Seven tree species have been choosed for the Study of deep planting in Sand soil．They are Populus×euramericana(Dode)Guinier cv．Sacrau 79，P．X euramericana(Dode)Guinier cv．I-214，P．Xeuramericana cv．Polska-15A，P．Tomentosa Carr．，Ulmus pumila L.，Ailanthus aItissima(Mill) Swingle and Robinia pseudoacacia L．The depth of planting is 50CK，100， 150，200，and 250era respectively．The survival rate，reserVe rate and growth rate have been observed for 5 years．The results Show that the surviral rate of the deep planted poplars is 1.4—9.5 times as high as that of CK (50era)and the re serve rate is 1—8.9 times as high as that of CK．After five years，the tree height and diameter at breast height and diameter at breast he'ight and diameter at breast height of P．Xeuramericana CV．Sacrau，P．Xeuramericana CV．I-214 and P．Tomentosa are 1.34—1.62，1.13—1.22 and 1.08—1.22 times than those of CK respectively．Deep-planted Ulmus pumila has not been found any increases in sUrvival rate and growth rate．Ailanthus altissima and Robinia pseudoacacia are not sukable for deep-planting．The study shows that in sand soil area，if underg round water is deeper than 3m，the depth of planting for poplars Should be 100-150cm，

In the light of phytocoenology，this paper deals with the suitable species and the adequate row distance in LAC plantarion so as to accommodate host trees and LAC insects with a favourable biocycle．It provides some ideas and results to the improvement of LAC culture for a hig her produc tion as well．

This paper presented here deals with the effect efficiency in fruitfulness of control pollination among different cultivars．The data obtanied in this Study indicates that most of olive cultivars exhibit low fruit setting as selfpollination．But fruitfulness can be obtained if optimum pollinators are used． Cross pollination between different cultivars varied on fruit setting which shows a difference in cross-compatibility．It was noted however，there is non-relationship between germination rate of pollen on stigma and cross-compatibility．The effects of reciprocal cross in most of olive cultivars are different only a few of them appeare to be similarly．Therefor it is necessary to screen the results of reciprocal cross between various cultivars．To identify cross-compatibility of most cultivars grown in same region and find out better pollinators for new olive plantation cross test in large scale are needed．Based on Statistical analysis of data obtained cross-comhinations between cultivars planted now in Chenggu county can be divided into four groups having different level of CROSS-compatibility(from the best to bad)．Thus，to establish olive plantation in Chenggu region must select the cultivars from the best and better groups as a major cultivar and pollinator that will give more promise to maintain the production of olive plantations at a high level.

In this paper，correlation and regression analysis arc used to deal with the correlations between produetion of Spruce and soil charaeteristicS and geomorphology according to findings of 37 plots in the forest which distribute 0n the north side and seminorth Side of hill with all altitute of 1800-2600m above sea-level in north Guanqin mountain．The result indicates that the main factors are texture，pH and CaCO₃ content of soil~the favour able conditions are the lower pH，no stone and the sandy soil Structure on upper layer and clayey soil on．lower layer．The latter indicates indirectely that the water-holding capacity of soil has effects upon growth for spruce．In order to predict the productivity of spruce，an equation in re spect to the main influence factors is set up．Following analysis of characteristics of the main factors，the paper explains the special characteristics of．burozem in its physical and Chemical nature．Interhal relations between the main factors and the conifers．In this area，and the habitat suitable its growth．

The transpiration variation in space and time in a young poplar plantation(Populus deltoides Bartr.cv.‘Lux’ex．I-69/55)was studied in 1983—1984 for the purpose of inquiring into the relationship between transpiration water-consumption and growth in young poplar plantation so as to provide an evidenee for rational irrigation．The research has revealed that the transpiration of abaxial surface is higher than that of adaxial;the transpiration rates of different position on identical leaf surface are Similar；there is a fluetuaring movement in transpiration rate along an ordinal leayes of a branch;the transpiration is higher in low layer of crown，medium in middle layer and lower in the upper layer;the daily transpiration process(sunny day)forms a curve with a peak at about 10 am．；the seasonal fluctuation of transpiration is as follow：transpiration is higher in early spring，then goes down，rises in the autumn and goes down again by the end of growing season．A formula for estimation of crown transpiration water-consumption has been determined according to the analysis of the factors influencing transpiration in space and time and meteorological factors，and the transpiration water-consumption of crown was estimated by use of the formula．

This Paper is on the basis of the data from the table of standgrowth about main timber-tree species in China，to count the tree-number of stand density about different tree pecies forest-types site-classes and different mean diatmeter．Classes；Meanwhile，to courtt the tree-number reserve coeffieient(L)after Stand natural-thinning，the coefficient(L)equals the ratio that a digger diameter class comDares with a smaller diameter class．The coefficient(L)has the following law:(1)when density of stoeking is 1.0，L will increasea Iong with the increasing of stand rilean diameter．L is not a fixed ratio；(2)when density of stocking is 1.0 and stand mean diameter equals tree spacing，the L of the same tree species and different forest-type and site-class is very close each other or equal．TeSting and verifying shows L of the tree species in our country is basicallyclose or eaual．This law will provide some mportant data for forestimprovement-cutting．Srand technical mature，and growth forecast．

