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Difference Analysis and Integration between Forest Resources Management "One Map" and the Third National Land Survey CHENG Weiya, ZHANG Zhuoman, WANG Han, JIANG Haiming, JI Min, LI Yinlong FOREST RESOURCES WANAGEMENT    2021, 0 (6): 6-11.   DOI: 10.13466/j.cnki.lyzygl.2021.06.002 Abstract （2525）   HTML （115）    PDF （2114KB）（642）       Knowledge map    Save Realizing the substantive integration of basic investigation and special investigation is an important content of natural resources investigation.In order to solve the problems of inconsistent concepts,overlapping contents and contradictory indicators of forest land survey data among different departments,this paper took Huangdao District of Qingdao Citys an example,integrated the "one map" of forest resources management and the data of the third national land survey,and deeply analyzed the differences between them from the perspectives of achievement data,survey boundary,classification standard and survey content.Based on the causes of differences,this paper put forward corresponding solutions and discussed the final data fusion technology,so as to provide effective references for the unified investigation of natural resources. Table and Figures | Reference | Related Articles | Metrics

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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 （2047）   HTML （185）    PDF （1091KB）（933）       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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Research on the Planning of Amur Tiger and Amur Leopard National Park LIANG Bingkuan, LIU Yang, TANG Xiaoping, BAN Yong, JIANG Yafang, KONG Ying, LI Bingbing, BAI Ling FOREST RESOURCES WANAGEMENT    2020, 0 (6): 23-30.   DOI: 10.13466/j.cnki.lyzygl.2020.06.005 Abstract （1346）   HTML （51）    PDF （1976KB）（1098）       Knowledge map    Save The establishment of Amur Tiger and Amur Leopard National Park is a major measure to protect the rare and endangered species,such as Amur tiger and Amur leopard,and their habitats.It is of global significance to protect the ecological security barrier as well.The national park is facing a key window period for the restoration of populations of Amur tiger and Amur leopard,also the reform period of the national forest area and the historical transformation period of the natural protected area system.The situation is complicated and changeable.The planning,at first,puts forward the philosophy of construction and development of adhering to natural priority,national interest,community benefit and common people sharing.Secondly,the planning clarifies,in the initial stage,the main management objective is to make the populations of Amur Tiger and Amur Leopard stabilized and reproduced,to restore and maintain the integrity of the forest ecosystem,and to promote the formation of both production and living modes with eco-friendliness in a community.And then,the planning adopts methods such as system planning,adaptability planning and LAC framework model to propose the solutions for key issues of national park such as boundary and range,control zoning,management system,ecological restoration and community development. Table and Figures | Reference | Related Articles | Metrics

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Comparison of Three Calculating Methods of Stand Volumes and Species Composition CHENG Ruichun FOREST RESOURCES WANAGEMENT    2014, 0 (3): 163-166.   DOI: 10.13466/j.cnki.lyzygl.2014.03.034 Abstract （1340）      PDF （1044KB）（558）       Knowledge map    Save Based on the survey data of permanent sample plots at Wangyedian Forest Farm in Chifeng,the results of the stand volumes and species compositions were compared,which were calculated with three methods including the average experimental form factor(AEFF)Formula method,the AEFF and Mean Tree method,and One-Way Volume Table method,and linear relationships were found among the three different stand volume figures.In mixed stands,the inconsistent results of species composition were not significantly different at the 0.05 level with the sign test based on the classifications according to the coefficient difference of the dominant tree species(if they were the same,species less than 5% used).So,the average experimental form factors could be used to measure stand volume and species composition.To forest farmers or family forest farms,the AEFF Formula method might be more useful than the others. Reference | Related Articles | Metrics

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Analyses on Arbor Tree Species Distribution Pattern and Stand Spatial Structure Heng WU, Liyan ZHU, Hailiang WANG, Zhijun LIU FOREST RESOURCES WANAGEMENT    2020, 0 (1): 54-61.   DOI: 10.13466/j.cnki.lyzygl.2020.01.008 Abstract （1338）   HTML （33）    PDF （1521KB）（534）       Knowledge map    Save Trees are an important factor in the stablity of forest ecosystem.The analysis of stand structure is of great significance to the stability protection and sustainable management of forest ecosystem.In this paper,the ninth national forest resources inventory data and special survey data of vegetation quadrat were used for cluster analysis to calculate tree species distribution pattern index and stand structure characteristic index,and the Gaussian distribution was used to fit the probability distribution of structure characteristic index,so as to provide a reference for forest ecosystem protection and management.The results show that the distribution of main tree species is clustered.The dispersion degree of arbor forest mixture index Mci is greater than that of tree species spatial structure TSS index. TSS index distribution shows the left truncated normal distribution,and the Mci index distribution shows the inverted "J" distribution.The fluctuation and continuous stability of the index may be related to artificial afforestation and natural forest protection. Table and Figures | Reference | Related Articles | Metrics

