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    Assessment of Ecological Product Value and Financial Subsidy Scheme for Natural Hardwood Forests
    YU Songbai, SU Chenhui, ZHANG Hongai, LIU Daoping, LU Kangying, CHEN Shaolong
    Forest and Grassland Resources Research    2023, 0 (5): 29-39.   DOI: 10.13466/j.cnki.lczyyj.2023.05.004
    Abstract317)   HTML10)    PDF (1144KB)(124)       Save

    According to the operational data of natural hardwood forests in Guangdong Province,using the theories of forest resource asset evaluation and research findings on the value of natural forests,this study evaluated the existing and potential natural forests at different age points.The assessment measured the various ecological product values that can be realized through resource assetization and value monetization.Against the backdrop of the current Natural Forest Protection Project,government financial subsidies were proposed as the optimal approach to realizing the ecological product value of natural forests.This subsidy scheme encompassed several aspects,including compensation for increased economic conversion value of mountain forest prices with improved ecological efficiency,compensation or funding for operational losses resulting from selective cutting or cessation of logging,and subsidies for economic losses incurred due to mature,renewable timber that cannot be harvested due to restrictions.Based on the principle of opportunity cost,scientifically fair and equitable fiscal subsidy standards for selective logging or cessation of logging were proposed.A comparison with the current implementation standards revealed a significant inadequacy in the current standards,highlighting significant room for improvement.The proposed methodology of this study was scientific and provided technical references for formulating and revising policies on fiscal compensation for ecological benefits.It also offered theoretical support for the transfer and redemption of collective and individual natural forests in the construction of nature reserves.Additionally,this research provided practical guidance for the valuation of public ecological assets in nature reserves.

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    The Resource Status and Conservation Strategies of National Key Protected Wild Plants in China
    JIANG Yafang, TIAN Jing, LIU Zengli, MA Wei, SHAO Wei, BAI Ling
    FOREST RESOURCES WANAGEMENT    2023, 0 (4): 1-10.   DOI: 10.13466/j.cnki.lyzygl.2023.04.001
    Abstract283)   HTML36)    PDF (1248KB)(223)       Save

    Accurate data on the population and survival status of wild plant are the basis for the plant diversity conservation.The Regulations of the People's Republic of China on the Protection of Wild Plants make it clear that the wild plants administrative departments should periodically organize surveys of national key protected wild plants,and establish wild plants resource archives.Therefore,China launched the second national survey of national key protected wild plants in 2012.Based on the survey data,the population,community area and in situ conservation status of 283 species of national key protected wild plants in China are reported.Reasons for the changes of wild plant resources over the past 10 years are also discussed through comparative analysis between the first and second national survey of national key protected wild plants.In order to advance conservation and management of wild plants in China,several countermeasures and suggestions were put forward,including establishing a national platform for wild plant supervision and management,improving the plant diversity conservation system,and carrying out the wild plant rescue and conservation projects.

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    Discussion on the Technical System of Forest Fire Risk Assessment
    JIANG Chunying, YANG Xueqing, ZHANG Guoli, SUN Zhichao, JIANG Yun'an, JIANG Aijun
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 17-26.   DOI: 10.13466/j.cnki.lyzygl.2023.02.003
    Abstract266)   HTML18)    PDF (1228KB)(367)       Save

    The risk assessment index system of forest fire was constructed by comprehensively utilizing the hazard of forest fire,the exposure and vulnerability of disaster bodies.The hazard of disaster was based on the contents of combustibles,meteorological conditions,field fire sources,terrain and topography,the exposure of disaster bodies was based on the contents of above-ground living biomass,number of buildings,population,GDP,and the vulnerability of disaster bodies was based on the proportion of flammable forest land,proportion of combustible building area,proportion of the elderly and young population,vulnerability of economic activities.Using The Analytic Hierarchy Process and expert scoring,this paper determined the weights of each evaluation indicator.It refined the accuracy of forest fire risk assessment to multiple spatial scales such as small class,30 arc second geographic grid,township level,county level,etc.to meet the accuracy requirements of forest fire prevention management at different administrative levels of the country,province,city,and county.At the same time,this paper proposed the best solution for forest fire risk identification in different regions and periods.