These studies were carried out at the Institute of Silviculture University of Freiburg，the Federal Republic of Germany from 1983- 1984．In a 19 years-old Picea abies stand，four trees chosen at random for the test．The tes t shoots were obtained from the 2nd，4th, fith and 7th crown layers of these four test trees．Under the constant conditions，the needle gas exchange was measured in annual shoots(1983)and two years—old shoots(1982)．Here are the main results． The foilowing data is drRWll from the shoots of the 2nd and 7th crowll layer．The 2nd crowll layer indicate the upper part of the crown，while the 7th indieaters the lower part of the crown．The needle photosynthetic capacity decreased as the crown increased．There Wa Sadecrea．Se of 20．4—27.8，in the annual shoots and of 40.5—47.9％in the two years—old shoots．However，the ratio of needle water loss in—creased as the CROWR layers increased．IN the annual shoot，it increased by 4．8—23．7％，38．8—61．5％respectively．The intensity of needle dark respiration also increased as the crown layers increased．It increased by 5．8—10．9％in the annual shoots and by 3.5一l7.3％in the two years-old shoots．The photosynthetic economic coefficient changed in the same way aS the needle photosynthetic capacity did．It dereased by 10——26％in the annual shoots and by 44——了1％in the two years—old shoots

Mr．Cheng Zichun’s paper of“A Study on the Management- Calculation Diagranl of Pinus massoniana in Hunan”was published in “Forest Science”，No.1，1984．The meth'od and base of compilinging standard table in author’S paper are mainly discus sed in this paper．By means of comparing the breast height form factor (f_1.3)and the experimental form factar(f_a) contained in the standard table (the whole name calls“the Standard Table of Basal Area and Volume of Per Hectare Stand”)which the author compiled for his Calculation-diagram with those of the Central-South Pinus massoniana Standard Table which was often used in the past，by testing with real volume of sample plots，we found that because the base of that table and the compiling method are not reasonable the author's standard table will bring about greater error than the real volume of Stand，or that of Central-South Standard Table when it is used to estimate the volume of stand，meantime，the error goes greatly beyond the permitted limit，so we think that it is not Suitable for use in practice．

In order to improve the quality of seedlings and afforestation，a test of effects of different Standard Seedlings，Cunnigharnia lanceolata，Schima superba ect，on afforestation was conducted in 1980-1984．The experimental area was located at Xiayang，Nanping，Fujian province on low mountains，semi-sunny slopes and claysoil．The results are stared as following. 1．The seedlings class I for both Cunnighamia lanceolata and Schima superba have a survival rate of 100 percent，Class Ⅱ 100 percent for C．Laceolate，98 percent for S．Superba，class Ⅲ 90 percent for both speeies．2．It is proved that seedling quality Still have an effect on tree growth 4 years later after plantation．

This paper explores the dormancy of the seed of Magnolia denudata Desr.，its dormancy breaking process and the germination conditions．The seed dormancy will not be breaken．Until a postmaturation to be completed in the condition of a low temperature and moisture．Gibberellin addition can hasten the dormancy breaking process．A suitable germination temperature for the seed postmaturation is at anywhere between 20—30℃．The seed of Magnolia denudata is insensitive to the light exposure．

This Study were carried out for 6 years and detail descriPtion of the objects，method，demarcation of phenological stages，site conditions and relalion beween phenological phenomenon and lac production are：also givten here．It has been seen from the data that the phenological Stages of the Same plant may be very different in different years For example, in the years eith higher temprature and rich rainfall the nutritional growth stages of the four host Plants would begin earlier and extand longer with the exception of Dalbergia szemaoensis in the latter aspect．While in those With higher temprature but less rainfall the seed-fall stage would make their appearances earlier，and the seeding stages of the four species of host plants cut short period．The pods of Dalbergia obtusifolia，when fully ripened，start to fall and last only two weeks to its final falling．This shows the importance of seizing the due time to collect seeds．

In the light of solving the problems in barren hills afforestation，a study on the new technology of using chemical herbicide instead of burning cultivation to eradicate weeds，such like Imperata cylindrica，Saccharumarundinaceum and Miacanthusftoridulus，was conducted during 1981 to 1094．，Based Oil the experiments in about 200 small spots and the demonstrative tests in some larger areas，it has been proved that the following records are the optimum proportions of spraying herbicide solution．In the northern fores t areas of Fujian Province，application of 200g of effective Glyphosate plus lOOg of effective Krenite，or application of 300g of effective Glyphosate alone．For per mu(1mu=0．15ha)during June to September has Shown a good result and markable economic benefit．It has been confirmed that the technology opens a new way to the southern areas'barren hills afforestation without using the method of burning cultivation．

The method of selecting plus tree using treeS characters Was studied with Pinus sylvestris v&r mongolica．The method consist of three parts：1)elite family selection through progeny test and variance analysis；2)using the method of stepwise regression analysis to pick out some characters which have close relation to the condition of the tree growth and are easy to be measured； 3)establishing the diseriminatory equation and discriminatory index after the discrimillatory analysis finally．The results show that the method discribed above has higher efficiency and more economical．The aceuracy comes up to 71%．The method can also be refered for other species,

Larix potaninii Batalin is the conmon larch of the sub-alpine zone in wes tern Sichuan and south Gansu Provinces，colloquially it is known as the“red 1arch”(hong sha)．Being deciduous this larch is better adapted to cold and dry climates than spruces alld firs．As the altitute increases the larch forests become more and more abundant until finally in the upper edge of forest zone．Being highly intolerant，this larch Can not compete successfully with spruces，firs，and other trees under．Moisture condition within the forest．Zone．So that the forestry nature of larch forest is quite different from that of other conifers．This paper deals with red larch forest which contains five sections，namely：1．The. Distribution and habit；2．The Strueture，growth and productivity of stand；3．The forest types；4．The dynamics of succession；5．The forest management．

The theory of quantification is useful in many subjects.It is necessary to demarcate quantitative variables into category properlu before an application of theory of quantification to solving any problem. The paper illustrated the using of sequntial clustering in order to denarcate quantitative uariable optimally. Itoffers an effective means of division of quantitative variable into category.