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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
    Abstract2015)   HTML183)    PDF (1091KB)(910)       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.

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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
    Abstract859)   HTML26)    PDF (1114KB)(905)       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.

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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
    Abstract267)   HTML7)    PDF (1271KB)(780)       Save

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

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    Practices and Exploration of Forest Ticket System Reform in Sanming of Fujian Province
    WANG Weibin, LI Shan
    FOREST RESOURCES WANAGEMENT    2021, 0 (4): 17-22.   DOI: 10.13466/j.cnki.lyzygl.2021.04.003
    Abstract668)   HTML11)    PDF (1144KB)(757)       Save

    The key approaches to turn lucid waters and lush mountains into invaluable assets are to focus on core problems such as difficulty in discovering the value of forestry basic assets,low pricing efficiency,and poor liquidity,through the establishment and improvement of market-oriented forest resource value discovery mechanisms,product pricing mechanisms,and circulation trading mechanisms to gradually promote the capitalization of ecological resources,the securitization of ecological assets,and the marketization of ecological securities trading.Since the 19th National Congress of the Communist Party of China,Sanming has been implemented the spirit of General Secretary Xi Jinping's instructions on comprehensive deepening reform,especially the forestry reform in Fujian,explored the market-oriented mechanism for value discovery and realization of ecological products based on the reform concept of "lucid waters and lush mountains are invaluable assets" and continued to deepen the fourth round of forest reform with forest ticket system innovation as a breakthrough.Taking Sanming as an example,this paper summarized the pilot situation and main experience of the current forest ticket system reform,analyzed the current problems and expected benefits in the exploration of the forest ticket system in Sanming,and provided opinions and implementation suggestions for continuing to deepen the reform of the forest ticket system.

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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
    Abstract872)   HTML52)    PDF (1734KB)(685)       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.

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    Grassland Vegetation Coverage Retrieval Based on Sentinel-2 Multi-Spectral Remote Sensing Data: A Case Study of Inner Mongolia Autonomous Region
    TIAN Haijing, WANG Lin, HAN Liliang, FAN Yunbao, YANG Jilin
    FOREST RESOURCES WANAGEMENT    2022, 0 (4): 134-140.   DOI: 10.13466/j.cnki.lyzygl.2022.04.017
    Abstract315)   HTML7)    PDF (4757KB)(644)       Save

    High-precision grassland vegetation coverage remote sensing estimation model is important for quantitative assessment of grassland quality and fine management of grassland.Based on Sentinel-2 multi-spectral remote sensing data and measured sample plots in Inner Mongolia autonomous Region,grassland vegetation coverage was modeled and inverted.The results showed that:1)There was a significant correlation between the 23 vegetation indexes and the measured vegetation coverage (P<0.001),and the highest correlation coefficient was NDVI with a correlation coefficient of 0.834;2)The underestimation of sinusoidal function was more obvious in the high value part (coverage>75%),while the overestimation of linear function was more obvious in the low value part (coverage<25%),by using these two kinds of functions to simulate vegetation coverage,the results were better;3)The grassland types were divided into 6 groups to modeling vegetation coverage respectively.Finally,correlation coefficient between simulated and measured vegetation coverage for the 1 894 sample plots was R2=0.722,P<0.01,RMSE=12%;4)The vegetation coverage of different grassland types in Inner Mongolia from high to low was 78.91% for mountain meadow,73.7% for temperate meadow steppe,53.89% for lowland meadow,52.57% for temperate steppe,32.76% for temperate desert steppe,25.52% for temperate grassland desert and 19.29% for temperate desert.

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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
    Abstract2499)   HTML115)    PDF (2114KB)(633)       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.

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    Comparison of Vegetation Classification Methods Based on High Resolution Remote Sensing Image
    ZHANG Diandai, WANG Xuemei
    FOREST RESOURCES WANAGEMENT    2021, 0 (3): 108-113.   DOI: 10.13466/j.cnki.lyzygl.2021.03.017
    Abstract442)   HTML9)    PDF (2282KB)(610)       Save

    Taking the oasis-desert transition zone in the eastern part of Kuqa City,Xinjiang as the research object and using GF2 remote sensing image as the main data source,on the basis of field investigation,supervised classification based on pixel and object oriented classification based on hierarchical multi-scale segmentation were used to accurately identify the vegetation information in the study area.The results showed that:1) The results of supervised classification and object-oriented classification were roughly the same.The overall classification accuracy rates of both methods could reach more than 94%,and the Kappa coefficient was greater than 0.93,both of which reflect higher classification accuracy.2)Compared with supervised classification,the object-oriented classification method improved the overall classification accuracy by 3.79%,and the Kappa coefficient increased by 0.032,which had a better classification effect and classification accuracy.By determining the optimal scale segmentation,the object-oriented classification method can more accurately extract vegetation information in the study area,and provide a scientific basis for the reasonable evaluation of the regional land desertification status.

