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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 Abstract （365）   HTML （11）    PDF （1144KB）（170）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics

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Spatiotemporal Trends and Influencing Factors of Forest Carbon Stock in Jiangxi Province from 2005 to 2020 LI Jiao, WANG Bing, WANG Chen, GAO He, WU Huilong, ZHENG Xin, PENG Huafu Forest and Grassland Resources Research    2024, 0 (1): 17-24.   DOI: 10.13466/j.cnki.lczyyj.2024.01.003 Abstract （190）   HTML （28）    PDF （10240KB）（200）       Knowledge map    Save Forest ecosystems play a key role in mitigating and adapting to climate change.A comprehensive understanding of the spatiotemporal trends in forest carbon stocks is essential for maintaining the regional carbon balance,predicting the potential of forest carbon stocks,adjusting conservation and management measures.Based on the three remote sensing datasets,forest carbon stock(FCS),land use cover change(LUCC)and digital elevation model(DEM),Mann-Kendall nonparametric test and correlation analysis methods were used to analyze the spatiotemporal trends of forest carbon stock and its response to land use change in Jiangxi Province from 2005 to 2020.The results showed that 1)forest carbon stock in Jiangxi Province showed an upward fluctuating trend,with an average annual growth rate of 12.59%,the minimum value appeared in 2009,which was 5.3×108tC,and the maximum value appeared in 2018,which was 6.5×108tC.2)The carbon stock is increasing in hilly areas in the central and southern parts,while it is decreasing in the lower-altitude northern parts.3)Jiangxi Province shows a decreasing trend in forest area but an increasing trend in forest carbon stocks,mainly due to urban expansion and continued sustainable forest management.4)Ecological protection and restoration measure is one of the main factors that promoting the stable increase of forest carbon stock in Jiangxi Province.In the future,the rich forest resources should be fully developed,and the synergistic efficiency of environmental protection,economic development,and poverty alleviation should be promoted through the development of Chinese Certified Emission Reduction(CCER) forestry carbon sink projects. Table and Figures | Reference | Related Articles | Metrics

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Analysis of Dominant Causes and Rescue Casualties of Forest Fires in China from 2000 to 2022 WANG Ao, WANG Chenghu, GAO Guiyun, WANG Mingyu Forest and Grassland Resources Research    2024, 0 (1): 1-7.   DOI: 10.13466/j.cnki.lczyyj.2024.01.001 Abstract （172）   HTML （32）    PDF （1400KB）（167）       Knowledge map    Save In order to analyze the main causes of forest fires and casualties in China over the past 20 years,based on the case records of forest fire fighting casualties and statistical data on relevant meteorological factors(average temperature,average precipitation,average wind speed)from 2000 to 2022,statistical analysis and correlation analysis method were used to analyze the main causes of forest fire and the main causes of casualties in fire fighting.The results showed:1)From 2000 to 2022,a total of 134,671 forest fires occurred in China.Among these the period of high incidence of forest fires was from 2003 to 2010.Severe climatic conditions were the main cause of forest fires during that period.In the past 10 years,more than 97% of forest fires have been caused by humans.In regions such as Guangxi,Yunnan,and Guizhou where agriculture and forestry are closely integrated,forest fire accidents occur frequently.2)Analysis of typical forest fire fighting cases shows that the accidents resulting in direct casualties caused by geographical environment,combustible conditions,meteorological conditions and fire activities account for the dominant part,while the casualties caused by non-indirect causes such as asphyxia,accidents and improper operation of fire fighting equipment also occasionally occurred.The research shows that the main causes of forest fires in China are meteorological factors and human factors,with casualties primarily resulting from unfavorable natural conditions.The main causes of forest fires and the causes of casualties are elaborated to provide a reference for efficient firefighting,scientific and accurate command. Table and Figures | Reference | Related Articles | Metrics

