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1982—2006年祁连山植被覆盖的时空变化特征研究

DOI: 10.11867/j.issn.1001-8166.2015.07.0834, PP. 834-845

Keywords: GIMMS,NDVI,植被覆盖,时空变化,祁连山

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Abstract:

基于祁连山地区1982—2006年的GIMMSNDVI数据,采用最大值合成法、均值法、斜率分析法、相关分析法,研究了祁连山植被覆盖的时空变化及其与气候因子的相关性。结果表明①祁连山植被NDVI总体上自西向东递增,呈现东多西少的分布格局;②25a间植被NDVI变化存在明显的空间差异,表现为中西部地区植被NDVI增加,植被覆盖整体上呈增加趋势;③25a间祁连山不同季节植被NDVI变化存在明显的空间差异,夏季植被NDVI增加面积最大,其次为秋季、春季,植被NDVI减少面积最多的为冬季,而各季节植被NDVI增加区集中分布在青海南山、布哈河流域等地,植被NDVI减少区集中分布在乌鞘岭、冷龙岭及达坂山等地;④祁连山月平均NDVI与气温和降水的相关性极显著,可见气温和降水是影响祁连山植被NDVI变化的主要因子,局部地区密集的人类活动也是影响植被NDVI变化的重要因素。

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