The experiments on introduction and plantation were carried out in Shapotou area.The survival rate,preserval rate and the characteristics of thegrowth of plant were observed,and some best sand-stablizing plant species with higher resistant ability and adaptability were selected.On this basis,the mechanism of drought-resistance of these plant species was detailly studied by electric microscope and some analytic methods on the aspect of plantphysiology.Doing so,the scientific evidences on the nature of biology andphysiology will be provided to the introduction of more sand-stablizing plantspecies. On the aspect of morphological structure,by the study,xerophytic succulent Reaumuria soongarica and Calligonum arborescense are characterized by more wax on leaf surface,thicker cuticle and cell wall and by the pittedstoma.But for the xerophytic Caragana korshinskii and Oxytropis aciphylla,their leaf shape is smaller and leaf surface is covered with dense grey floss,covering the stoma,transpiration is then reduced and the leaf-succulent tissue is avoided from burn. On the aspect of physiological nature,these xerophytes are characterized by higher glutinosity of cytoplasm higher elasticity,better permeability,higher capacity for antidetaching of water and heat-resistance,less transpiration,higher content of soluable sugar and higher content of bound water,and higher ratio between bound water and free water,consequently they possess higher capability for the drought-resistance.

After a series of seeds of Hopea hainanensis or Vatica astrotricha were treatedunder artificial drying for different days at 25℃ or 20℃,to reduce theirwater content to what this experiment was designed,two groups of thesetreated seeds were used for comparing their vigor and ultrastructural changes of their radicle-tip cells,respectively.The results obtained are summarized as follows: Following that the water content was reduced continuously,the vigorexpressed as GP(germination percent),GI(germination index)and Ⅵ(vigor index)also decreased obivously for these treated seeds in the germination test.And the morpholgy of embryos and their cotylendons changed todarkening and wilting in different extents. For Hopea hainanensis,when its water content was reduced from 34.9%to 25.6% and GP decreased from 65% to 20%,the ultrastructures ofradicle-tip cells showed significant changes: (1) The cytoplasm formed a lot of vesicles,but the fine structure ofnucleus seemed to be normal. (2) The tonoplast ruptured,the structures in the cell became indistinct. (3) The cytoplasm severely segregated with cell wall,nuclear membrane and nucleolus could not be distinguished. When the seed water content was continuously reduced to 20.3% and they had all died,all the structures in the cell were completely destroyed,cytoplasm was disintegrated.Most of substances in some cells had disappeared;and for a great number of cells,there only the cell wall remained. For Vatica astrotricha,its vigor and ultrastructures in radicle-tip cellschanged similarly in the main as Hopea hainanensis.

This paper presents the results of analysis on the height,d.b.h.andvolume increment of 99 korean pine trees and has found out the conclusionof its growth In Yichun Forest Area,Heilungjiang Province. In the natural stands of korean pine on Ⅱ Ⅲ Ⅳ site classes the maximumannual height growth of these stands in the age of 69,65,and 51 years old,are 0.31,0.28 and 0.23m respectively.The maximum diameterincrements ofthese stands in the age of 100,92 and 93 years old,are 0.44,0.41 and 0.36cm,respectively.The maximum annual volume increments appear in the age of170—180 years old. consequently,We have to pay more attention in managing,korean pinestands during the young stage,say,before 50 years old.

Sex attractant for pine caterpillar(Dendrolimus tabulaeformis Tsai et Liu)—(Z,E)-5,7-dodecadien-1-ol(Ⅰ),(Z,E)-5,7-dodecadien-1-yl acetate(Ⅱ) and(Z,E)-5,7-dodecadien-1-yl propionate (Ⅲ)were synthesized via Wittig condensation reaction. Field trials were undertaken in Chinese pine fields in the suburbs around Beijing in the summer of 1980.The experiments showed that mixture of Ⅰ,Ⅱ and Ⅲ gave strong attractant activity to the male pine caterpillar.Some male moths were attracted to simple Ⅰ,but few males to Ⅱ or Ⅲ.

