Table of Content

28 February 2019, Volume 0 Issue 1

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Integrated Management and Administration

Discussion on Natural Resources Asset Management in National Parks

HAN Aihui

2019, 0(1):  1-5.  doi:10.13466/j.cnki.lyzygl.2019.01.001

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The paper analyzes the problems that need to be solved in national park management and natural resource asset management,proposes that natural resource asset management is the core content in national park management. Natural resource asset management in national parks should be based on the inventory of natural resources,the national park master plan and the property rights management and guaranteed by supervision and law enforcement.Then,land usage control,protection activities and proper utilization can be carried out. The paper also suggests some relevant policies.

Review on China’s Plantation Development Since the Reform and Opening Up

WANG Yunlin

2019, 0(1):  6-11.  doi:10.13466/j.cnki.lyzygl.2019.01.002

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Since the reform and opening up,China’s plantation area and volume have increased continuously and steadily for 40 years.This paper expounded the main measures and experiences in the process of plantation construction.Based on the analysis of multi-stage national forest resources inventory data,it pointed out that there were still some deficiencies in the development of artificial forests in China,such as low forest quality,weak ecological stability,increasing pressure on resource conservation,harsh condition of the lands for planting,and arduous tasks of forest tending.In addition,suggestions from five aspects were proposed,including improvement of the management system and technical support of plantation development.

The Distribution and Historical Changes of Ungulate Animals in Inner Mongolia Plateau

Sarula , ZHANG Rong, GAO Runhong

2019, 0(1):  12-18.  doi:10.13466/j.cnki.lyzygl.2019.01.003

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There are thirteen kinds of hoofed animals in Inner Mongolia Plateau,including of four families,ten genes and thirteen species.Roe deer and red deer habitate in the ecotone between grassland and forest,the Tibetan gazelle,blue sheep,argrali sheep and aipinelbex dwell in the mountains and hills of the plateau.However,mongolian gazelle,przewalskis gazelle,goiterd gazelle,tibetan gazelle,mongolian saiga,mongolian ass,mongolian horse and wild camel are the typical hoofed animals in Mongolian Plateau.It has been a giant change for the kinds and numbers of hoofed animals in the Mongolian Plateau since modern times.przewalskis gazelle,goiterd gazelle,tibetan gazelle,mongolian saiga,and mongolian horse have disappeared from Mongolian Plateau,the other hoofed animals population has gone down quikly.The main reasons for the hoofed animals population decline is that the people disturbance,such as reclaiming and cultivating grassland,fencing forage,overuse of water resources,etc.Thus,to protect the hoofed animals in Mongolian Plateau,we should set up a national park system and ecological space for the hoofed animals.

Analysis of the Changes of Poplar Resources and the Causes in Shandong Province

ZHANG Jinliang, KONG Yuguang, LU Hongchun, GONG Yanping, ZHANG Xueqiang, DONG Dejin

2019, 0(1):  19-24.  doi:10.13466/j.cnki.lyzygl.2019.01.004

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The research was based on the data of the last six forest inventories Shandong Province conducted between 1992 and 2017.With the analysis of the changes of land use,tree species and age in the poplar sample plots,it was found that the land used for planting poplar trees was mainly non-forestry land,especially farmland.The stability of the poplar forest resources was poor because most of poplar trees were cut down within 10 years after they were planted.Consequently,the poplar forest land was mainly transformed into the non-forestry land,especially farmland.And the above-mentioned transformations happen very frequently.In this article,the influence on forestland stability with the forest renewing and felling is explored and it has important significance to scientifically guide the management and cultivation of forest resources.

