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南方集体林区森林破碎化模式及趋势遥感刻画 ——以浙江余杭为例(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2010年04期
Page:
135-139
Column:
3S技术研究专栏
publishdate:
2010-08-06

Article Info:/Info

Title:
Remote sensing based characterization of fragmentation patterns and trends of the collective forests in southern China —A case study from Yuhang city of Zhejiang province
Author(s):
LI Mingshi1 XU Yifan12 LI Yunmei2 XU Da3 WEN Weisong3 LIU Anxing3
1.College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China; 2.The Key Laboratory of Virtual Geographic Environments Sponsored by Ministry of Education, Nanjing Normal University, Nanjing 210046, China; 3.Zhejiang Provincial Monitoring Center for Forest Resources, Hangzhou 310020, China
Keywords:
collective forests forest fragmentation fragmentation model landsat thematic mapper Yuhang city of Zhejiang province
Classification number :
S757
DOI:
10.3969/j.jssn.1000-2006.2010.04.029
Document Code:
A
Abstract:
Quantitative and spatially explicit forest change and fragmentation information is critical for addressing many pressing issues,including global climate change, carbon budgets, and sustainability. In this study, multitemporal TM images in 1984, 1994 and 2005 were used to classify 105 spectral classes respectively by implementing the unsupervised ISODATA algorithm. and the spectral classifications were conversed into the actual land cover classes involving forest, nonforest and missing value based on the local reference data including China’s land use for 1980’s and 1995, as well as the Globcover data for 2004—2006 and forest inventory data for 2005 in this analysis. Built on the aggregated patterns of forest versus nonforest, a forest fragmentation model was employed to extract the forest fragmentation status and trends over this collective forest area. Analysis results showed that forest area increased in the period from1984 to 1994 but it gradually reduced from 1995 to 2005. An accelerated forest fragmentation was observed in the whole study period, which was evidenced by a gradual decreasing share of interior forest accompanied by an increasing trend for perforated forest, patch forest and transitional forest, while with a relative stable status for edge forest and undetermined forest. The findings has implied that the unreasonable anthropogenic disturbances should be prohibited to impose on the existing forests over this region and an informative regulation plan sponsored by the local administrative agencies should be implemented when pursuing a philosophy of sustainable forest management to mitigate even eliminate the potential threats to forest ecosystems and biodiversity.

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Last Update: 2010-08-06