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Research on Ecotourism Standardization of Protected Areas ZHANG Bolin, QIAO Yongqiang, XU Wentong, TANG Xiaoping Forest and Grassland Resources Research    2023, 0 (5): 1-8.   DOI: 10.13466/j.cnki.lczyyj.2023.05.001 Abstract （170）   HTML （21）    PDF （1277KB）（169）       Knowledge map    Save Based on the relevant research in the field of ecotourism and analysis of the problems faced by the requirements and standardization in protected areas,the paper explained the framework and key points which the specification should focus on.According to the requirements of current policies and standardizations on the zoning of ecotourism,facility construction,recreation activities,activity management and monitoring and evaluation and other issues,the paper explained in depth that the standardization in protected areas is based on ecotourism zoning and activity control.It also stipulated corresponding content between zoning with infrastructure and service facility,and put forward relevant requirements suggestions for monitoring and management.When supplemented by supporting management measures,standardization could lead the ecotourism to a healthy development stage. Table and Figures | Reference | Related Articles | Metrics

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Green and Beautiful Guangdong Ecological Construction Demonstration Zone Digital Twin Application Research MENG Xianjin, LIN Shouming, QIN Lin, HUANG Ninghui, DING Sheng, XUE Yadong, LUO Yong, YANG Tingdong Forest and Grassland Resources Research    2023, 0 (5): 113-121.   DOI: 10.13466/j.cnki.lczyyj.2023.05.014 Abstract （166）   HTML （19）    PDF （12854KB）（63）       Knowledge map    Save In order to build a green and beautiful Guangdong ecological construction digital twin demonstration area,this articleused point cloud generated tree 3D modeling technology to conduct 1∶1 simulation of the core location trees within the demonstration area.Based on high-resolution stereo image data obtained from oblique photography,a high-precision and standard geographic 3D forest scene was constructed by combining 3D models of trees,buildings,and terrain.At the same time,the Internet of Things data from four intelligent comprehensive monitoring points was connected,and expressed in the virtual 3D forest scene,achieving deep integration between the virtual 3D forest scene and the real forest scene.Combined with the forest growth model,the future state of the forest was simulated,and an immersive interactive digital twin system integrating data collection,model establishment,simulation analysis,and future prediction was constructed.A relatively mature technical systemwas formed through research,providing technical demonstrations and solutions for the construction of a digital twin forestry map in Guangdong Province. Table and Figures | Reference | Related Articles | Metrics

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Marketization and Realization Approach of Mangrove Carbon Sink Trading YU Hongfan, SHI Zhiyuan Forest and Grassland Resources Research    2023, 0 (5): 20-28.   DOI: 10.13466/j.cnki.lczyyj.2023.05.003 Abstract （158）   HTML （13）    PDF （995KB）（85）       Knowledge map    Save In the process of coping with global warming,how to mitigate the negative effects of greenhouse effect has aroused widespread concern.Mangrove carbon sink is an important contributor to global ecosystem carbon sink,and it is also a type of carbon sink recognized by the United Nations Framework Convention on Climate Change and can be used as a clean development mechanism project,and is a breakthrough to establish China's blue carbon trading market.In practice,most of China's mangrove carbon sink trading cases are led by the government,and the problem of insufficient play of the market mechanism is still prominent.In order to give full play to the potential of mangrove carbon sink,this paper analyzed the advantages,disadvantages,opportunities and challenges of mangrove carbon sink trading,and found out that mangrove carbon sink trading possessed strong development potential,and putforward relevant suggestions on constructing the marketization path of mangrove carbon sink trading in China,so as to promote the sustainable development of mangrove carbon sink trading in China. Table and Figures | Reference | Related Articles | Metrics