The Influence of Forestland Transfer Period on the Production Input of Bamboo Forest

CAO Chang, LI Lanying, TONG Hongwei, HUANG Haiyong, ZHU Huifang

2019, 0(1):  25-31.  doi:10.13466/j.cnki.lyzygl.2019.01.005

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Forest resources are abundant in the south of China,and forestry is an important source of income for farmers in the collective forest region.As the main manager in the collective forest area,the farmers' management investment behavior plays an important role in the development of forestry.There are many influencing factors that affect the behavior of forestry production input.However,as one of the influencing factors,the forestland circulation period has an important influence on the investment of forestry production.To stabilize the forest land circulation,improve the level of intensive management of woodland resource in Zhejiang province to provide reference for forestry development and farmers' income,this article,based on the sample survey data in Zhejiang province and using multiple linear regression,analyses the influence of the forest land transfer period on the bamboo forest production inputs.The research results show that the influence of the transfer period on bamboo forest production input presents an inverted U type.When the transfer period is 38 years,the farmers production input of bamboo forest is the biggest.

Scientific Research

The Relationship between Herbaceous Biomass and Soil Factors of Sunny Slopes in the Mountains of Northern Hebei

YU Shitao, FU Jinchi, JIANG Lingling, MA Rong, XU Zhongqi

2019, 0(1):  32-37.  doi:10.13466/j.cnki.lyzygl.2019.01.006

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In order to study the influence of soil characteristics on herbaceous vegetation layer in mountains,the correlation between herbaceous biomass,herbaceous plant diversity and soil factors in arid sunny slopes of mountainous areas in northern Hebei was studied.The results showed a clear correlation between the herbaceous biomass and herbal height(r=0.351,P<0.01,n=132);herbaceous biomass and soil thickness has a significant positive correlation(r=0.351,P<0.01,n=132)(P<0.01),herbaceous biomass and stone coverage has a clear negative correlation(r=0.297,P<0.01,n=132),but no significant correlation with soil nutrient.There was a negative correlation between species richness and soil nutrients,but it was significant only for total nitrogen,available phosphorus content.It is concluded that the soil thickness plays a great role in herbaceous biomass in arid sunny slopes of mountainous areas,and soil nutrient is not the limiting factors in herbaceous production,while high soil nutrients lead to decrease in species richness.

Ecological Benefits of Vegetation Restoration in Yijinhuoluo Banner of Inner Mongolia

JIANG Liwei, LU Zeyang, GONG Yinting, YAN Shiwei

2019, 0(1):  38-43.  doi:10.13466/j.cnki.lyzygl.2019.01.007

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Vegetation restoration is the current research hot topic at home and abroad.This paper studies the nearly 15 years of vegetation restoration in Yijinhuoluo Banner.Based on constructing an evaluation index system for the local natural environment characteristics of vegetation restoration,the ecological benefits in Yijinhuoluo Banner,benefits of water conservation,soil condition,environment purification efficiency are analyzed and the overall ecological results of vegetation restoration summarized.The results show that the forest coverage rate of the whole Banner is 36.35% at present and the vegetation coverage rate is 88%.In the land of vegetation restoration at 0~30cm,the soil porosity increases,the nutrient content increases and the density decreases.The overall ecological value of Yijinhuoluo Banner could reach 1.94 billion yuan /a,an increase of 297% over that before vegetation restoration.

Effects of Thinning on the Growth of Different Age Class Pinus taiwanensis Plantations

QIU Lin, ZHANG Jianshe, ZHENG Tiancai, WANG Xiaoyun, ZHOU Chuantao, DONG Huihui, LI Fengying, LIU Yong