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    Analysis of General Status and Examination of Estimation Errors for One-Variable Tree Volume Tables in China
    ZENG Weisheng, YANG Xueyun
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 43-49.   DOI: 10.13466/j.cnki.lyzygl.2023.02.006
    Abstract261)   HTML7)    PDF (1271KB)(620)       Save

    Tree volume tables are important basic tools in forest inventory and monitoring.One-variable tree volume tables have been used in continuous forest inventories (CFIs) of China for more than 40 years,but we have never systematically tested the applicability in nowadays.In this paper,the general status of currently used one-variable tree volume tables were analyzed from the aspects of quantity,zoning,tree species,and model type;and most of one-variable tree volume tables were examined by using the tree height data of 138 911 sample trees.The results showed that the total number of one-variable tree volume tables used in China's CFI reached 707,and the number of provincial volume tables varied greatly,from 3 to 171;there were 18 provincial regions divided into several modeling populations,while others were based on whole provincial regions;there were also great differences in the number of tree species groups for developing tree volume tables in each provincial region,with the least being 3 and the most being 31;a total of 25 models were used to develop tree volume tables,but nearly 90% of the tree volume tables were based on 5 models;about 70% of the one-variable tree volume tables exceeded the allowable error limit of ±5%,and 10 of 31 provincial regions and four forest industry groups exceeded the range of ±10% of the volume estimation errors,among which the maximum negative bias was -14.86% and the maximum positive bias was 23.22%.Based on the results of analysis,it is suggested that at the end of this inventory,a comprehensive and systematic applicability test should be carried out on the current one-variable tree volume tables;and unified revision should be made on the tree volume tables with significant deviation,so as to optimize and adjust the division of modeling populations,tree species grouping and the volume model type;and the change of volume estimation method from one-variable table to two-variable table should be actively promoted.

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    Study on Tracing Pilot Work of China's National Park System
    MA Wei, LIU Zengli, WANG Zhichen, JIANG Yafang, TANG Xiaoping
    FOREST RESOURCES WANAGEMENT    2023, 0 (3): 1-8.   DOI: 10.13466/j.cnki.lyzygl.2023.03.001
    Abstract250)   HTML39)    PDF (3035KB)(222)       Save

    Since 2013,remarkable achievements had been made in the development of national parks in China.From the initial developement of national park system to the official establishment of the first batch of national parks and the release of the national park spatial layout plan,the leap from theory to practice had been realized.Our study focused on tracking the national park system pilots in China,sorting out and refining the pilot work at both the national level and pilot area level.By tracing the progresses of the pilot work of China's national park system,sorting out and refining the pilot work at both national and pilot area levels,comprehensively analysing and summarising the main achievements and lessons learnt at different stages of China's national park system pilot,recommendations that can be replicated and applied were put forward.In addition,we took Three-River-Source National Park as an example to trace the pilot study process to provide references for the establishment and management of national parks in China.

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    Research on Carbon Peak and Carbon Sink Capacity of Major Carbon Emitting Countries in the World
    ZHANG Zhe, ZHANG Yuxing
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 1-9.   DOI: 10.13466/j.cnki.lyzygl.2023.02.001
    Abstract248)   HTML25)    PDF (4802KB)(410)       Save

    At the level of realistic economy and technology,we must first achieve carbon peaking in order to achieve carbon neutrality.Studying the carbon peak foundation and carbon sink capacity of the major carbon emitting countries in the world has important reference significance for China to achieve carbon peak and carbon neutrality.This study sorted out the top 24 countries in economic aggregate among the world's 224 countries and regions.Based on the data of CO2 emissions,total GDP,energy consumption and reserves on forest carbon sink from 1960 to 2018,it found out total GDP and GDP per capita were positively correlated with CO2 emissions before carbon peak.When GDP per capita reached $\$$20000 to $\$$35000,and low-carbon energy accounted for more than 35%,it would be possible to achieve carbon peak and reduce carbon emissions.In addition,when GDP per capita reached $\$$35000 to $\$$45000,and high-carbon energy (coal and oil) accounted for no more than 55%,it would also be possible to achieve carbon peak and reduce carbon emissions.Energy supply structure was the first determinant of carbon peak time.The results showed that if the proportion of low-carbon energy was higher,it was easier to achieve carbon peak.Nowadays,the forest carbon sink capacity of 24 countries was constantly improving.However,the reserves on forest carbon sink were less than 15% of the country's annual carbon emissions in most countries.It still takes a long time to achieve carbon neutrality.Therefore,special attention should be paid to the healthy,stable,efficient and sustainable management of forest ecosystems.