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Research on Pathways and Strategies for the Value Realization of Forest,Grassland and Wetland Carbon Sink Products LI Qing, GOU Lihui, ZHENG Qianhui, YANG Yu, XIA Chaozong Forest and Grassland Resources Research    2023, 0 (6): 18-26.   DOI: 10.13466/j.cnki.lczyyj.2023.06.003 Abstract （149）   HTML （8）    PDF （1094KB）（141）       Knowledge map    Save Realizing the value of forest,grassland and wetland carbon sink products is a crucial means of realizing ecological product value.Accelerating the realization of value in these products not only incentivizes market entities to engage in ecological environment protection but also contributes to social welfare by driving employment and income growth.Furthermore,it enhances the carbon sink function of ecosystems,thereby supporting the achievement of "dual carbon" goals.Under the impetus of national policies related to ecological restoration and the realization of ecological product value,the pathways for realizing the value of forest,grassland and wetland carbon sink products have continuously evolved and developed.Throughout the country,various regions have explored and established a series of distinctive and replicable pathways and models for realizing the value of these products.This paper reviews the main pathways for realizing the value of forest grassland and wetland carbon sink products,including ecological compensation,carbon trading,innovative developments in carbon finance,and social capital participation in carbon sequestration and sink enhancement.By incorporating the latest statistical data and typical case studies,the paper objectively reflects China's research progress in promoting the value realization of forest grassland and wetland carbon sink products.It analyzes the challenges faced in realizing the value of these products and proposes strategies and recommendations to facilitate their value realization. Reference | Related Articles | Metrics

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Wildlife Video Object Detection Based on Deep Learning WANG Shuai, LU Nan, ZHENG Hong, LI Hui, PENG Jiangui, ZHANG Tong, WEI Yanhua Forest and Grassland Resources Research    2024, 0 (1): 34-40.   DOI: 10.13466/j.cnki.lczyyj.2024.01.005 Abstract （144）   HTML （16）    PDF （4274KB）（79）       Knowledge map    Save Ecological sensing terminals represented by infrared cameras provide massive amounts of image and video data for wildlife monitoring research.To improve the problems of low timeliness and limited processing ability in manual recognition of massive data,and to solve the uncertainty of object detection models in practical scenarios affected by multiple factors such as complex backgrounds,multiple targets,light and dark,a wildlife object detection dataset was established using leopard,adult male bharal,and non-adult male bharal as examples.Four classic object detection models,Faster R-CNN,SSD,YOLOv5,and YOLOv8,were compared and analyzed in terms of detection accuracy,detection speed,and detection effectiveness in actual scenarios.The results show that the detection effect and speed of YOLOv5 and YOLOv8 are overall better than Faster R-CNN and SSD.1)YOLOv8 has higher detection accuracy and stronger robustness under multiple interference factors,making it more suitable for scenarios that pursue detection results;2)All four models can meet the real-time video detection needs of ecological perception terminals,but the YOLOv5 model is the lightest and has the fastest detection speed,making it more suitable for scenarios with limited computability that pursue detection speed.YOLOv5 and YOLOv8 have superior performance and are suitable for detecting wildlife video targets in practical scenarios. Table and Figures | Reference | Related Articles | Metrics

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Evaluation of Coupling Coordination Between Protected Areas and Rural Communities on the Qinghai-Xizang Plateau:A Case Study of Qinghai Province LIU Nan, LU Qiuling, ZHAO Li, XU Dongping, ZHAO Zhuoyan, YANG Zhijie Forest and Grassland Resources Research    2023, 0 (5): 9-19.   DOI: 10.13466/j.cnki.lczyyj.2023.05.002 Abstract （137）   HTML （13）    PDF （3915KB）（117）       Knowledge map    Save The healthy development of protected areas on the Qinghai-Xizang Plateau has an important role in promoting the comprehensive construction of protected areas system with national parks as the main body.Studying the development status of protected areas and rural communities on the Qinghai-Xizang Plateau and comprehensively evaluating their coordinated development relationship are of great significance for promoting the construction of protected areas system and the revitalization of rural communities.Taking Qinghai Province as an example,we analyzed the principle of the interaction mechanism between protected areas and rural communities,and used the coupling and coordination evaluation model to carry out research on the coupling and coordination between protected areas and rural communities in five typical protected areas on the Qinghai-Xizang Plateau.The results of the study showed that:1)the construction of protected areas and the revitalization of rural communities are of equal importance;2)the coupling relationships between 5 protected areas and rural communities showed different trends;3)most of the 5 protected areas are highly coordinated with rural communities and showed a benign development trend;and a few protected areas had poor coupling and coordinated development with rural communities.Through this study,we hope to provide references for promoting the integration and development of protected areas and rural communities on the Qinghai-Xizang Plateau. Table and Figures | Reference | Related Articles | Metrics

