摘要
[目的]评估鄂尔多斯实施禁牧、休牧政策以来获得的成效。[方法]以MODIS长时间序列的植被指数产品为数据源,利用像元二分模型研究了2000—2012年植被生长期5—9月份鄂尔多斯禁牧区的植被覆盖度及其时空变化特征。并采用转移矩阵的方法,分析了年度间植被覆盖度高低变化的方向。[结果]研究区植被覆盖度自东向西逐渐减小,东部高于西部,北部高于南部;2000—2012年研究区植被覆盖度总体呈上升趋势,均有低等级植被覆盖度向高等级植被覆盖度转化的趋势;2008—2012年植被恢复状况比2000—2004年和2004—2008年这两个阶段更优。[结论]禁牧政策使研究区植被长势逐年改善,禁牧、休牧政策对草原生态恢复起到了良好的作用。
[Objective]To evaluate effects of graze-prohibited policy implemented in Ordos area.[Methods]Using the the coverage index elicited by two-pixel model from MODIS-NDVI as the data source,to evaluate the spatial-temporal changes of growth seasonal vegetation coverage in no grazing district from 2000 to 2012,and to analyze the annual change using transfer matrix.[Results]The vegetation coverage reduced gradually from east to west,the vegetation coverage in the eastern division was higher than that in the west,the coverage in the north was higher than that in the south.The vegetation cover generally increased from 2000to2012,with a changing tendency from low to high vegetation cover.In the periods of 2008—2012,the vegetation coverage was better than that of 2000—2004and 2004—2008.[Conclusion]The study area had a significant increase in the vegetation coverage,which indicates that the graze-prohibited policy have a great effect on the grassland ecological restoration.
出处
《水土保持通报》
CSCD
2015年第2期136-140,共5页
Bulletin of Soil and Water Conservation
基金
国家科技支撑计划项目"重大自然灾害风险评估技术研究"(2013BAK05B01-03)