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Short Term Effects of Compound and Phosphate Fertilizer on the Growth of Juvenile Pinus Yunnanensis Plantation FU Zhigao, LI Lianfang FOREST RESOURCES WANAGEMENT    2021, 0 (1): 189-196.   DOI: 10.13466/j.cnki.lyzygl.2021.01.024 Abstract （1214）   HTML （18）    PDF （1804KB）（147）       Knowledge map    Save In order to understand the short-term(one year after fertilization) growth effects of compound fertilizer(including slow- release fertilizer,SRF) and phosphate(P) fertilizer on a 12-year-old Pinus yunnanensis plantation,the L9(3 4) orthogonal design was employed to implement the trial.At one year after fertilization,the growth rates of diameters at breast height(DBHs),tree height(THs) and individual tree volumes(ITVs) of treatment combinations(TCs) were 4.29%~12.37%,7.96%~22.58% and 20.13%~38.39%,while numbers of control were 3.80%,10.21% and 15.76%,respectively,which was of significant difference between the TCs(P<0.01).The dominant factor affecting growth rate of the DBH was the type of fertilizer,while which of the TH and ITV was the amount of the P fertilizer.The growth rates of the THs went up with the increase of P fertilizer application,while DBH was opposite.The interaction of fertilizer types and P fertilizer amount had significant difference effects on the DBH and TH growth rates(P<0.01 or P<0.05).The demand of nutrient types and quantity for the DBH and TH growth of juvenile P.yunnanensis was different,and the fertilization of the forest primarily focuses on promoting the DBH growth.Suitable types of compound fertilizer and P fertilizer amount could significantly improve the growth of trees.Accurate fertilization could be achieved by taking every 5cm diameter of the DBH as the calculation unit of fertilization.The combination of the 0.75 and 0.50 kg/5 cm of 9-month SRF and diammonium phosphate could promote the growth of juvenile P.yunnanensis plantation and increase the stand volume in a short period of one year after fertilization based on comprehensive results of the optimal combination of theory and practice,the interaction results of compound fertilizer types and P fertilization amount,and the dominant factors affecting the timber volume of the stand. Table and Figures | Reference | Related Articles | Metrics

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A New Mode for Forest Resource Monitoring in the Era of Big Data HUANG Guosheng, LIU Qian, PU Ying, SUN Xiangnan FOREST RESOURCES WANAGEMENT    2020, 0 (6): 1-5.   DOI: 10.13466/j.cnki.lyzygl.2020.06.001 Abstract （1200）   HTML （102）    PDF （926KB）（653）       Knowledge map    Save Over the past six decades of exploration and development,China’s forest resources monitoring has made great progress.With the in-depth advancement of ecological civilization construction and forestry reform development,higher requirements have been placed on the timeliness,synergy,up-to-dateness of monitoring data and capabilities of information service.In the era of Big Data,a highly flexible “mosaic” concept is applied to build a new “mosaic” mode for forest resource monitoring.The original “sliced” patch data can be deeply integrated and shared in real time on the Internet,which significantly improves forest resources monitoring capabilities and information service.Constructed in accordance with the Big Data thinking,the National Forest Resources Smart Management Platform has the basic prototype of the Big Data Cloud Platform with forest resources monitoring “mosaic” mode.To adapt to the new requirements of ecological civilization and modernization of forestry,the platform should be extended and applied to various types of professional investigation and business applications,gradually establish a new mechanism,based on Big Data,for process monitoring and smart services of Internet plus data collection and business applications.Through data fusion,business digitization,data mining,and service collaboration technology innovation,the new mechanism will effectively enhance forest resources monitoring capabilities,improve the information service level and make new contributions to the high-quality development of forestry and grass industry. Reference | Related Articles | Metrics

