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OALib Journal期刊
ISSN: 2333-9721
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2001-2013年华北地区植被覆盖度与干旱条件的相关分析
DOI: 10.11821/dlxb201505004, PP. 717-729
Keywords: 华北地区,植被覆盖度,PDSI,生态区,相关分析
Abstract:
基于MODIS-NDVI遥感数据以及地表气象数据,计算了2001-2013年华北地区的修正Palmer干旱指数（PalmerDroughtSeverityIndex,PDSI）和植被覆盖度,总结出植被覆盖度以及PDSI的年际变化规律,从华北地区生态分区的角度分析了二者的相关关系。结果表明①华北平原的植被覆盖度呈南高北低、中部高四周低的分布特点,最低为内蒙古高原草原生态区的0.61,最高为淮阳丘陵地区的0.84;②2001-2013年,华北平原整体植被覆盖度主要呈上升趋势,其中华北的北部、西部、南部山区及丘陵地带植被覆盖度主要呈上升趋势,而华北平原农业区以及京津唐城郊地带植被覆盖度呈下降趋势;③华北地区的东北部有变潮湿的趋势,南部则有变干旱的趋势,其他地区干旱条件变化不明显;④华北地区植被覆盖度与气候干旱程度的平均相关系数为0.20,73.37%的地区相关系数为正,正相关关系最为明显的地区为华北地区的西北部,而北京、天津、以及河北省与河南省一级、二级城市的城郊地区相关系数多为负值。⑤在华北大部分地区,夏季和秋季的气候干旱条件对植被覆盖度的影响最为明显。
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