2019, 0(1):  44-51.  doi:10.13466/j.cnki.lyzygl.2019.01.008

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With the Pinus taiwanensis plantation in the multi-functional forest management sample base of Huangbaishan Forest Farm as the object,the randomized blocks were used to set up the fixed sample plot,and the first thinning test was carried out in the young forest,including the intensive thinning(45%),moderate thinning(34%),weak thinning(23%) and control(no thinning).When the Pinus taiwanensis plantation entered on the age of the half-mature forest,near mature forest,and mature forest,the second,third and fourth thinning tests were carried out in succession,and all were carried out on the basis of the previous thinning,in which the intensive thinning(30%),moderate thinning(20%),weak thinning(10%)and control(no thinning) were done.Study was conducted on the effects of different thinning intensities on the growth of Pinus taiwanensis plantations at different ages during the cultivation period of Pinus taiwanensis plantations.The results showed that:(1)In the same age class,the growth rate of DBH,tree height,volume of individual tree,basal area and volume increased with the raising of thinning intensities.(2)The intensive and moderate thinning of young forests,and the intensive thinning of half-mature forests and near-mature forests significantly promoted the growth of DBH.The thinning of mature forests did not significantly promote the growth of DBH.(3)In any age class,thinning had no significant effect on growth of tree height.(4)The intensive and moderate thinning of young forests as well as the intensive thinning of half-mature forest and near-mature forests significantly promoted the growth of volume of individual trees,and the thinning of mature forests did not significantly promote the growth of volume of individual trees.(5)The basal area of residual trees was reduced with the increase of thinning intensities,and thinning had no significant effect on the total basal area.(6)The volume of residual trees was reduced with the increase of thinning intensities,and thinning had no significant effect on the total volume.As far as the management of Pingus taiwanensis plantation is concerned,after the young forest section of the forest was closed,the first thinning begins,and the intensity and moderate thinning are appropriate;The second and third thinning operations of middle age forest trees and near-mature forest trees are carried out,mainly by intensive thinning;The fourth thinning of mature forest section has no significant effect on the growth of Pinus taiwanensis forest and can be abandoned.

The Influence of the Step-change of Slope Position on the Growth of Castanopsis hystrix

GUO Wenfu, HAO Jian, WEI Juling

2019, 0(1):  52-56.  doi:10.13466/j.cnki.lyzygl.2019.01.009

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Linear sampling plots were set up with a 14 years old plantation of Castanopsis hystrix in Fubo Experimental Station of Experimental Center of Tropical Forestry,Chinese Academy of Forestry in Guangxi,China.The effects of small scale slope level and microchange on tree growth and soil properties were studied to provide precise techniques for the selection of afforestation site for the cultivation of large diameter timber of valuable tree species.The result showed that:(1)the tree height and DBH decreased with the increase of slope position,and the influence of different slope positions on tree height and DBH was significantly different;(2)Soil nutrient elements,pH and soil organic matter were negatively correlated with slope height.That is,the higher the slope position,the smaller the value of each index,and the difference of pH,total P and K content between different slope levels reached a significant level;(3)Under the mild soil drought in spring,the difference of water content among different slope levels was not significant.It is suggested that according to the difference of site conditions of water and fertilizer for different tree species,different tree species should be arranged in the upper and lower slope positions when the slope length is more than 60m,and different tree species should be arranged in three slope positions when the slope length is more than 100m.

Comprehensive Evaluation of Soil Fertility of Cunninghamia lanceolata Ecological Public Welfare Forests in Different Age Groups

SUN Yu, LI Jiping, CAO Xiaoyu, XU Zhanyong

2019, 0(1):  57-62.  doi:10.13466/j.cnki.lyzygl.2019.01.010

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In order to study the soil fertility between the transformed and untransformed stands of Cunninghamia lanceolata ecological public welfare forests in different age groups,the young,middle-aged and near mature forest of Cunninghamia lanceolata in Fushou Forest State-owned Farm of Hunan Province was taken as object of study and the Analytic Hierarchy Process(AHP) was used to evaluate the soil fertility of management plot and control plot in different age groups.The results showed that the three criteria of the soil fertility evaluation of Cunninghamia lanceolata ecological public welfare forest in Fushou Forest Farm are soil environmental conditions(0.106 2),soil physical properties(0.206 5) and soil nutrients(0.633 3). There were 9 sample plots with poor level soil fertility grades in 18 plots,all of which were control sample plots,and 8 plots were middle level,all of which were management plots,with a good level plot,there were no poor and excellent level plots,and the proportions of poor,medium and good level plots were 50%,44.4% and 5.6% respectively.The soil fertility scores of the three age groups were middle-aged forest > near-mature forest > young forest,and the scores of the control plots and the management plots of the different age groups were significantly different.The soil fertility scores of the management plots were higher than the control plots,showing that thinning and replanting of native tree species can improve soil fertility.

