Table of Content

28 February 2017, Issue 1

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Integrated Management and Administration

Discussion on Improvement of Sampling Design of National Forest Resources Macro-Monitoring

HUANG Guosheng, ZENG Weisheng, DANG Yongfeng, ZHI Changgui

2017,(1):  7-11.  doi:10.13466/j.cnki.lyzygl.2017.01.003

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Aim ed at sampling frame design of 20km×20km and cluster sampling design with 25 plots in national forest resources macro-monitoring,and based on results of the 1 ^st macro-monitoring in 2015,an improvement scheme was presented,which could meet the needs of sampling precision of all provinces,intensify the grid of sampling frame,and decrease the number of plots to nine in a cluster.This would provide a basis for optimizing the national forest resources macro-monitoring plan developed in 2016.

Review and Analysis on Jatropha Industry

DONG Min, HE Jun, XU Yanhong, LUO Mingcan

2017,(1):  12-18.  doi:10.13466/j.cnki.lyzygl.2017.01.004

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This paper reviews and analyzes the development of Jatropha industry in China,including resource distribution,scale and yield,development model,and summarizes exploitation situation of Jatropha biodiesel from the aspects of production technique,market,raw material supply and policy support.Finally,relevant suggestions are proposed.

Review on Assessment of Forest Park Ecosystem Service Functions

LIN Lili, DONG Jianwen, LIU Xingzhao, HUANG Liujing, LIN Ri, WANG Qi, ZHANG Zengke

2017,(1):  19-26.  doi:10.13466/j.cnki.lyzygl.2017.01.005

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Based on the analysis of forest park development status and forest park ecosystem service function research progress,this paper summarizes the main evaluation indexes for forest park ecosystem service function value assessment such as water conservation,carbon fixation and oxygen release,air purification and biodiversity.Secondly,it discusses the measurement method of water conservation,carbon fixation and oxygen release and biodiversity conservation,and analyzes measurement principle,advantages and disadvantages.Finally,according to the current situation of different evaluation indexes,it proposes that Chinese forest park ecological evaluation system be established based on distributive calculation method.It is suggested that study should conducted on the development of future forest park combining with ecosystem assessment precision and the mechanism for dealing with climate change.

Analysis of Impact Factors on Forest Park Passenger Flow Based on Baidu Index

WU Xiao, CHEN Shaozhi, ZHAO Rong

2017,(1):  27-30.  doi:10.13466/j.cnki.lyzygl.2017.01.006

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With the rapid development of domestic tourism,forest park has become the choice of more tourists because of its good resources.Using the Baidu index platform to obtain various search index,this paper studied the correlation of search index and forest park passenger flow,as well as the factors affecting forest park passenger flow.The results showed that there was a coupling between forest park and the search index.Multiple linear regression analysis method was used to estimate the main factors affecting the forest park passenger flow in various regions,including search index.The results showed that the main factors of forest park passenger flow were GDP and forest park resource abundance,thus it can be seen that the better economic and resource conditions of the region were associated with the greater forest park passenger flow.Through the analysis of Baidu Index and Forest Park traffic scatter plot,it was obvious that the correlation between the output and the input area of the tourists is obviously different.The results of this study will be helpful to guide the development plan of forest park and the operation decision of forest park management department.

Scientific Research

Study on Growth and Yield Forecast Model for Eucalyptus Pulpwood Plantation

LI Zongjun, MO yanqing, MO Xiaoyong, ZHAO Xueli, LIU Ping

2017,(1):  31-36.  doi:10.13466/j.cnki.lyzygl.2017.01.007

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The eucalyptus pulpwood plantation of State-run Leizhou Forestry Bureau was taken as the research object and the eucalyptus pulpwood plantation growth and yield model was studied based on the data of 190 sample plots surveyed in January to February in 2015. SPSS 19.0 and ForStat 2.2 were used.Results show that density index model is SDI=1.7470N0 ^1.0951 {\mathrm{e}}^{-3.7637t^{0.05-0.1742L}} ,basal area growth model is G=16.7828L ^0.1529 (1- {\mathrm{e}}^{-1.0125\times {10}^{-8}\mathrm{}\mathit{SD}{I}^{-2.1970}t} ) ^0.5554,volume model is M= {\mathrm{e}}^{2.3641+0.0988L-3.0557t^{-1}\mathrm{}{G}^{0.9126}} .The research results can provide theoretical basis for forecast of growth and yield,determination of forest mature age and forest resources management for eucalyptus pulpwood plantation in State-run Leizhou Forestry Bureau.

