In this paper the function of Chinese fir plantation ecosystem in cleaning pollutants was studied. The results show many kinds of organic pollutants such as 2.3-dichloro-butane, benzene, and heavy matal elements Pb, Cd from atomsphere enter the ecosystem through rainfall. As a result of these pollutants intercepted by canopy, grund cover, forest soil while travelling in the hydrologic process, the species and the concentration of these pollutants are greatly reduced in output water. The mechanism and benefits of forest purifying water were discussed in the paper.

This paper puts forward the principle and the basis for regionalization of the protected areas in China. The principles are delimiting functional natural and near natural biome units, combining of systhetic analysis with guiding factor, adopting the hierachical regional system and serving the purpose of resources conservation and management; the bases for regionalization are climatic condition and its climax vegetation and the seasonal activities and proporties of air-mass and marine current.According to the above criteria, the terrestrial, coastal, and marine biomes of China can be classified into:1. Terrestrial biome-2 biogeographical realms-4 biome regions-82 ecosystem regions;2. Coastal biome-1 natural biotic realm-3 natural-biotic regions;3. Marine biome-1 natural biotic kingdom.Finally, conservation and management of resources in the protected areas network created under the above-mentioned regionalization system are also discussed in this paper.

The genomes of 16 clones of 2 Salix species are taken RAPD test with 12 primer. It can be seen from the electrophoretogram that primer chl-1 can distinguish the two Salix species and primer Deca-4 can distinguish the 16 clones. The dendrograms are drawn after NT-SYS analyzing DNA bands in the pattern resulted from electrophoresis of amplification products of 16 clones genome with 12 primers. The result shows the classification outcome of 2 Salix species acquired by RAPD accords with that by the traditional way.

This paper expounds the karotypic differdntiation of Fokienia hodginsii collected from the central part of Fujian Province, China. All the four populations studied were found to have the same somatic chromosome numbers of 2n =22, but there were more or less differences in karotypeic constitution among the four populations. The two populations with columner tree crown have four sat-chromosomes, while the remainder two with wide tower-shaped tree crown have only twosat-chromosomes. The authors consider that the karyotypic variation might be related to the variations of crown shape and fertility of these populations, and suggest that the populations with columnar tree crown, which might be represent a new variant type, and have impirtant value, and should be protected and further studied.

The paper deals with two new species of the genus Baculum collected from Zhejiang Province. The type specimens are preserved in the Institute of Zoology, Academia Sinica. The measurements are all in millimeters. Baculum tianmushanense sp. Nov (figs. 1-3) This new species is similar to B. asaphum Chen et He, but differs in: 1.Median carina of body distinct; 2. Front femur without serrations and four posterior femora with 1-2 teeth on the apical portion of the inferior median carina; 3. Posterior margin of anal segment emarginate deeply.Holotype ♀, allotype ♂, paratype 1 ♂. Mt. Tianmu, Zhejiang Province. 1947.Ⅷ. 26-31. collected by the institute of Zoology, Academia Sinica. Baculum brachycerum sp. Nov. (figs. 4-5) This new species is allied to B. intersulcatum Chen et He, but differs in:1. body without light patches; 2. two spines of head short obviously; 3. externoinferior carina of front femur with 3 broad teeth, and middle femur with 3-4 teeth on the apical portion of the inferior median carina; 4. hind margin of anal segment truncate obliquely. Body 95.0mm; pronotum 3.2mm; mesonotum 19.0mm; metanotum (with median segment) 15.8mm; median segment 3.0mm; front femur 34.0mm; middle femur 21.0mm. Male: unknown. Holotype ♀, Mt. Tianmu, Zhejiang Province. 1981. Ⅸ. 6. collected by Zhang Bao-lin.

