A comprehensive analysis was made on the 5 year's successive monitoring findings from the 18 fixed soil erosion monitoring sites of newly established high-yielding timber plantations of 7 main species, such as Larix kaempferi, Cunninghamia lanceolata, Pinus elliottii, Pinus massoniana, Eucalyptus globulus, Pinus caribaea and Eucalyptus urophylla, for the National Afforestation Project loaned by the World Bank, which distributed in 12 provinces or autonomous regions in China.The study showed following conclusions:(1) The afforestation operation would result in soil erosion of the planting site in varing degrees e.g. most(84 %) of the 18 soil erosion monitoring sites show ed extremely slight or slight soil erosion, few (11 %) sites showed middle soil erosion and only one site showed severe soil erosion after the plantation establishment.(2) The site slashing, especially the slash burning, and site preparation, especially the intensive site preparation were the main causes of soil erosion when forest plantation was established.Hence, the runoff and soil loss mainly occurred in the first and second year when planting operation was made.(3) Since the third year (or second year) after the plantation establishment, the soil erosion was significantly reduced to a low level.The runoff decreased to a certain low level and fluctuated in small range with rainfall over years, while the soil loss decreased to an extremely low level and disappeared gradually in the future years.(4) Different site preparation methods would result in soil erosion in different degrees, e.g. the soil erosion occurred at the plantation sites with different site preparation methods varied in the order of overall >strip hole preparation in the first two years after the plantation establishment, with the difference range up to 100 % between overall and strip preparation as well as between strip preparation and hole preparation.(5) The changing pattern of nutrient loss from the plantation land was the same as the soil erosion, i. e. it also occurred mainly in the first and second year after plantation and then decreased or disappeared.Of the total amount of lost nutrients, the loss of soil organic mater and soil total N +P +K took the majority, which were ordered by their lost amount as soil organic mater >soil total N +P +K ≥liquid N +P +K >soil available N +P +K.The to talavailable nutrients carried by the runoff and lost soil, including liquid N, P and K as well as soil available N, P and K.were ordered by their lost amount as total available K >total available N >total available P. However, the total amount of total available nutrient loss was relatively small.It was suggested that site slashing and site preparation methods for plantation establishment should be further improved, such as giving up site slash burning and overall ploughing for site preparation etc., in order to minimize the soil erosion when afforestation operation is conducted.In regard to the lost nutriments caused by soil erosion, a fertilization scheme should be made to replenish the lost available N, P and K to the plantation land.

The study of Chinese fir young plantation soil and water loss for five years has been observed by establishing 16 runoff plots for various means of site preparation, tending measure, interplanting green manure and silvicultural pattern.The results indicated that the order of solid runoff in over-all site preparation >strip-site preparation >hole-site preparation, The soil runoff in hole-site preparation decreased by 40. 33 % in solid runoff of over-all site preparation, and decreased by 25.48 % in solid runoff of strip-site preparation.The solid erosion in different tending measure shows the explanding hole strip tending (98. 695t/hm²)>block tending (92.587t/hm²)>bare land (4.066t/hm²).The block tending decreased by 6. 19 % in soil erosion of the expanding hole strip tending.In different silvicultural pattern of young plantation, water, soil and nutrient loss all show that the traditional pattern >The World Bank type afforestation pattern > ecoty pepattern.The World Bank type afforestation pattern in which loss of water, soil, organic matter and nutrient(N、P、K)decrease by 6.60 %in liquid runoff, 6.08 % in solid runoff, 10.26 %in organic matter loss and 10.36 %in nutrient loss of traditional pattern.It's one of the most effective measure to add to cover planting land surface to prevents soil and water loss by interplanting green manure after controlled burningin in young plantation.

In order to know the effect of the forest of Pinus elliottii under highly intensive management on environment, a consecutive 6-year systematic research of locating monitoring was conducted by taking the newly-built sapling forest of Pinus elliottii as the target and by setting up the field of runoff.The monitoring results showed 6435.3 mm of precipitation during monito ring period, 1611.241 t/hm² of runoff, 2784.4777 kg/hm² of silt loss, 131kg/hm² of the main nutrients as N、P、K, 3.16 %of the runoff coefficient, by building forest of Pinus elliottii in the hilly area of Anhui Province, carrying out large blocked, site preparation(80cm ×80cm ×50cm) and intensive management in order not to cause heavy soil and water loss, the modulus of soil erosion in the year of afforestation was 195.59 t/hm², belonging to the type of non-obvious erosion, thus high-grade site preparation and intensive management can be advocated in this area; May ~ August was the intensive precipitation period, related afforestation activities should be avoided; the soil and water loss was in a relationship of power function with precipitation, with the forest grow th and the restoration of vegetation, the runoff amount gradually decreased, and the silt loss considerably reduced as well.

