Remote Sensing Analysis on Aeolian Desertification Trends in Northern China during 1975—2010
Remote Sensing Analysis on Aeolian Desertification Trends in Northern China during 1975—2010
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发表时间：
2011
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通讯作者：
Xie Jia-li
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作者：
Xie Jia-li
利用1975、1990、2000、2005和2010年中国北方地区Landsat MSS、TM/ETM遥感影像，通过目视解译方法提取不同时期的土地沙化现状数据，分析了近35年来中国北方地区土地沙化的变化趋势，得到以下结论：（1）2010年北方风沙化土地面积为37.59×104 km 2，其中轻度占33.80%，中度占22.84%，重度占22.16%，极重度占21.21%。(2)1975 ~ 1990年，中国北方土地沙化面积净增加33838.32 km 2，增长率为2255.89 km 2·a-1，沙化土地净加剧面积为33279.28 km 2; 1990 ~ 2000年，土地沙漠化面积净增加率为3441.49km2·a-1，净发展率为5370.06km2·a-1。北方荒漠化土地呈现恢复趋势，2000 - 2005年净减少面积为1635.28 km 2·a-1，净恢复率为10071.02 km 2·a-1。净减少率为1114.35km2·a-1，净逆转率为7552.21km2·a-1。土地荒漠化变化主要发生在半干旱区农牧交错带。
The data of aeolian desertification lands status in different periods have been extracted through visual interpretation method based on Landsat MSS,TM/ETM images in 1975,1990,2000,2005 and 2010 over the northern China areas.Hence,we analyzed the changing trend of aeolian desertification in northern China during the last 35 years,and have got some results as follows:(1) The area of aeolian desertification lands in northern China in 2010 are 37.59×104 km2,among which the slight grade accounts for 33.80%,the moderate grade for 22.84%,the severe grade for 22.16%,and the extremely severe grade for 21.21%.(2) From 1975 to 1990,the net increase area of land desertification area of northern China was 33 838.32 km2 with an increasing rate of 2 255.89 km2·a-1;the net area of land desertification lands being intensified was 33 279.28 km2;thus the net developing rate was 4 474.51 km2·a-1.From 1990 to 2000,the net increasing rate of land desertification area was 3 441.49 km2·a-1 and net developing rate was 5 370.06 km2·a-1.Since 2000,there was a recovering trend of land desertification lands in northern China.From 2000 to 2005,the net area decreasing rate was 1 635.28 km2·a-1,and the net reversion rate was 10 071.02 km2·a-1.From 2005 to 2010,the net area decreasing rate was 1 114.35 km2·a-1,and the net reversion rate was 7 552.21 km2·a-1.Changes of land desertification mainly occurred in the agro-pasture ecotone of semi-arid area.