关键词: 沙化土地, 动态变化, 时空分析, 评价, RS, GIS

Abstract: In this paper, TM satellite image data acqui red in 1990, 1999 and 2005 and field survey data acquired in 2007 were used for the analysis on the state and dynamic changes of desertified land and its eveolution process in Toksun County, Xinjiang.The results showed that desertified land area was 804 751hm²,w hich accounted for 51.54% of w hole Toksun County area in 2005.The sandy land area in the southern part and farmland area was in ex tension process and the sandification land area cansed by w ind erosion in the eastern part was expanding seriously in the years from 1990 to 1999.And the southern area and farmland area of Toksun still was in extension period from 1999 to 2005.Since a series of control measures were adopted in the eastern enclosed area of Toksun, the sandy land area was reduced and began to become better gradually.Climate change was the main driving fo rce of the desertification in the southern part.In the eastern area climate change and human factors were the driving force.Based on comprehensive eco-enviro nment characteristics in study area, the paper put forw ard the corresponding desertification land control measures for each area.

Key words: decertified land, dynamic changes, spatial-temporal analysis, evaluation, RS, GIS