Study on Relationship between DBH and Crown Diameter of Pinus densata and Its Application in Southeastern Tibet

WANG Xiaolan, CHEN Jiarui, XING Zhen, ZHANG Chuanlong

2019, 0(1):  63-69.  doi:10.13466/j.cnki.lyzygl.2019.01.011

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2 041 standing trees were measured from 56 sampling plots in Milin County,Bayi District and Bomi County,where is the major distribution area of Pinus densata in Tibet.The aim of this study was to establish the relationship of diameter at breast(D)and crown diameter(Cd)of P.densata natural forest in the southeastern Tibet.The result showed that the Cd had a significant correlation with the D.The optimal regression model of Cd with D was Cd= -0.001D²+0.244D+0.184.The Cd/D ratio decreased as D increased,and dropped rapidly at initial stage(D=0~20 cm),beginning to stabilize at around 20 in trees bigger than 20 cm dbh.The optimal regression model of Cd/D with D was logarithmic function Cd/D=-4.473ln(D)+36.098.Besides,according to the regression of Cd and D,the optimal management density table under different diameter classes has been established.It not only helps to determine the thinning intensity but also provides references about tree number in the afforestation design and forest management planning in this region.

Analysis on the Change of Forest Land Types in The Xinjiang Altai Mountain Natural Forest Protection Project Area from 2000 to 2016

LIU Yang, XIAO Zhongqi, ZHANG Huaiqing, YAO Bo, HUANG Jianwen

2019, 0(1):  70-77.  doi:10.13466/j.cnki.lyzygl.2019.01.012

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The Natural Forest Resources Protection Project in Xinjiang was launched in December 2000. It has lasted for 16 years as of the research period. This study provides data support for monitoring the changes of forest land area and types,exploring the changing trend of forest area,objectively evaluating the implementation effect of the natural protection project in the region,and implementing the protection and management measures in the next stage of forest area. Such methods as the area of woodland,sparse woodland,shrub woodland and other types of land were used to reflect the changes of forest land types. Based on the data of Landsat7 ETM + in 2000 and Landsat8 OLI in 2016,the regional distribution of forest land type change,the trend of forest land type change and the causes of change were analyzed by using maximum likelihood classification and confusion matrix. In 2016,the overall classification accuracy was 90.68%,and the Kappa coefficient was 0.87. The results showed that:(1)from 2000 to 2016,there was an increase in woodland area:35 234.2 hm²;(2)The area of sparse woodland decreased by 252 355.2 hm²;(3)The area of shrub land increased by 244 606.3 hm²,and other types of area increased by 27 485.2 hm²;(4)compared with the same period in 2000,the change trend of forest land area in 2016 was as follows:the forest land area in Aletai Branch increased by 9.6%,Burjin Branch increased by 11.7%,Fuyun Branch increased by 5.9%,Habahe Branch increased by 20.8%,Fuhai Branch increased by 22.9%,Qinghe Branch increased by 12.5%,but the area of forested land in Two-river Source Nature Reserve decreased by 7.5%. The forest land change in Natural Forest Protection Project(NFPP)area shows a good development trend in general,and the results of the implementation of NFPP are good obviously. However,the distribution of forest land types in forest areas is still unbalanced. The proportion of woodland and sparse forest land is small. The proportion of other types of forest land and shrub land is large. The protection of sparse forest land should be strengthened in future forest protection projects.