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    Study on Forest Ecological Benefit Compensation Mechanism in Hebei Province Based on Carbon Sink Trading under Carbon Peak and Carbon Neutrality Targets
    ZHAO Zhongbao, GENG Shigang, LI Keguo, LIU Zengqiang
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 10-16.   DOI: 10.13466/j.cnki.lyzygl.2023.02.002
    Abstract239)   HTML12)    PDF (1004KB)(123)       Save

    Forest carbon sink plays an important role in carbon neutralization.Establishment of compensation mechanism for ecological benefits based on carbon sinks is an important guarantee to promote the realization of transformation goals from lucid waters and lush mountains to invaluable assets as soon as possible.At present,China's forest carbon sink ecological benefit compensation mechanism is in the exploration stage.It is urgent to integrate the forest carbon sink into the forest ecological benefit compensation system and establish an effective and stable compensation mechanism.This study discussed the feasibility of taking forest carbon sink as the basis for ecological benefit compensation from the domestic and foreign forest carbon sink ecological benefit compensation policies and implementation status,analyzed the current situation and inadequacy of the forest carbon sink ecological benefit compensation system in Hebei Province,and put forward measures for the forest ecological benefit compensation mechanism based on carbon sequestration trading.It is expected to provide references for Hebei Province to establish a market-oriented and diversified eco-compensation system,and provide suggestions for achieving carbon peak and carbon neutrality targets.

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    Practice and Discussion on the Construction of "One Map" Intelligent Management Platform for Grassland Resources Management —Take the Intelligent Grassland Management Platform of Xinjiang Production and Construction Corps as an Example
    WANG Lin, GAO Jinping, TIAN Haijing, WU Qiang, SHI Junhua, ZHOU Xin, FAN Yunbao, XIE Jingjie
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 27-35.   DOI: 10.13466/j.cnki.lyzygl.2023.02.004
    Abstract212)   HTML15)    PDF (10734KB)(137)       Save

    It is the basic requirement of high-quality grassland management in China to realize the fine management based on the grassland subcompartments (map spot).Taking the opportunity of basic grassland condition monitoring (background survey) launched throughout the state authorities of grassland administrative at the provincial level in 2021,and taking the construction of intelligent grassland management platform of Xinjiang Production and Construction Corps as an example,this paper proposed a provincial grassland information management solution under the grassland survey and monitoring system in the new era of China.The new concept of "one map" of grassland resources management put forward was first put into practice in the Corps,providing strong support for the normalization,dynamic and intelligent monitoring and management of grassland resources.The platform has good universality and can provide references and practical experiences for provinces that are conducting grassland condition monitoring.

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    Main Results of the Fourth Rocky Desertification Survey in Karst Area and Analysis of Rocky Desertification Control Situation
    NING Xiaobin, WU Xiebao, HUANG Junwei, WU Houjian, LIU Wei, PENG Xi
    FOREST RESOURCES WANAGEMENT    2023, 0 (3): 9-14.   DOI: 10.13466/j.cnki.lyzygl.2023.03.002
    Abstract193)   HTML12)    PDF (972KB)(330)       Save

    The fourth rocky desertification survey in Karst area was based on the result of the third national land survey,while taking 2021 as the base year to comprehensively investigate the condition and change of the rocky desertification land China.This paper briefly introduced the basic situation of the fourth rocky desertification survey,the present situation and dynamic change of rocky desertification land,as well as analyzed the current situation of rocky desertification control,and put forward countermeasures and suggestions.The results showed that,the rocky desertification land area was 7.223 million hm2 by 2021.Compared with 2016,the net decrease of rocky desertification land area was 3.331 million hm2,while the average annual decrease was 0.666 million hm2.The main results indicating that the rocky desertification land in China presents the overall evolution direction of "area decreasing,degree reduction and ecological condition being stable ".