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Current Situation and Outlook of the Construction of Forest and Grassland Fire Prevention Infrastructure under the New Situation LU Yuan, WANG Guangyu, CHENG Ziyue, YAN Yuqian, ZHANG Heng, WANG Li, YANG Hui, ZOU Quancheng Forest and Grassland Resources Research    2023, 0 (6): 1-7.   DOI: 10.13466/j.cnki.lczyyj.2023.06.001 Abstract （136）   HTML （15）    PDF （1170KB）（116）       Knowledge map    Save Forest and grassland fire prevention is a major issue related to safety and development,and a major task for the protection of forest and grass resources.Infrastructure is the hard power of forest and grassland fire prevention work.Strengthening the construction of fire prevention infrastructure and the level of equipment allocation is the fundamental solution to comprehensively improve the comprehensive prevention and control capability of forest and grassland fires in China.This paper put forward the construction idea of how to build forest grassland fire prevention infrastructure under the new situation and made a brief overview of the construction content of related projects,aiming at strengthening the forest grassland fire prevention infrastructure construction.Approaches were provided to for effectively preventing and responding to the threat of forest and grassland fires,especially major fires,as well as for improving the comprehensive prevention and control capacity of forest and grassland fires. Table and Figures | Reference | Related Articles | Metrics

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The Franchising Development Path of the Hainan Tropical Rainforest National Park Based on the Recreation Opportunity Spectrum GENG Songtao, SUN Kexin, SONG Liangan, YAN Rong Forest and Grassland Resources Research    2024, 0 (1): 8-16.   DOI: 10.13466/j.cnki.lczyyj.2024.01.002 Abstract （131）   HTML （13）    PDF （1138KB）（83）       Knowledge map    Save The establishment of a national park system is a key reform task put forward by the Third Plenary Session of the 18th CPC Central Committee.It is an important element in the systems for promoting ecological progress.Exploring the path of high-quality development of national park franchising is of great significance in promoting the transformation and upgrading of national park recreation,improving quality and efficiency,and promoting the construction of China ecological civilization.It takes Hainan Tropical Rainforest National Park as the research object.Based on the theory of recreation opportunity spectrum,it clarifies the relationship between the utilization of recreation opportunities and franchising.Applying the factor analysis method and group decision-making hierarchical analysis method,it constructs the evaluation indicator system of recreation opportunities to evaluate the recreation opportunity levels of the seven areas of Hainan Tropical Rainforest National Park.The recreation opportunity spectrum of Hainan Tropical Rainforest National Park has been formalized.The high-quality development path of franchise in Hainan Tropical Rainforest National Park is proposed to reconstruct the franchise mode,enhance the effectiveness of management services,optimize the fund management system,establish a common sharing mechanism,and improve the multi-dimensional supervisory system.This is aimed at providing scientific guidance and useful references for the franchise of national parks and realizing the value-added of the brand of national parks. Table and Figures | Reference | Related Articles | Metrics

