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Key Data Results and Trend Analysis of the Sixth National Survey on Desertification and Sandification ZAN Guosheng, WANG Cuiping, LI Feng, LIU Zheng, SUN Tao FOREST RESOURCES WANAGEMENT    2023, 0 (1): 1-7.   DOI: 10.13466/j.cnki.lyzygl.2023.01.001 Abstract （6058）   HTML （447）    PDF （1091KB）（4133）       Knowledge map    Save The Sixth National Survey on Desertification and Sandification was based on the results of the Third National Land Survey,using 2019 as the benchmark year.The results showed a comprehensive status of desertification and sandification in China.This paper presented a brief overview of this survey,the status and dynamic changes of desertification and sandification in China,conducted a comprehensive analysis of the current situation,and proposed some suggestions for combating desertification and sandification.The survey results showed that,until 2019,the desertification land area in China was 257.371 3 million hm2 and the sandification land area was 168.782 3 million hm2.Compared with 2014,the desertification area of China decreased by 3.788 0 million hm2 with an average annual decrease of 757.6 thousand hm2.The sandification area of China decreased by 3.335 2 million hm2 with an average annual net reduction of 667 thousand hm2. 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 （1299）   HTML （71）    PDF （1400KB）（646）       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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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 Abstract （1203）   HTML （50）    PDF （972KB）（2394）       Knowledge map    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 ". Table and Figures | Reference | Related Articles | Metrics

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Advances in Research on Plant Carbon Sequestration Capacity Across Different Vegetation Zones in China LIU Tong, BAO Shouchen, YUAN Tao Forest and Grassland Resources Research    2024, 0 (4): 12-20.   DOI: 10.13466/j.cnki.lczyyj.2024.04.002 Abstract （1160）   HTML （18）    PDF （993KB）（333）       Knowledge map    Save Plants serve as the primary carbon sink carriers in terrestrial ecosystems and are of great significance for maintaining ecological balance.Systematic analysis of the measurement methods of the whole plant carbon sink(plot inventory method,assimilation method,remote sensing estimation method,microclimate method)and its advantages and disadvantages,as well as scope of application.Using the widely adopted assimilation method,compared and analyzed the carbon sink capacity of plants in six vegetation zonesin China,considering plant growth forms,ecological habits,and environmental factors.The results revealedsignificant variations in the carbon sink capacity of plants across different vegetation zones.In the temperate coniferous broad-leaved mixed forest area and the warm temperate deciduous broad-leaved forest zones,trees exhibited slightly higher carbon sink capacities than shrubs.Conversely,in the tropical monsoon rain forest and temperate grassland zones,shrubs demonstrated significantly higher carbon sink capacities than trees.In addition,there are significant differences in carbon sink capacity between coniferous and broadleaved trees.Aquatic and ground cover plants exhibit substantial potential for carbon sink,and have the possibility of further development.The study also indicated that carbon sink measurement methods and environmental factors significantly influence the evaluation ofplant carbon sink capacity.Based on the findings,it is recommended to establish a unified evaluation standard for carbon sink capacity,broadenthe scope of plant species and research coverage,and develop a more comprehensive framework for evaluating and enhancing carbon sink capacities across vegetation zones.Such efforts canprovide scientific guidance for ecological restoration,landscape tree species selection,andachieving carbon neutrality targets. Table and Figures | Reference | Related Articles | Metrics

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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 Abstract （1142）   HTML （80）    PDF （1248KB）（1961）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics

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Research on the Plot Survey and Load Estimation of National Forest Fuels YANG Xueqing, SUN Zhichao, CHAI Zheng, QIU Yiwen, JIANG Chunying FOREST RESOURCES WANAGEMENT    2022, 0 (6): 1-6.   DOI: 10.13466/j.cnki.lyzygl.2022.06.001 Abstract （1064）   HTML （76）    PDF （934KB）（525）       Knowledge map    Save From the viewpoint of tediousness and professionalism of forest fuel load investigation,a stratified sampling system for the plot survey of forest fuel loads at national and provincial scale were developed based on five commonly used indicators,namely vegetation area,tree species,stand origin,age group and canopy density.Within each specific plot,the fuel loads of tree-layer can be estimated by using the data of individual tree survey combined with the algometric biomass model or the biomass expansion factor,while fuel loads of shrub-,herb-,litter- and humus-layer should be jointly estimated by the quadrat survey and the data of sample moisture content.This method has important guidance and reference significance for the survey and estimation of forest fuel loads at national or regional scale. Table and Figures | Reference | Related Articles | Metrics