Length 6.0 to 7.5mm．Blue black，strongly shining．Antenna dark brown. Apex of mandible slightly reddish brown；apex of pulpus brown；labrum black or dark brown．Lateral sides of abdomin al tergites 2 to 5 and avterior portions of sterites 1 to 5 yellowish brown．Coxae black，trochanters and dorsal sutrace of femur brown or light dark brown，tibia and tarsus yellowish brown．Wing subhyaline．Venation dark broWN．Head and thorax with grey hairs．Antenna serrate，long，more thall head width，with 12 segments；third segment simple，about 3/4 length of fourth segment；rami each shorter than length of their respective segment；rami of central segments Iongest．OOL: POL：OCL=1：1：2．Anterior margin of clypeus moderately emarginate，arcuate．Clypeus，supraclypeal area and paraantennal area densely punctated；other areas of head and abdomell almost impunctated；thorax with uniform small punctures．Lancet acute trianglar in shape，with 11 annuli，about 1/3 to 1/5 length of annuli extending 0ver virgae；ventral lobes 1 to 4 rather protuberant (fig．A)．Male：Length 5．5 t0 7．0ram．Strongly shining blue black．Labrum slightly reddish brown．Median and lateral portions of abdominal tergites 3 to 4 yellowish brown；lateral sides of abdominal tergites 2，5，6 more or less yellowish; abdominal sternites 1 to 5 mostly deep yellow．Legs beyond black coxae yellow to deep yellow．Anteuna with 12 segments(rarely with 11 segments)，unipectinate．OOL：PoL：0CL=3：3：5．Wing length 4.5 mm．Other characters as for female．Penis valve as in fig．B．Larva：Length 12 to 17ram．Head black．Thorax deep green．Abdomen mostly light green．Dorsal surface of thoracic leg black．Bristles on head surface short，minute and thinly scattered．Preclypeus with 4 thick and longbristles．Antenna with 3 segments，mammillated．Abdominal segmelIt 3 subdivided into 6 annuletst tergum of 1 0th abdominal segment with many short spines． Host：Cones of Cuprassus funebris Endl. Holotype：female，Sichuan(Jintang)，2．N．1982，Li Yuan-xiang．Auotype-male，the same as holotype．Paratypes：5 males，15 females，Sichuan(Jintang，Pengxi)，2．10．11．N．1982，Li Yuan-xiang，Wu Hong—guang．All the type specimens are preserved Intdccollection of the Forest Entomology Division，Forest Research Institute,Chinese Academy of Forestry．The new species may be readily separated from、Augomonctenus libooedrll and A．Talo8u8 the only other two species in the genus by the following characters：Abdomen shining blue black with lateral sides of 2 to 5 tergites and anterior portions of 1 to 5 sternites in female，and median and lateral sides of 3 to 4 tergites in male yellowishbrown anterior margin of clypeus of female moderately emarginated，arcuate．It was compared with a female of Augomonootenu8 libooedrii Rohwer bearing the following data：Larvae coll．Sept．2，1964，adult--July 16，1989：Medford，Oreg．Cones of incense cedar，K．Goedont roared by C．W．Baker：Augomonodenu*liboeedrii Roh．D．R．Smith 82．The species is named for Dr．D．R．Smith．

The present paper points out that the combustibility of forests may be divided by the quantitative method of biomass and energy of forest.A concrete analysis of the artificial coniferous forests such as red pine,scotch pine and larch forests in the north-eastern China was carried out.The results showed that the quantity and energy of the dangerous combustible materials such as surface litter grass,bush,needle,twig will as diameter less than 1cm,dry branch are the most important basis for dividing the combustibility of forests. This paper also puts forward that the main factors influencing quantity and energy of the combustible materials in forests are topography,age of trees and moisture content of soil. Based on these factors the index of the quantity and energy of the combustible materials of various forests are estimated.

Natural durability of poplar wood is very low.The samples of 3 species (Populus deltoides cv."Harvard"(ex.1-63/51),Populus euramericana cv."San Martino"(ex.1-72/58),Populus tomentosa Carr.)were exposed to wood destroying fungus (Lenzites trabea Pers.ex Fr.) for a month and a half in the standard soil block test.The results indicated:1) The mean weight lost of untreated solid wood was around 40 percent,but plywood's about 35 percent that was slightly lower than the wood.2)The mean weight lost of poplar ply wood was threefold as large as ash's and bass's.Therefore,it is very importance for improving the durability of the poplar wood which used as raw material of plywood. Acetylation of poplar veneer in the vapor phase with anhydride has been carried out by using potassium acetate as catalyst and D.M.F.as swelling agent. Acetylation is a effective treatment of nontoxic type against biological deterioration.Before or after decay testing,the weight of the acetylated plywood is much the same.It shows that the acetylation of veneer can bring about marked improvement in durability of poplar plywood.

This paper recounts the way for solving two key technological problems of the U.L.V.spraying equipment.The problems are to increase the spraying range and to control the diameter of the droplets by adopting the combined centrifugal and air-blast atomization.

This paper discusses the theoretical problems of socialist forest price.In man-made forests,timber forest price is the currency expression of the stumpage value and protection forest price is the currency expression of value of forest colony.Because it is not the product of man-labour,natural forest is valueless,but its price can be calculated in the form of stumpage.The economic essence of forest price is the currency calculating of forest land differential income.Value-forming process and value framework of stumpage of manmade forests are analysed.Various factors constituting forest price and the in terrelations between them are further analysed.At last,the calculating model of forest price is developed.