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Assessment of Ecosystem Services in Helan Mountain National Nature Reserve in Ningxia LI Huijie, LI Wanting, WANG Bing, NIU Xiang, LIANG Yongliang, LI Jingyao Forest and Grassland Resources Research    2024, 0 (1): 25-33.   DOI: 10.13466/j.cnki.lczyyj.2024.01.004 Abstract （126）   HTML （16）    PDF （3713KB）（142）       Knowledge map    Save Ecosystem service functions can promote harmony between human and nature.Exploring the ecosystem service functions of Helan Mountain National Nature Reserve is of great significance for adopting a holistic approach to conserving and management our mountains,rivers,forests,farmlands,lakes,grasslands,and deserts.Based on a series of national standards for long-term observation research and service function evaluation of forest and grassland ecosystems,as well as applying a distributed calculation method based on forestry compartment data,we selected five forest and grassland ecosystem service functions,namely,soil conservation,forest nutrient sequestration,water conservation,carbon sequestration and oxygen release,atmospheric purification to assessed their benefits in terms of physical quality and value quantity.The results show that the physical quality of forest and grassland ecosystem services in the Helan Mountain National Nature Reserve in Ningxia present present a spatial distribution pattern of high in the northeast and low in the southwest;the total value is 2.827 billion yuan/a,of which the functions of water conservation and soil conservation in the top two.There are the main services function of forest and grassland ecosystems in Ningxia Helan Mountain national Nature Reserve.The Helan Mountain National Nature Reserve should further strengthen forest management,optimize tree species and age structures,enhance the quality of forest ecosystems,and fully leverage the ecosystem services. Table and Figures | Reference | Related Articles | Metrics

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Study on Spatio-Temporal Distribution Characteristics and Susceptibility Analysis of Forest Fire ZHANG Guoli, CI Xuelun, YANG Xueqing, JIANG Chunying, SUN Zhichao, MENG Haiding Forest and Grassland Resources Research    2023, 0 (5): 48-55.   DOI: 10.13466/j.cnki.lczyyj.2023.05.006 Abstract （126）   HTML （4）    PDF （1424KB）（96）       Knowledge map    Save The situation of forest fire prevention in China is severe.Analyzing and studying the spatial-temporal characteristics and susceptibility of forest fire can provide scientific basis for forest fire prevention.Based on the data of the first national forest and grassland fire risk survey,the temporal and spatial distribution characteristics of forest fire in China's 31 provinces during 2011—2020 were analyzed,and the forest fire susceptibility model in China's 31 provinces was established by using the random forest algorithm through the construction of forest fire driving factors such as fuel,meteorological conditions and terrain.The results were as follows:1)The interannual change of the frequency and burned areas of forest fire in 31 provinces showed a downward trend from 2011 to 2020.The difference was significant in different geographical regions.Forest fires in winter and spring accounted for 85.48%.2)The fuel load per unit area is the most important driving factor of forest fire susceptibility,followed by monthly mean temperature,monthly minimum relative humidity and monthly mean precipitation.3)Receiver operating characteristic curve(ROC),area under curve(AUC)and accuracy(ACC)were used to analyze the accuracy of the prediction model.The values of AUC and ACC were 0.87 and 0.84,respectively,indicating a high accuracy of the susceptibility model.4)The forest fire susceptibility in China's 31 provinces had obvious regional differences.Northeast,Southwest and East China were dominated by high and medium-high susceptibility levels,Central China and South China were dominated by medium-low susceptibility levels,and North and Northwest China were dominated by low and very low susceptibility levels. Table and Figures | Reference | Related Articles | Metrics

