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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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1981-2010年中国散射光合有效辐射的估算及时空特征分析
DOI: 10.11821/dlxb201403004, PP. 323-333
Keywords: 散射光合有效辐射,散射比例,光合有效辐射,时空变化特征
Abstract:
光合有效辐射（Photosyntheticallyactiveradiation，PAR）是植物光合作用的主要能量来源，其散射组分能够增强植被冠层光能利用率，从而增加碳吸收。因此，散射PAR是生态系统生产力模型的重要驱动因子。本文尝试估算我国1981-2010年的散射PAR，通过空间化得到近30年月尺度10km分辨率的散射PAR空间数据集，并分析了其空间分布特征和时间变化趋势。结果表明（1）1981-2010年散射PAR多年平均值的空间分布具有明显的空间异质性，总体上东北部较低，南部和西部较高。全国范围内的多年平均值在6.66~15.27molm-2d-1之间，且夏季散射PAR最大，冬季最小。（2）1981-2010年全国所有像素散射PAR年平均值表现出明显的上升趋势，上升幅度为0.03molm-2d-1/10a；但前10年下降趋势明显，且1982、1983、1991和1992年存在明显异常。春季的散射PAR呈现微弱的下降趋势，其他季节均呈上升趋势。（3）1981-2010年散射PAR时间变化率的空间分布具有明显的季节变化和区域差异，我国大体呈现南部区域上升，北部区域下降。
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