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《Journal of Northwest A & F University(Natural Science Edition)》 2011-01
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Assessment of provincial-scale forest fragmentation in Chinese mainland

SUN Fei,CHEN Min-xue,MAO Li-jun,LI Ming-shi(College of Forest Resources and Environment,Nanjing Forestry University,Nanjing,Jiangsu 210037,China)  
【Objective】 This study was to assess forest fragmentation patterns at the provincial scale in Chinese mainland to separate anthropogenic disturbances from natural disturbances responsible for forest fragmentation,and to probe the socioeconomic drivers for forest fragmentation.【Method】 Roads were extracted from the 2006 Remotely Sensed Map for China and integrated into the latest global land cover database,Globcover v2.2,with a spatial resolution of 300 m.Then a forest fragmentation model was applied to the revised Globcover to classify each forest pixel into one of the six fragmentation components,including interior,perforated,edge,patch,transitional and undetermined at the analytical window of 3×3 pixels.Those areas having high amount of anthropogenic disturbances were located by interpreting anthropogenic disturbance values derived from the model.Ultimately,a suite of forest fragmentation maps with spatially explicit implications was produced to present the fragmentation patterns.Additionally,spatial association index was computed to characterize the spatial interactions between forest class and other target land use types of interest.【Result】 A low forest fragmentation intensity in Fujian,Inner Mongolia,Jiangxi,Zhejiang and Tibet followed by a high fragmentation in Hebei,Beijing,Shandong,Jiangsu and Shanghai,as well as Qinghai was observed.Furthermore,forests in Xinjiang,Inner Mongolia,Ningxia,Qinghai,Shandong and Jiangsu were heavily disturbed by far-reaching anthropogenic events at a high severity.Additionally,a high spatial interaction between forest and agricultural land use was identified in Jiangsu,Chongqing,Qinghai,Shandong and Shanghai,while forests in Heilongjiang,Jilin,Inner Mongolia,Liaoning were highly associated with natural land-use types.Contributions of urban land uses to forest fragmentation were observed at a low rate in contemporary China.【Conclusion】 Forest fragmentation in China is primarily attributed to the widespread anthropogenic disturbances,particularly,the expansion of agricultural land uses driven by a huge population.The spatially explicit forest fragmentation maps derived from implementing the fragmentation model are the information basis for governments and conservation communities to develop reasonable land use decisions and biodiversity conservation practices,and to formulate ecologically sustainable forest management strategies,implying that the fragmentation model has an incomparable strength compared to the conventional landscape indices when dealing with forest fragmentation issues.Meanwhile,we need to recognize that forest fragmentation is a long-term,complex social issue,which requires a comprehensive measure that is closely associated with political,economic and educational process to be taken to minimize the impacts of human events on the existing forests,to mitigate the potential threats of forest fragmentation to forest ecosystems to ensure the ecological security of nation.
【Fund】: 国家自然科学基金项目(30972297);; 教育部留学回国人员科研启动基金项目;; 江苏省2009年高等学校大学生实践创新训练计划项目;; 国家级林学实验中心和林业专业人才培养模式创新项目
【CateGory Index】: S718.5
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