The models of throughfall, stemflow and canopy interception in the condition of constant intensity were applied to variant intensity. The parameters of model were determined. The most relative errors between variant intensity experiment and model's simulation were lower than 7.3% by the example of throughfall, the results were better.

Nutrient cycling in the evergreen broad-leaved forest dominated by Cyclobalanopsis glauca was studied from 1990. In this paper, the amount of the forest floor, dynamics of carbon and eight nutrient elements in the forest floor (including three sublayers: L, F, H) and the soil (including three layers: A, E, B), and accumulating characteristics of nutrients in main plants are reported. The results show that: The amount of the forest floor is 14.141t/hm², in which H>F>L. The order of contents and amount of elements in the forest floor is C>N>Ca>Mn>K>Mg>P>Zn>Cu, and that of the soil is C>N(K)>K(N) >Mg>Mn>Ca>P>Zn>Cu. Compared with other regions, the soil in this area have higher contents of Mn and N, and lower contents of P and Ca. Varied elements' contents having different changing regularities in various layers and seasons. The contents of C, N and Ca descend with the drop of depth. The contents of K, Mg are lower in the surface. The contents of P, Cu and Zn are higher in H sublayer and A layer, and that of K, Mg are higher in deep layers. The accumulating characteristics of nutrients in plants are different among elements and layers (species). The accumulating degree of Ca is the highest, the second is N, and that of Cu and Zn is the lowest. In general, the accumulating degree of liana, herbs and understory plents is higher than that of trees and subtrees.

The inheritances and correlations between growth characters and wood quality characters were studied with the data of 25 Popuar clones, which had been growing for 7 years. The significent differences among these clones were found in fiber length, fiber width, ratio of length to width, wood specific gravity, tree height and DBH. They were moderately or intensively inherited in 6 characters of growth and wood properties. The broad heritabilities were calculated by fiber length, fiber width, ratio of length to width and wood specific gravity, tree height and DBH, which were 81.9%, 73.3%, 70.52%, 64.3%, 68.8%, 70.54% respectivly. High genetic positive correlations were found between tree height and DBH, between fiber length and ratio of length to wodth, between wood specific gravity and DBH. The effectiveness of different selection methods in descent order were index selection > direct selection > indirect selection. The selection index were suitable in this experiment, which included tree height, DBH, wood specific gravity and fiber length. 4 supper clones were selected by index selection method, which were good in both growth and wood properties.

RAPD analysis was applied to the major species in the section Tacahamac of the genus Populus, such as P. suaveolens Fisch., P. ussuriensis Kom., P. Koreana Rehd.and P. maximowiczii Henry in order to assess the degree of genetic variability between and within these species.Most of the amplification products generated from the four species using the seven primers are monomorphic, but three out of the 7 tested appeared to produce a considerable degree of polymorphism at the interspecific level and all the tested primers could produce varying extent of polymorphism at the interspecific level within all the four species.A dendrogram displaying hierarchial associations was generated using NT-SYS computer programme and more apparently revealed genetic variability between and within the four species.The result is of significance to the future improvement of these species.In addition, the resulting analysis was in broad agreement with previous classification of the species studied, confirming the validity of the method. The results showed that P. Koreana Rehd.appear as the closest relative of P. suaveolens Fish., followed by P. ussuriensis Kom. and further away, P. maximowiczii Henry.questioning the current classification, in which P. suaveolens Fisch.and P. ussuriensis Kom. share the closest relationship among the species in the section Tacahamac.

Regenerated plantlets used for forestation were induced from axillary buds culture in vitro of plus trees 5-35 years old of Larix olgensis Henry.Z and SH media supplemented with BA1.0 (mg/L, the following units are the same) and NAA0.1 were better for induction of bud differentiation, induction rate of 55% in average and 68% at the most were obtained. Z medium added with IBA0.2, NAA0.2 and Phloroglucinol 40 was better for rooting.It was observed that the basal medium takes notable effect on rooting in this experiment.The differentiation rate of explant would be increased by 25.80% with pretreatment for donor plants. Better procedure of micropropagation for larch should be as follows:selecting plus trees→pretreatment of donor plants→inoculation→inducing differentiation of bud→subculture→rooting→transplanting.

According to the features of research on the construction patterns for eco-economic protection forest system, a expert system tool and expert system for construction of eco-economic protection forest in Xin Shuihe watershed are developed in this field.Its application shows that it is very useful in the fields of theory and practice for protection forest.

The isozymes of C_x-Cellulase from the alimentary canals of 18 species of female adults, 12 species of larvae of longicorn beetles representing two sub-families(Lamiinae, Cerambycidae)were investigated with isoelectricfocusing polyacrylamide gel electrophoresis method.Difference of isoenzymes among subfamilies and tribes are more conspicuous than that among genera, there are no any similar zymogram bands possessed by subfamilies or by tribes, Certain zymogram bands possessed in common by some genera, and also among the different species of the same genus, and there are usually some specificbands existed in different species.Moreover, according to the degree of diversity or similarity of C_x-Cellulase isozymes, it would be more reasonable to restore the genera Linda, Oberea and Phytoecia into tribe Phytoecini, and the genus Paraglenca into tribe Gleneini rather than to treat them as a single tribe Saperdini as in Breuning' Revision.