The 4-year-old masson pine stand was monitored on soil erosion in runoff plots.The results indicated :The water, soil and nutrient loss of forest lands with different site preparation overall-site preparation or hole site preparation was biggest in the first year, 1049.70 t/hm²(runoff), 5.35 t/hm²(soil loss), 12.91 kg/hm²(nutrient runoff) and 410.44 kg/hm²(soil nutrient loss) in the full site preparation plots, 921.20 t/hm², 5.79 t/hm², 10.80 kg/hm² and 467.93 kg/hm² respectively in the hole site preparation plots 1195.50 t/hm², 2.87 t/hm², 8.96 kg/hm² and 200.05 kg/hm² respectively in CK.The runoff loss was reduced year by year from the second year to the fourth year.The runoff loss of plots prepared with 3 types was serious in the first year and light in the fourth year, the runoff loss in the second and third year followed the order:overall site preparation >hole site preparation >CK.All these monitoring results provided a solid base for fast-growing and high-yielding stand establishment and soil fertility conservation.

From 1991 to 1996, the monitoring method of fixed position of runoff plots was used to study the loss amounts of soil, water and its nutrinet of Pinus massoniana Lamb engineering young plantation with different site preparation in Guiping city, Guang xi.The results showed that :Mean amounts of water runoff of Pinus massoniana young plantation with overall preparation, strip preparation and hole preparation was 1348.50 t/hm²·a, 1138.39 t/hm²·a and 1094.91 t/hm²·a respectively.Mean amounts of soil loss with overall preparation, strip prepration and hole preparation was 9.31 t/hm²·a, 4.090 t/hm²·a and 1.917 t/hm²·a respectively. Mean amounts of nutrient loss from soil and water of overall preparation strip, strip preparation and hole preparation was 166.17 kg/hm²·a, 76.27 kg/hm²·a and 39.8 kg/hm²·a respectively, that was 825.1 %, 378.7 % and 197.7 % of shrub and herbaceous respectively.Comparing with before plantation there was a decreasing trend in nutrient content of soil(organic matter, total N, hydrolytic N, and rapidly available K)in the 6-year-old Pinus massoniana young plantation planted with different preparation way s.The total frequecy of decline was 20.4 %, 10.6 %, 5.3 %for overall preparation, strip preparation and hole preparation respectively.The results showed that Pinus massoniana engineering young plantation with hole preparation(40cm ×40cm ×30 cm)has obvious soil and water conservation effects.It is proposed to popularize and apply such site preparation before planting in south area of China.

In order to monitor the impacts of afforestation methods on soil and water losses, one control plot (on the unafforested land) and one or two afforested land plots were established in each of runoff sites during 1991 ~ 1995 in Kuandian and Qingyuan county, Liaoning Province.Annual changes of water, soil and nutrient loss and the relations between loss and the method used for planting and tending were analyzed based on the data record.The results showed that only slight runoff occurred in the afforested land for the first three years and the maximum amount of solid loss was about 196.94t/hm²·a, which was less than the standard loss of 200t/hm²·a in the rock soil of North China and black soil of east-north China according to the National Standard for Grading Soil Erosion issued in 1996.It was further identified that heavey runoff occurred from July to August in Qingyuan runoff plots and amounted to 89.4 %of runoff and 61.7 % of the times of runoff in the whole year.Because the occurrence of runoff was closely related to site character, site preperation and tending method, reducing or enlarging the size of holes and changing the tending time or method could lead to further reduce soil and water losses.

The forest crown interception precipitation, the penetration speed of soil, and the surface runoff of Larix Kaempferi forests in Funiu Mountain in Western Henan Province were measured in this paper.The results showed that the forest crown interception precipitation during the growth period was 185.1 mm and the rate was 24.4 %.It also indicated that the saturation crow n interception was 5 mm.The crown interception increased with increasing of rainfall, but the crown interception rate decreased with it.The penetration speed of soil was about 10 mm·min^-1, the surface runoff coefficient was 11 %~ 20 %, the loss of silt was 7.5 ×10³ ~ 12 ×10³ kg·hm^-2.The penetration speed of soil and the capacity of surface runoff varied with patterns of soil preparation for afforestation.

