关键词: 乌拉特后旗, 植被覆盖度, 时空变化

Abstract:

This paper adopted the remote sensing images from 2006,2010 and 2015 respectively.In addition,the result of the annual vegetation coverage in Wulatehouqi for the three mentioned years were calculated by using GIS software.Meanwhile,the variation of the vegetation coverage in time and space was specifically analyzed in this area.The result shows that:Temporally,it shows that there is a gradual increase in vegetation coverage.However,bare land and micro vegetation was significantly reduced,low vegetation coverage and high vegetation coverage increased slowly.The trend for vegetation coverage indicated an obvious upward slope within the decade.From the spatial perspective,the overall vegetation coverage in Wulatehouqi was gradually increasing.Specifically,there is a high coverage rate in south-east area and a low one in north-west region.The coverage rate for high vegetation and medium vegetation increased steadily in Hetao Plain where south area of the Yinshan Mountains,moreover to the north region of the Yinshan Mountains,the coverage rate for micro vegetation reduced gradually in the desert and the semi desert steppe.The vegetation coverage increased by 2015.It had transformed from more coverage rate in micro vegetation to more coverage rate in low vegetation and medium vegetation whereas the coverage rate in high vegetation showed a trend of slight increase.A transformation of the majority of the coverage rate taken by low vegetation and medium vegetation whereas the coverage rate in high vegetation showed a trend of slight increase.

Key words: Wulatehouqi, vegetation coverage, change of time and space