An investigation on the vegetative growth of man- made forest of young Larix principis-rupprechtii Mayr. Had been carried out from 1980—1983. The result obtained from this investigation on elongation growth of shoot, marphology of radial growth of main stem and roots, and changes in differentiations and structures of various tissue cells as well as the accumulation of dry matter proved that the vegetative growths of various parts mentioned above in this species show significantly seasonal periodicity and previous rhythm of interdependence. The formation of young xylem and bark, and the relationship between it and whole vegetative growth had been analysed. It presents some good idea for high-yield planting and improving traditional forest management according to the rules of growth and development summarized in this paper.

The study of anthorcnose of Camellia oleifera is of economic and scientific importance. The present paper deals with the effects of toxin produced by Colletotrichum camelliae on PAL, which is a determinant enzyme in secondary metabolism and is closely related to disease resistance.Colletoribhum camelliae secretes a toxic substance into culture medium. The toxic substance causes tomato seedling to wilt and induces Lession fleck on leaves of Camellia oleifera. PAL activities from leaves, callus and suspension cells of Camellia oleifera are stimulated increasingly. The time course in increased PAL activities is the same between susceptible and resistant forms, but the increased extent in resistance is equivalent to 2.4—fold in susceptible form during 44 hr. The increase in PAL activity is the result from activation of inactived-enzyme molecular and re-synthesed enzyme protein. The possible roles of toxin produced by C. camelliae in resistance and possibility to take highness in PAL activity which is induced by the toxin for a biochemical indicator of resistance are discussed.

Oil tea (Camellia oleifera Abel) anthracnose caused by Glomerella camelliae is a serious disease. The pathogen of anthracnose in flowers can infect young fruits directly, A bacteria, Bucillus subtillis, isolated from old back of oil tea has strong ability to occupy the place in flowers, and thus prevents the pathogen to attact fruits. The proportion of diseased fruits were reduced about 60%.Colletotrichum gloeosporioides cul. Populus can penetrete young fruits of oil tea but without any sympotoms. Spraying suspensive solution of G. camelliae spores on the fruits inoculated by C. gloeosporioides cul. populus, the germination of G.camelliae spores were inhibited. In the stand, spraying C. gloeosporioides cul. populus spores on oil tea trees, the rate of diseased fruits were reduced obviously.In the field, using the bacteria during bloom of oil tea trees and using C. gloeosporioides cul. populus in the stage of young fruits continuosly, the effect of control was more obvious. This biological control method can avoid the chemical pollution.

Insects cause considerable loss of seed in Keteleeria evelyniana Mast. in the central region of Yunnan Province.The insects damaged cone ranged from 60 to 90 percent. The most important species is Blastopetrova keteleericola Liu et Wu, gen. et sp. nov. Other insects are:Shirahoshizo coniferae Chao (Coleoptera:Curculionidae) and Dioryctria sp. (Lepidoptera: Pyralidae).In this paper, besides the descriptions of morphological characteristic of both adult and immature stages on Blastopetrova keteleericoIa, its bionomies, natural enemies, and control measures are also given.Blastopetrova Liu et Wu, Gen. Nov.Fore wing without a costal fold in male. Vein M₂ and M₃ closely approximated or connate at base. Male genitalia: With clasper(harpe). Sacculus is nearly 1/2 as long as valva, basal opening small. Female genitalia: Apophyses anteriores is almost as long as apophyses posteriores. With a pair of signa, the form different.Type species Blastopetrova keteleericola, sp. nov.This new genus is closely allied to Petrova Heinr. and Blastesthia Obr., but may be distinguished by the venation and the genitalia. In the fore wing of Petrova, vein, M₂ and M₃ separate at base. Blastesthia is with only one signa on the bursa copulatrix. In addition, Gravitarmata Obr., Barbara Heinr. and Syropetrova Diak. are related to the new genus, but these genera are without claspers. The main differences among these genera are distinguished by a key in this paper.Blastopetrova keteleericola Liu et Wu, sp. nov.Body length: 7—11mm, 10—12mm. Wing expanse: 17—23mm, 22.5—26mm. Fore wing with a lot of irregular cloudy patterns, which consist of grey, reddish brown and black. Ocellus grey. Central cell is separated by stem R. and M. Hind wing broad, grey. Central cell is separated by stem M₍₁₊₂₎ and M₃.Male genitalia:Tegumen broad. Uncus very small, hemispheric. Socii developed, finger like; long, pending. Valva with obvious neck. Cuculus oval, with densely long hair on the surface,a row short spines on the outer margin. Sacculus large. Basal opening very small. Aedeagus short; cornuti, a cluster.Female genitalia: papillae anales longer, kidney shaped. Ostium bursae round; sterigma larger, hemicycle. Ductus bursae long, with two slender sclerite at the section approaching ostium bursae. Signa two, the big one "I"-shaped, the small one rivet form.Holotype (), Allotype(♀):Yunnan Province, Anning County, 18—Ⅲ—1983, 1885m. Collected by Wu Chunsheng.Paratypes(30, 30♀♀):Yunnan Province, Anning County, Huaning County, Lufeng. County. ibid.Holotype, Allotype and a part of Paratypes are preserved in the Institute of Zoology, Academia Sinica; and another part of Paratypes are preserved in Southwestern Forestry College.

