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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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锡林郭勒草原生态恢复工程效果的评价
DOI: 10.11821/xb200705003, PP. 471-480
Keywords: 草原恢复,植被—气候响应模型,遥感,NDVI,放牧压力指数,锡林郭勒草原
Abstract:
针对锡林郭勒草原的严重退化,近年来启动了草原生态恢复工程,但工程实施的效果由于范围广、时间短而很难予评价。利用锡林郭勒草原地区1999~2004年的SPOT-VGT10天最大值合成NDVI时间序列数据,在求得各年NDVI年最大值(NDVImax)的基础上,通过搜寻各像元邻域内NDVImax的最大值以及与之相应的气候因子,建立起了像元尺度上的气候—植被生长基准响应模型,并以此为依据运用相对残差趋势法识别出了处于恢复阶段的草原区域。最后,将遥感监测结果与羊单位统计资料进行对比分析,结果发现,在县级行政区域尺度上的平均恢复趋势与基于羊单位和NPP构建的放牧压力趋势具有较好的反比例关系,初步证明了该方法在时间序列较短情况下的有效性。
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