RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2008, Vol. 17 >> Issue (6): 866-866.

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SEASONAL VARIATION OF EVERGREEN LAND COVERAGEIN POYANG LAKE WATERSHED USING MULTITEMPORAL SPOT4VEGETATION DATA

WANG Quanfang1,2, LI Jiayong2   

  • Received:1900-01-01 Revised:1900-01-01 Online:2008-11-20

Abstract:

Evergreen land coverage is the typical type of landscape in Poyang Lake watershed,accounting for 4005% of whole landscape.It includes three main types,i.e.evergreen broadleaf forest,evergreen needleleaf forest and evergreen mixed forest.By using multitemporal SPOT4VEGETATION sensor data,this paper analyzed the characteristic values of the evergreen land coverage,such as greenness value,crest value,trough value,integral of NDVI (NDVII),difference between the maximum and minimum NDVI (NDVIMM),etc.Both NDVII and minimum NDVI vary as “evergreen broadleaf forest>needle and broadleaved mixed evergreen forest>evergreen needleleaf forest>needleleaf and deciduous mixed evergreen forest”.The annual NDVI curve in typical evergreen broadleaf forest had no obvious change,while needleleaf and deciduous mixed evergreen forest had a single peak.

Key words: NDVI, seasonal variability, evergreen land cover, Poyang Lake watershed

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