The present paper deals with the survey and taxonomic study of egg parasitic wasps of larch caterpillar, Dendrolimus superans sibiricus Tschetv., in Daxinganling Mts. forests. Totally 5 wasp species were reared with 54.63(± 1.70) percent of the pest eggs were parasitized by them. It was showed that the egg parasitic wasps played a very important role in reducing the pest population in the Mts. forests. The 5 species, including a new pteromalid, are as follows.1. Proctotrupoidea 1) Telenomus tetratomus Thomson (Figs 1-4) (Scelionidae)Chalcidoidea 2) Pachyneuron solitarium (Hartig) (Figs 5 - 8) (Pteromalidae)3) Mesopolobus superansi Yang et Gu, sp. nov. (Figs 9-13) (Pteromalidae)4) Ooencyrtus pinicolus (Matsumura) (Figs 14-16) (Encyrtidae)5) Trichogramma dendrolimi Matsumura (Figs 17-19) (Trichogrammatidae)Mesopolobus superansi Yang et Gu, sp. nov. (Figs 9-13)Female: 1.9-2.2mm long. Blue-green with metallic lustre; gaster with posterior margin of tergite 1 to end purple-brown; antenna and legs having all segments except coxae stain-yellow with slight brown; wings hyaline.Head and thorax densely raised-reticulate. Head without occipital carina, the broadth 2.2 times as its length in dorsal view, 1.25 times as its height in facial view, and wider than thorax and gaster (50:42:46); POL 1.8 times as long as OOL; lateral ocellus separated from eye margin by 2.3 times its oblong diameter; toruli ovate in shape, separated from each other only by 1/2of their own width; clypeal margin slightly excised, about 0.23 times of the head width; scrobes shallow. Antenna (Fig. 10) 13-segmented with 3 anelli.Thorax wide and flat; pronotum with collar in middle part of anterior margine carinate; notauli not deep, but reaching 3/5 length of the mesoscutum; length of mesoscutum only 0.6 times of its width: scutellum longer than wide (26:22), and as long as mesoscutum. Propodeum (Fig. 13) with plicae and without median carina, in its median area having weak keels growing from anterior margin and extending posterio-laterally, and in its lateral parts reticulate. Forewing (Fig. 12) with marginal vein about 1.6 times of stigmal vein. Gaster (Fig. 13) as long as head and thorax combined, conic-ovate and pointed towards the tip.Male: 1.6--1.8mm long. Resembles female, but colour of body much brighter, with golden-green lustre; posterior half of gaster tergite 1 orange -yellow, and the other tergites purple-brown; antenna (Fig. 11) with scape and funicle 4 and 5 white, the other segments stain-yellow and basal part of club brown; on stigmal vein of forewing with a small fumeus spot; gaster shorter than head plus thorax.The new species is close to the Japanese M. tabatae (Ishii), 1938, which is an egg parasitoid of Dendrolimus albolineatus Matsumura, but can be distinguished by the key below:1 Body 1.9-2.2mm long: head only slightly wider than thorax (50:42);the lateral ocellus separated from eye margin by 2.3 times its own oblong diameter; toruli separated each other by 1/2 of their own width; scutellum longer than wide (26:22); propodeum without median carina; marginal vein of forewing only l.6 times of stigmal vein……………… Mesopolobus superansi sp. nov.2 Body 3.1mm long; head much wider than thorax (50:32); the lateral ocellus separated from eye margin only by its own diameter; toruli separated each other by their own width; scutellum as long as wide; propodeum having median carina; marginal vein of forewing 2 times of stigmal vein…………Mesopolobus tabatae (Ishii)

This study was carried out in Zhejiang Province from 1986 to 1990. The results showed that Trichogramma dendrolimi Matsumura began activities in late March and overwintered as pupa in the eggs of Dendrolimus punctatus Walker and D. latipennis Walker during early October to November. The wasp was found in forest the year round and its population peak coincided with the egg period of D. punctatus. The main factors effecting the growth and decline of the population of T. dendrolimi were host egg, honey plant and temperature.