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    Species Composition and Community Characteristics of Close-to-Nature Managed Pinus koraiensis Plantation Forests in the Mountainous Area of Liaodong Peninsula
    LI Lianqiang
    FOREST RESOURCES WANAGEMENT    2023, 0 (4): 90-97.   DOI: 10.13466/j.cnki.lyzygl.2023.04.011
    Abstract185)   HTML13)          Save

    To studythe species composition,zonal composition and biodiversity of Pinus koraiensis plantation communities under short- and medium-to long-term near-natural management.It provides a reference for restoration and biodiversity conservation of Pinus koraiensis plantation forests in Liaodong Peninsula.Near-natural management of 12 and 45-year-old Pinus koraiensis plantations was used as the study object.The community characteristics and species diversity were analyzed using the community sample survey method.The results showed:1)In the 12-year-old community,there were 29 species of higher plants belonging to 19 families and 23 genera.In the 45-year-old community,there were 142 species of higher plants belonging to 54 families and 96 genera.2)With the growth and development of Pinus koraiensis,the distribution types of the community species increased,the number of species increased,and the distribution range expanded.Among the species distribution types,North Temperate>Cosmopolitan>E.Asia & N.Amer,disjuncted;the temperate component was the most abundant,followed by the cosmopolitan component,and the tropical componentwas the least abundant.3)From 12- to 45-year-old,the Pinus koraiensis community remained in a pure forest state,but the species communityof thediversity increased significantly,and the trend of positive succession was obvious.The close-to-nature management cycle of Pinus koraiensis plantation was very long,and the positive succession was obvious;The biodiversity of the community under short-term management was relatively low,and it was not significantly enhanced until the middle management period.The theory of ecological niche and density dependence can well explain the ecological succession of Pinus koraiensis plantation,which has a good guiding role in the restoration of Pinus koraiensis plantation in Liaodong Peninsula.

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    FOREST RESOURCES WANAGEMENT    2023, 0 (4): 0-0.  
    Abstract185)            Save
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    Biomass Distribution Characteristics and Carbon Measurement Parameters of Chinese Fir Plantation
    LAN Xiao, HAO Haikun, HUANG Kaiyong, CHEN Qin, DAI Jun, CHENG Lin, CHEN Shichang
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 50-56.   DOI: 10.13466/j.cnki.lyzygl.2023.02.007
    Abstract182)   HTML13)    PDF (1668KB)(217)       Save

    The purpose of this study is to explore the biomass distribution regularity of Chinese fir plantation and establish its biomass prediction model,and to provide a basis for scientific prediction and reasonable evaluation of its carbon sequestration capacity.In the study,the Chinese fir plantations of different ages and different site conditions in the typical cultivation area in Guangxi were selected as the research objects,the characteristics of rhizome ratio,wood basic density,carbon content,biomass conversion and expansion factor were analyzed by means of field biomass survey and indoor measurement.The results showed that the stem biomass of Chinese fir at different ages was the highest (40.00%~67.40%),followed by the root (14.70%~22.70%).The average rhizome ratio was 0.263,and the average wood basic density was 300.5 kg/m3.There was no significant difference in the fitting effect of different relative growth equations on stem,bark,branch,above-ground biomass,underground biomass and total biomass.The average carbon content ofall organs was 50.57%,which increased with the increase of forest age.The relationship between stem biomass and stand volume was the best with power function,and the relationship between above-ground biomass,underground biomass,total biomass and volume was best with hyperbolic model.