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    Research on the Development Model of Holistic Tourism in Libo County of Guizhou Province Based on E-RMP Analysis
    MENG Gui, NING Youliang, WU Shuirong, LIU Yefei
    FOREST RESOURCES WANAGEMENT    2021, 0 (5): 139-145.   DOI: 10.13466/j.cnki.lyzygl.2021.05.018
    Abstract457)   HTML29)    PDF (1315KB)(607)       Save

    On the basis of reviewing the overall situation of holistic tourism development in Libo County of Guizhou Province,the development path and economic development model of holistic tourism resources in Libo County under the background of "Two Mountains Theory" were clearly defined,in order to provide development ideas for rural revitalization in economically underdeveloped areas with superior resource endowment.Based on the improved E-RMP analysis method,a logical analysis framework was developed to sort out the resource basis,tourist characteristics and product potential of tourism development in Libo County from the dimensions of ecological resources,market and product characteristics,and then analyze the development path and development mode of tourism resources in Libo County.The results showed that:Libo County adhered to the development principle of "ecological green county",through the effective protection of ecological resources,kept the "lucid waters and lush mountains",so that the level of urban greening and the quality of living environment constantly improved,and ecological benefits gradually appeared;Further through the rational use of ecological resources,the development of ecological tourism industry and the gradual expansion of green industry to enrich the people,Libo County built a "tourism county",promote the steady improvement of people's income and living standards,and gradually realized the "Lucid waters and lush mountains" to "invaluable assets" transformation;In order to promote the construction of "fertile tourism county" and expand "gold and silver mountains",Libo County should notice the implementation of high-quality tourism quality promotion strategy,facilitate the integration of "tourism+" industry and pay attention to space expansion.

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    Dynamic Change and Influencing Factors of Vegetation Cover over the Past 30 years in the Wutai Mountain Area
    REN Tianchen, CHEN Junfeng, LIU Nan
    FOREST RESOURCES WANAGEMENT    2022, 0 (4): 89-99.   DOI: 10.13466/j.cnki.lyzygl.2022.04.012
    Abstract480)   HTML11)    PDF (8599KB)(554)       Save

    Based on 25 Landsat remote sensing data sources from 1991 to 2020,the temporal and spatial characteristics of vegetation coverage and its influencing factors in Wutai Mountain were analyzed by binary pixel model,wavelet analysis and partial correlation analysis.The results showed that the FVC values in Wutai Mountain area showed an increasing trend on the whole,in which the mean value of FVC in Wutai County was the highest,and the FVC growth rate in Yuanping City was the highest.There were three main change cycles of 9,12,21 years to control the change of FVC in the whole time domain.The vegetation cover in the study area showed a spatial distribution pattern of "low in the west and high in the east",and the improved area of vegetation cover was much larger than the degraded area.The CV values of Wutai County showed a large negative deviation phenomenon when the altitude was lower than 2 400m,and a large positive deviation phenomenon when the altitude was higher than 2 400m.The FVC values of Fanshi County showed an order as follows:shade slope>sunny slope>half shade slope>half sunny slope;The peak values of FVC in each slope direction of Dai County and Yuanping City appeared in the altitude range of 1 600~2 000m.The negative deviation of CV values in Wutai County,Dai County and Yuanping City increased with the increase of slope.From 1980 to 2015,the mean value of partial correlation coefficient between FVC value and temperature was 0.14,and that between FVC value and precipitation was 0.05.In Wutai Mountain area,the area of forest land and construction land increased,while the area of cultivated land and grassland decreased to varying degrees from 1980 to 2015,and there were vegetation decline problems in human-active areas such as mining areas and scenic spots.

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    A New Concept “Tree Species Mingling” for Mixed Degree of Stands Based on Tree Species Spectrum
    ZHANG Ke, FENG Sisi, HUANG Lang, LI Jianjun
    FOREST RESOURCES WANAGEMENT    2021, 0 (4): 62-68.   DOI: 10.13466/j.cnki.lyzygl.2021.04.009
    Abstract515)   HTML9)    PDF (1124KB)(529)       Save

    Spatial segregation degree of tree species is an important content in the study of stand spatial structure,which is usually described by the mingling degree.The existing mingling degree indices only have the same species or different species results when describing the probability that the object tree and the nearest neighbor tree are different species,which cannot fully explain the mingling degree of tree species.Based on the traditional mingling degree and tree species pedigree relationship,the concept of tree species mingling degree was put forward in this paper.The traditional mingling degree and tree species mingling degree were compared and analyzed with 25 sample plots in 5 forest regions of Hunan Province,and the stand simulation and optimization were carried out by using tree species mingling degree.The results showed that there was a strong correlation between tree species mingling degree and traditional mingling degree,and tree species mingling can further refine the isolation degree of tree species in the structural unit,which can be used for the evaluation and optimization of stand spatial structure.