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Research on the Construction of Comprehensive Evaluation Index System of Natural Resources ZUO Song, HU Li, YANG Lina FOREST RESOURCES WANAGEMENT    2022, 0 (3): 12-18.   DOI: 10.13466/j.cnki.lyzygl.2022.03.002 Abstract （1031）   HTML （33）    PDF （999KB）（313）       Knowledge map    Save By collecting and sorting out relevant indicator systems and methods in the field of comprehensive evaluation of natural resources in China,some existing problems in the current evaluation system were summarized.On the basis of analyzing the key issues of natural resources management,combining with the relevant norms and standards published by the natural resources,forest and grassland,water conservancy,ecological environment and other departments,the comprehensive evaluation indicator system of natural resources with 12 second-level indicators and 41 third-level indicators was constructed from five dimensions of natural resources: background status of natural resources,efficient use of natural resources,green protection of natural resources,quality life of natural resources and governance status of natural resources,which will be expected to act as a reference for making a developed top-level design of natural resource evaluation,and constructing regional classification,multi-dimensional and multi-indicator of comprehensive evaluation indicator system. Table and Figures | Reference | Related Articles | Metrics

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The Simulation of Stand Distance Structure of Haloxylon ammodendron on the Southern Edge of Gurbantunggut Desert,Northwest China WANG Shaohua, HUANG Bingzhi, NIU Panxin FOREST RESOURCES WANAGEMENT    2020, 0 (4): 50-57.   DOI: 10.13466/j.cnki.lyzygl.2020.04.008 Abstract （981）   HTML （20）    PDF （11863KB）（114）       Knowledge map    Save This study takes the distance structure of the natural Haloxylon ammodendron stand as the research object.Through the construction of the nearest neighbor distance probability distribution model of the Haloxylon ammodendron stand,an estimated distance model independent of the tree species will be established,which will support the analysis of the spatial structure of different tree species in the forestry investigations.In this study,we use Matlab to generate three simulated plots of uniform,random and mass distribution types,and fit the nearest neighbor distance distribution model for the target points in the simulated plots and the stands of the measured plots.Through the Kolmogorov-Smirnov(K-S) test of the model fitting parameters,the results show that the simulation sample is simulated.The nearest neighbor distribution of ground and measured plots can be fitted with the Weibull distribution(Weibull-2) model with sound fitting eflects,in which the R2 value of simulated and measured plots is between 0.8832 to 0.9966 and the mean square root error(RMSE) is between 0.0034 to 0.0516 and 0.0066 to 0.0414.The value of D is less than the D0.05 value as the result meets the original hypothesis.Therefore,the Weibull-2 distribution model can be used to describe the distribution of the distance structure of the natural Haloxylon ammodendron,which shows good adaptability.It shows that the Weibull-2 distribution model can be used to describe the spatial structure of the stand of different tree species. Table and Figures | Reference | Related Articles | Metrics

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Study on the Current Situation and Modernization of State-Owned Forest Farms in Guizhou Province WEN Yu FOREST RESOURCES WANAGEMENT    2022, 0 (3): 36-41.   DOI: 10.13466/j.cnki.lyzygl.2022.03.006 Abstract （956）   HTML （197）    PDF （995KB）（476）       Knowledge map    Save This paper expounded the present situation and modernization construction mode of state-owned forest farms in Guizhou Province,analyzed the problems and shortcomings faced by the development of state-owned forest farms,and put forward the ways and measures to solve these problems,in order to provide reference for promoting the modernization construction of state-owned forest farms in Guizhou Province and realizing high-quality sustainable development. Reference | Related Articles | Metrics

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Discussion on Operation and Development of State-owned Forest Farms in Western Region of Inner Mongolia QIN Jiawei, YU Baole FOREST RESOURCES WANAGEMENT    2021, 0 (1): 17-22.   DOI: 10.13466/j.cnki.lyzygl.2021.01.003 Abstract （938）   HTML （41）    PDF （1503KB）（453）       Knowledge map    Save State-owned forest farms,which are an important component and supportof the ecological security in China,play a key role in forestry ecology construction in Inner Mongolia.State-owned forest farms are also of the significance in implementing the construction of ecological civilization and practicing the idea that lucid waters and lush mountains are invaluable assets.Based on the thorough understanding of the operation of state-owned forest farms in six cities in the western region of Inner Mongolia,this paper summarizes the characteristics of state-owned forest farms,analyzes major difficulties faced by state-owned forest farms,discusses ways of solution and puts forward reasonable suggestions for the future development of state-owned forest farms. Reference | Related Articles | Metrics