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Characteristics and Influencing Factors of Soil Organic Carbon in Typical Vegetation in the Qilian Mountains JIANG Shengxiu, ZHAO Peng, ZHANG Junnian, LI Delu, LIU Zixi Forest and Grassland Resources Research    2024, 0 (2): 1-7.   DOI: 10.13466/j.cnki.lczyyj.2024.02.001 Abstract （969）   HTML （35）    PDF （1521KB）（366）       Knowledge map    Save By exploring the spatial distribution characteristics and influencing factors of soil organic carbon in the typical vegetation of the Qilian Mountains,we aimed to provide a scientific basis for evaluating the carbon sequestration effects of forest soil in the region.Using converted cultivated land as a control,five typical vegetation types were studied:grassland,natural trees(Picea crassifolia,Sabina przewalskii),artificial trees(Larix gmelinii)and shrub.Soil organic carbon content,organic carbon density,soil grades,pH,electrical conductivity,total nitrogen,total potassium,and total phosphorus were measured at depths of 0-100 cm compare and analyze the distribution differences and main influencing factors of organic carbon components in different vegetation soils.Results showed:1)The average soil organic carbon content and organic carbon density under different vegetation types were as follows:P.crassifolia(5.99 g/kg,3.43 kg/m2,respectively)>S.przewalskii(5.59 g/kg,2.76 kg/m2,respectively)>L.gmelinii(2.91 g/kg,2.16 kg/m2,respectively)>shrub(1.83 g/kg,2.08 kg/m2,respectively)>grassland(1.66 g/kg,2.00 kg/m2,respectively)>abandoned lands(1.16 g/kg,1.33 kg/m2,respectively).2)With soil layer deepening,the overall organic carbon content of different vegetation soils tended to decrease,while the density of soil organic carbon showed a trend of first increasing and then decreasing.3)In the 0-100 cm soil layer,the soil C/N content of different vegetation types ranged from 9.30 to 15.73,with mean values as follows:P.crassifolia(14.96)>grassland(11.66)>abandoned land(11.54)>shrub(10.83)>L.gmelinii(10.69)>S.przewalskii(10.63).4)Organic carbon and total nitrogen content in different vegetation types showed a highly significant positive correlation(P<0.01),and a highly significant or significant positive correlation with total phosphorus,clay,and silt(P<0.01,P<0.05),a highly significant or significant negative correlation with sand content(P<0.01,P<0.05),and a significant negative correlation with pH(P<0.05).Thus the soil organic carbon retention capacity of natural trees in the Qilian Mountains is superior.Future carbon sequestration forestry construction should consider factors affecting soil organic carbon and prioritize dominant vegetation. Table and Figures | Reference | Related Articles | Metrics

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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 Abstract （898）   HTML （22）    PDF （3716KB）（759）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics

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Resources and Growth Characteristics of Ancient Ficus microcarpa in Hainan LIN Ling, CHEN Feifei, HUANG Chuanteng, HONG Wenjun, ZHANG Mengwen FOREST RESOURCES WANAGEMENT    2023, 0 (3): 121-127.   DOI: 10.13466/j.cnki.lyzygl.2023.03.016 Abstract （898）   HTML （8）    PDF （1573KB）（385）       Knowledge map    Save The study used a combination of literature collection and field plant investigation to conduct a systematic of and study ancient Ficus microcarpa resources in Hainan Province.The resource status,distribution pattern,and growth characteristics of ancient F.microcarpa were analyzed,and a tree age-height model was constructed to reveal the senescence mechanism of ancient F.microcarpa in Hainan,and to provide theoretical and practical basis for the daily maintenance management and rejuvenation of ancient F.microcarpa.The results showed that a total of 3 715 ancient F.microcarpa were recorded in Hainan Province,distributed in cluster.Haikou City and Lingao County had a higher distribution of trees,accounting for 48.7% of the total number of trees;the countryside is the main distribution area of Hainan ancient F.microcarpa,accounting for 92.84% of the total number of trees.Most of the ancient F.microcarpa also had good growth status and site conditions,and their age,diameter at breast height and height structure are normally distributed,and a logistic model equation of y=1.369/(1+7.053e-2.852x)(R2=0.998) was fitted to represent the relationship between age and height of ancient Ficus microcarpa.The results of leaf physiological tests showed that the chlorophyll content and SOD enzyme activity of the normal plant of ancient F.microcarpa were higher than those of the weakened plant,but the MDA content was lower than that of the weakened plant,indicating that the chlorophyll content,SOD enzyme activity and MDA content of the plant can be used as one of the physiological indicators to determine the senescence of ancient trees. Table and Figures | Reference | Related Articles | Metrics