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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
    Abstract311)   HTML3)    PDF (1197KB)(493)       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.

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    Forest Resources Status and Management Strategy in Beijing Plain Area
    WEI Yankui
    FOREST RESOURCES WANAGEMENT    2022, 0 (2): 10-18.   DOI: 10.13466/j.cnki.lyzygl.2022.02.002
    Abstract471)   HTML9)    PDF (1069KB)(479)       Save

    The plain area of Beijing is the main carrying area of the core capital functions and the urban functions. The forest in the plain area plays an important role for the health of residents and the development of various undertakings in the capital. The development of forest resources in Beijing plain area experienced recovery period,wandering period,steady development period and rapid development period. The present situation of plain forest resources was analyzed from the aspects of forest area,stock,forest species,age group and tree species composition. The change trend of plain forest area,stock,forest coverage rate and tree species composition from 2009 to 2019 was analyzed. It was concluded that the ecological pattern of the plain was basically formed,the resource structure of "more forest belts,less forest patches" was changed,the uniformity of ecological spatial distribution was improved,and the richness of forest landscape was increased.The situation and requirements of forest management in plain area in the new era were analyzed from three aspects:requirements of new urban general regulations,citizens' demand for beautiful environment and high-quality development of landscape in the new era.Through analysis and discussion,countermeasures and suggestions were put forward for forest management in Beijing plain area.

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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
    Abstract948)   HTML197)    PDF (995KB)(476)       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.

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    Prediction of Potential Distribution and Climate Change of Rare Species Cephalotaxus oliveri
    LIU Zengli, HU Lile
    FOREST RESOURCES WANAGEMENT    2022, 0 (1): 35-42.   DOI: 10.13466/j.cnki.lyzygl.2022.01.005
    Abstract544)   HTML16)    PDF (2243KB)(472)       Save

    Cephalotaxus oliveri is an II-class national protection of wild plant and a tertiary relic species in China. Understanding its distribution range and its response to climatic factors is helpful to protect the species under climate change. In this study,geographical distribution records from literature and specimen was used to analyze the potential geographical distribution of C.oliveri in China through MaxEnt model. Moreover,based on CMIP6 date from Digital Terrain of China,C. oliveri potential distribution under four climate change scenarios in the following 80 yearswas predicted. The results showed that:1) precipitation in the driest month,slope and annual precipitation were the main climatic factors affecting the distribution of C.oliveri. 2)Under the current climate conditions,highly suitable habitat for C. oliveri accounted for 1.7% of the area of China,mainly concentrated in the southwest edge of the Sichuan Basin,Wuling Mountains - Shennongjia,Xuefeng Mountain,Nanling,Luoxiao Mountain,Dabie Mountain,mountains in Southern Anhui - Tianmu Mountain,Wuyi Mountain - mountains in Southern Zhejiang,Daiyun Mountain and Central Mountains in Taiwan. However,under current climatic conditions,the southwest population (located in Yunnan Province) was not in the range of highly suitable habitat,which may be related to the relatively few definite distribution points and microhabitat effects in the local.3)Overall,the response of C.oliveri distribution to future climate (warm and humid) would be insensitive. Under the four scenarios of climate change,the model predicted that the spatial distribution of highly suitable habitat of the species would not change significantly. The area of low,medium,highly suitable habitat and all degree of suitable habitat would generally increase. The most highly suitable habitat of the species would slightly change under future climate except the SSP245 scenario,which would decrease continually.

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    Development of Multivariate Mixed Models for Forest Volume and Biomass
    ZENG Weisheng
    FOREST RESOURCES WANAGEMENT    2021, 0 (6): 23-28.   DOI: 10.13466/j.cnki.lyzygl.2021.06.005
    Abstract670)   HTML25)    PDF (1261KB)(468)       Save

    Based on the data of 1400 sample plots from continuous forest inventory in Beijing,the multivariate regression models between forest volume,biomass and factors including dominant species,age group,mean diameter,stem number,and canopy closure were developed using the mixed model approach. The results showed that the determination coefficients (R2) of the multivariate mixed models for forest volume and biomass were more than 0.8,the mean prediction errors (MPEs) were less than 3%,and the mean percent standard errors (MPSEs) were less than 25%;and for the forest volume and biomass estimates of 10 forest types,the MPEs were less than 15%,and the MPSEs were less than 30%. It is totally feasible in practice to develop multivariate regression models between forest volume,biomass and quantitative,qualitative/indicative factors of forest stands;the data of sample plots in arboreal forest from 9th national forest inventory can be used to develop multivariate mixed forest volume and biomass models,which would provide important basis for realizing the decomposition of total provincial data to city,county and each sub-compartment on forest map.