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Analysis of Resource Characteristics and Spatial Distribution Characteristics of Ancient Trees ZHANG Zhongyi, LIU Huijiao, CHU Rongrong, FENG Guoqing, DONG Jiaxin, GAO Xiangbin, LYU Mengyuan, CHEN Guohao Forest and Grassland Resources Research    2023, 0 (5): 105-112.   DOI: 10.13466/j.cnki.lczyyj.2023.05.013 Abstract （125）   HTML （7）    PDF （4855KB）（131）       Knowledge map    Save In order to explore the characteristics of ancient tree resources,the types of spatial distribution and the factors affecting their distribution characteristics,it is better to serve the urban and rural ecological environment and the construction of beautiful villages.Taking the ancient tree resources in Liaocheng City as an example,through the fishing net analysis and nuclear density analysis in ArcGIS,the spatial distribution type and distribution density of ancient tree resources were studied,and the land cover type and population density was analyzed.The influence of traditional villages and ancient tree culture on the distribution of ancient trees.The results showed that there were 687 ancient trees in Liaocheng City,including 65 first-class ancient trees,79 second-class ancient trees and 543 third-class ancient trees.The dominant species were Platycladusorientalis,Styphnolobium japonicum and Ziziphus jujuba.The tree height,DBH and crown width were concentrated in >10.0~15.0 m,<1.0 m,>5.0~10.0 m,respectively.The number of normal plants accounted for 71.47 % of the total number of plants,and the number of weak plants accounted for 23.73 % of the total number of plants;the spatial distribution type of ancient trees was aggregated distribution,including 1 high-density area and 6 sub-density areas.The overall distribution pattern of ancient trees was “more in the south and less in the north”,“scattered and multi-group”.Through the research and analysis,it is expected to provide reference for the management and protection of ancient trees in Liaocheng City,and provide decision-making basis for the construction of beautiful villages. Table and Figures | Reference | Related Articles | Metrics

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Remote Sensing Inversion of Mangrove Biomass Based on Machine Learning HAO Jun, LYU Kangting, HU Tianqi, WANG Yunge, XU Gang Forest and Grassland Resources Research    2024, 0 (1): 65-72.   DOI: 10.13466/j.cnki.lczyyj.2024.01.009 Abstract （122）   HTML （20）    PDF （3014KB）（119）       Knowledge map    Save Accurately investigating mangrove biomass is beneficial for evaluating the carbon sink potential of mangrove ecosystems.Based on field survey data,Landsat 8 remote sensing images and DEM data,22 feature variables were extracted to carry out remote sensing inversion of mangrove biomass in the Ximen Island,which used three machine learning methods:Random Forest(RF),Support Vector Machine model(SVM)and eXtreme Gradient Boosting(XGBoost).The results showed:1)Compared to the RF model and SVM model,the XGBoost model had a better estimation performance(R2=0.932,ERMS=0.514 t/hm2,EMA=0.313 t/hm2),which could more accurately estimate the mangrove biomass.2)Among the 10 important characteristic factors selected by Recursive Feature Elimination(RFE),the vegetation index has a relatively high importance in estimating mangrove biomass.3)The biomass inversion map of the XGBoost model,which is composed of 10 important characteristic factors,showed that the estimated mangrove biomass ranges from 9.138 to 29.229 t/hm2,which was similar to the findings of the field survey.It can be seen that the XGBoost algorithm shows good application capabilities in mangrove biomass.This research will provide a technical reference for the accounting of carbon storage in the Chinese mangroves. Table and Figures | Reference | Related Articles | Metrics