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Research on Estimating Forest Stock Volume via Airborne LiDAR Data QIU Jie, LI Qiannan, YU Yao FOREST RESOURCES WANAGEMENT    2023, 0 (1): 153-160.   DOI: 10.13466/j.cnki.lyzygl.2023.01.018 Abstract （890）   HTML （10）    PDF （1641KB）（264）       Knowledge map    Save Aiming at the problem that the traditional second-class survey method of forest resources is time-consuming and laborious,it is difficult to meet the needs of forest resource dynamic monitoring under the new situation.Three forest farms in Liuhe District,Nanjing city were selected as the study area in this paper.Sparse airborne laser radar was used to extract feature parameters,combined with the data of Forest Management Inventory.Two algorithms,stepwise regression and Boruta,were used for factor screening.Three modeling methods including Stepwise Multiple Linear Regression (SMLR),Support Vector Machine (SVM) and Random Forest (RF) were compared to estimate the forest stock.The results showed that:1) Height factor was the main characteristic parameter affecting forest stock volume;2) SVM and RF algorithms performed better in model fitting and verification accuracy,SVM algorithms performed slightly inferior to RF algorithms in mixed forests,and stepwise regression methods performed poorly.In general,the modeling results of lidar extraction factor and forest stock were good,and Sparse airborne laser radar had good applicability to forest resource survey,which provided a new idea for forest resource survey in the future. Table and Figures | Reference | Related Articles | Metrics

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Analysis of Timber Forest Resources Status and Timber Safety Analysis in China ZENG Weisheng, YANG Xueyun FOREST RESOURCES WANAGEMENT    2023, 0 (1): 17-24.   DOI: 10.13466/j.cnki.lyzygl.2023.01.003 Abstract （863）   HTML （39）    PDF （1531KB）（439）       Knowledge map    Save Along with continuous and rapid development of economic construction in China,the rigid demand of timber is increasing continuously,and the issue of timber safety is extensively concerned.Based on the results of previous national forest inventories of China,the basic situation of timber resources,such as ownership,origin,age group and tree species,and distribution characteristics and development trends of timber resources in China were firstly described.Then,the timber production in the past 70 years,current timber demand and timber safety were analyzed.Finally,some suggestions were put forward on ensuring timber safety from following five aspects:building national reserve forest base,cultivating precious-species and large-diameter timber forests,strengthening scientific forest management,advocating timber saving and substitution,and guiding and regulating timber import. Table and Figures | Reference | Related Articles | Metrics

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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 Abstract （860）   HTML （22）    PDF （1228KB）（1529）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics

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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 Abstract （855）   HTML （24）    PDF （1271KB）（2505）       Knowledge map    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. Table and Figures | Reference | Related Articles | Metrics

