influencing the growth of young stand were analyzed by quantity theory I.The results indicated that the main site factors influencing the growth of young plantation of Fraxinus mandshurica were position on slope,depth of soil A layer,aspect of slope,and gradient of slope successively,smong which the position on slope was the key factor.Thirty-four site types were classified according to analysis of site factors.Besides,the nutrient status of various site conditions was analyzed.The results indicated that the nutrients were not the restricted factor.

The classification system of backbone forest strip types had been put forward according to the landform type,strong or weak sea wind,microtopography,forest tree growth,forest strip structure feature and windproof efficacy by means of the typical survey of backbone forest strips for Casuarina equisetifolia in the coastal draught,the mobile observation of windproof efficacy and the serial researches of regeneration afforestation technigues on Chishan Forest Farm,Dongshan County and Chihu Forest Farm,Hui′an County both in Fujian Province since 1992.The local forest belts were classified into 9 main types and the backbone forest strip classification regeneration theory was advanced accordingly.The breakthrough of backbone forest strip classification theory research brought along the constant innovation in the forest strip regeneration modes and afforestation techniques and energetically promoted the smooth development of backbone forest strip regeneration afforestation in C.equisetifolia. In respect of forest strip regeneration modes,according to the different-type forest strip regeneration afforestation research result,the alternate strip and planting under canopy within strips and the thinning interplanting regeneration mode were put forward,as well as various key techniques,including regeneration strip width control,crown density control and thinning intensity were adopted. Based on the combinative principle of tree species adaptability,fast growth and protective function,some regeneration afforestation tree species were raised for different-type forest strips,such as Acacia crassicarpa,A.aulacocarpa,Eucalyptus ABL No.12,Pinus elliottii and C.equisetifolia excellent clones.More than 7 million plants of these excellent tree species and clones had been bred and were popularized for afforestation in the adjacent cities and counties in succession.In respect of key techniques for forest strip regeneration afforestation,the serial drought-resistant afforestation techniques of digging deep holes for site preparation,putting into the proper earth removed from other places,applying phosphoric fertilizer,mixing mud,selecting rainy days for afforestation in spring,planting deeply with big container-growing seedlings,and ridging tending for preserving the soil moisture in young forests were put forward for the poor habitat conditions of gales,drought,soil being deficient water and poor,etc.in autumn and winter,and the planting survival percent of most tree species reached 90% or so.The average height of main planting tree species of 3-year-old young forests was 3～5m,which had become closed forests and began to give full play to protection.Thus the relative wind speed within regeneration forest strips was about 10% less than that before planting.This is one of the great breakthroughs of regeneration technique researches of backbone forest strips for C.equisetifolia in the coastal draught.These techniques have been accepted and universally adopted by the local forestry productive units.

There were great differences in the growth laws of stands and productivity of forest between afforestation by water-harvesting and conventional afforestation on the Loess Plateau. The basic reason was that afforestation by water-harvesting improved the condition of soil moisture in forest owing to increase of runoff volume collected in the planting strip. 15 years old four black locust forests with different densities such as 840 stands·hm^-2, 1110 stands·hm^-2,2220 stands·hm^-2 and 3330 stands·hm^-2 built by natural slope water-harvesting, and 9 years old two forests built respectively by stamped slop water-harvesting and conventional measure were studied in this paper. The results showed that the forest density was thinner (the size of water micro catchment area was larger), the runoff ratio of water micro-catchment area was higher, and the runoff volume collected in the planting strip was more. If it was 100 percent in forest with density of 840 stands·hm^-2, the runoff volume in other forests from low to high density made respectively up 93.60, 81.77 and 84.43 percent. The annual soil moisture in the lowest density forest increased 20～25 percent more than that in one of the two highest density forests. The runoff volume collected in the planting strip in the afforestation by water-harvesting was 30 percent more than that in the conventional afforetation, and the difference of soil moisture between the two forests was about 10 percent. Because of the different water condition and dominant effect of forest density, the growth of height, DBH (diameter at breast height) and volume between different treatment forests were greatly different. Especially, the difference of total increment was the most remarkable. The growth status would be worse when the forest density was more than 1000 stands·hm^-2. The current annual increment of atands put up an annual variation law with precipitation. The maximum of the current annual increment arose in the year with highest precipitation. The maximum of the current annual increment in the highest density forest had arisen at the earlier age.