The Empirical Research on Coordinative Processing of Forest Land Data in One Map of Forestry and Land

TAO Jixing, XU Da, DAI Yunzhuo, ZHANG Guojiang, JI Biyong, ZHANG Xiaowei

2017,(1):  37-42.  doi:10.13466/j.cnki.lyzygl.2017.01.008

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Based on spatial overlay analysis to one map of forestry and land with the aid of GIS,forest management types in each plaque are effectively connected in one map of the two departments.With the concept of forest basic management attributes of the forestry department,butt-jointing of the range of forest land identified by the land department is taken into full account and forest management types are divided into forest land jointly determined by the both sides,forest land unilaterally determined by the forestry department,forest land on agricultural and unused land,forest land on construction land.The results showed that there is a smaller difference of forest land range jointly determined by the both sides in the mountainous county,the hilly county comes second,the plain and basin county has the biggest difference.The mountainous county has the smaller proportion in area and the plain county has the greater proportion in area in forest land unilaterally determined by the forestry department.There is the more forest land on agricultural and unused land in the plain county and the less forest land on agricultural and unused land in the hilly and mountainous counties.The truth is that the proportion of forest land area on construction land is highly relevant to greening level of local urban area.Generally,there is more forest land on construction land in plains and less forest land on construction land in mountainous area.

Analysis on Tending Effect of Chinese Fir Plantation at Different Ages —A Case Study of Jing'an County,Jiangxi Province

ZHONG Cheng, WANG Ruihui, FU Weinan, ZHOU Yangchao, ZHOU Yigang, PENG Cong, ZHU Xiuhua

2017,(1):  43-49.  doi:10.13466/j.cnki.lyzygl.2017.01.009

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In this study,two types of thinning and control(non-tending)treatments were set up in 5 year-old(young),12 year-old(middle-aged),18 year-old(near-mature)Chinese Fir plantations respectively on tending before(2013)and after thinning(2015).The results showed that tending thinning promoted the growth of DBH and individual volume,and the average DBH increment was 44.4%,25.0% and 14.3% higher than that of CK,with tending the average individual volume increment was 59.3%,31.0% and 19.9% higher than that of the control,the difference was significant(P< 0.05);As for thinning on tree height growth,the promoting effect,compared with the difference,was not significant(P>0.05);tending significantly improved the Chinese Fir young and middle aged forest health status and health level of tending plot generally higher than the control one;tending improved the forest species abundance,vegetation height and coverage and the vertical structure of vegetation plots significantly;Overall,the effects of thinning on the growth of young Chinese Fir forest,plant growth and forest health were better than those of the middle aged forest and near mature forest.The results provided reference basis for the scientific tending of Chinese Fir plantation.

Research on Undergrowth Plant Diversity in Larix Principis-rupprechtii Plantation with Different Thinning Levels —Taking Longxing Forest Farm of Guandishan in Shanxi Province as an Example