Application of UAV Remote Sensing in Measuring Canopy

QIAO Zhengnian, MA Jun, XU Yannan

2019, 0(1):  78-84.  doi:10.13466/j.cnki.lyzygl.2019.01.013

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UAV remote sensing technology provides a fast measurement method for forest crown acquisition.Taking the Dongtai Forest Farm as the research area,we manually measured the single-wood crown amplitude of the poplar plantation plot,used the UAV remote sensing technology aerial survey to obtain the high-definition image map corresponding to the poplar plot and used Agisoft PhotoScan software to sample the image.The splicing modeling was carried out,and the amplitude of the single-wood crown of the sample was quickly extracted by using ENVI software.The crown amplitude values obtained by the two methods were compared and fitted to obtain a linear regression model.The correlation coefficient of the two was R=0.89,the root mean square error.RMSE=0.60,relative error RE%=7.93%,the model fitting effect is better.The results show that it is feasible to measure the single-wood crown by the remote sensing technology of the drone,and the estimation accuracy is high.Compared with the manual field measurement,the cost is lower,the time is shorter,and the flexibility is higher.Certain work advantages are worthy of being widely promoted.

The Ecological Sensitivity Analysis of Paoling Mountain Park in Shanghang County Based on GIS

WANG Jiali, HU Xijun, CHEN Cunyou

2019, 0(1):  85-92.  doi:10.13466/j.cnki.lyzygl.2019.01.014

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Ecological sensitivity analysis is of important significance to urban ecological park construction.In this paper,the ecological sensitivity of Paoling Mountain Park in Shanghang County is studied by using GIS and AHP.Nine evaluation factors were selected for ecological sensitivity evaluation.The results show that high sensitive area and higher sensitive area occupy 70.89% of the total area,mainly distributed in the “XiAn Mu Di” scenic spot in the north of the park and the “Pao Ling Chao Yun” scenic spot in the south,which indicates that the overall ecological sensitivity of the region is high.Finally,according to the analysis results,corresponding protection measures are put forward for various sensitive regions,and an ecological framework is constructed for the sustainable development and planning of Paoling Mountain Park in Shanghang County.

Simulation and Technical Realization of Forest Scene Based on Northeast Second Class Survey and Special Tree Species Data Collection

GAO Jinping, GAO Xianlian, YU Huina, SUN Zhongqiu, LIU Bin, YANG Baohui, TIAN Xiaomin

2019, 0(1):  93-100.  doi:10.13466/j.cnki.lyzygl.2019.01.015

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The implementation of the small-scale zoning and survey results of forest resources to the plot level has become the basic requirement for the modern management of forest resources.However,how should we make forest resources growing on the small-scale plots realistically “stand up” and be intuitive without going to the field? It is a technical problem that forest resource managers have always been concerned about.With the maturity of 3D geographic information management technology,virtual reality technology and massive data processing technology,tree species modeling and large-scale scene forest modeling research have emerged,but it is impossible to describe the multi-species parameters of tree species growth structure and shape characteristics.Most of these studies are stuck in the model efficiency.They are mainly applied to virtual animation scenarios,but cannot practically be applied to forestry production guidance practices.Based on the 50 tree species(including shrubs)in the field survey in Northeast China,we used Onyxtree modeling tools to carry out fine modeling of tree species,and used the forest resources planning and design survey results display platform in the key national forest areas in Inner Mongolia.The complex forest scenes are quickly displayed,and the dynamic consistency of important display features such as tree species,plant number,coverage,age structure,tree height,and undergrowth and field survey results are realized,and forest resources of key national forest areas in Inner Mongolia,China,are initially completed.

Study on Forest Change Detection Method Based on Remote Sensing Data

ZHAO Xun, YUE Cairong

2019, 0(1):  101-108.  doi:10.13466/j.cnki.lyzygl.2019.01.016

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Forest resources management inventory is generally conducted every ten years,and the annual data updating is a technical problem that the forest resource management department urgently needs to solve.This study uses object-oriented approach to update the spatial informationof forest sub-compartment data based on the combination of the sub-compartment data and remote sensing technology.Taking Hutiaoxia township in Shangri-La as case study,this paper chooses the SPOT5 image in December 2008 and the forest resources management inventory data in 2006 to extract the forest land change information.The results show that the method can implement the rapid update of the spatial information of the forest resource management inventory data,objectively reflect the change information of the forest land,and meet the needs of the forest resource management department for the rapid extraction of forest land change information.

