黄河中游典型干旱区植被覆盖时空变化研究
Acta Agriculturae Jiangxi（2023）
Abstract
基于像元二分模型,利用2000-2019年MODIS NDVI数据以及气象观测数据,以吕梁市为例对黄河中游典型干旱区植被覆盖度进行估算,并采用趋势分析法、相关分析法对其植被覆盖度时空分布特征进行分析,探讨了主要气候因素(气温、降水量)与植被覆盖度的相关关系.结果表明:2000-2019年吕梁市植被覆盖度呈波动增加趋势,2017年达到最大值后在高位波动.植被高覆盖度地区主要分布在吕梁山山区,植被覆盖度增加区域面积占总面积的97.5％,植被覆盖度降低的区域仅占2.5％,植被覆盖度变异系数大的区域主要分布吕梁市西部沿黄河黄土高原丘陵区和东部平川盆地城市周边地区;吕梁市植被覆盖度与降水量、年平均气温均呈正相关关系,植被覆盖度与年平均气温呈正相关、负相关的面积占总面积的83％、17％;植被覆盖度与年平均降水量的正相关、负相关区域分别占总面积的98％、2％.吕梁市植被覆盖度与年平均气温的相关性小于其与年平均降水量的相关性,降水与植被覆盖度的影响较气温密切.
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