Facing the present situation of a very large population, arid climate and the serious sand blow by the wind in the plain farming district of Hebei Province in China, we began to plant the fast growing and high yield forests of poplar intercropping with the crops in the sandy waste land where there was a serious sand, in the sandy beach, the second-class cultivated land and the middle-yield and low-yield land in the district from the early part of the eighties, which played an important part in developing and making full use of the land and light energy and increasing the green area and improving the agricultural ecological environment and so on in the district.Temporal and space distribution of microclimate elements, such as temperature, humidity, wind and evaporation, and its effects were analyzed in the poplar-crop intercropping field with different patterns based on the observation data from 1993 to 1997 by artificial and auto meteorological instrument.The results showed that the efficacy of poplar intercropping with crops to prevent wind was 45 %~ 87 %, the average value was 57 %.The poplar-crop intercropping could decrease daily maximal air temperature from 0.3 ℃ to 3.4 ℃ , with an average of 1.3 ℃ .The daily mean maximal temperature of earth surface could be reduced 6 ℃ by means of the poplar intercropping with crops, the maximal temperature reduced was 19.5 ℃ .The daily mean absolute humidity was increased 0.9 hPa~ 2.4 hPa with an average of 1.4 hPa, and the daily mean relative humidity was increased 1%~ 13 %, averaged in 5 %.The water evaporation was decreased from 17 % to 36 %, averaged in 25 %.the poplar intercropping with crop could make the continued time of the relative humidity < 30 %short 4.5 h on a dry hot wind day.Therefore, the poplar intercropping with crops has the obvious functions of wind-proof, dropping temperature, increasing humidity, and decreasing evaporation, which have significance for improving the field micro-climate and ecological environment of agriculture, and promoting high-yield and stable-yield of agriculture.

The runoff in newly planting high-yielding and fast growing plantation of Chinese fir was observed for 5 years.The results indicated that soil and w ater loss as a result of site preparation before afforestation mainly occurred in the first and second years.The liquid runoff of the fixed sample plot amounted to 9 %~ 10 %of the total rainfall in the first year，and then decreased gradually.The solid runoff mainly happened in the first and the second years，reduced obviously in the third year，and there was no solid runoff in the fourth year.

According to requirement of the National Afforestation Project assisted by the World Bank，the soil erosion monitoring installations had been installed and observed on January 1 1992 in demonstration forest land of slash pine.The observation show ed that lost amount of water and soil and nutrient was at maximum in the first year after planting and decreased with the increase of planting time.There were no significant difference between treatments with different measures.The range of runoff in both planting plot and non planting plot was 179.9 ~ 28.0 t·hm ^-2·a^-1 and the soil loss was 73.1 ~ 3.4 kg·hm ^-2·a^-1 in four years，which was lower than the permissible lost of national standard in these areas.The tree grow th of slash pine exceeded the standard of high-yield-forest.It was proved that the dominant factor of influencing the soil and water losses was the disappearend and recovering of vegetation in a area.In the monitoring demonstration forest，the trees grew well so that the aim of cultivating forest and protecting environment was obtained.

A comprehensive analysis was made on the 5 year' s successive monitoring findings from the 34 fixed soil fertility monitoring sites of newly established high-yield timber plantations of 10 main species, such as Larix kaempferi, Populus tomentosa, Populus × euramericana, Cunninghamia lanceolata, Pinus massoniana, Pinus taeda, Pinus elliottii, Pinus caribaea, Eucalyptus globulus and Eucalyptus urophylla, for the National Afforestation Project, financed by the World Bank, which distributed in 13 provinces or autonomous regions in China.The analysis results showed the following conclusions :(1) The soil fertility indexes vary in different scale and tendency after plantation establishment.In general, the soil available nutrients, such as the content of available N, P and K in the soil changes significantly while others, such as pH and the content of organic matter and total Netc.change little over years after plantation establishment, that is to say, the afforestation has greater impacts on the soil available nutrients of plantation land.(2) For the plantations or Eucalyptus, Pinus or Cunninghamia lanceolata grown at relatively poor sites, the content of soil available N, P, K decreased over years after plantation establishment, of w hich the content of soil available Phad most significant reduction w ith average annual decrease of 30 %, while for the plantations of Larix kaempferi, Populus as well as Pinus and Cunninghamia lanceolata grown at relatively good sites, the content of soil available N, P, K had no significant reduction or even a little increase over years after plantation establishment.According to the change pattern of soil available nutrients of the plantation land over years after plantation establishment, the plantation land can be divided into two types.One is called "soil available nutrient decreasing type" (or SAND type), i.e., the content of soil available nutrients will decrease significantly over years after plantation establishment.The other one is called "soil available nutrient stable type" (or SANS type), i.e.the content of soil available nutrient has almost no change or little increase over years after plantation establishment.(3) For the plantation land of SAND type, the content of the decreased available nutrient elements in the soil could be raised in a larger scale by application of fertilizers, while for the plantation land of SANS type, the content of the available nutrient could still be raised but in a sm aller scale.(4) The content of available N, P and K in the soil of the plantations bland with fertilization increase more or less, but the content of available P in the soil has the most significant response to the application of P fertilizer, because there is the largest decrease in rate over years after plantation establishment when without fertilization, comparing to the content of available N and K in the soil.Therefore, the fertilization should be strengthened for the plantation land w ith SAND type, so that the content of soil available nutrients can be significantly improved and the fertilization can be more effective.