Dynamic Analysis of Landscape Pattern of the Plateau Wetland of Zoige County

MA Hua, WANG Yifei, NING Yu, WU Gaojie, GUO Julan, TAN Yuechen, LI Chunyi, LIN Haiyan

2019, 0(1):  109-115.  doi:10.13466/j.cnki.lyzygl.2019.01.017

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In this study,3 Landsat satellite images at the end of summer of 2000,2010 and 2016 in Zoige County were taken as the main data source.With the support of remote sensing image processing software(ArcGIS 10.2 and ENVI 5.3)and landscape analysis software(FRAGSTATS 4.2),the characteristics of landscape pattern change,the conversion between various landscape types and landscape index change in Zoige County from 2000 to 2016 were analyzed by using the theory of landscape ecology.The study indicated that,1)from 2000 to 2010,the frequency of transformation between patch types in the study area was relatively high,mainly reflected in the conversion of other landscape types to grassland,the area of marsh and lakes began to shrink,and the landscape like sand and desert became grassland on a large scale.2)From 2010 to 2016,the variation trend of landscape transformation was significantly reduced,and the area of marsh and lakes was restored.3)Overall,the basic landscape pattern of the study area did not change significantly,grassland was the most dominant landscape type in the study area,the area and heterogeneity of roads and residences continued to increase.

Prediction of Forest Fire Occurrence in Daxing’an Mountains Based on Logistic Regression Model

CHEN Dai

2019, 0(1):  116-122.  doi:10.13466/j.cnki.lyzygl.2019.01.018

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Based on the satellite data of forest fire from 2000 to 2016,this study selected such factors as meteorology,topography,vegetation,fuels,human activities and other factors as forest fire prediction variables,used Logistic regression model to analyze the main driving factors of forest fire occurrence,and established a forest fire prediction model in Daxing'an mountains.The results showed that the Logistic regression model has a high prediction accuracy of 80.6%,and the goodness-of -fit of the model is 0.868.In general,the fire risk is high in the south and east but low in the north and west.The residual analysis results showed that there large areas were underestimated in the south and southeast,indicating that the prediction ability of the model for these areas was low.

Research on Recreational Resources Evaluation and Improvement of Qiandao Lake National Forest Park

HUANG Shuping, GE Hongye, LIU Fenfei, WANG Minhua, DONG Jianwen

2019, 0(1):  123-128.  doi:10.13466/j.cnki.lyzygl.2019.01.019

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By collecting the online travel commentary on a tourism network platform,the text is coded and factor graded.The importance-performance analysis method is used to obtain the importance and satisfaction of tourists on the resources of recreation resources.The results showed that the average importance score is 2.76,the average satisfaction score is 3.03.Most of the elements are satisfied by tourists.Among the 24 elements,11 elements are highly satisfied,and the remaining 13 elements are in low satisfaction.The IPA analysis map of the scenic spot is divided into four quadrants,the superior zone,the improvement zone,the opportunity zone and the maintenance zone.Suggestions were put forward for improving the quality of scenic spots.

Technical Application

Progress in the Application of Dendrometer

ZHANG Yueying, ZHOU Zhiyong

2019, 0(1):  129-135.  doi:10.13466/j.cnki.lyzygl.2019.01.020

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Dendroclimatology is an important means of studying global climate change.Long-term monitoring of radial growth of trees is the basis for revealing the mechanism of tree radial growth response to climate change.The Tree Radial Growth Gauge is a long-term,continuous,and high-resolution method for monitoring the radial growth of trees.Based on the research and application of tree radial growth measuring instrument,this paper reviews the research progress at home and abroad,and puts forward the prospect of future development trend.

