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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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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 （3468）   HTML （140）    PDF （2114KB）（1082）       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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Inventory and Characteristic Analysis for Ancient and Famous Tree Resources in Mangshi,Yunnan Province ZHU Kun, DAI Jiping, PANG Jing, HAN Xu, ZUO Xiang, PENG Jiansong FOREST RESOURCES WANAGEMENT    2020, 0 (1): 22-29.   DOI: 10.13466/j.cnki.lyzygl.2020.01.004 Abstract （2044）   HTML （14）    PDF （1891KB）（866）       Knowledge map    Save Based on the investigation of the current situation of ancient and famous trees in Mangshi City,and the analysis of the resource characteristics,spatial distribution pattern and growth status of ancient and famous trees,the results show that there are 1028 ancient and famous trees in Mangshi area,belonging to 32 species,23 genera,17 families.Taking local tree species such as Ficus altissima as the main dominant species,the age of trees is pyramid structure,and the spatial distribution is a pattern of gathering in the central urban area and gradually radiating around.Human activities have little impact on ancient trees.There is a strong correlation(p=-0.959)between the altitude and the number of ancient trees.There is a nonlinear positive correlation among DBH(mainly Ficus altissima),crown diameter and tree height,and the increase of tree age will not affect the appearance and growth of tree species.The ancient and famous trees resources in the suburbs will become the focus of protection for the management departments in the future.The study comprehensively analyzed the status of ancient tree resources in the city from various perspectives,which can provide reference for the protection of ancient and famous trees. Table and Figures | 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 （2023）   HTML （59）    PDF （999KB）（922）       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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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 （2014）      PDF （1044KB）（2551）       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 （1994）   HTML （50）    PDF （1521KB）（2136）       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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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 （1882）   HTML （77）    PDF （1976KB）（2388）       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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Diversity of Butterfly Community in Fenglin National Nature Reserve YUAN Gaixia FOREST RESOURCES WANAGEMENT    2021, 0 (5): 87-96.   DOI: 10.13466/j.cnki.lyzygl.2021.05.012 Abstract （1689）   HTML （14）    PDF （1197KB）（2477）       Knowledge map    Save To explore butterfly community diversity in Fenglin National Nature Reserve,butterflies were investigated with the line transect method inside and outside the reserve from June to August each year from 2016 to 2018.A total of 15 083 butterflies were observed,of which 99 species in 60 genera under seven families were identified.Nymphalidae was the dominant family,with the most number of genera,species and individuals.There were 5 dominant species,19 common species,57 unusual species and 18 rare species.Nymphalidae had the highest diversity index and richness index,Papilionidae had the highest dominance index and Parnassiidae had the highest evenness index.There was a significant difference in diversity of butterflies among habitats,with the diversity index being the highest in medium altitude core area and the lowest in high altitude experimental area.The diversity index of butterflies had a significant positive correlation with their richness index in all habitats (r=0.9971,P<0.001).The dynamic trend of species number,the diversity index and the richness index was consistence,being the highest in July and the lower in June and August.The community similarity coefficient of species was 0.8 inside and outside the reserve,showing they were very similar.The community similarity coefficient of species among different habitats ranged from 0.55 to 0.81,high coefficient indicating slight difference of comprehensive environmental factors.In conclusion,Fenglin Nature Reserve had abundant butterfly resources,a healthy ecosystem,stable environment,and high protection value. 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 （1654）   HTML （114）    PDF （926KB）（977）       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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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 （1574）   HTML （32）    PDF （1804KB）（305）       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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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 （1573）   HTML （80）    PDF （1734KB）（1184）       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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Study on Urban Residents' Green Consumption Behaviors and Their Influencing Factors Xiaodi ZHAO, Jiayan FU, Xinsheng PANG FOREST RESOURCES WANAGEMENT    2020, 0 (1): 191-198.   DOI: 10.13466/j.cnki.lyzygl.2020.01.025 Abstract （1544）   HTML （36）    PDF （1290KB）（1527）       Knowledge map    Save Green consumption is of great value to green development.Richter Scale Method was adopted to investigate the green consumption of 1000 residents in representative cities of six major regions in north China,east China,central China,south China,northwest China and southwest China.Table data were obtained from four aspects of consumption behavior,consumer perception,external factors and other factors.On this basis,the structural equation model (SEM) was constructed,and the fitting was modified by the general least flat method (GLS) to explore the influence of consumption intention,environmental awareness and economic factors on residents' green consumption behavior.Research shows that individual responsibility,policy factors and product trust have positive effects on green purchasing attitude.Economic factors and product prices have negative effects on green purchasing behavior. Table and Figures | Reference | Related Articles | Metrics