LIU Hongyan, CHENG Dongli, LIU Jie, ZHAO Yu, ZHANG Yunxiang, GUO Jinping

2017,(1):  50-56.  doi:10.13466/j.cnki.lyzygl.2017.01.010

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Thinning is one of the important technical measures of forest management and also an important way to improve and maintain forest diversity and sustainability.Therefore,thinning and fixed-point observation which can clarify the impacts the thinning operations have on undergrowth diversity,the difference which different thinning intensities make in undergrowth diversity and the effects the different thinning intensities have on the duration and dynamic change of plant diversity,which can also reveal the impacts the management activities have on the formation of forest diversity and the role in maintaining mechanism and have important theoretical and practical significance.In this paper,through a series of different thinning intensity tests and a 6a fixed observation in Larix principis-rupprechtii plantation in Longxing Forest Farm,using plant species composition,species diversity index and community similarity index of Sorensen to analyze and reveal the difference which different thinning intensities made on the Larix principis-rupprechtii plantation undergrowth species composition and its influence on the plant species diversity and its dynamic change.Results suggest that thinning can significantly increase the undergrowth plant diversity.The plant species increased as the thinning was enhanced.In addition,thinning can also increase species diversity of undergrowth plants significantly.There are significant differences between the thinned and the unthinned.The difference of species diversity under different thinning intensities is also obvious.Medium and heavy thinning had more significant influence.After thinning for 6a,plant species of undergrowth plants and diversity index continued to increase and the thinning effect was still significant.Compared to the control stands,the mutual plant and similarity coefficient of undergrowth plants were significantly lower.The mutual plant and similarity coefficient would be lower if there was greater difference in thinning intensity.

Study on the Volume Table of Scotch Pine in Saihanba Aera

XU Qing, LI Xiaosha, XU Zhongqi, ZHANG Yan, ZHANG Fei, CHENG Shun, CUI Tongxiang

2017,(1):  57-62.  doi:10.13466/j.cnki.lyzygl.2017.01.011

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Based on the data measured in the Saihanba area,standard volume model,one-way tree volume model of DBH and one-way tree volume model of ground diameter were established,which were V=0.00006938D ^{1 . 763} H ^{1 . 037} (R ²=0.997),V=0.000123D ^{2 . 494} (R ²=0.970) and V=0.00001235D ^{3 . 017} (R ²=0.950),respectively.Based on the above models,the standard volume table,one-way tree volume table of DBH and one-way tree volume table of ground diameter are constructed.The t-test showed that the above volume tables had good applicability in the area.And there was a significant difference between the standard volume model in the Saihanba area and tree volume model of Scotch pine in Daxinganling and Liaoning areas.So different volume tables should be established for the same tree species distributed in different areas.

Research on Boundary Definition and Plant Community Diversity of wetland-grassland Ecotone —A case study:Siertan Wetland in Ningxia

SU Xiangling, WANG Zhenxi

2017,(1):  63-69.  doi:10.13466/j.cnki.lyzygl.2017.01.012

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In order to study boundary definition and plant diversity of wetland-grassland ecotone in Yanchi country,Ningxia,vegetation investigation was carried out in July,2014.The moving split-window technique was applied to the quantitative determination of ecotone and diversity indexes(species diversity index,community dominant concentration index,community evenness index,species richness index)were used to analyze plant community diversity.The results showed:(1)When window width was 6 quadrats,it can clearly delineate the ecotone boundary;The ecotone boundary of east,west,south,north line transect is 120m,120m,120m,140m respectively and distance from core area of wetland is 180m,220m,240m,200m respectively;(2) species diversity index,community evenness index,species richness index of the four transect lines all followed the order of ectone>arid region>wet region,while community dominant concentration index was in such an order as arid region>ectone>wet region;(3)The species diversity index,community dominant concentration index,community evenness index of north line transect were higher,but four diversity indexes of west line transect were lower.The results can provide theoretical support and scientific basis for the protection of valuable wetland resources,the maintenance of biological diversity and the stability of ecological system in arid and semi-arid regions.