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Analysis and Research on the Docking Scheme of Forest Stock Data Between Continuous Inventory of Forest Resources and Forest Resource Planning and Design Investigation BAI Xingwen, HU Sheng, BU Rigude, YANG Fan Forest and Grassland Resources Research    2023, 0 (5): 142-147.   DOI: 10.13466/j.cnki.lczyyj.2023.05.017 Abstract （119）   HTML （7）    PDF （984KB）（145）       Knowledge map    Save Because of the different purposes and methods of the two monitoring systems,namely the continuous forest resources inventory and forest management inventory,the data of forest resources obtained by the two monitoring systems are inconsistent.In view of this,this paper took Baoding City as an example to carry out analysis and research on the docking scheme of forest stock data between continuous forest resources inventory and forest management inventory.In order to obtain the forest stock information of each county(city and district)in Baoding city,thesubcompartment stock volume prediction model was constructed by using nonlinear index model and tree species groups.The adjustment method was adopted to realize the connection between the continuous inventory of forest resources and the monitoring value of the forest resources planning and design investigation.The results showed as follows:1)the evaluation indexes of the subcompartment stock volume prediction model developed based on tree species groups all performed well,indicating that the model had good prediction ability;2)Compared with the forest management inventory,the forest stockper unit(34.98 m3/hm2)of Baoding City monitored by the subcompartment stock volume prediction modelshowed an accuracy of 91.06% with the monitoring valueof thecontinuous forest resource inventory stock,which greatly reduced the relative error,indicating the reliability of the monitoring value of the subcompartment stock volume prediction model;3)After further adjustment of the model prediction,the connection between the continuous forest resources inventory and forest management inventory was finally realized,indicating the feasibility of the research scheme.The technical scheme studied in this paper can provide technical reference for updating the monitoring data of subcompartment stock volumein all provinces over the years and realizing "one set of data,one piece of map" in the future. Table and Figures | Reference | Related Articles | Metrics

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The Value,Existing Problems and Development Suggestions of China's National Park Concession System WANG Tianwei, LIU Rui Forest and Grassland Resources Research    2023, 0 (6): 8-17.   DOI: 10.13466/j.cnki.lczyyj.2023.06.002 Abstract （115）   HTML （12）    PDF （1039KB）（108）       Knowledge map    Save The national park concession system is an innovation of Chinese government concessions in the field of ecological civilization construction,which not only injects funds into the construction of national parks,but also improves the quality of public services through market competition mechanism.It not only implements the basic goal of the public interest of national parks to protect the ecological environment,but also protects the personal interests of indigenous residents.However,in the process of implementation,the national park concession system still faces problems such as the questionable nature of the concession agreement,the defects of the access mechanism and the lack of systematic regulation of the exit mechanism,which hinders the effectiveness of the concession system.On this basis,the franchise agreement should be given the dual nature of both "administrative" and "civil",with an administrative license at the stage of agreement conclusion and a civil contract at the stage of agreement implementation;The franchise access mechanism should be further improved by establishing a franchise management advisory committee,restricting the use of priority renewal rights,and introducing a "negative list" management model.And through the establishment of a temporary takeover system,improve the franchise supervision system and other ways to establish an exit mechanism. Reference | Related Articles | Metrics

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Advances in Remote Sensing Retrieval of Forest Aboveground Biomass REN Xiaoqi, HOU Peng, CHEN Yan Forest and Grassland Resources Research    2023, 0 (6): 146-158.   DOI: 10.13466/j.cnki.lczyyj.2023.06.018 Abstract （112）   HTML （12）    PDF （1148KB）（110）       Knowledge map    Save Forest aboveground biomass is one of the key indicators to reflect the status of forest ecosystem,which is of great significance to global climate change and China's carbon peak and carbon neutrality.With the rapid development and increasing maturity of remote sensing technology,it has become the main technical means for retrieving above-ground forest biomass in large areas.In this paper,the research progress of remote sensing inversion of forest aboveground biomass was discussed from two aspects through systematic review of relevant literatures at home and abroad.From the perspective of data source,it can be summarized as inversion methods of optical remote sensing data,synthetic aperture radar data and LiDARdata,and the effective information,advantages and limitations provided by each data source are expounded and analyzed.From the perspective of inversion model,it can be summarized as multiple regression model,machine learning algorithm and mechanism model,and the characteristics of different models are discussed and analyzed combined with practical application cases.Finally,this paper summarized the existing problems in the inversion of forest above-ground biomass by remote sensing,and prospected the direction and hotspots of forest above-ground biomass inversion by remote sensing in the future. Table and Figures | Reference | Related Articles | Metrics