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Research Progress in the Monitoring of Forest Diseases, Insect and Pests Based on Satellite Remote Sensing Images QI Xinglan, CAO Zuning, LIU Jian, CHEN Fang, ZHUANG Wei FOREST RESOURCES WANAGEMENT    2020, 0 (2): 181-186.   DOI: 10.13466/j.cnki.lyzygl.2020.02.027 Abstract （1501）   HTML （43）    PDF （1056KB）（866）       Knowledge map    Save Forest diseases,incect and pests are the main disasters of forests.Rapid and accurate monitoring of forest diseases,insect and pests is the key of pests and diseases control.Using satellite remote sensing image to monitor forest diseases,insect and pests is an economical and efficient means.To further strengthen the research and practice of remote sensing monitoring of forest diseases,insect and pests,the present situation of domestic and foreign research on the monitor of forest diseases,insect and pests with remote sensing images was comprehensively analyzed.On this basis,the main technical methods of monitoring forest diseases and insect pests by satellite remote sensing image are summarized systematically,and the main problems and research future are analyzed deeply.Research result shows the following three main problems existing in the studies of remote sensing monitoring forest diseases,insect and pests,including:(1) insufficient research on high spatial resolution image;(2) inadequate mining on image texture information;(3) challenge in remote sensing monitoring of leaf loss.This paper puts forward four countermeasures and suggestions in view of the above main problems,including:(1) comprehensive application of multi-source remote sensing data;(2) to enhance image processing technology;(3) to strengthen the use of pest habitat factors;(4)construction of remote sensing monitoring system platform for diseases and pests,etc. 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 （1431）   HTML （52）    PDF （1114KB）（1815）       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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Study on Phenotype and Adaptability Evaluation of Cold-Tolerant Fern in Beijing HE Guoxin FOREST RESOURCES WANAGEMENT    2022, 0 (2): 82-90.   DOI: 10.13466/j.cnki.lyzygl.2022.02.012 Abstract （1426）   HTML （4）    PDF （5738KB）（1456）       Knowledge map    Save The main problems existing in Beijing plain area are as follows:the landscape of uniform tree species is lack of vertical layer especially in ground cover plants,let alone pay attention to species diversity and density,as well as seasonal colors.There are few ground cover species in high canopy forests,and the phenomenon of understory blank is prominent.To enrich the diversity of ground cover plants under forests,10 cold resistant fern varieties were introduced to carry out adaptability research tests such as cold tolerance,negative tolerance and cold tolerance. Four varieties of fern,including Mexicans fern,Banas fern,Japanese color leaf fern and Ostrich fern,suitable for understory planting in Beijing Plain were selected.The evaluation indexes and methods of the adaptability of the introduction and cultivation of cold resistant fern were summarized. The screening and evaluation experiment of cold resistant fern enrich the species of ground cover plants,and provide more choices for high-quality landscape construction of the capital. Table and Figures | Reference | Related Articles | Metrics

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A Study on Integration and Optimization Rules and Paths for Natural Protected Areas in China TANG Xiaoping, LIU Zengli, MA Wei FOREST RESOURCES WANAGEMENT    2020, 0 (1): 1-10.   DOI: 10.13466/j.cnki.lyzygl.2020.01.001 Abstract （1415）   HTML （77）    PDF （1361KB）（1254）       Knowledge map    Save The integration and optimization for natural protected areas are important tasks for the construction of scientific and reasonable natural protected areas system and ecological civilization in the new era. According to ‘Guidelines on the establishment of a natural protected areas system dominated by national parks’,we determined the aims,objects,tasks and principles of integration and optimization for natural protected areas in China. At the same time,rules about system transformation,integration,optimization and division,as well as paths along planning,confirmation and practice had been refined for the integration and optimization of natural protected areas. In addition,we developed management styles by classification and division,and support systems of organization,team,capital and technology for natural protected areas after the integration and optimization. In conclusion,our study aimed to provide theoretical foundation and technical guidance for integration and optimization for natural protected areas,establish an integrated,standardized,and effective system with Chinese characteristics,so as to support and promote construction and management of natural protected areas. Table and Figures | Reference | Related Articles | Metrics