Biomass and Carbon Density of Forest Communities in Shanxi Huoshan Mountains

CHENG Lifen

2017,(1):  70-74.  doi:10.13466/j.cnki.lyzygl.2017.01.013

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Based on field investigation,biomass and carbon density of forest communities in Shanxi Huoshan Mountains were estimated by using the biomass expansion factor(BEF)continuous function method and its distribution pattern and influence factors were analysed.Results showed that the average unit area biomass and carbon density of forest communities in Shanxi Huoshan Mountains were 58.00 t/hm ² and 29.46 t/hm ².The average unit area biomass(62.35 t/hm ²)and carbon density(31.17 t/hm ²)of Quercus wutaishanica forest were highest in comparison with that of the Pinus tabulaeformis forest(58.44 t/hm ²,30.10 t/hm ²).Pinus bungeana forest(56.58 t/hm ²,28.79 t/hm ²),Platycladus orientalis forest(54.86 t/hm ²,27.91 t/hm ²)and Robinia pseudoacacia forest(53.78 t/hm ²,26.74 t/hm ²).The correlation coefficient between altitude and biomass was 0.65 and the correlation coefficient between altitude and carbon density was 0.68,which all showed significant positive correlation(P<0.01).The relationships between slope,slope aspect,slope position and biomass,carbon density were not significant.Altitude was the main influence factor on distribution pattern of forest biomass and carbon density in Shanxi Huoshan Mountains.

Establishment of Standardized and Time Normalized Database of Forest Resources Inventory in China

GAO Jinping, LEI Yuancai, GAO Xianlian, HAO Yuelan, YIN Huali

2017,(1):  75-81.  doi:10.13466/j.cnki.lyzygl.2017.01.014

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Standardized and time normalized data of the latest two or more forest resource inventory plots in the provinces were achieved to obtain the sample data of the forest resources plots and samples in the target year,and a nationwide database of 2005,2012 and 2014 sample plots and trees were established.It provides effective ground data support for China's forest resource dynamic analysis,forest resource monitoring,forest volume and biomass modeling.

Remote Sensing Estimation of Biomass of Pinus kesiya var.langbianensis by Geographically Weighted Regression Models

LÜ Yanyu, LI Chao, OU Guanglong, XIONG Hexian, WEI Anchao, ZHANG Bo, XU Hui

2017,(1):  82-90.  doi:10.13466/j.cnki.lyzygl.2017.01.015

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The Biomass model of Simao pine(Pinus kesiya var.langbianensis)was built based on the data collected from 120 Simao pine sampling trees,Landsat TM images in 2005 and the data of forest resource inventory in 2006 in Jinggu County,Yunnan Province.Then the remote sensing biomass estimation Model of Simao Pine were built by the ordinary least square(OLS)and geographically weighed regression(GWR).The results showed that:GWR model had a better fitting effect than OLS,in which coefficient of determination(R ²)was significantly bigger than the OLS model,Akaike information index(AIC)reduced by 7.832;It was obviously depicted from the sample test of independence that model prediction accuracy was improved from 72.70%(OLS)to 75.06%(GWR).The unit-area biomass was 49.02t / hm ² by inversion,and basically consistent with the measured data;it was lower than the measured data 1.229%,and less than the estimation value of OLS.The total biomass of Simao pine in Jinggu County was 2.101×10 ⁷ t based on GWR model.The study indicated that forest aboveground biomass estimation based on geographically weighed regression(GWR)model could improve effectively the fitting accuracy of forest biomass estimation model,and could be used to estimate the biomass of Simao pine forest by remote sensing.

The Typical Forest Community Structure and Diversity of Evergreen and Deciduous Broad-leaved Mixed Forest in Qizimeishan National Nature Reserve

GUO Qiuju, CHEN Libo, AI Xunru, YAO Lan

2017,(1):  91-97.  doi:10.13466/j.cnki.lyzygl.2017.01.016

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The permanent monitoring sample plots were established in the typical area of evergreen and deciduous broad-leaved mixed forest in Qizimeishan National Nature Reserve.The structure and ecological diversities of this ecosystem were investigated using the conventional methods of community types.The finding results showed that:1)According to the analysis of plant population size and importance values of the community,Cyclobalanopsis multinervis,Eurya alata and Carpinus fargesiana sequenced as the top three of abundance and important values in this community,so these three species were the dominant and symbolic species for this community.The typical type of evergreen and deciduous broad-leaved mixed forest in Qizimeishan National Nature Reserve is the Cyclobalanopsis multinervis +Carpinus fargesiana-Eurya alata community.(2)Age structure analysis results presented that the most of the Cyclobalanopsis multinervis,Eurya alata and Carpinus fargesiana were young trees and the most individuals were concentrated in the Ⅰ and Ⅱ diameter classes,and this results suggested the good generation growth,so this population was a typical growing population.(3)The diversity index of Shannon-wiener index,Pielou evenness index and Simpson's diversity Index indicated that the richness and evenness degree of trees’ layer were higher than that in the shrub and grass layers.(4)The most individuals of Cyclobalanopsis multinervis and Eurya alata populations occupied the ecological space below 10 meters,and Carpinus fargesiana and Liquidambar acalycina took up the middle and upper layer space.The plant species occupied different space levels,and the mature individuals would dominate the upper layer space step by step.