This article mainly deals with the method of forest fire forecast in accordance with the establishment of the mathematical model. The mathematical model is established on basis of the study on the regularity of forest fire and fire danger grade determination after making both the study of the moisture content of combustible substances, the major cause of forest fire in the central area of Yunnan, and the analysis of not only the data obtained from many experiments on early spreading speed of forest fire, but also the historical data of forest fires and meteorological informations. After testing and analyzing this method in contrast with the way of fire forecast according to histoncal data, the result shows that this forecast method is an objective and scientific one with the characteristics of locality, practicality, and simplicity.Based on the above, this article also refers to the analysis of the atmospheric circulation and its physical quantity variation which is the cause of catastrophic forest fire in the central area of Yunnan. Thus the regularity of forest fire is figured out for forecasting catastrophic fires in this area.

Based on the density theory of plant growth and related biological hypotheses, the author proposed a new empirical model describing the natural thinning process in an even-ages plant population, i. e. 1/ρ=α(lnω-lnω₀)^β+1/ρ₀ where ρ and ω is population density and weight mean plant, ρ₀ and ω₀ is the initial population density and initial plant weight reapectively, and α and β are parameters. it is proved that the model fits observed data from woody and herby plant density/growth experiments very well, and which is very simple. Therefore it is very useful in practice. Discussing the features and meaning of the model, it is found that the growth process of plants shown in the model is a kind of the Gompertz Curve.

Four kinds of electrically conductive plywood(ECP) can be obtained by adding different conductive agents into urea-formalhedyhe(UF), and the area resistivity of glue films will be decreased below 100 ohm. When electric current flows through those films, the unevenness of the surface temperature distribution can be caused by the high-temperature area with electrods between veneers and the low-temperature corners and sides, but small size conductive particle can improve it. The studies indicate that the surface temperature can distribute evenly by mixing HF-2 type conductive agent with MG type diluent in UF. Not only will the temperature range of the central surface be decreasde below 4℃ with its variation coefficient less than 6%, but also the shear strength can be improved obviously.

The wood density of 17 species by means of modified wood densitiometer was first reported in China. The results showed that wood density components, such as average wood density, average earlywood density, average latewood density, the maximum wood density, the minimum wood density, the gradient of wood density and the variation range of wood density, can be measured rapidly and efficiently by direct scanning using X-ray wood densitiometer, which was successful been modified and reequiped on a set of X-ray diffractometer (Model D-max3B). This equipment and measurement method are strongly recommanded by the authors for its power in wood properties genetic improvement.

The vertical distribution of cumulative leaf area, bole sapwood area, bole sapwood permeability and sapwood area sapwood permeability, the relationships between cumulative leaf area and sapwood area and between cumulative leaf area and sapwood area sapwood permeability for individual trees of Larix principis-rupprechtii Mayr were examined using a physiological analysis based on Darcy's law. Sapwood area and sapwood area sapwood permeability decreased linearly within the crown with increasing height above the ground.Below the crown, the change trend of sapwood area turned out contrary to the sapwood area sapwood permeability, Sapwood area sapwood permeability allowed an accurate prediction of leaf area. The sapwood resistances to water flow from the ground to the 6.5m height above the ground, from the ground to the base of the live crown and from the base of live crown to the 6.5m height above the ground, were respectively 0.93241 atm. s. cm^-8, 0.33000 atm.s. cm^-8 that was 35.39 percentage of the total resistance and 0.60241 atm. s.cm^-8 that was 64.61 percentage of the total resistance.

This paper deals with that developing undergrowth vegetation can improve soil physical and chemical properties, and enhance biological activities of forest soil in the subtrpical forest region where Chinese fir grows very well.Therefore, the scientific data and ways are provided for maintaining and enhancing soil fertility and improving soil decline of Chinese fir plantation by rational forest management.

Twenty four species growing in Hainan island were sampled to study the equilibrium moisture content of wood(We) in Haikou region. the experiment lasted 26 months and got the values of We of the species from 14.6% to 1 9.3 %, averaging 17. 1 %, and the difference, 0-2 %, between months within a year. The differences among species and between sapwood and heartwood of Artocarpus styracifolia were highly significant. The regression equation, We =5. 0904 + 0. 1683φ - 0. 0777t, obtained can express the relationship between We and relative humidity(φ) and temperature(t) in Haikou region. Based on the equation a t-φ-We figure was drawn.