Spatial Distribution Analysis of Vegetation Cover Fraction in Yiluo River Basin

摘要

Extraction of vegetation cover information has significance for watershed resource and environmental quality assessment,management and development,sustainable development.This paper extracts the vegetation fraction using the 2009 TM image data of Yiluo River Basin,based on dimidiate pixel model.And vegetation fraction is divided into five categories from low to high,in order to study the spatial variation of vegetation cover situation.The results show that the basin's vegetation cover is good overall,with an average 60%.High value region of vegetation cover is located in Luanchuan,and near Bear Ear Mountain,and the southern of Luonan County;low value region is located in Song County and the River part of Luoning County.The area of vegetation fraction greater than 80% accounts for 57% of the entire study area,mainly concentrated in the Luhun reservoir to Luoning County;and lower than 20% only accounts for less than 5%,and mainly along both sides of the rivers,Luonan County,Luoyang City.The results will provide the basis for regional development and controlling.