A comprehensive analysis was conducted on the long-term observation data from the five groups of runoff plots set up in Chinese fir young plantation at the Experimental Center of Subtropical Forestry, CAF in Fenyi, Jiangxi.The results showed that the range of surface runoff was 1.47 ~ 13.22mm with average of 5.46 mm, the range of runoff coefficient is 0.098 %~ 0.852 % with average of 0.369 %, the range of soil erosion is 0.0051 ~ 0.2510 t/hm² a year with an average of 0.1005 t/hm².During the w hole juvenile stage of the plantation, the total surface runoff is 546.0m³/hm², the total soil erosion was 1005.0 kg/hm², the nutrient loss was 1.9560 kg/hm² for N, 2.2370 kg/hm² for P, 26.777 kg/hm² for K, and 50.049kg/hm² for organic mater.We conclude that for the sites with red or yellow soil derived from shale, especially with the well structured soil and thick humus layer, it has strong resistance to soil erosion, and there are no significant influences on soil erosion no matter what the ways are adopted in sites preparation. Comparatively speaking, the hole site proparation way is better than others.Therefore, soil erosion may not be the main reason for the site fertility degradation of Chinese fir plantation at the sites with this type of soil.

The trial of soil fertility monitoring was carried out in Chinese fir woodland at Zhongchao(25°44′to 26°31′N latitude, 108°37′to 109°31′E longitude, Altitude 500 to 670 m), Located in Liping Countv, Guizhou Province. The trial area was 1.44 hm². The trial resuits were as follows:1. After fertilization, the chemical and physical properties of soil in Chinese fir woodland improved apparently. In the second year after fertilization, the contents of available P in the P₂ treatment and the P₂K₁treatment increased 13% and 21% respectively, compared with control, while the content of the availableK and the slowly available K increased 20% and 19.5% respectively comparing with control. In the fourthyear after fertilization, the content of P in the treatment of P₂ and P₂K₁ increased 25% and 28% comparing to control, and the rapidly available K and the slowly available K in the P₂K₁ treatment increased 21% and 29% respectively.2. The soil fertility of Chinese fir woodland decreased year by year after planting. In the fifth year after planting, the decline proportion of N, P and K content in the soil located at 40 cm from the trunk, was lower than that in the soll which was 80 cm from the trunk.

Effects of fertilizer application of P and PK on soil properties and foliar nutrients of young stands of loblolly pine(Pinus taeda) and slash pine (P.elliottii) were studied during 1991~1995 on the site of red earth derived from phyllite in the hilly land of Jingdezhen City of Jiangxi Province. The results showed that: (1)Rapidly available P content of soil increased while organic matter and other nutrients decreased in the soil of both stands after the fertilization of P and PK; P application could facilitate the mineralization of organic matter and the absorption of N. (2) P and PK application could increase the numbers of bacteria, fungi and cellulose-decomposing bacteria but reduce actinomyces in the soil of slash pine and stimulate aerobic nitrogen-fixing bacteria and phosphobacteria at the early stage of fertilization while inhibit at the later stage. (3) P and PK application could also improve activities of soil urease and catalase, and inhibit soil phosphatase at the early phase of fertilization but release its activity at the latter phase; sucrase activity could be improved by P application while inhibited by PK. (4) P and PK application could significantly increase Ca and Mg after two years from fertilization but reduce N content in the needle of slash pine, and there was no significant effect on P and K content in the needles.