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    Development of Tree Height-DBH Model for Cunninghamia lanceolata and Eucalyptus Robusta Based on Stand Dominant Height and Climatic Factors
    DU Zhi, CHEN Zhenxiong, Li Rui, LUO Chongbin, YANG Guojin, ZENG Weisheng
    FOREST RESOURCES WANAGEMENT    2023, 0 (4): 36-42.   DOI: 10.13466/j.cnki.lyzygl.2023.04.005
    Abstract173)   HTML18)          Save

    Based on the mensuration data of diameter at breast height(DBH)and tree height from 25 Plots of Cunninghamia lanceolata and 25 plots of Eucalyptus robusta in the annual monitoring and evaluation of national forest resources of Guangxi Zhuang Autonomous Region,the basic model with the highest simulation accuracy was selected from seven common tree height-DBH curve models,then stand dominant height and climate data were introduced to build generalized nonlinear models.The 10-fold cross-validation method was applied to test the models,and the estimation error of one-dimensional volume formula was evaluated.The results showed that:1)Among the traditional tree height-DBH curve models,Chapman-Richards model was the basic model with the highest accuracy;2)Compared with the basic model,the generalized nonlinear tree height-DBH model with stand dominant height and climate data had higher fitting accuracy.The determination coefficient(R2),mean prediction errors(MPE)and mean percent standard errors(MPSE)of Cunninghamia lanceolata model were 0.7976,0.58% and 13.91%,respectively,and those of Eucalyptus robusta model were 0.7207,0.62% and 11.58%,respectively;3)The volume calculated by the one-dimensional volume formula was quite different from the measured volume,especially the Eucalyptus robusta reach -13.51%,which exceeded the scope of forestry industry standards.It was worth noting that the relative error calculated by the binary volume formula and the generalized nonlinear tree height-DBH model is not above 0.5%.The generalized nonlinear tree height-DBH model of Cunninghamia lanceolata and Eucalyptus robusta can be well applied to practical production.

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    Species Diversity and Its Associated Factors of Castanopsis orthacantha Community in Central Yunnan
    PENG Zexi, LUO Hang, LI Xiaoying, XU Yanhong, YIN Wuyuan, ZHU Hongqin, CHEN Yuqiang, CHEN Xiaoqin
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 138-146.   DOI: 10.13466/j.cnki.lyzygl.2023.02.019
    Abstract170)   HTML9)    PDF (1023KB)(260)       Save

    In order to accurately grasp the species diversity level of Castanopsis orthacantha community and its relationship with related factors in central Yunnan,based on the investigation of typical plots,the Margalef richness index,Pielou evenness index,Shannon-Weiner diversity index and species diversity comprehensive index were used to measure the species diversity level of Castanopsis orthacantha community,and the grey correlation analysis method was used to explore the relationship between species diversity level and site factors,stand factors and forest disturbance intensity.The results showed that:1) The species composition of Castanopsis orthacantha community was rich,involving 75 families,141 genera and 202 species,and the species composition of shrub layer was the most complex.The tree species composition of the arbor layer had the characteristics of typical subtropical evergreen broad-leaved forest.And there were significant differences in species composition and important values in different regions.2) The richness index,diversity index and evenness index of shrub layer (including regeneration layer) were the highest,and the species diversity of Castanopsis orthacantha community was at a medium level.The species diversity of different survey areas in the study area was different.The contribution rate of herb layer and shrub layer (including regeneration layer) to the comprehensive index of community species diversity was the highest.3) There was a strong correlation between species diversity and six factors in three levels of site factors,stand factors and forest disturbance intensity.The order of correlation degree was altitude>forest disturbance intensity>average DBH>aspect>plant density>slope.Through research,the aim is to provide a basis for the restoration and conservation measures of Castanopsis orthacantha community in central Yunnan.