Quantitative RSIM (Remote Sensing Information Model)was improved to evaluate the desertification degrees by using the data of state produced hyperspectral resolution imagining spectrometer, and the mainly quantitative factors on desertification assessment were retrieved which including the vegetation cover, the biomass and the soil water content. For the indexes which are difficult to count, the recoding maps based on the visual interpretation are obtained and then imaged respectively to be used in the RSIM. Every pixel in image can be used to acquire the indexes of all the evaluative factors. Based on the current methods on desertification assessment, quantitative RSIM on the basis of the pixel is developed and the distributing map of desertification degree is plotted in this paper. The result shows that it is relied to retrieve quantitatively the vegetation cover, the biomass and the soil water content of the desert area by the data of hyperspectral resolution imagining spectrometer, when there are both the shrub and the grassland in the retrieved region, the precision of the polynomial model is obvious higher than that of the linear model, contrastingly when the type of the vegetations is simplification, the linear model has the higher precision but limited applied range and can only be applied in block. So the retrieval efficiency can be improved by using the polynomial model in the region having only the shrub and the grassland. The method retrieving the soil water content is suitable to the flat area with sparse vegetations, at the same time the research shows that the model based on the soil thermal inertia stands against the interference of vegetations. On the whole, the precision of the desertification assessment RSIM lies on the data acquired precision and the current methods on desertification assessment that is to say whether the appraisable indexes are rationale and scientific or not and whether the weigh and the grade criteria that the experts give are objective or not.

The branches of Broussonetia papyrifera were treated with Cynancum komalovii total alkaloids and Melia azedarach fruit extracts as the food of the beetle (Apriona germari Hope), the effects of C.komalovii total alkaloids and M.azedarach fruit extracts on their oviposition and egg hatch were investigated and compared. The testing paired beetles were put into the plastic containers with diameter of 25 cm and 25 cm in height and covered with iron screen. The experiments were carried in laboratory at the room temperature. During 15 d testing period the average egg numbers laid per d of the treated seven pairs of the beetles in the two treated groups, which were fed on branches treated by 300 μg·mL^-1 C.komalovii total alkaloids and 100 μg·mL^-1 M.azedarach fruit extracts were 3.53±4.18 and 6.73±3.82 respectively and in the control group it was 13.73±2.90. t-test showed that there were significant differences between the treated and control groups in average egg number per d. The Cynancum komalovii total alkaloids and the Melia azedarach fruit extracts affected egg hatching in A.germari, which were shown in two aspects:(1) The egg hatch rate was lowered. the final egg hatch rate in the group of 300 μg·mL^-1 C.komalovii total alkaloids and in the group of 1000 μg·mL ^-1 M.azedarach fruit extracts were 77.36%,87.12% respectively, and that in control group was 99.5%. (2) The time period needed for egg hatch was increased. In the group of 300 μg·mL^-1 C.komalovii total alkaloids, the time for egg hatch was 17d, in the group of 1000 μg·mL^-1 M.azedarach fruit extracts it was 15 d and that was 11 d in the control group.In brief, in the experiment it was shown that oviposition and egg hatch were significantly inhibited for the adults of Apriona germari, which had been fed with C.komalovii total alkaloids and M. azedarach fruit extracts. To develop new ways of behavior Manipulation for Insect Pest Management with the extracts of C.komalovii and M.azedarach were discussed with resources of the two plant species in China in the paper.