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Economic Analysis on Optimal Rotation Period of Larix principis-rupprechtii under Climate Change Scenarios WANG Xiaohan, HE Xiao, SHI Jingning Forest and Grassland Resources Research    2023, 0 (5): 40-47.   DOI: 10.13466/j.cnki.lczyyj.2023.05.005 Abstract （111）   HTML （20）    PDF （1365KB）（144）       Knowledge map    Save An improved understanding of the factors affecting the optimal rotation period and the maximum land expected value of Larix principis-rupprechtii is essential under climate change scenarios and can help managers adopt adaptive forest management strategies in considering both carbon sequestration and timber production.In the current study,inventory data of 108 sample plots collected from the 6th to 8th National Forest Inventories were used to develop Faustmann models for larch plantations in northern China.The effects of timber price,carbon price,and discount rate on optimal rotation period and land expected value were then analyzed based on the resulting Faustmann model.The results showed that:1)the optimal rotation period was 27 years for larch plantations under the baseline scenario.Both the optimal rotation period and land expected value decreased with increasing carbon emission concentration;2)timber price fluctuations didn’t change the optimal rotation period.The increase in carbon price can prolong the optimal rotation period.Specifically,for every 100-yuan increase in carbon sink per ton,the optimal rotation period will be extended by one year;3)the optimal rotation period and land income decreased with increasing discount rate.In the context of global climate change,it is necessary to develop optimal rotation models that consider climate factors for plantations,thereby reducing the uncertainty in future decision-making of carbon sink management. Table and Figures | Reference | Related Articles | Metrics

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Plant Diversity and Influencing Factors on Different Plant Community in Zengcheng Forest Farm XIE Zhuohong, CHEN Peitong, FU Shipei, CHEN Anjun, LI Wei, LIANG Xinling, LEI Min, LIU Ping Forest and Grassland Resources Research    2023, 0 (5): 63-71.   DOI: 10.13466/j.cnki.lczyyj.2023.05.008 Abstract （108）   HTML （3）    PDF （1301KB）（132）       Knowledge map    Save Firstly,based on 50 standard survey data,TWINSPAN method was used to classify 50 standard communities into different community types.Secondly,the α-diversity and β-diversity of different community types were analyzed to determine the difference of plant diversity among different community types.Finally,using redundancy analysis,plant diversity and influencing factors of different plant communities in Zengcheng Forest Farm were explored.The results showed as follows:1)The plants in Zengcheng Forest Farm included 84 families,189 genera and 270 species,which could be divided into 10 plant communities,among which the dominant communities were "Ass.Machilus chinensis+Schima superba+Lophatherum gracile","Ass.Castanopsis fissa+Heptapleurum heptaphyllum+Psychotria asiatica" and "Ass.Cunninghamia lanceolata+Schima superba+Lophatherum gracile".2)There were significant differences in α-diversity among different plant community types.The α-diversity was the most abundant in the community of "Ass.Mallotus paniculatus+Heptapleurum heptaphyllum+Blechnopsis orientalis" and the community of "Ass.Cunninghamia lanceolata+Schima superba+Lophatherum gracile",followed by the community of "Ass.Machilus chinensis+Schima superba+Lophatherum gracile",and the community of "Ass.Eucalyptus grandis x urophylla+Microstegium vimineum" was the simplest.Compared with other communities,the average β-diversity index of the community of "Ass.Machilus chinensis+Schima superba+Lophatherum gracile" was the highest,indicating the least interspecific competition and the strongest community stability.3)Stand cover and dominant tree species had significant effects on plant diversity,while stand density and altitude had significant effects on plant diversity.In summary,the comprehensive plant diversity of "Ass.Machilus chinensis+Schima superba+Lophatherum gracile" was the best.By adjusting the stand density of the dominant tree species to optimize the stand structure,the stand can be transformed in the direction of "Ass.Machilus chinensis+Schima superba+Lophatherum gracile" in forest management activities,so as to further enrich the plant diversity and enhance the system stability. Table and Figures | Reference | Related Articles | Metrics