Evaluation of Whooper Swan Wetland Habitats in the Middle Reaches of the Yellow River and Conservation Strategies

LI Yujie

2017,(1):  98-104.  doi:10.13466/j.cnki.lyzygl.2017.01.017

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This paper discusses the habitat evaluation procedures and criterion of whooper swan in the middle reaches of the Yellow River.Taking Pinglu of Shanxi Province as an example,it analyses the main factors affecting the habitat quality of whooper swan and comprehensively evaluates the distribution and habitat quality of whooper swan in this region.And on this basis the strategies on conservation are proposed.

Plant Community and Species Diversity in the Changanshan Forest Park of Fuzhou

LIN Xiabin, PENG Donghui, HUANG Huada, CHEN Shuping, HUANG Shijia, YE Xiaolin

2017,(1):  104-109.  doi:10.13466/j.cnki.lyzygl.2017.01.018

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The space distribution,species diversity,species association degree and forest floor dynamics in Changan Forest Park of Fuzhou were studied and analyzed through field investigation and statistics.The results showed that:(1)the herb layer has the most uniform distribution,and the second one is tree layer,while the last one is shrub layer;(2)the species of shrub layer possesses the most diversity of species and community,and then is the tree and herb layer.But the correlation between species is poor.;(3)the number of species in the regeneration layer is relatively small,and the species is simplex which will not be conducive to the development of the forest.The species richness and abundance of the succession layer is beneficial to the forest.The study concluded that the correlation between Changan Forest Park is poor which is in the primary succession stage and needs to be further transformed.

Spatio-temporal Change in Precipitation and Surface Temperature and Their Relationships with NDVI of Different Ecological Function Zones in North Xinjiang

WANG Jiping, GUO Zhongjun, CHENG Fu, ZHANG Qibin, MA Huan, YU Yilei

2017,(1):  110-117.  doi:10.13466/j.cnki.lyzygl.2017.01.019

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Precipitation and surface temperature are two most important climatic factors.They are also two main factors that affect the distribution and change of the vegetation.Based on the average annual precipitation,temperature,NDVI and snow depth data of many years,the changes in different climate factors and their correlation with NDVI were analyzed.The result shows that:most of the regions in north Xinjiang tend to be wetting,especially in the central area of the Junggar Basin,where the slope of the precipitation change is between 1.15 and 1.42;the annual average precipitation in the high altitude mountain area that only makes up 2% of the whole region decreases obviously,the sharpest decreasing slope of the precipitation change is -0.203;the overall temperature of north Xinjiang shows a warming trend,of which the slope of temperature increase shows a significantly gradient pattern from high mountains(2.04)to lowland(-0.044);NDVI is closely related to average annual rainfall and temperature variations.We should attach importance to strengthening the construction and management of vegetation on the scale of ecological function area.

Temporal-spatial Dynamic Change Characteristics of Vegetation Coverage in Arid Regions of Northwest China