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Individual Tree Crown Width Extraction and DBH Estimation Model Based on UAV Remote Sensing ZHANG Yuwei, ZHANG Chao, WANG Juan, LI Huayu, BAI Mingxiong, YANG Anrong FOREST RESOURCES WANAGEMENT    2021, 0 (3): 67-75.   DOI: 10.13466/j.cnki.lyzygl.2021.03.011 Abstract （1328）   HTML （56）    PDF （3299KB）（983）       Knowledge map    Save Crown width and DBH are important tree measurement factors in forest resources survey.Automatic acquisition of crown width and DBH data can improve the efficiency of forest resources investigation.In this study,Pinus yunnanensis was selected as the research object.Based on UAV images,the parameters of individual tree crown width were extracted automatically,and the relationship between crown width,crown area and DBH of different density grade plots was fitted to predict the DBH value of trees.Firstly,the individual tree crown in the canopy height model (CHM) was segmented by marker controlled watershed segmentation algorithm,and the maximum and minimum crown width and crown area were obtained,and the accuracy was evaluated with the mea-sured data.Then,the extracted crown width and crown area were fitted with the measured DBH,and the univariate and binary regression models of each density grade plot were established.The results showed that:the accuracy rate of individual tree crown segmentation was 86.26%,the average relative error of crown width was 6.04%,and the average relative error of crown area was 11.23%;in the fitting model,the fitting effect of crown width & crown area DBH model was the best,the determination coefficient was above 0.7,the relative error of validation data of the model was less than 5%,which met the requirements of class A forest resources survey.The method of extracting crown width and predicting DBH of trees based on UAV image is more accurate,which can provide reference for automatic development of forest resources investigation. Table and Figures | Reference | Related Articles | Metrics

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Study on the Characteristics of Forest Fires in China and Their Relationship with Major Climatic Factors DU Jianhua, GONG Yinting, JIANG Liwei FOREST RESOURCES WANAGEMENT    2019, 0 (2): 7-14.   DOI: 10.13466/j.cnki.lyzygl.2019.02.002 Abstract （1327）   HTML （30）    PDF （1753KB）（952）       Knowledge map    Save Based on the fire data and CRU grid meteorological data,the time characteristics,Pearson correlation analysis and linear regression analysis are used to comprehensively analyze the time characteristics of the 1950-2017 forest fires and their climate driving factors.A fire casualty prediction model is established.The results showed that there was a significant positive correlation among the number of forest fires,the area of forest damage,injury,death and casualties,with similar changes or linear trends.Since 1950,the number of forest fires,forest area and casualties in the country have shown a significant downward trend;After 1988,the fires are relatively small,which may be related to the fire cycle,global climate change and the national fire prevention after the “5-6” devastating fire.Policy changes are closely related.The number of forest fires in China during the period from 1950 to 1987 was positively correlated with the precipitation in the growing season,and the precipitation in the non-growth season was negatively correlated.After 1988,except for the precipitation in May and September,the occurrence of forest fires was basically negatively correlated with the precipitation.The number of forest fires in the country between 1950 and 1987 was positively correlated with the temperature at the end of the growing season.After 1988,the number of forest fires was negatively correlated with the average temperature,high temperature and low temperature of the previous year and the growing season or growing season.The reduction in combustibles caused by the negative effects can be the reason for explaining the negative correlation between temperature and the number of forest fires.The number of forest fires in the country between 1950 and 1987 was positively correlated with PDSI in the previous year and reached significant levels in June,September,November and December.After 1988,the number of forest fires was negatively correlated with monthly PDSI.In the context of climate warming,the trade-off between the amount of combustibles and the moisture content is the key to the occurrence of a forest fire.The change in fire prevention policies and the “warm-dry” phenomenon triggered by high temperatures may change or challenge traditional fire-climate laws.With the duality of the impact of fires on the forest,while at the same time of fire prevention,we must increase the study of forest fires,and scientifically and rationally manage forest fires. 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 （1313）   HTML （39）    PDF （1165KB）（340）       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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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 （1309）   HTML （42）    PDF （9509KB）（467）       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