摘要
以川西北阿坝地区多年沙化土地调查为基础,对该地区1994年、1999年、2004年和2009年4个时期的沙化土地状况及动态变化进行分析,结果显示该地区土地沙化过程明显,沙化土地面积持续扩展,植被退化严重。从不同时间段看,1994-2004年的10 a间沙化土地扩展迅速,自2004年以来由于治沙工程的实施和其他生态保护措施,沙化土地扩展势态有所缓解,扩展速度有所下降,年扩展速率从10 a前的6%下降到目前的0.6%。气象数据和人文统计数据分析表明,沙化土地持续发展与近30 a来气温上升、降水减少、人口增长和牲畜数量快速增加关系密切。
Based on the investigation for years on the sandy land of Aba district in northwest Sichuan Province,we analyzed the condition and dynamic changes of sandy land of 4 years including 1994,1999,2004 and 2009,of the district,the results show that the process of land desertification in this region is significant,the area of sandy land extends continuously,and vegetation degrades severely.From the point of view of different periods,we see that during the 10 years from 1994 to 2004,the extension of sandy land is fast.Since 2004,the trend of extension of sandy land had reduced,the extension speed slowed down,and annual extension rate droped from 6% 10 years ago to 0.6% at present.Analysis on meteorological data and social statistical data indicates that the persistent progress of sandy land tightly linked with rise of temperature,decrease of precipitation,growth of population and the rapid increment of amount of livestock over the last 30 years in this region.
出处
《水土保持研究》
CSCD
北大核心
2011年第3期51-54,共4页
Research of Soil and Water Conservation
基金
国家自然科学基金(18273748498)
关键词
沙化土地
动态变化
驱动力
阿坝地区
sandy land
dynamic change
driving factor
Aba district