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    Investigation and Study on the Celtis in Hebei Province of China
    LI Xuesai, GAO Yunchang, ZHANG Shuzi, DU Juan
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 132-137.   DOI: 10.13466/j.cnki.lyzygl.2023.02.018
    Abstract169)   HTML7)    PDF (21992KB)(56)       Save

    Celtis L.are important landscape tree species,with important industrial and medicinal values.On the basis of access to relevant literature,field investigation and specimen verification of Celtis L.were carried out to clarify the species of Celtis L.in Hebei Province.The result showed that C.bungeana Bl.and C.koraiensis Nakai were important native tree species.C.cerasifera Schneid,C.sinensis Pers.and C.julianae Schneid were found in Hebei,with C.cerasifera Schneid as wild species recorded newly and C.sinensis Pers.and C.julianae Schneid as cultivated species over the years.The species of Celtis in Hebei increased from two species to five(including cultivated species).It was confirmed through analysis that C.cerasifera Schneid was distributed in Taihang Mountain and Yanshan Mountain of Hebei Province.

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    Discussion on Optimization of Natural Resource Asset Management System in National Park
    LING Wei, WANG Yaxuan
    FOREST RESOURCES WANAGEMENT    2023, 0 (4): 11-17.   DOI: 10.13466/j.cnki.lyzygl.2023.04.002
    Abstract164)   HTML24)    PDF (1019KB)(113)       Save

    Taking the reform of the national park management system as reference,this paper summarizes the management mode of national parks,reasonably divides the central and local powers,and establishes the work coordination mechanism and other reform experiences,and analyzes the problems existing in the natural resource asset management system,such as the unclear division of responsibilities between the owner and the supervisor,the "exercise of ownership" system and mechanism,and the unclear boundary between the central and local powers.In order to sort out and learn from the natural resource asset management models of the United States,Germany,Japan,Russia and other countries,we put forward four measures to improve thenatural resource asset management system of national parks,including strengthening the implementation of the "two unifications" responsibility,exploring the management of property rights system,improving the ecological compensation system,and improving the purchase service system.

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    Analysis of Vegetation Cover Changes in Beijing from 2005 to 2020
    YU Shiyong, XU Qian, YU Xiaofei
    FOREST RESOURCES WANAGEMENT    2023, 0 (3): 98-104.   DOI: 10.13466/j.cnki.lyzygl.2023.03.013
    Abstract161)   HTML12)    PDF (3716KB)(143)       Save

    Based on NDVI data from 2005—2020,the spatial distribution characteristics,temporal distribution characteristics and spatio-temporal characteristics of vegetation were analysed using NDVI classification and difference analysis to reveal the spatio-temporal patterns of NDVI changes in Beijing,and to explore the reasons for the changes by analysing the vegetation cover changes in Beijing in the past 15 years.Through analysis,it is found that,the overall vegetation cover in the Beijing area is at a high level.From a regional perspective,the areas with very high NDVI mean coverage classes in Beijing from 2005 to 2020 were all located in the Jundu and Xishan mountain ranges.The vegetation coverage of Mentougou District,Huairou District,Yanqing District,Fangshan District,Changping District and Pinggu District was at the highest level in Beijing.In terms of time,the level of vegetation coverage changed significantly from 2005 to 2020,with the average annual NDVI value increasing from 0.659 0 to 0.756 6,an increase of 14.81%.The proportion of area with "very high" vegetation coverage increased from 5.31% to 47.79%,and the proportion of area with "low" vegetation coverage decreased from 5.91% to 1.25%.In terms of spatiotemporal change characteristics of vegetation,the area with obvious improvement and slight improvement accounted for more than 80%.Two "million mu afforestation" projects and mountain forest management were the main driving forces to improve the quality of vegetation coverage in Beijing.

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    Discussion on the Design and Practice of Natural Protected Area Management Platform
    GU Jie, LU Qiuling, HU Xuyao, LIU Huxiang, LIU Nan
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 36-42.   DOI: 10.13466/j.cnki.lyzygl.2023.02.005
    Abstract159)   HTML10)    PDF (1221KB)(72)       Save

    The study introduced an intelligent and integrated management system,took the management of provincial natural protected areas as a case study,explored the comprehensive information management of natural protected areas,studied the standardized construction and integrated management of multiple types and databases of natural protected areas,analyzed the characteristics of different data types of natural protected areas,and developed the natural protected areas management platform consisting of four independent module systems of data,resources,monitoring,and management according to the management needs of natural protected areas.This platform technically solves the problems of traditional managing and data updating of multiple data types in various departments,organizes and streamlines the online process of the establishment,adjustment,revocation,and construction projects of natural protected areas,and realizes the comprehensive management of natural protected areas from multiple perspectives by a single platform,which supports the intelligent and convenient management of natural protected areas and improves the comprehensive management level of natural protected areas.The built platform is applicable to the management of provincial natural protected areas.It can be extended to the management departments of natural protected areas in all provinces,promote the development of the construction and management of the national park-based natural protected area system in China.