With GC-MS,the composition and relative contents of the volatiles in three kinds of leaves of Castanea mollissima BL. Were analyzed:uninfested leaves, infested leaves with Oligonychus ununguis, and infected leaves without the mites. Caryophyllene and Alpha-fanesene were of large proportion in all the three kinds of leaves. Peak of the Caryophyllene was higher in the infested leaves, while that of the Alpha-fanesene was higher in the infested leaves without mites. 1-octene was not found in the uninfested leaves, but was found of high content in the infested leaves, and the peak of it in these leaves with mites was higher significantly than in those without mites. Peak of Benzoic acid ethyl ester in the infested leaves with mites was higher significantly than in the other two kinds of leaves. Content of 1,6,10-doclecatrien-3-ol, 3,7,11-trimethyl was highest in the infested leaves with mites, while there were little of it in the uninfested leaves. 4-bromo-2-bentenl showed the opposite trend:the content of it in the uninfested leaves was higher significantly than in the infested leaves. It was inferred from the biological test that:having been infested, the change of the kinds and content of the volatiles changed the chemical fingerprint of the host plants' odor so that Oligonychus ununguis had difficulty in recognizing its host plants even had epellent action and migrated from the infested leaves to the uninfested leaves. At the same time, these volatiles have important inducement action in attracting Amblyseius finlandicus.

Growth adaptability differentiation in 49～55 isolates of Sphaeropsis sapinea obtained from 13 provinces in China was studied. There were growth differences in various media, six temperatures and six pH values among the isolates. It is the first report to apply a mathematical function for establishing temperature and pH growth curve (0～72 h) to compare their optimum values and differences in the isolates of S. sapinea in China. The average optimum growth temperature of all isolates was 26.8℃ , and that of isolate ZJ2 was the lowest (23.1℃), the isolate F1 highest (29.6℃) . The average optimum growth pH was pH 5.6 ,and the isolate F7 lowest (pH 4.4), the isolate F5 highest (pH 6.7). Different geographic regions may have some effects on adaptation of isolates to temperature , but no obviously effect on adaptation to pH.

A detailed investigation on jujube witches' broom disease associated with phytoplasmas was conducted at different ecological sites of jujube growing areas,including Shaanxi,Henan,Shanxi,Anhui,Zhejiang provinces and Beijing city.The historic and present circumstances of disease occurrence were surveyed,involving disease distribution,severity,transmission way,cultivation as well as geographic and environmental variation.It was found that the wide utilization of root-spouting seedling carrying phytoplasmas had been contributing the spread of disease in a diseased orchard and from diseased areas to disease-free ones.Several cultivars differed in resistance to the disease.Air pollution nearby the jujube orchard and improper cultivation,especially,the imbalance of fertilization,could reduce the cultivar's resistance to the phytoplasma.The phytoplasma detection by DAPI fluorescence microscopy and polymerase chain reaction (PCR) revealed that there were different proportion of symptomless infected plants (latent infection) in different infested orchards.It was assumed,therefore,that the wide use of latent infection seedlings as propagation materials and gradually deteriorating conditions for jujube growth and fruiting leaded to the prevalence of the disease in most regions.

The leaf disc of Eucalyptus urophylla was regenerated by use of the quadratic orthogonal rotation design to optimize the differentiation medium for the callus.The leaf discs of the E.urophylla were co-cultivated with Agrobacterium tumefaciens carrying the target gene.20 sprouts which resisted to the Kam were obtained after callus inducing and Kam sereening.8 out of them regenerated from the rooting medium E_3-B supplied with the same concentration of Kam can be considered as transgenic seedlings.The nopaline synthetic enzyme activity of the preliminary transformation was detected by electrophoresis.Using the anti-bacterial peptide gene labelled with γ-³²p-dCTP or DIG as probes,the introduced gene was detected in the preliminary transformations through dot blotting and Southern blotting.Innoculation of the preliminary transgenic seedlings with high virulent Pseudomonas solanacearum (991016) caused a death rate of 56.7%,30% lower than that of the control.It was demonstrated from the above results that the anti-bacterial peptide gene was integrated into the genome of Eucalyptus plant and the transgenic plant with higher resistance were obtained.

Factors and their ways affecting forest fires in Heilongjiang Province were analyzed here at a scale larger than 500?km\+2.The results indicated that the annual fire occurrence (anthropogenic fires) is direct proportional to populations engaging in forestry while the annual burned area is irrelevant to them.The spatial variance of drought index directly affects the spatial pattern of burning rates.Forest fire characters have no linear relationships with climatic factors.The response of fire occurrence and burned areas to annual averaged temperature and precipitation in the province can be concluded into two modes:one described by single leafed hyperboloid and another by dual leafed paraboloid.The cycles of forest fire characters are closely related to that of annual averaged temperature and precipitation.The effects of forest types on fire in the province are not significant.Better management significantly reduces forest fires.Fire occurrence and burned area have no linear relationships with number of fire outlooks,fire engines and communication network covers.

