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地理学报  2010 

近50年中国光合有效辐射的时空变化特征

DOI: 10.11821/xb201003002, PP. 270-280

Keywords: 光合有效辐射(PAR),Mann-Kendall趋势分析,中国

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Abstract:

基于中国陆地区域1961-2007年逐年/季节平均光合有效辐射(PAR)的空间化数据(10km×10km),结合GIS空间分析技术与Mann-Kendall趋势分析方法对近50年年/季节平均PAR进行时空变化特征分析。结果表明①全国PAR的空间分布差异明显,总体上呈现东南低、西部高的特点,年均PAR在17.7~39.5molm-2d-1之间。②全国像元平均的年/季节平均PAR表现出一个较明显的波动下降过程,年均PAR降幅为0.138molm-2d-1/10a,不同季节下降幅度存在差异,夏季降幅最大。③逐像元分析显示全国大部分地区PAR呈现显著下降趋势(α=0.05),东部趋势变化较西部明显,夏冬两季在PAR年际变化中的贡献最大。华北地区在不同季节都是下降区域,而青藏高原西北地区在不同季节都表现为上升趋势。④PAR年际变化率空间分布在不同时段差异明显,同一地区PAR年际变化率不仅在不同季节存在差异,而且在不同时段也不相同,总体上1990年代之前PAR下降较快,之后下降趋势变缓。

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