ZHAO Jing, ZHOU Yaozhi, DENG Xingyao

2017,(1):  118-126.  doi:10.13466/j.cnki.lyzygl.2017.01.020

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Based on the MODIS NDVI data of the normalized difference vegetation index products obtained between 2000 and 2015,Variable coefficient,Theil-Sen median trend analysis,Mann-Kendall test method and Hurst index method were utilized for research on the temporal-spatial dynamic change characteristics of vegetation coverage in the arid region of Northwest China and the future trends. The results showed:1)the vegetation coverage in the entire region has a strong spatial heterogeneity,the area of vegetation and bare fallow accounts for 35.59% and 64.41% of the total area,respectively. Affected by precipitation,higher value area of NDVI is mainly in the mountains and southeastern region which have a rich rainfall,the low value areas of NDVI are concentrated on plains and northwestern region which have a poor rainfall;Influenced by rivers and irrigation,the vegetation coverage of desert is lower than the oasis which has the better hydrothermal conditions. 2)the variation degree of the entire regional vegetation coverage in the recent 16 years was not obvious. The fluctuation in each subregion is slight,and the proportion of region where the variation degree is less than 0.10 is as high as 1/2. 3)the entire regional vegetation coverage in the recent 16 years shows fluctuation changes which have a increase trend,the change rate is 0.006/10a. The analysis based on the pixel scale also shows a increase trend,the area of increase trend in Hexi Corridor is the largest and in Northern Xinjiang is the least. 4)Hurst index average of the entire regional NDVI is 0.73. The scope of Hurst index greater than 0.5 accounts for 86.25%. The change trend of the entire regional vegetation coverage in the future is mainly in persistent increase. Among them,13.46% area change trend cannot be determined. The change trend in the future of the increase degree in each subregion is different,the increase trend in Hexi Corridor is the most obvious and in Northern Xinjiang is the least.

Study on the Response of Vegetation Cover Change and Climate Change in Wujiang River Basin Based on MODIS Data

SHI Yueyue, YIN Zhengtong, ZHENG Wenfeng

2017,(1):  127-134.  doi:10.13466/j.cnki.lyzygl.2017.01.021

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The relationship among NDVI,Temperature and precipitation changes in Augusts in Wujiang River basin between 2001 and 2015 was analyzed to get the temporal and spatial variation laws of vegetation change and provide reference for ecological protection of Wujiang River Basin.Based on the data of MOD13Q1,MODIS11 C3 and TRMM3B43,the trend analysis method was used to analyze the change trend situation of NDVI in 15 years.After that,simple correlation analysis,partial correlation analysis and multiple correlation analysis were used respectively to analyze the response of NDVI change with climate change.The results are as follows:the vegetation cover change is an overall upward trend in Wujiang River basin in 15 years.The relationship between vegetation cover change and the temperature is a negative correlation.The influence of rainfall on NDVI is greater than the temperature;The temperature and precipitation effects on cultivated land is the largest and on the evergreen coniferous forest is second.Elevation of vegetation cover change at the 1 000~2000m was the largest in the evergreen coniferous forest.The decrease of vegetation cover along the Wujiang River is related to the cascade development of Wujiang River Basin,NDVI changes in the area of the hydropower station were shown as the core outward radiation reduction.The increase of vegetation coverage in the study area was mainly concentrated in the urban suburb,which is dominated by coniferous forest and cultivated land.It is the result of human being and climate interaction.The percentage of precipitation driven vegetative coverage is 27.75% in Wujiang River basin,the climate response larger than vegetation type is given priority to cultivated land;The percentage of the non-temperature and precipitation driven vegetative coverage is 72.25% in Wujiang River basin and human activities on the wujiang river basin vegetation cover change plays a leading role.The increase of vegetation coverage in the study area is mainly concentrated in the urban suburb,which is dominated by coniferous forest and cultivated land.It is the result of human being and climate interaction.

Analysis on Karst Rocky Desertification Temporal and Spatial Variation Characteristics and Driving Factors —A Case Study of Qinglong county of Guizhou Province