Moisture unsteady-state diffusion in radial and tangential directions during high temperature drying of Masson pine timber was tested and researched in this paper. The results are as follows: When moisture content above fiber saturation point (F.S.P.), the moisture diffusion coefficients of Maasson pine timber are increasing with moisture content decreasing; when moisture content below F.S.P., the moisture diffusion coefficients of Masson pine timber are decreasing with moisture content decreasing. Radial moisture diffusion coefficients are greater than tangential moisture diffusion coefficients. Moisture diffusion coefficients across grain direction increase with medium temperature increasing and humidity decreasing.

Results from the differential scanning calorimetry (DSC) analysis indicated that the reaction of NLFS-1 scavenge with formaldehyde could be measured, most of free formaldehyde in UF resin could react with the scavenge, and reacting amount would depend on molar ratio or free formaldehyde of the resin. The scavenge of 5% is high capable of catching formaldehyde in particleboard and medium density fiberboard panels with low molar ratio and without dehydration UF resins, and the formaldehyde emission value can meet European standard E1 or Chinese Standard GB-T11718-1999 Grade A. The IB values could be improved well after post isothermal treatment, but the formaldehyde emission would increase a little.

This paper studied the wood basic density, growth ring width, proportion of late wood and anatomical features for 15 years Masson pine plantations with 5 different planting densities in Longli, Guizhou province. The results show that the planting densities greatly affect the growth ring width, proportion of late wood and tracheid row through variance analysis. As planting density increased, the growth ring width and tracheid row decreased but proportion of late wood increased. Although the effect of planting density on the wood basic density is not significant, but the regularity is obvious that wood basic density increased with the increasing of planting density, but decreased if it is too closed. The effect of planting densities on tracheid form vary with age. The chang of average value of tracheid form in different planting densities is not so great, but the tendency of the tracheid length's increasing with their age will be affected by its plangting density. Its has no significant if planting density is small. The proportions of tissues is not affcted by the planting density.

Population distribution of a species in space can be generally classified two types: discrete and continuous distribution, but the genetic variation underlying this physical distribution is very complicated. How does the genetic variation partition between and within populations? How can this genetic variation be maintained in real world? Thus, knowledge of population genetic structure may help us to understand the evolutionary process of the species and assist us in decision-making on conservation of genetic resources. So far insight into population genetic structure is very restricted, and theoretical studies are mainly confined to the three classical models of genetic structure: island model (Wright,1931), stepping-stone model (Kimura,1953) and isolation by distance model (Wright,1943). The first two models can be used to address the case of discrete distribution in space, and the third one to the case of continuous distribution. Since the introduction of these three models, many limitations involved in them have been relaxed and their variants have been developed and analyzed using a variety of statistical genetic methods. In this paper, the three models and their variants and cline theory, a specific genetic structure of populations in terms of the change of genetic variation with geographical distance, were remarked in detail, including their kernel ideas, application limitations and relaxation, development, and testing of our understanding using the naturally occurring genetic markers within taxa. In the end, the author highlighted the requirement of exploring appropriate theory suitable for genetic structure of plant populations because there are many obvious differences between plant and animal population genetic structure. Firstly, vectors of gene flow in plant species are different from those in animals. Secondly, the migration rate contained in the formulae of traditional population structure models cannot be substituted linearly by seed and pollen flow if rates of seed and pollen flow are not too small, which is highly likely in many plant species. Thirdly, population genetic structures of three plant genomes with contrasting modes of inheritance are different. Fourthly, differences in population structure among three plant genomes can provide important information on estimation of seed and pollen flow, on inferring colonization history, etc.. The integration of the impacts of seed and pollen flow with the interaction between cytonuclear genes probably can gain deep insight into the genetic structure of natural plant populations.