This paper deal with the effect of fertilization for 4 years on the changes of the soil nutrients, the soil water-physical characters and the soil microbes in the poplar plantation. The result showed that in the best treatment(100 kg N/hm²+100kg P₂O₅/hm²) of fertilization the content of organic matter, total N, rapidly available N in the soil, was increased by 21%, 60% and 14% respectively compared with control. But there was little effect on the total P, rapidly available P and physical-water characters in the forestland. The analysis of soll microbes showed that fertilization could increase 37.7% of the total amount of the soil microbes than that before plantation, thus strengthen the activities of soil biochemistry, and promote the forest grew up better. The severe influence on the physical-chemical properties of soil and the eco-logical environment can not result from a suitable fertilization.

A test of the effects of fertilization was done with fertilizing the ordinary N, P, K elements from 1991~1995 in several experimental areas selected from three representative site types of Soil in Jianghan plain, Hubei Province. The results shows: Overall significant effects of single N element; Overall bador not better effects of single P or K element, even a significantly negative effect in wet clay soil of theplain(siteⅠ)which is only suitable for single N element; The best effect of mixed N and P elements in theplain alluvial soil(site Ⅱ)and sedimentary soil in the lake region(site Ⅲ); The best application rate(total): 400kg N/hm² for siteⅠ; (200kg N+100kg P₂O₅)/hm² for site Ⅱ; (100kg N+100kgP₂O₅)/hm²for site Ⅲ; fertilizers are urea for N, calcium superphosphate for P₂O₅, respectively; 35%~75%increment in growing stock, which is equal to increasing 6~11 thousand yuan/hm² in total within five years(1991~1995).

Soil fertility and growth increment of Pinus massoniana Lamb. trees were monitored for 5 years in a young stand located in Fenyi county, Jiangxi Province. The results showed that the effect of fertilization with K was not evident, but that was better with P. The content of total P in soil in the second year, in the third year, and the fifth year after fertilization increased 18.2%, 18.1%, and 43.1% respectively, compared with control. The height, DBH and volume of forest trees in the plot fertilized with P yearly increased 3.0%, 16.7% and 9.7% comparing with control, suggesting positive effect of P fertilizer applied in the hill and mountainous districts with red soil.

Monitoring of soil fertility in Eucalyptus 12ABL plantation was based on the fertilization test, which continued for five years. The tseatment 1 (N₁P₁K₁), 8 (N₃P₃K₁) and 9 (N₃P₃K₂) were selected as the monitoring sites from 9 different fertilizer plots. The investigation results were as follows: The pH value in the soil reduced from 5.17 before planting to about 4.6, and the organic matter content of soil changed slightly, which was lower in the treatment 1 than in others. The total N contents of the soil were lower than before planting in all treatments. The total P contents of the soil were similar to the background, and the K contents of the soil in the treatment 8, 9 were higher than before planting, but which was lower in treatment 1. The available N contents of the soil were lower after planting than before planting, especially in the treatment 1. The available P content of soil decreased after planting in the treatment 1, which was similar to background in other treatments. The available K contents of soil were higher after planting than before planting in all treatments, which was more obvious in the treatment 9. The exchangeable Ca contents of the soil in the treatment 8, 9 were lower after planting than before planting, especially in the treatment 9. The highest current increment in height growth occurred in the second year after planting for the treatment 9, which was in the third year after planting for the treatment 8, and treatment 1. The litter was positively correlated to the tree increment. The pulpwood produced per hectare was 2073.55 kg, 4807.88kg, and 5054.52kg in the treatment 1, treatment 8, and treatment 9 respectively. The monitoring result showed that Eucalyptus growth was related to the environment, especially it was closely related to the soil habitat.

The results of soil monitoring in the fourth year of plantation indicate that afforestation with Chinese fir leads to the decrease in contents of organic matter, rapidly available phosphorus, rapidly available potassium, hydrolytic acid, exchangeable Mg²⁺, moreover leads to the decrease of pH value, so that, the soil fertility of forest land tends to degeneration, however fertilization can avoid soil degeneration and improve soil fertility of the forest land. When calcium magnesium phosphate is used as base fertilizer, soil fertility indexes, such as organic matter, rapidly available nitrogen, rapidly available phosphorus, rapidly available potassium, exchangeable Ca²⁺, exchangeable Mg²⁺ and the pH value can be increased. The results also show that the increase of soil fertility indexes is related with the amount of calcium magneaium phosphate applied. The contents of the 5 main nutrients in leaves of Chinese fir sapling are related with the season and the stand age. The contents of all the nutrients in winter are higher than those in summer, as the age of stand increases, the content of total nitrogen decreases while that of total phosphorus, total potassium, total calcium, total magnesium increases.