SHI Yingchun, SHU Yingge

2017,(1):  135-143.  doi:10.13466/j.cnki.lyzygl.2017.01.022

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Based on remote sensing image of Qinglong County in 2000,2005,2010 and 2015 as the research data,comprehensive index method was used to obtain six grades of rocky desertification,such as no obvious rocky desertification,potential rocky desertification,slight rocky desertification,moderate rocky desertification,intense rocky desertification and extreme intense rocky desertification and the map of rocky desertification classification was extracted.Spatial-temporal dynamic model of rocky desertification was used variation characteristics of rocky desertification in time and space in the past 15 years in the study area analyzed,the principal component analysis method employed and the weight of each driving factor of rocky desertification determined.The result shows that from 2000 to 2015,in time,the extreme intense rocky desertification,intense rocky desertification and moderate rocky desertification area are sharply decreased;no obvious rocky desertification,potential rocky desertification and slight rocky desertification appeared as an increasing trend.No obvious rocky desertification,moderate rocky desertification and intense rocky desertification,rocky desertification dynamic degree change are more evident;comprehensive rocky desertification dynamic degree change is smaller,which showed a decreasing trend.In space,rocky desertification grade increasing region mainly occurred in the Huagong Town and Datian Village,and rocky desertification grade decreasing area is relatively bigger,mainly distributed in Changliu Village,Zhongying Township,Machang Village.From 2000 to 2015,continuous rocky desertification changing is the result of joint action of the natural environment and human activity,of which land type area change and population are most significant to the impact of rocky desertification change.Driving factors of rocky desertification area change mainly include population,forest coverage rate,forestland area,cultivated land area,per capita net income of farmers,grassland area and GDP.It is expected that the research results could provide some reference for rocky desertification region’s ecological management work and land sustainable use.

Analysis on Vegetation Spatio-temporal Variation of Nansi Lake Based on MODIS

YU Quanzhou, DONG Jie, LIU Enfeng, ZHOU Lei, LIANG Chunling, ZHANG Huaizhen, CAO Jianrong

2017,(1):  144-152.  doi:10.13466/j.cnki.lyzygl.2017.01.023

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Spatial and temporal change study of wetland vegetation is an important part of the global change and terrestrial ecosystem research.We selected vegetation index(NDVI and EVI)data of Moderate Resolution Imaging Spectroradiometer(MODIS)during 2000 to 2015 as indicators to represent vegetation cover.Using pixel-based linear trend analysis and stability analysis method,we studied the vegetation coverage temporal and spatial evolution and vegetation stability pattern of Nansi Lake,and combined with meteorological data and other related data to analyze its control factors.The results show that:1)Vegetation coverage of Nansi Lake was controlled by landscape pattern,with a reducing banded distribution from the lake shore to the eulimnetic area.2)Vegetation coverage change had stage characters.Vegetation coverage was at a high level in growing season from 2000 to 2003,at a low level from 2004 to 2006 and fluctuated after 2006.Vegetation coverage had bimodal trends within the year,especially in the lower lake.3)Vegetation coverage decreased significantly at the lake-land ecotone in Nansi wetland.Vegetation index decreased by 0.1 to 0.3 per 10 years averagely,and it increased slightly at other regions.4)Stability of vegetation coverage presented the annular characterized,increasing from the central to shores of the lake gradually.5)Vegetation coverage has the close relationship with regional precipitation and lake level change caused by precipitation.Except the extreme precipitation year(2003),annual precipitation and wetland vegetation index showed a significant negative correlation(P<0.05),and correlation coefficients were -0.60(for NDVI)and -0.66(for EVI).As an important hydro-junction at south-to-north water transfer east route project,frequent hydrological regulation in Nansi Lake inevitably influences wetland vegetation coverage pattern,even affecting the Nansi Lake ecological processes and functions,to which relevant managers should pay serious attention.

New Development Other Countries

Forestry Development in Central and Eastern European Countries and Analysis on Future 16+1 Forestry Cooperation

WANG Yanqin, CHEN Jie, GU Yali

2017,(1):  153-159.  doi:10.13466/j.cnki.lyzygl.2017.01.024

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As the Belt and Road Initiative and 16+1 Cooperation mechanism have been established and implemented,the central and eastern European countries,which are located along the Belt and Road,are the key area for the forestry cooperation with China.These countries boast rich forest resources,strong sci-tech strength and good foundation for industrial development,which was laid a solid foundation for the forestry cooperation with China.The paper analyzed the forest resources,forestry laws and regulation & policies,forestry governance regime,forest product production and trade,concluded that the central and eastern European countries are rich in forest resources,have improved forest governance mechanism in place,and own the good foundation for forest product industry.Based on this,the authors explored the potentials for China and the central and eastern European countries to carry out forestry cooperation as well as the possible risks to be encountered.This study is expected to provide references and supports for the future 16+1 forestry cooperation.