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Research on the Construction of the Evaluation Index System for the Degradation Degree of Mangrove Wetland Ecosystem in Hainan SU Shaofeng, LIN Zhipan, WANG Xiaoyan, LEI Xiangling, XUE Yang FOREST RESOURCES WANAGEMENT    2022, 0 (6): 54-60.   DOI: 10.13466/j.cnki.lyzygl.2022.06.009 Abstract （829）   HTML （23）    PDF （915KB）（704）       Knowledge map    Save Using the "pressure-state-response (PSR)" model,this paper constructed an evaluation index system for the degradation degree of mangrove wetland ecosystem in Hainan according to the causal logical relationship of mangrove wetland degradation.Combined with the status and characteristics of Hainan mangrove wetland ecosystem,23 evaluation indicators were screened out,and three typical mangrove wetland ecosystems in Hainan were selected to evaluate the degree of degradation.The results showed that the three mangrove wetland ecosystems in Hainan had different degrees of degradation.The Dongzhaigang mangrove and Bamenwan mangrove were in mild degradation,while the Huachangwan mangrove was in moderate degradation. Table and Figures | 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 （823）   HTML （25）    PDF （1148KB）（5463）       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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Assessment of Forest Ecosystem Services Vlaue in the Qilian Mountain National Nature Reserve LIU Bingcang, YANG Haijiang Forest and Grassland Resources Research    2024, 0 (3): 18-24.   DOI: 10.13466/j.cnki.lczyyj.2024.03.003 Abstract （802）   HTML （28）    PDF （1361KB）（580）       Knowledge map    Save The assessment of forest ecosystem service value and its changes is of great practical significance for the protection and management of forest ecosystems,and can provide a reference for achieving regional economic-social-ecological synergistic development.Based on remote sensing data and related mapping data,the ecosystem service value(ESV)accounting method was used to assess the forest ecosystem service function of Qilian Mountain National Nature Reserve and identify its hotspots of change from 1980 to 2020.The results show that:1)Qilian Mountain National Nature Reserve is rich in forest resources,with a total forest area of about 636 600 hm2 and a forest coverage rate of 14.44%.Over time,the overall area has shown an increasing trend over the past 40 years,with a total increase of about 11,300 hm2 and a growth rate of 1.81%.2)The forests in the reserve possess great ecosystem service value,and from the perspective of time change,the ESV increased from 45 444 000 000 Yuan to 60 628 000 000 Yuan from 1980 to 2020,with a growth rate of 33.41%,which has shown an obvious increasing trend.From the perspective of the ESV contribution of different ecosystem types,forested land>shrubland>thin forest land>other forest land.In terms of specific ecosystem service values,soil conservation>water conservation>flood storage>tourism and cultural services>carbon sequestration>windbreaks and sand solidification>forest product production.3)Based on the prediction of hotspot areas of ecosystem service function and value change in the reserve,the value of regulating services is extremely vulnerable to the ecosystem change.The hotspot areas for the value change of provisioning services and cultural services remain stable in general,while areas prone to decrease account for 44.21% of the total protected area,which requires close attention.The results of the study provide important scientific insights for forest ecosystem assessment in Qilian Mountain National Nature Reserve. Table and Figures | Reference | Related Articles | Metrics

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Progress on Hyperspectral Remote Sensing Inversion Method for Vegetation Chlorophyll Content MA Rongfei, CHEN Yan, HOU Peng, REN Xiaoqi Forest and Grassland Resources Research    2024, 0 (5): 166-178.   DOI: 10.13466/j.cnki.lczyyj.2024.05.018 Abstract （796）   HTML （18）    PDF （1158KB）（358）       Knowledge map    Save Chlorophyll content is crucial for the photosynthetic capacity of plants and serves as an important indicator of vegetation growth status.Accurate measurement of chlorophyll content is essential for assessing plant health,optimizing fertilizer management,and evaluating crop yields.However,traditional measurement methods are time-consuming and labor-intensive.In recent years,hyperspectral remote sensing technology has been rapidly developing as a cutting-edge technology,and using hyperspectral data for estimating chlorophyll content has become an important approach.This paper provides a comprehensively review of the development of typical airborne star-borne hyperspectral imagers both domestically and internationally.By analyzing relevant literature,the paper analyzes the advantages and limitations of three methods,namely,spectral vegetation index construction,hyperspectral red-edge positional parameters and machine learning algorithms,in inverting chlorophyll from hyperspectral data,and points out the shortcomings of the current development of hyperspectral remote sensing and the research on quantitative inversion of vegetation chlorophyll,and proposes the future research direction. Table and Figures | Reference | Related Articles | Metrics

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Biodiversity Conservation and Practice in National Wetland Park—A Case Study of Xixi National Wetland Park HU Xinting, YUAN Jun, CHENG Yonqquan, GUO Fengyi, YUAN Weiying, LI Gang, YANG Yongfeng Forest and Grassland Resources Research    2024, 0 (2): 133-140.   DOI: 10.13466/j.cnki.lczyyj.2024.02.016 Abstract （774）   HTML （15）    PDF （1015KB）（1875）       Knowledge map    Save China established its first National Wetland Park in 2005.As an indispensable component of wetland protection system in China,national wetland parks have significantly contributed to biodiversity conservation over the past two decades.This study examines the significant challenges national wetland parks face in current biodiversity conservation and outlines key strategies for biodiversity conservation planning.Taking Xixi national wetland parks as a case study,it demonstrates specific practices in biodiversity conservation,particularly in rare and endangered species conservation,watershed biodiversity demonstration and nature education.This study proposes strategies for the key directions of biodiversity conservation in national wetland parks,which include protecting and restoring the biological baseline resources of wetlands,wild plant and animal habitat restoration,establishing information system for wetland sensing and monitoring,and promoting scientific and rational utilization of biological resources.These strategies aim to facilitate the development of national wetland park and enhance the quality of wetland biodiversity conservation in the new era. Table and Figures | Reference | Related Articles | Metrics

