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	Estimation of diffuse photosynthetically active radiation and the spatiotemporal variation analysis in China from 1981 to 2010
	Zhang L.; Zhang L.
	2014
关键词	photosynthetically active radiation (PAR) diffuse fraction diffuse PAR spatiotemporal variations solar-radiation carbon-dioxide productivity cloudiness components pinatubo surface forest impact
英文摘要	Photosynthetically active radiation (PAR) 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 Meteorology Administration. Then we derived the spatial data set of 10 km monthly diffuse PAR using ANUSPLIN software, and analyzed the spatiotemporal variation characteristics of diffuse PAR through GIS and trend analysis techniques. 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 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 the increasing amplitude at 0.03 mol m(-2) d(-1)/10a. But a significant declining trend is shown in the first 10 years, and obvious anomalies can be seen in 1982, 1983, 1991 and 1992. And there is a downtrend in spring and an uptrend in all the other seasons. (3) The spatial distribution of temporal variation rates of diffuse PAR is inhomogeneous across the country, generally decreasing in the north and increasing in the south.
出处	Journal of Geographical Sciences
卷	24
期	4
页	579-592
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29639]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhang L.,Zhang L.. Estimation of diffuse photosynthetically active radiation and the spatiotemporal variation analysis in China from 1981 to 2010. 2014.

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