A wealth of ancient China's knowledge of forest science and technology have been accumulated. They were recorded in various classics scatteredly. These classics were The Book of Odes (Shi Jing), Works of Guanzi (Guanzi), Rites of the Zhou Dynasty (Zhou Li), Monthly Ordinances for the Four Classes of People (Si Min Yue Ling), Literary Expositor (Er Ya), Extensive Magazine on Nature (Guang Zhi), Essential Ways for Living of the Common People(Qi Min Yao Shu), Manual of Bamboo(Zhu Pu), Manual of Tongtree(Tong Pu),Exploitation of the Works of Nature (Tian Gong Kai Wu), etc. The categories of these knowledge include identification of trees, phenology of trees, forest ecology, forest management, forest cultivation, forest protection and forest utilization. These were a precious legacy of history. In this artical, the writer collects those important historial materials, which recorded in Chinese classics, puts them in order and analysis, and in the sequence as Pre-Qin period, Qin Dynasty and Han Dynasty period, Tang Dynasty and Song Dynasty period, Ming Dynasty and Qing Dynasty period.

Aigeiros has been regarded as a larger section of Paplar genus.Hybridized among species within Aigeiros section, the appearance and plantation of Populus×eurarnericana in a large scale have been promoting the yield increase of Poplar trees in the world. It is believed that the sufficient gene resources and proper way of breeding are the necessity to bring about a fine clone of Populus × euramericana. Based on the advanced experience of some developed countries, Italy in particular, and in light of the actual condition in our country, This paper introduced some poplar gene resources; the appearance and application of hybridization among speeies; the present main trend in the breeding of Populus × euramericana. In addition, we have evaluated the systematic process and methods of poplar genetic improvement.

It is quite difficult to identify the various kinds of deformation in the apparent mechanical behaviour of poplar wood as loaded perpendicular to its grain. However, by means of separating the theological parameters, it was found somewhat effective in studing of the theological behaviour of poplar wood under compression perpendicular to its grain. The various kinds of deformations of the specimen under various temperature and moisture content, as well as the rheological behaviour of the specimen with water vapour passing through them were investigated. The testing condition is so designed for the better understanding of the theological behaviour of wood material in compression as it occurs in pressing process of particleboard. The viscoelasticity reveals the mechanical properties of high polymers of three dimensional network. The elastical compliance and retarded elastic compliance of the specimen increase only slightly with increasing temperature in the testing range (20—105℃) in ovendry condition, increase sharply with increasing temperature in wet condition or with water vapour passing through specimen. In the condition of room temperature, the elastic compliance and retarded elastic compliance increase definitely with increasing moisture content of specimen.

Seeds of Pinus massoniana stored in bags under room conditions areapt to deteriorate, and the germination rate and vigour index of the seeds reduced significanlly. The ultrastruetUre of the deteriorated seeds damaged seriously. Both the organelles and membrane system destroyed. The mitochondrion is very sensitive to the deterioration. The nucleus, endoplasmie reticulum, and the microsomes degraded. In the cells of non-viable seeds, the spheresomes fuse into groups so that organelle was very dificult to be distinguished. On the contrary, the seeds stored in hermetic vessels have sound cell ultrastructure with various organelles and intact membrane system. It seems reasonable to assume that the seeds of Pinus massoniana should be stored in hermetic containers at low temperature to save their vitality.