Research on Internet of Things Technology for Intelligent Forestry

FENG Ge

2019, 0(1):  136-140.  doi:10.13466/j.cnki.lyzygl.2019.01.021

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Internet+ has been developed in accordance with the rapid growth of Internet technology.Faced with the particularities and complexities of traditional forestry,the related application research of forestry based on Internet of Things(IoT)technology was proposed.The research status of intelligent forestry development was analyzed,the application of IoT technology in forestry was introduced,and the challenges and countermeasures of IoT technology in forestry development were studied.

Research Bulletin

Study on Ecological Monitoring Technology of Baotou Yellow River National Wetland Park

YANG Liwen, CHANG Fei

2019, 0(1):  141-145.  doi:10.13466/j.cnki.lyzygl.2019.01.022

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This paper introduces the ecological overview and ecological monitoring contents of the Baotou Yellow River National Wetland Park,and establishes the ecological monitoring index system.By using the methods for the current situation survey,biological monitoring and environmental monitoring,the ecological conditions of the Baotou Yellow River National Wetland Park were investigated in detail.The research content can provide a reference for ecological monitoring in wetland parks.

Study on Vegetation and Plant Diversity in West Helan Mountains

DUAN He, ZHANG Yuxing, ZHANG Jianbo

2019, 0(1):  146-152.  doi:10.13466/j.cnki.lyzygl.2019.01.023

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The complex environment and climate of west Helan Mountains in Inner Mongolia cultivate a variety of plant species and vegetation types.Based on a large number of field investigations,this paper studied the flora,vegetation classification system and types of west Helan Mountains in Inner Mongolia,as well as the general situation of main vegetation types.The results revealed that there were 357 genera and 788 species of wild vascular plants in the study area.Vegetation types in the study area include forest,shrub,grassland,open forest,desert,meadow and aquatic and marsh vegetation.Finally,the spatial pattern of vegetation in the study area was studied from vertical differentiation,horizontal differentiation and slope differentiation respectively.

Study on Adaptability and Planting Configuration of Main Tree Species in Beijing Plain Afforestation Project

YU Lingxiao

2019, 0(1):  153-157.  doi:10.13466/j.cnki.lyzygl.2019.01.024

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In the plain afforestation project area of Daxing District of Beijing,the three site types are selected from the sandy land along the Yongding River,some landaresa inside the sixth-ring road and the east-central loamy land.The study of tree species conservation and allocation is based on the forest conservation rate,tree height and crown width.Preliminary conclusions are drawn:1)In the sandy land along the Yongding River,the ecological adaptation of eleven species including Robinia pseudoacacia,Ailanthus altissima,Robinia pseudoacacia cv.idaho,Populus albavar.pyramidalis,Ulmus pumila cv.jinye,Sophora japonica cv.Golden Stem,Platanus acerifolia,Populus tomentosa,Koelreuteria paniculata,Salix matsudana and 107 Populas L.is good,followed by Ginkgo biloba and Catalpa bungei and Acer mono is worst.2)In the sixth-ring demolition,the seven tree species including Sophora japonica,Koelreuteria paniculata,Robinia pseudoacacia,Fraxinus chinensis,Ginkgo biloba L,Ulmus pumila cv.jinye and Catalpa bungei have good ecological adaptability,followed by Magnolia denudata and Paulownia,and the ecological adaptability of Metasequoia glyptostroboides,Platanus acerifolia and Eucommia ulmoides Oliver is worst.3)In the east-central loamy land,eight species of Robinia pseudoacacia,Sophora japonica,Populus tomentosa,Ginkgo biloba,Populus davidiana,Populus tomentosa,Ulmus pumila.,and Ulmus pumila cv.jinye.have better ecological adaptability,followed by Fraxinus chinensis and Koelreuteria paniculata.Platanus acerifolia and Ailanthus altissima have the worst ecological adaptability.The three site types are all arranged according to the principle that the heights of adjacent tree species are similar.