气候变化领域集成服务门户(CCPortal): A simple method to simulate diurnal courses of PAR absorbed by grassy canopy

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DOI	10.1016/j.ecolind.2014.06.017
	A simple method to simulate diurnal courses of PAR absorbed by grassy canopy
	Cao, Ruyin; Shen, Miaogen; Chen, Jin; Tang, Yanhong
通讯作者	Chen, J (通讯作者)
发表日期	2014
ISSN	1470-160X
EISSN	1872-7034
起始页码	129
结束页码	137
卷号	46
英文摘要	The fraction of photosynthetically active radiation absorbed by vegetation (FAPAR) quantifies the efficiency of absorbing PAR by plants. Accurate estimation of diurnal variation of FAPAR however remains a challenge because of the dynamic changes of incident light conditions and its interaction with canopy structure. Based on a field experiment, we characterized the effects of solar zenith angle (SZA) and fraction of diffuse light (fdPAR) on diurnal FAPAR in an alpine wetland on the Tibetan plateau. We found an obvious nonlinear change pattern of FAPAR against SZA with a maximum value of FAPAR at the SZA of about 30 degrees, and opposite responses of FAPAR to fdPAR outside of a SZA range between 21 degrees and 30 degrees. A cuive fitting (CF) method was proposed to estimate diurnal FAPAR in a rapid and accurate way. The CF method accounting for the interactions of SZA and fdPAR on FAPAR can successfully describe the diurnal dynamics of FAPAR under clear and cloudy sky conditions. The estimation deviation of daily FAPAR was only -0.28% for a period of about eight days with various sky conditions. The new method requires only very simple field measurements, but has higher accuracy than the widely-used light penetration model, which is expected to be widely used in grassy vegetations. (C) 2014 Elsevier Ltd. All rights reserved.
关键词	PHOTOSYNTHETICALLY ACTIVE RADIATION LEAF-AREA INDEX CYCLOPES GLOBAL PRODUCTS TERRESTRIAL ECOSYSTEMS THEORETICAL ANALYSIS VEGETATION LIGHT MODEL MODIS ALGORITHM
英文关键词	Alpine wetland; Curve fitting method; Diffuse light; Diurnal FAPAR; Light penetration model; Qinghai-Tibetan Plateau
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Environmental Sciences
WOS记录号	WOS:000342656100015
来源期刊	ECOLOGICAL INDICATORS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258314
推荐引用方式 GB/T 7714	Cao, Ruyin,Shen, Miaogen,Chen, Jin,et al. A simple method to simulate diurnal courses of PAR absorbed by grassy canopy[J]. 中国科学院青藏高原研究所,2014,46.
APA	Cao, Ruyin,Shen, Miaogen,Chen, Jin,&Tang, Yanhong.(2014).A simple method to simulate diurnal courses of PAR absorbed by grassy canopy.ECOLOGICAL INDICATORS,46.
MLA	Cao, Ruyin,et al."A simple method to simulate diurnal courses of PAR absorbed by grassy canopy".ECOLOGICAL INDICATORS 46(2014).