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Evaluation and Optimization of Survey Methods for Ecological Factors about Wild Animals and Their Habitats YANG Xiao, HU Jiping, REN Kailei, RUAN Xiangdong FOREST RESOURCES WANAGEMENT    2023, 0 (3): 65-70.   DOI: 10.13466/j.cnki.lyzygl.2023.03.009 Abstract （772）   HTML （23）    PDF （998KB）（773）       Knowledge map    Save The field survey of the current ecological situation is the basis for the prediction and evaluation of ecological environment.However,the current field investigation methods focus on assessing the status of the ecological environment,and cannot accurately predict the potential impact of construction projects during construction and operation.Under the new situation of comprehensively strengthening the protection of wild animals,the paper innovatively introduced the concept of "relative value" for six indicators which were wildlife activity degree,species richness,the quantity of key national protected wild animals,habitat connectivity,vegetation coverage and the quantity of key national protected wild plants.Combining qualitative and quantitative technical measures,the optimization of the content,methods and data calculation methods of ecological status investigation were discussed.The optimized investigation method not only lays a foundation for the objective prediction of the potential impacts of construction projects on wildlife and their habitats,but also provides effective technical support for the early project approval and decision making.It also is of great significance to study how to coordinate the development of infrastructure construction with the protection of ecological environment. Table and Figures | Reference | Related Articles | Metrics

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Soil Nutrient and C:N:P Stoichiometry of Different Aged Pinus armandii Plantations HE Bin, LI Qing, LI Wangjun, ZOU Shun, BAI Xiaolong, FENG Tu FOREST RESOURCES WANAGEMENT    2023, 0 (1): 71-79.   DOI: 10.13466/j.cnki.lyzygl.2023.01.009 Abstract （756）   HTML （20）    PDF （1538KB）（586）       Knowledge map    Save In order to elucidate the effects of stand age on soil nutrients and C:N:P stoichiometry characteristics in Pinus armandii plantations,an age sequence of Pinus armandii stands (10 years old,16 years old,22 years old and 47 years old) were selected in Wumeng Mountain,Bijie City,Guizhou Province.Three representative 20 m×20 m plots were set in each forest stand.The soil pH,total carbon (TC),total nitrogen (TN),total phosphorus (TP),total potassium (TP),total calcium (TCa),soil organic carbon (SOC),available nitrogen (AN),available phosphorus (AP),and available potassium (AK) at soil depth of 0-20 cm were measured,and the stoichiometric ratio of soil C:N:P was calculated.Their changes with stand age and their relationship between the C:N:P stoichiometric ratio and the factors were explored.The results showed that the concentrations of SOC and TN among different ages ranged 23.624~65.093 g/kg and 1.533~5.157 g/kg,respectively,which were much higher than the national average level.The concentrations of TP ranged 0.327~1.097 g/kg,which was comparable to the national average soil level.These indicated that the concentrations of SOC and TN were high in the study area.The stand age had significant effects on soil nutrients and C:N:P stoichiometric ratio.With the increase of stand age,the soil TC,SOC,C:N and C:P showed a trend of first decreasing and then increasing,whereas soil pH,TK and TCa showed a trend of first decreasing and then increasing.The TN,TP,AN,AP and AK increased gradually with the increasing of stand age,whereas the soil N:P showed a wavy trend.Pearson correlation analysis showed that the correlations of soil C:N and C:P with TK and TCa were greater than those with TN and TP,indicating that the soil C:N ratio and C:P ratio of Pinus armandii plantations were mainly affected by the contents of potassium and calcium.Therefore,it is particularly important to scientifically regulate the contents of potassium and calcium in the soil during the management of Pinus armandii plantations.Results from this study can provide theoretical basis for sustainable and scientific management of Pinus armandii plantations. Table and Figures | Reference | Related Articles | Metrics