This paper reviewed the research progress on reproductive system of seed orchard and effect of flowering phenology, gamete production, cone and seed abortion, pollination mechanism and flowering distribution on genetic composition of seeds, discussed the relation among flowering phenology, cone production and gamete contribution. The differences of flowering phenology and polination mechanism for different parents limited gene communication between parents, the differences of cone production, abortion and spatial distribution resulted in change of gamete quantities from different parents, the both affected the genetic efficiency of reproductive system on seed orchard. The systematic and further researches must be conducted on reproductive system in order to increase the genetic quality and diversity of seeds on seed orchard.

As a kind of multipurpose plant found in the forests in tropical and south subtropical regions,rattan is of great economic value and becomes an important forest product only second to wood and bamboo.In this paper,the distribution and utilization of rattan resources are summarized first;and then,a overview of rattan research and development both at home and abroad are present;finally,prospects and potential for development of rattans are discussed.

It was full accord with that both the economical and ecological benefits of forest harvesting should be given consideration to. This paper gives a comprehensive description of the studies on effects of forest harvesting operation on soil, water properties, regeneration and seedling growth. The current advances in harvesting techniques, operation machinery and methods to reduce the impacts on site for forest harvesting were also fully expounded, on the basis of which we put forward the corresponding countermeasures for the researches on environment protection technology for forest harvesting in China.

This paper analyzed in theory some common rules about the stress releasing in wood composite based on chemical thermodynamics. It primary proved the creep and relaxation would concur during the stain recovery of wood composites after thermos pressing. It told that the release of internal stress in boards is by mains of discharging Non-expansion-work energy and expansion-work energy. Only if the energy in boards system discharged by the way of Non-expansion-work, it would benefit the stability of boards system. And the study found the theoretical basis in chemical thermodynamics for the fact that hot-stacking operation will improve the dimension's stability of wood composites.

The contents of starch, fat, protein, macro-and micro-elements of Ginkgo nuts collected from 42 trees located at 13 original regions in 9 provinces were determined. The results showed that differences among regions were higher than those among individuals within region, although the variation level for all the compositions and mineral elements were lower. Therefore, at present selection and application of high-yielding genotypes was a proper strategy to genetic improvement of Ginkgo biloba. Because increase of nut yield through individual selection within population will be achieved more easily and quickly than that for nut quality improvement in a short time.

Chaitophorus populialbae is one of the principal pests on Populus alba L. and Populus tomentosa Carr, in Shanxi province. A study on pteigostium variation was conducted in 1983 on the pest. The processes of pterigostium mergence, displacement and disappearance of Chaitophorus populialbae was described. It was considered that the tendency of decrease in the number of pterigostium was one of the biological characteristics of the pest, and greatly altered with the change of temperature.

The sample plot investigation and stem analysis have been conducted so as to study the growth law of Machilus pauhoi and to analyze the relationship between its growth and the environments in Anfu county and Jian county ,Jiangxi province The results indicate that:(1) Machilus pauhoi,an indigenous tree species, grow quickly, but grow slowly in the early 5 years (2) According to average growth increment, the diameter at breast height of 50-year-old tree is 0.64 cm·a^-1, its height is 0.45m·a^-1 and its volume is 0.0169 m³·a^-1; (3) In the growth process, there are two peak growth periods for it. The peak growth periods of diameter at breast height are among the 15th～20th year and the 40th～45th year. The peak periods of height are among the 5th～15th year and the 35th～40th year, and the peak periods of tree volume are among 20th～25th and 40th～45th year. (4) The site condition has more influences on the early 20 years growth than on mid later term growth. (5) The woodland in the 300～500 m's altitude with slate forming soil, rich organic matter and slope angle under 25, is most suitable for its growth.

Choosing wood dry kiln is a decision making process, but traditional choosing method is just using simple comparison. Using the analytic hierarchy process makes the thinking process of the decision-maker become mathematics and systematism and makes the decision foundation become more acceptable and more scientific.

The research on distribution of the microorganism groups in the air of some southern china forest area indicated: In the air over forest, moulds are the most species of microorganism, but in the urban areas, Bacterias are the majority one and its amount may be 100 times more than that of forests air or rather more; The number of microorganism in waterfall location are much less than that the other location in forests air, even sometime it is difficult to find them; The amount of microorganism, especially the bacteria, in the forests area with low aeroanion are more than that with high amount of aeroanion.