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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
    Abstract224)   HTML14)    PDF (972KB)(457)       Save

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

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    The Analysis of Typical Forestry Financing Models in China and its Innovative Development
    LI Yaojun, WANG Ye, LIU Guobin, LIAO Ting, GUO Liqin, YAO Yanwu, CAO Jun
    FOREST RESOURCES WANAGEMENT    2021, 0 (4): 23-28.   DOI: 10.13466/j.cnki.lyzygl.2021.04.004
    Abstract502)   HTML12)    PDF (1492KB)(451)       Save

    Forestry plays an important role in ecological civilization development,the innovative development of financing model of forestry is the key point in the modernization of forestry in China.By ways of literature review,material collection and data analysis,this paper summarized the current situation and development trend of financing model of forestry in China from the aspects of traditional financing models(the state direct investment,bank loans and foreign investment) and the innovation of financing models(forestry property mortgage loan,PPP financing model and BOT model).In addition,this paper also raised some suggestions to the innovative and healthy development of financing model of forestry from the aspects of establishing and improving policy and regulatory,improvement of professional property evaluation system and the establishment of financial market of forestry.

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    Research on Larch Extraction in Saihanba Mechanical Forest Farm Based on Sentinel-2 Data
    LI Bin, LI Chonggui, LI Yu
    FOREST RESOURCES WANAGEMENT    2021, 0 (2): 117-123.   DOI: 10.13466/j.cnki.lyzygl.2021.02.016
    Abstract652)   HTML29)    PDF (4793KB)(449)       Save

    As larch is the major part for forest management,the rapid and accurate extraction of the distribution of the larch plantation is of great significance to the operation and management of the Saihanba forest farm,which is a large State-owned forest farm in China.Remote sensing image classification based on traditional stand-alone mode is time-consuming and inefficient,while with the advance of geographic information big data and cloud computing era,Google Earth Engine (GEE),the pioneer of geospatial analysis platform,brings new opportunities for remote sensing image classification.The research is based on the GEE platform and uses Sentinel-2 data to realize the image classification of main tree species of the Saihanba Mechanical Forest Farm.By preprocessing the Sentinel-2 image data of 309 sceneries of the Saihanba Mechanical Forest Farm in 2019,the ratio vegetation index,texture features and topographic features are calculated,and the selection is optimized to construct a multi-feature classification data set.Then,the study compares the classification accuracy under the minimum distance method,decision tree and random forest classifier to obtain the tree species classification map of the forest farm with the best classification accuracy.The results show that the GEE has significant advantages compared with the single-machine image classification mode; the classification accuracy under the minimum distance,decision tree and random forest classifier are 80%,83% and 92%,respectively.Random forest classifier is more suitable for complex remote sensing classification tasks.

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    The Research of Carbon Emission and Carbon Sequestration Potential of Forest Vegetation in China
    YIN Jingping, ZHANG Yuxing, FU Yao, WANG Xuejun
    FOREST RESOURCES WANAGEMENT    2021, 0 (3): 53-61.   DOI: 10.13466/j.cnki.lyzygl.2021.03.009
    Abstract705)   HTML34)    PDF (1078KB)(436)       Save

    Carbon emission is an inevitable outcome of the initial stage of economic development,especially the right of developing countries existence and development.The carbon emissions of China have been maintained at a low level for a long time and became the top of the world in 2005.However,per capita carbon emission was still only 46.28% of the United States in 2016.China's total CO2 emissions are expected to reach 17~19Gt per y by 2030.To achieve the goal of carbon neutrality in 2060,it's necessary to change the energy structure, improve emission reduction technology and make the energy structure more reasonable.Therefore,replacing coal with gas is one of the most effective ways of emission reduction currently.By 2060,the carbon sequestration capacity of forest vegetation will reach or exceed 759.14Mt per y and the CO2 absorption capacity will reach 2.783 5Gt per y.According to that,China's carbon intensity in 2060 must reduce 95.39% on the basis in 2017 and reach 640t per 100 million yuan.The carbon sequestration capacity of terrestrial vegetation (forest,grassland) will reach or exceed 1.380 3Gt per y and the CO2 absorption capacity will reach 5.069 3Gt per y.According to that,China's carbon intensity in 2060 must reduce 91.07% on the basis in 2017 and reach 1 152t per 100 million yuan.As a consequence,under the condition that China's carbon intensity is difficult to achieve zero emissions,forest vegetation plays a key role in achieving the goal of carbon neutrality to ensure and improve the carbon sequestration capacity.

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