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    Forest Vegetation Type Monitoring in the Natural Forest Protection Project Area
    WANG Xiaohui, ZHANG Huiru, PANG Yong, QIN Xianlin, LI Haikui, MENG Shili, YU Tao
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 96-103.   DOI: 10.13466/j.cnki.lyzygl.2023.02.013
    Abstract159)   HTML13)    PDF (3703KB)(103)       Save

    Based on moderate resolution remote sensing images,forest vegetation type monitoring was performed to provide technical support for achievement monitoring of the natural forest protection project area and forest vegetation mapping.Based on Landsat8 OLI images in growing and non-growing seasons,random forest and time dimension correction methods were applied to forest vegetation type monitoring in Wangqing Forestry Bureau.Based on confusion matrix and recall ratio,factors leading to classification confusion were analyzed.The results showed that:1) Overall accuracy of forest vegetation type monitoring was 86.41%,and kappa coefficient was 0.82,illustrating a better classification effect.2) Among various forest vegetation types,deciduous broadleaved forest land had high classification accuracy,with producer's and user's accuracy of over 90%,respectively.Deciduous coniferous forest land had relatively high producer's accuracy of 86.96%.Evergreen coniferous forest land and coniferous and broadleaved mixed forest land had relatively low producer's and user's accuracies of average 75.19%.Classification confusion between evergreen coniferous forest,deciduous coniferous forest,deciduous broadleaved forest,and coniferous and broadleaved mixed forest frequently occurred as the result of mixed proportion,forest canopy closure and forest age.3) Forest coverage of Wangqing Forestry Bureau was 96.64%.The area proportion of deciduous broadleaved forest land was the largest,that of coniferous and broadleaved mixed forest land was the secondly largest,and that of deciduous coniferous forest land,evergreen coniferous forest land,shrubland and other forest land was small.The analysis showed that multitemporal and phenological information of moderate resolution remote sensing images was effective in obtaining forest vegetation types of the natural forest protection project area.

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    Research Progress on Invasion and Control of Invasive Alien Plant Dolichandra unguis-cati(L.)L.G.Lohmann.
    LUO Minxian, LIN Bihua, CAI Minghui, DONG Pengmin, LI Guoqiang, LIU Bao, ZHENG Shiqun
    FOREST RESOURCES WANAGEMENT    2023, 0 (2): 126-131.   DOI: 10.13466/j.cnki.lyzygl.2023.02.017
    Abstract151)   HTML7)    PDF (1009KB)(155)       Save

    Dolichandra unguis-cati is an invasive alien vine native to tropical America.It was first introduced into cultivation as an ornamental plant,and then,with the expansion of growing areas,it has seriously harmed the urban ecological landscape and species diversity.In recent years,with the economic globalization and climate change,D.unguis-cati has shown a serious invasion in the south,especially in some major coastal cities.If not prevented,it may develop into a serious invasive species.At present,there is little research on D.unguis-cati in China,and little understanding of its characteristics.On the basis of collecting relevant literatures at home and abroad,this paper summarized and analyzed the main research status of D.unguis-cati from three aspects:reproductive strategy,growth strategy and competition strategy.The results showed that tuber propagation strategy,motility,polyembryology,low leaf building cost and litter legacy effect were the main causes of the invasion.Through research and analysis,the purpose is to reveal the origin and general characteristics of the invasiveness of D.unguis-cati,and clarify the control technology and utilization value.At the same time,this paper explored the research blank points,in order to provide a reference for further in-depth study of the invasion characteristics of D.unguis-cati,to provide a scientific basis for early warning,control and value utilization.

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