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Comprehensive Experiment Substitute for Multi-Payload Data of Terrestrial Ecosystem Carbon Inventory Satellite in Hainan LIU Yingchun, WU Fayun, SUN Zhongqiu, FU Anmin, GAO Jinping, GAO Xianlian, GAO Jianxin, CUI Chenyan, CHAO Zhi FOREST RESOURCES WANAGEMENT    2021, 0 (4): 138-148.   DOI: 10.13466/j.cnki.lyzygl.2021.04.018 Abstract （917）   HTML （30）    PDF （9509KB）（400）       Knowledge map    Save Hainan conserves one of the last tropical rainforests in China. The space-air-ground comprehensive data in tropical forest is not only the basis of the management of National Park of Hainan Tropical Rainforest,but also an important component to set up methodology of Terrestrial Ecosystem Carbon Inventory Satellite (TECISat) in China. From March 20,2020 to July 10,2021,we used National Forest and Grassland Inventory (NFGI) airborne platform to produce 20TB raw data and products that covered an area more than 6000 km2,including airborne large-footprint LiDAR,small-footprint LiDAR,visible and near-infrared image,and ultra-spectrum image. We also collected data from 170 forest plots,183 ground control points and 17 checking polygons. Combined with GF-7 and GEDI data,these data constituted the space-air-ground data covering National Park of Hainan Tropical Rainforest and surrounding area. The products showed that the horizontal and elevation accuracy of large-footprint LiDAR were better than 1m and 0.15m respectively. The horizontal and elevation accuracy of small-footprint LiDAR were better than 0.5m and 0.08m respectively. The elevation accuracy of DEM and height precision of CHM were 0.15m and 91.8% respectively. The horizontal accuracy of 0.2m DOM was better than 0.5m. The spectral and spatial resolution of ultra-spectrum image were 0.24nm and 1~2m respectively. This experiment provided high quality products and space-air-ground data for TECISat and national park management. Table and Figures | Reference | Related Articles | Metrics

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Calibration and Validation of National Forest and Grassland Inventory Airborne Large-Footprint LiDAR LIU Yingchun, GAO Xianlian, HE Yan, CUI Chenyan, GAO Jianxin, YU Jiayong, CAI Longtao, WU Fayun FOREST RESOURCES WANAGEMENT    2021, 0 (2): 52-60.   DOI: 10.13466/j.cnki.lyzygl.2021.02.008 Abstract （907）   HTML （31）    PDF （2739KB）（371）       Knowledge map    Save Forests play an important role in global terrestrial ecosystems.Precisely assessing forest resources and carbon sink with sample survey at a large scale is important before LiDAR is commonly used.To acquire precise geolocation of LiDAR footprint is an important step before it is applied in forest resource investigation because of the high special heterogeneity of forest height.In this paper,we use newly developed National Forest and Grassland Inventory Large-footprint LiDAR (NFGI-LIDAR-L)and ground Laser detector,develope a large-footprint LiDAR calibration method,improve the method of calculating the geocentric based on spatial pattern of laser from ground Laser detector,and calibrate NFGI-LIDAR-L.The results show that the method based on energy density of LiDAR improve the accuracy of calculating center location of large-footprint LiDAR from 5m to 1m.After calibration,the x,y,z and total accuracies of NFGI-LIDAR-L are improved from 60.51,52.76,1.88m and 80.30m to 0.61,0.54,0.05m and 0.82m,respectively.The absolute elevation accuracy of NFGI-LIDAR-L is 0.12m with flat surfaces validate with Ground Control Points.Therefore,the calibration method can be used in both calibration of airborne and spaceborne large-footprint LiDAR. Table and Figures | Reference | Related Articles | Metrics

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Biomass Carbon Stocks and Carbon Stock Economic Value of Forests in Beijing ZHANG Feng, PENG Zuodeng FOREST RESOURCES WANAGEMENT    2021, 0 (6): 52-58.   DOI: 10.13466/j.cnki.lyzygl.2021.06.009 Abstract （881）   HTML （53）    PDF （1734KB）（689）       Knowledge map    Save Based on the forest inventory data of Beijing from the seventh (2004-2008),the eighth (2009-2013) and the ninth (2014-2018),the continuous biomass expansion factor method was used to evaluate the dynamic changes of forest carbon stocks in Beijing during 2004-2018,and the carbon tax assessment method was used to estimate the economic value of the forest carbon sink in Beijing from 2004 to 2018. The results showed that: the forest carbon storage in Beijing was 7.09Tg from 2004 to 2008,9.43Tg from 2009 to 2013,and 15.39Tg from 2014 to 2018. The forest carbon density was 19.94,21.97,and 24.75t/hm2,respectively. The young forest accounted for the highest proportion of total carbon storage,accounting for 52.04%,47.64% and 53.42% in the three inventory periods respectively,while middle forest accounted for 23.05%,24.78% and 21.00% in the same period respectively. The economic value of forest biomass carbon sink in Beijing was 5.075 billion yuan between 2004 to 2008,5.725 billion yuan between 2009 to 2013,and 7.652 billion yuan between 2014 to 2018,the annual increment of economic value of forest biomass carbon sink in 15 years was 171.8 million yuan. The carbon stocks and carbon stock economic value of the forest resources in Beijing showed an increasing trend,but the proportion of young forest and middle forest was relatively high,and the carbon density of forests was low,so the scientific cultivation and management of the forest should be strengthened in order to continuously improve the function and value of the forest carbon sink. Table and Figures | Reference | Related Articles | Metrics

