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地理学报  2007 

1982~1999年我国东部暖温带植被生长季节的时空变化

DOI: 10.11821/xb200701005, PP. 41-51

Keywords: 物候季节,植被生长季节,物候累积频率拟合,归一化差值植被指数,中国东部暖温带

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Abstract:

利用1982~1996年5个站点的植物群落物候观测数据和物候累积频率拟合法,划分各站逐年的植被物候季节,并确定各季节初日对应的当地归一化差值植被指数(NDVI)阈值。在此基础上,通过对物候站各年NDVI曲线的年型聚类分析和区内所有像元逐年NDVI曲线的空间聚类分析,实现植被物候季节的时空外推估计,从而得到我国暖温带落叶阔叶林地区1982~1999年植被物候季节初日和生长季节长度的时空格局。结果表明,多年平均的植被物候季节初日和生长季节长度呈现出主要随纬度和海拔高度变化的空间格局。在这18年中,整个区域的物候春季初日以提前为主,且以华北平原提前的趋势最为显著;夏季、秋季和冬季初日以推迟为主,也以华北平原推迟的趋势比较显著;因此,华北平原植被生长季节呈显著延长的趋势。本文揭示的植被物候季节初日的趋势变化与华北地区各季节气温的趋势变化基本吻合;植被生长季节的趋势变化特征与欧洲单种植物物候生长季节,以及欧亚大陆和我国温带遥感植被生长季节的趋势变化基本一致,但植被生长季节初、终日期和长度的趋势值明显大于后者,表明该地区植物物候对于气候变暖的响应更加敏感。

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