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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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1982-2006年中国东部春季植被变化的区域差异
DOI: 10.11821/xb201201006, PP. 53-61
Keywords: 中国东部,春季,植被活动,区域差异,NDVI
Abstract:
分析了中国东部1982-2006年4-5月归一化差值植被指数(NDVI)的空间格局和变化趋势空间分布,通过聚类分析辨识了植被活动变化过程的主要模态,并探讨了他们与温度和降水变化的相关关系。结果表明(1)多年平均的春季植被活动呈现南强北弱的分布特征,由强到弱的过渡带大约位于34°~39°N;(2)1982-2006年,华北平原、呼伦贝尔草原和洞庭湖平原的春季植被活动呈显著增强的趋势,其中华北平原NDVI增速高达0.03/10年(r2=0.52;p<0.001),长三角和珠三角地区则呈显著减弱的趋势,其中长三角地区NDVI减速达-0.016/10年(r2=0.24;p=0.014);(3)1982-2006年春季植被活动变化过程的区域差异鲜明,并呈现层次性特征,首先是长三角和珠三角与其他地区的差异,前者呈减弱趋势,后者呈增强趋势,其次是呼伦贝尔草地、华北以及江南—华南地区与东北地区、内蒙古东部和东南部及长江下游地区的差异,前者持续增强,后者以1998年为分界点先增强后减弱,再次是各个模态年际变率的差异;(4)半湿润—半干旱的草地和农田区植被活动与降水量变化显著正相关,半湿润—湿润的森林区植被活动与温度变化显著正相关,温度或者降水最高能解释NDVI60%的方差。
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