地理学报 ›› 2014, Vol. 69 ›› Issue (3): 323-333.doi: 10.11821/dlxb201403004

• 自然地理 • 上一篇    下一篇

1981-2010年中国散射光合有效辐射的估算及时空特征分析

任小丽1,2, 何洪林1, 张黎1, 于贵瑞1   

  1. 1. 中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京100101;
    2. 中国科学院大学, 北京100049
  • 收稿日期:2013-09-18 修回日期:2014-01-10 出版日期:2014-03-20 发布日期:2014-06-10
  • 通讯作者: 何洪林(1971- ),男,湖南人,研究员。E-mail:hehl@igsnrr.ac.cn E-mail:hehl@igsnrr.ac.cn
  • 作者简介:任小丽(1984- ),女,河北人,博士研究生。E-mail:xlren_lydia@hotmail.com
  • 基金资助:
    中国科学院先导专项(XDA05050600);国家科技部环保公益性行业科研专项(201109030);国家级自然保护区保护成效评估与规范化建设关键技术研究(201209028-4)

Assessment of the spatiotemporal variations of diffuse photosynthetic active radiation in China from 1981 to 2010

REN Xiaoli1,2, HE Honglin1, ZHANG Li1, YU Guirui1   

  1. 1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-09-18 Revised:2014-01-10 Online:2014-03-20 Published:2014-06-10
  • Supported by:
    Strategic Priority ResearchProgram of the Chinese Academy of Sciences,No.XDA05050600;The Environmental Protection PublicWelfare Industry Targeted Research Fund,No.201109030;Research on the key technology of effectivenessevaluation and standardized construction of National Nature Reserves,No.201209028-4

摘要: 光合有效辐射(Photosynthetically active radiation,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10 km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6.66~15.27 mol m-2 d-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0.03 mol m-2 d-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。

关键词: 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: Photosynthetically active radiation is the energy source of plant photosynthesis, and the diffuse component can enhance canopy light use efficiency, thereby increasing the carbon uptake. Therefore, diffuse PAR is an important driving factor of ecosystem productivity models. In this study, we estimated the diffuse PAR of over 700 meteorological sites in China from 1981 to 2010 using an empirical model based on observational data from Chinese Ecosystem Research Network (CERN) and China Meteorological Administration. Then we derived the spatial data set of 10 km monthly diffuse PAR using ANUSPLIN software, and analyzed the spatiotemporal variation of diffuse PAR through GIS and trend analysis. The results showed that: (1) the spatial patterns of annual average diffuse PAR during 1981-2010 are heterogeneous across China, lower in the northeast and higher in the west and south. The nationwide average value for the 30 years ranges from 6.66 mol m-2 d-1 to 15.27 mol m-2 d-1, and the value in summer is the biggest while the value in winter is the smallest. (2) There is an evident increasing trend of annual diffuse PAR during recent 30 years, with increasing amplitude at 0.03 mol m-2 d-1/10a. But a significant declining trend is observed in the first 10 years, and obvious anomalies can be seen in 1982, 1983, 1991 and 1992. And there is a downward trend in spring and an upward one in all other seasons. (3) The spatial distribution of temporal variation rates of diffuse PAR is inhomogeneous across the whole country, generally decreasing in the north and increasing in the south.

Key words: photosynthetically active radiation, spatiotemporal variations, diffuse fraction, diffuse PAR