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Construction and Practices of Forest Land Gradation and Classification—A Case Study of Forest Land in Hainan Province SHI Tian, WU Jianwei, LI Xiaoxia, WU Bangao, ZHANG Hongwei FOREST RESOURCES WANAGEMENT    2022, 0 (6): 19-25.   DOI: 10.13466/j.cnki.lyzygl.2022.06.004 Abstract （873）   HTML （29）    PDF （1165KB）（139）       Knowledge map    Save This paper took the forest land resources in Hainan Province as an example to carry out the practical research work based on the General Rules for Gradation and Classification of Natural Resources for the first time.This paper had created a classification index interpretation model that could not directly obtain data,which constructed an evaluation scheme for the classification of forest land in Hainan Province by the method of factor and correction,and clearly adopted the five grade and five class evaluation system.The results indicated that 18.2474 million hm2 of forest land was the phased achievement of the "The Third Land Survey" project in Hainan Province and there were 2.1252 million basic units for forest land classification and grading,with one grade of each plot.There were actually four grades from 1 to 4;The commercial forest land was 7.8809 million hm2,and there were actually five grades from 1-5;The forest land of public welfare forest was 10.3665 million hm2,and there were actually 1-5 levels.The evaluation results reflected the actual situation of forest land in Hainan,and provided a reference for the standardization and procedure of national forest land classification with the promotion of forest land resources protection and rational development and utilization. Table and Figures | Reference | Related Articles | Metrics

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Concession Management Analysis and Operation Model Selection of China's National Parks GENG Songtao, ZHANG Hongxia, YAN Rong FOREST RESOURCES WANAGEMENT    2021, 0 (5): 10-19.   DOI: 10.13466/j.cnki.lyzygl.2021.05.002 Abstract （871）   HTML （26）    PDF （1114KB）（941）       Knowledge map    Save National park is one of the core tasks of China's protected area system construction.In order to achieve the win-win goal of national park ecological protection and resource appreciation,franchising is a good method that can be used in its operation and management.According to the classification,the national park franchise in our country belongs to the government concession.In order to regulate the concession management,this article used a comparative analysis method to analyze the O&M model (Operation and Maintenance Contract),the LOT model (Lease-Operate-Transfer),and BOT (Build-Operate-Transfer)mode and TOT (Transfer-Operate-Transfer)concession model are compared and analyzed,and it was concluded that the TOT model is currently the better choice for national park concession in China,and other models can also be used in conjunction with local conditions.In addition,in view of the existing problems in legal regulation,operation management,fund revenue and expenditure,and supervision of current characteristics of operation,four special measures such as improving the legal system,standardizing operation procedures,formulating revenue and expenditure standards,and improving the supervision mechanism were proposed to effectively contribute to China's ecological civilization.This article studied and explored the future development path of concession in national park management,so as to provide reference and inspiration for promoting the development of national parks. Table and Figures | Reference | Related Articles | Metrics

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Practice and Enlightenment of the Central and Local Cooperation to Build National Reserve Forest Project—Take the Chongqing National Reserve Forest Project as an example LUO Lian FOREST RESOURCES WANAGEMENT    2021, 0 (1): 11-16.   DOI: 10.13466/j.cnki.lyzygl.2021.01.002 Abstract （841）   HTML （50）    PDF （1545KB）（679）       Knowledge map    Save The implementation of the national reserve forest project is a vivid practice of the concept that lucid waters and lush mountains are invaluable assets.It is an important way to maintain national ecological security and a vital opportunity for the forestry industry to go through transformation and upgrading to high-quality development.The construction of the national reserve forest requires a large amount of funds,but the traditional financial investment is far from meeting the demand.The government is expected to encourage market entities to use development and policy capital to build the national reserve forest.This paper tries to analyze the the central and local cooperation in building national reserve forests in recent years,and based on the research on the innovation mechanism of the national reserve forest project in Chongqing,policy suggestions focusing on public welfare,people's livelihood and innovation are proposed to improve relevant industry policies. Reference | Related Articles | Metrics