A comprehensive analysis was made on the 5 year's successive monitoring findings from the 62 fixed forest pest monitoring sites of newly established high yielding timber plantations of 15 main timber tree species,such as Larix kaempferi,Ulmus pumila,Robinia pseudoacacia,Paulownia sp,,Populus tomentosa,Populus×euramericana,Cunninghamia lanceolata,Pinus massoniana,Pinus taeda,Pinus elliottii,Pinus caribaea,Eucalyptus globulus,Eucalyptus urophylla,Eucalyptus grandis ×uraphylla and Eucalyptus ABL12,under the World Bank Loan Afforestation Project,which distributed in 16 provinces or autonomous regions in China. The analysis results showed following conclusions: a. At the forest pest monitoring sites with plantations of 15 tree species,the plantations of 14 species,except Larix kaempferi,occurred some insect pests and the plantations of 11 species,except Larix kaempferi,occurred some diseases. Comparatively,the plantations of Pinus massoniana,Pinus taeda,Populus tomentosa and Populus×euramericana had relatively frequent occurrence of insect pests and the plantations of Pinus massoniana,Pinus taeda,Populus tomentosa,Populus×euramericana,Eucalyptus ABL 12 and Eucalyptus globulus had relatively frequent occurrence of diseases. b. According to statistics on the percentage of the observations with occurrence of insect pest or disease occupying the total observations at the monitoring sites of given plantation species,i.e. the observation occurrence rate,and the percentage of the monitoring sites with occurrence of insect pest or disease occupying the total monitoring sites of given plantation species,i.e. the sites occurrence rate of each species or kind of insect pest or disease,the most frequently or frequently occurring insect pests or diseases of each given plantation species were identified,which provid clear target for the effective control of forest pests. c. Among all observations conducted at all monitoring sites,the observations with occurrence of insect pests occupied 77.7% while the observations with occurrence of diseases occupied 27.1%. The statistics of the damage degrees to the plantations caused by insect pests or diseases indicates that among all observations with insect pest occurrence,extremely few observations (2.5%) showed severe damage,few observations (8.86%) showed middle degree damage and most observations showed slight or no damage to the plantation stands,and among all observations with disease occurrence,still extremely few observations (6.08%) showed severe damage,few observations (11.6%) showed middle degree damage and most observations showed slight or no damage to the plantations. Therefore,the overall insect pest or disease damages to the project plantations were slight. However,for some plantation species the emphasis should be given to the prevention and control of the insect pests or diseases causing severe damages. It was suggested that the list of frequently occurring insect pests and diseases,especially,the severe damage causing insect pests or diseases should be paid much attention by the forest managers and the appropriate control strategy should be made for them.

This paper reports the relationship between the outbreak of Anoplophora glabripennis (Motsch.) and management level of poplar forests,the selection of laying eggs to the thickness of host and the prediction of adults and larvae occurrence period. The result showed that damaged level of street trees is the most serious,and that of fast growth and high quality forests is the most slightly,the damaged rates of them are 85% and 7% respectively. The most suitable thickness of branch for adults laying eggs is 8~16cm. The emergence peak of adults is from 20 July to 20 August,it is the most suitable period to control adults. The hatching peak of larvae is from 20 August to 20 September,and this is the most appropriate period to control larvae.

The population of the glabrous spotted willow borer declines rapidly in the NAP popular intensive management plantations and the damage to farmland sheltbelts,fourside scattered grown trees and different clone plantations was got through the fixed location monitoring in Shandong Province.The result indicated that the reasons made the population of the borer declining rapidly in the intensive managed stands are the rotation period shortening eliminating pest source stands,variaties changing fast and various clones planting refraining the adaptability of the borer to poplar clones,the environmental conditions of plantations and intensive management measures destroying the suitable surroundings of the borer's reproduction and growth.The community of the borer was controlled at the lower level in NAP poplar intensive management plantations in Shandong Province.

There are 16 and 8 species of insect pests and their nature enemies of 1~5 year old plantation of Pinus massoniana. The rates of the trees damaged and the main shoots damaged by Dioryctria rubella Hampson reached 12.0% and 7.2% respectively in 5 year old plantation of Pinus massoniana. The height growth of the current year damaged main shoot was 0.1m shorter than that of the healthy main shoot. The damage rate of height growth reached 14.7%. Dioryctria sp. bored the trunk,caused the pine tree die,the tree damaged rate reached 3.2%. This paper also represents parasitic habits of two important natural enemies of insects,Macrocentrus watanabei van.Achterberg and Apanteles sp.