The fertilizing technique has been studied with the ¹⁵N tracing method, the material is seedlings of Frexinus pennsylvanica. The result show that the applying of fertilizer of seedlings is different in four growing stage and five position of fertilizing, the applying of fertilizer is high during the fast-growing period, meanwhile the position of fertilizing should be in the area of 5cm diameter around the root in seedling stage, 5—10cm diameter in fast-growth period. The depth should be 0—5cm in seedling stage and 5 —10cm in fast-growing period respectively.

14 bioclimatological factors related to growing and developing of olive, from 81 sample data in Hubei province have been used in principal component analysis,as a result,6 bioclimatological regions are determined. Temperature and sunshin play two leading roles among the 14 factors and reflect main difference between regions. Low temperature is a limited factor for developing olive production. Although it's possible to develop olive production in Ⅴ, Ⅵ regions, in economic efficiency, developing other suitable economic trees is superior to olive, because of some unfavourable climate factors. Drought in winter, shown the largest variance among the 14 factors, is one of the problems which must be solved for olive production in the province January mean temperature has a close relationship with most of temperature factors, it's the best index to stand for temperature.

Populas hopeiensis Hu et Chow is a tree species with very low rootbility. We had extracted endohormone from its buds and cortical layers and had carried out biological determination and gaseous phase determination. The result shows:1. Hebei poplar cuttings contains many kinds of active root inhibition materials, mainly ABA. Its content in the bud is higher than in the cortical layer.2. The content of ABA is variable according to the changes of season: From rest period to the period of germination, ABA content in the buds are from 535ng/g, fresh weight decreasing to 29.5ng/g; ABA content in the cortices are from 230ng/g decreasing to 19ng/g. But its GA₃ and IAA contents are presented a picture of curve variation.3. The survival rate of Hebei poplar is low. The root inhibition material in the cutting to hampers the growth and development of the cutting's root primordium.4. We adopt the way of soaking the cuttings in the water. In autumn, the artificial defoliation will be shifted to an earlier time; in winter, We store the cuttings under low temperature. All the abovementioned ways of treating cuttings will regulate the proportional relationship of the two matters existing in the cuttings. They are beneficial to raise the survival rate of the cuttings.5. The application of exo-hormone will raise the healing ability of the tissues, and it will promote the activities of peroxidase and isoenzyme, thereby increasing the rootability of the cuttings. If the cuttings are treated with NAA, HA,and RM₃ in combination, the enzume activity will raise by 37%; or if the cuttings are treated separately with NAA or HA, the enzyme activity will raise only by 8%.

Primary Korean pine forests are uneven-aged and complex in the area of the xiao Xing An Hountain. The stocking in the main story amounts to more than 80% of the volume. The forest mainly consists of three or four-age-class trees, the attribute is that the main part in the stand is formed by the trees whose ages belong to the average age-class, while the trees whose age-class is one age-class higher or lower than the average age-class is the second main part. In the main stand, the Korean pine trees at the ages of Ⅸ Ⅹ Ⅺ age-class (161—220 year) are the most widely distributed and amount to 75%.To protect the existing primary Korean pine forest and increse their quality, intensive management must be treated in the survived primary Korean pine forest, cleaning-cutting and repair-planting should only be used in protection forest management zone. In the management zone selection cutting must be used.

In this paper, we present the purification and analysis of some features of nuclear polyhedrosis virus of poplar looper,Apocheima cinerarius. The polyhedrosis inclusion bodies(PIB)were treated respectively by urea, SDS and NaC1 in 0.02M Tris-HCl (pH7.6)-0.005MEDTA buffer. The Virions, released from PIB treated with 0.05M NaCl+0.05M Na₂CO₃,and the nucleocapsids, released from virions treated with 2% Nonidet p-40 (Np-40), were purified with the techniques of sucrose density gradients centrifugation and Sepharose 2B gel column chromatography. Thevirions and nucleoeapsids are different in ultraviolet absorption spectrums. The purity of virions and nucleocapsids was tested by using 10% polyacrylamide gels electrophorese. The process of PIB solution was observed by scanning and transmission electronic microscopy. The analysed results show that DNA content is about 6μg per mg of dry PIB. The determination of 16 kinds amino acids composition of PIB shows that the recovery rate is about 77.09%. The sedimentation coefficient of virions is about 705(S₍₂₀₎^w), and a 57(S₍₂₀₎^w) component part was observed at the same time. The results are discussed in this paper.