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Study on Standards for Establishing National Parks in China TANG Xiaoping, JIANG Yafang, ZHAO Zhicong, LIANG Bingkuan, MA Wei FOREST RESOURCES WANAGEMENT    2020, 0 (2): 1-8.   DOI: 10.13466/j.cnki.lyzygl.2020.02.001 Abstract （837）   HTML （85）    PDF （1097KB）（357）       Knowledge map    Save On the basis of combing and referring to the establishment conditions and selection indexes of major national parks in the world,according to the new requirements of establishing a natural reserve system with national parks as the main body and starting from China's national conditions,this paper not only combines pilot practice of national park system but also puts forward the principles,establishment conditions and identification index system for selecting national parks in China.From the three aspects of national representativeness,ecological importance and management feasibility,10 evaluation indexes for the establishing China's national parks are determined.This paper also discusses the connotation of the concepts of national significance,public benefits,ecological character,integrity and authenticity.Analyzing the feasibility of taking all natural resources assets as main body of national parks,to ensure the three China national park concepts — ecological protection priority,national representative and public welfare could be realized during the practice and build the foundation for the establishment of national park system with Chinese characteristics. Table and Figures | Reference | Related Articles | Metrics

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Study on Vegetation Extraction Method in Karst Areas Based on Visible Light Band of Sentinel 2 DUAN Jiwei, ZHONG Jiusheng, JIANG Li, DAI Renli, HE Zhiyuan, LIN Shuangshuang, HE Xin FOREST RESOURCES WANAGEMENT    2020, 0 (6): 143-152.   DOI: 10.13466/j.cnki.lyzygl.2020.06.023 Abstract （834）   HTML （34）    PDF （8537KB）（211）       Knowledge map    Save In order to accurately extract vegetation information from visible band,study the characteristics of Karst vegetation in the visible light range and use the visible light band of the Sentinel 2 image,the spatial characteristics of the three bands of red,green and blue are created.The results showed that the spatial ratio characteristics of vegetation spectrum in blue-green are separable from other ground features and the brightness value of the vegetation is relatively low in the three visible lights.Comparing the extracted vegetation results with the normalized difference vegetation index,over-green index,ultra-green and ultra-red difference index,vegetation index,visible light band difference index,normalized green-red difference index,and normalized green-blue difference index,the study finds its precision is 92.67%,which is superior to other visible light extraction methods.It shows that the method is effective for the extraction of vegetation in Karst areas in the visible light band. Table and Figures | Reference | Related Articles | Metrics

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Research on Classified Evaluation of Forest Resources and Their Benchmark Price —A Case Study in Longquan,Zhejiang Province PENG Housheng, LI Chenchen, SHI Qiaoyu FOREST RESOURCES WANAGEMENT    2020, 0 (6): 61-65.   DOI: 10.13466/j.cnki.lyzygl.2020.06.010 Abstract （802）   HTML （24）    PDF （1397KB）（145）       Knowledge map    Save Based on the survey data of 2016 forest resource planning and design in Longquan,Zhejiang Province,this paper conducts classified evaluation of forest resources and studies the benchmark prices,which are then used to calculate the forest resource assets in Longquan.The results show that 1) except for the young forest,the benchmark prices of the timber stands in the middle age forest,near mature forest,mature forest and over mature forest all show an upward trend with the increase of stock volume.2) The benchmark price of the economic forest is the highest in the early production period,followed by the peak production period,then the pre-production period,while the price in the declining period is zero.3)By calculating the forest resource assets in Longquan with the benchmark price,the resarch shows that the total stand values of different tree species are in order from high to low:the Cunninghamia lanceolata is 5.455 billion yuan,the hardwood forest is 2.411 billion yuan,the economic forest is 2.028 billion yuan,and the Masson pine is 0.478 billion yuan.The research results of the benchmark prices are applied to the forest resource asset value accounting.With the simple operation and good effect,they can provide technical support for compiling the balance sheet of natural resources and the audit of natural resource assets of leading cadres. Table and Figures | Reference | Related Articles | Metrics