Tetranychus truncatus is a mite pest of Sophora japonical in the district of Beijing.It occurs from last May to early November, with a peak harmful time from July to August.In the urban district, about 70% of the leaf was injured, and in the suburb, it was over 90%.there are 15-17 generations a year. Each generation lasts 6.7 days on an average at 28℃, RH 67%.The average life-span is 7.5 days for the males and 10.7 days for the females at 27℃, RH 72%.It overwinters as adult in the creack of trunk and limb, quite few are in the branchlet, grass and soil layer of the root. Using 25% Nivkomycin at a dilution of 1:1000, 10% Zeng xiao lui yang mei su of 1:2000, 73% propargite of 1:2000, washing powder of 1:400, pellet NH₄HCO₃ of 1:100 in spring, significant effectiveness was obtained.

The sex attractant for Chinese locust moth (Cydia trasias Meyrick), (E, E)-8, 10-dodecadien-1-ol, was synthesized via Grignard coupling reaction from two readily available starting materials containing C₆ units(scheme 1). Field trials were undertaken in Chinese locust grove in Beijing during 1993-1994. The experiments showed that (E, E)-8.10-dodecadien-1-ol gave. strong attractive activity to the male Chinese locust moths. The attractant-baited trap can be used to detect both the presence and the density of the moth in the field, which is very useful for monitoring population of the pest insect.

The strength of moltinject corner joint of case furniture was analysed by compared with that of pin dowels corner joints. The deflection of case furniture which corners were joined by various methods of corner joints were predicted in this study.

Focusing on the reality of large amount of resource comsumption, extensive management and aggrevation of forest resource crisis, the paper raised the theory for combination-allocation and demand stimulation (CADS) with the core content of combination-allocation (CA) and control of structured effectiveness and CA and utilization of resource effectiveness. This is to study the solution to contradiction between environment and development imposed on the forest resource crisis in the forestry construction and to put the transferrance from traditional forestry to sustainable forestry into operation. 10 items of policies of CADS have been discussed within the paper, which are theresource utilities theory relying on the progress of S&T to increase the resources and show down the crisis.

This paper provides a summary of the role of plant hormone in vascular differetiation. Auxin is a major factor in regulating cell differetiation of the xylem, cytokinin plays an important role of bringing meristematic initials and cells differetiation, gibberellin promotes fiber formation, an application of combining of both auxin and gibberellin can stimulate fiber differetiation of secondaxy xylem, ethylene promots the differetiation of xylem and phloem in tree. This paper discusses three major problems during wood formation. First, the level of auxin controls size and density of vessel and tracheid in xylem along the tree axis. Second, environmental factors influence cells differetiation of xylem. Third, regard with to the machine of ring-porous versus diffuse-porous wood formation in temperate deciduous hardwood trees. A new hypot-hesis was put forwarded regarding the growth regulator control of wide early-wood vessel formation in ring-porous trees and the control of narrow vessels and fibers in the latewood. This discussion is of great value in terms of improving wood productivity and quality in the future.

Under the isotropic hypothesis from horizonal view in this paper, used the conclusions that the force acts on the boundary of semi-infinite plate body of theory of elasticity and uniform load acts on the cylinder, the relative force formular about the formation of scrimber blank acted by static pressure have been derived and conclusions have been verified through tests. Applied these theories, the maximum stress when wood web of scrimber are formed and reached the critical situation can be calculated accurntely, and the intensity criterion can be established. the conclusions in this paper elso can be applied to the parameters establisment of manufacturing equipment for scrimber blank as well as rich the basic theories of wood science.

This artical reviews that successive rotation of Chinese fir results in low amount of soil bacteria, fungi and actinomyces, in different distribution of microorganism species, especially fungi, in low soil enzyme activity, in less kinds of free amino acid and in low content of free amino acid and free sugar and free phenol, in low content of soil organic nutrient and available nutrient, espcially available phosphorus, compare with first rotation of Chinese fir at Kuocang Mountain of Lishui region in Zhejiang province. The research of infrared a bsorption spectrum also shows that the composition and structure ot or ganic matter have obviously difference. The research results. open reveal the relationships of yield dicline and variation of soil structure and composition.

The new type of autodissemination, the technique of sex pheromone plus virus dispenser, was proposed. To the dispenser, which releases sex pheromone and has lnsect virus on it, males are attracted and contaminted with the virus. When the males with the virus mate with females, the virus is transfered to them and then to their eggs. Afterwards the larvae from the eggs get disease and died. The experiments in wind tunnel showed that when the males of Clania variegata flied to the sex pheromone plus virus dispenser and attempted to mate with it, they were contaminated with the nuclear polyhedrosis virus of C. variegata(CVNPV). Males contaminated with CVNPV artificially were able to pass the virus to the larvae of the next generation by mating with females in the wind tunnel and it resulted in larvae mortality at certain level. Those results demonstrated feasibility of the technique of sex pheromone plus virus dispenser in its two important steps in vertical transmisson of the virus disease.

Norbanus aiolomorphi Yang et Wang is a new parasitoid parasitizing the larvae and pupae of moso-bamboo eurytomid, Aiolomophus rhopaloides walker. It has six generations per year and overwinters as pupa or mature larva within its host galls in Hunan Province. The longevity of adult is about 10-12 days. A female can lay 3-6 eggs, one egg per host. The egg stage is 3-5 days. The larva stage and the pupa stage are 8-10 days and 5-6 days respectively, when the temperature is at 30-35℃. The temperature has greater influence upon emergence of the adults. The larva of Norbanus aiolomorphi are with its host on the vertical distribution law in the moso-bamboo trees and on the space distribution pattern in the grooves of moso-bamboo.