Experiments proved that the pine moth Dendrolimus spectabilis, D. tabulaeformis, D. punctatus, D. punctatus Wenshanensis and cotton Bollworm Heliothis armigera and silkworm Bombyx mori could be infected by D. spectabilis CPV which was introduced from Japan.The antigens in this test were from D. punctatus which was infected by D. spectabilis CPV from Japan and other pine moths, these antigens were purified by sucrose gradient centrifugation.Antiserum was obtained by immunizing rabbits with purified preparations of virions from CPV of D. punctatus (infected by Japanse D. spectabilis CPV).Serological comparision of virions from above mentioned pine moths was done by absorption test and counter immuno electrophoresis. The results obtained are as follows:The results of the experiments indicated that all pine moth CPVs,no matter whether it is Chinese or Japanese were serologically indistingui shable.Antiserum of pine moth CPV virions did not cross-react with three NPV and one GV.The pine moth CPV and cotton bollworm CPV were found to be serologically closely related, but the pine moth CPV and silkworm CPV could be differentiated using absorption test and counter immuno eletrophoresis technique.

This paper concerns the bioassay of virus activity and stability of the nuclear polyhedrosis of Eriogyna pyretorum.Early fourth-instar larvae were fed on camphorwood leaves immersed with polyhedral inclusion bodies (PIB)suspension of virus. The LC₅₀ and 95% fiduciallimits were 1.49×10⁵ and 3.88×10⁴—5.72×10⁵ PIBs/ml respectively. Mortality of larvae increased with the increasing of concentration of polyhedral inclusion bodies suspension and the decreasing instar in a limited range. Temperature had no influence upon total mortality but it did affect the death rate.Polyhedral bodies had a relatively stability. The dead larvae boeies and polyhedral bodies suspension still had a high infection ability after they were stored in the refregerator at 0—4℃ for 10 months.The effect of ultraviolet (UV-) rays on the efficiency of nuclear polyhedrosis virus was significant. Its efficiency was reduced considerably after 1×10⁸ PIBs/ml was exposed under the strong sunlight for 16 hours; its efficiency was lost mostly under the Uv-lamp (30w, 40cm)for 30—40 minutes; and was almost lost completely under Uv-lamp for 60 minutes.The effect of field experiments of the nuclear polyhedrosis virus of suspensions on the larvae of Eriogyna pyretorum was effective. After tenth days the mortality of 43.5%, 51.4% and 80.3% was obtained by using nuclear polyhedrosis virus concentrations of 1.7×10⁵, 1.7x10⁶ and 1.7×10⁷/ml respectively.

Masson Pine (Pinus massoniana Lamb.) is a timber species growing quickly and widely in southern China. But its wood is easily deteriorated by termites and various decaying fungi, and becomes warping easily when seasoning. This wood has hardly been made full-use of up to now.This paper discusses the reason why warping occures so commonly in this wood and illustrates the use of rosin as a constituent of waterrepellent preservative. A simple treating process was suggested and a preliminary trial proved successful.

These years, many places in the apline forest region begin to use none power ropeway as a transporting machine at the foot of the mountain to carry the logs which are transported by the powerway from the top. It has become an economic and practical wood yeading equipment.Now, however, there have not been any theoretical method to design and calculate this kind of none power ropeway. Most of them were built by experimence. So problems often occur. Therefore, I put forward this article——"None Power Ropeway Design and Calculation Method". The followings are the points mentioned in the article:1. The maximum gliding force of the loaded pulley.2. The minimum loading of carrying empty pulley by a loaded one.3. The possible maximum speed of log gliding.4. The rational winding number of the speed controller.5. The calibration and determination of the standards for the haul line.