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OALib Journal期刊
ISSN: 2333-9721
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黄河流域植被覆盖度动态变化与降水的关系
DOI: 10.11821/xb200106005, PP. 667-672
Keywords: 植被覆盖度,遥感,降水,黄河流域
Abstract:
利用8km分辨率PathfinderNOAA-NDVI数据,对黄河流域1982~1999年地表植被覆盖的空间分布及时间序列变化进行了分析,并通过计算不同时段降水量与年最大NDVI之间的相关系数分析了降水对流域植被覆盖的影响。结果发现近20年来黄河流域平均植被覆盖度有增加趋势,但青藏高原上有所减小;汛期降水量的多少对地表植被覆盖度的年际变化起主要作用,其中草原地区影响最显著,而在森林植被区及部分灌溉农作区,降水的年际变化对地表覆盖的影响比较小。
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