Effects of diffuse photosynthetically active radiation on gross primary productivity in a subtropical coniferous plantation vary in different timescales

doi:10.1016/j.ecolind.2020.106403

	Effects of diffuse photosynthetically active radiation on gross primary productivity in a subtropical coniferous plantation vary in different timescales
	Han, Jiayin 1,2,3,4; Guo, Chuying 2,3; Ye, Shu 2,3; Zhang, Leiming 2,3; Li, Shenggong 2,3; Wang, Huimin 2,3; Yu, Guirui 2,3
刊名	ECOLOGICAL INDICATORS
	2020-08-01
卷号	115 页码:12
关键词	Diffuse fraction Eddy covariance Light-use efficiency model Path analysis Timescale effects
ISSN号	1470-160X
DOI	10.1016/j.ecolind.2020.106403
通讯作者	Zhang, Leiming(zhanglm@igsnrr.ac.cn) ; Li, Shenggong(lisg@igsnrr.ac.cn)
英文摘要	Effects of diffuse radiation on ecosystem carbon sequestration are widely concerned, but the effects are unclear across timescales. Besides, whether the light-use efficiency (LUE) model modified by diffuse radiation could improve the performances for simulating gross primary productivity (GPP) was seldom taken into consideration. Based on path analysis method, this paper employed 2003-2015 flux data in a subtropical coniferous plantation to quantify standardized total effects (STE) of diffuse photosynthetically active radiation (PAR(d)), direct photo-synthetically active radiation (PAR(b)), air temperature (T-a), volumetric soil water content (SWC), and vapor pressure deficit (VPD) on GPP from daily to yearly timescales. Impact of diffuse radiation on simulating GPP was investigated by incorporating diffuse fraction (k(d)) term into an LUE model at daily scale. Results showed that significant STE of environmental variables on GPP was sorted: PAR(d) > PAR(b) > T-a > SWC > VPD, at daily scale; PAR(d) > PAR(b) > SWC > T-a > VPD, at monthly scale; PAR(b) > SWC > T-a > VPD, at seasonal scale; PAR(b) > SWC > VPD, at yearly scale. From daily to yearly scale, STE of PAR(d) on GPP decreased, also became non-significant at seasonal and yearly scales. At daily scale, PAR(d) played a major role in promoting GPP under sunny, cloudy, and overcast sky conditions. Compared with LUE model without k(d), the performances of LUE model were improved after incorporating k(d): on average, determination coefficient (R-2) increased by 4%; root mean square error (RMSE) decreased by 20.7%; and explanation of observed GPP variability increased by 33.2%. The improvements were also reflected in simulating seasonal dynamics, simulating under extreme environmental stresses, and simulating under various sky conditions. This study highlights the effects of diffuse radiation on GPP decline from short- to long-term timescales and identifies the LUE model could be improved by k(d).
资助项目	National Natural Science Foundation of China[31570446] ; National Key R&D program of China[2017YFC0503801] ; Projects of International Cooperation and Exchanges NSFC[31420103917]
WOS关键词	NET ECOSYSTEM EXCHANGE ; LIGHT-USE EFFICIENCY ; EDDY COVARIANCE TECHNIQUE ; CARBON-DIOXIDE EXCHANGE ; FOREST ECOSYSTEMS ; INTERANNUAL VARIABILITY ; SOLAR-RADIATION ; SKY CONDITIONS ; FLUX ; IMPACT
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000561438700018
资助机构	National Natural Science Foundation of China ; National Key R&D program of China ; Projects of International Cooperation and Exchanges NSFC
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/158054]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Leiming; Li, Shenggong
作者单位	1.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 4.Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Han, Jiayin,Guo, Chuying,Ye, Shu,et al. Effects of diffuse photosynthetically active radiation on gross primary productivity in a subtropical coniferous plantation vary in different timescales[J]. ECOLOGICAL INDICATORS,2020,115:12.
APA	Han, Jiayin.,Guo, Chuying.,Ye, Shu.,Zhang, Leiming.,Li, Shenggong.,...&Yu, Guirui.(2020).Effects of diffuse photosynthetically active radiation on gross primary productivity in a subtropical coniferous plantation vary in different timescales.ECOLOGICAL INDICATORS,115,12.
MLA	Han, Jiayin,et al."Effects of diffuse photosynthetically active radiation on gross primary productivity in a subtropical coniferous plantation vary in different timescales".ECOLOGICAL INDICATORS 115(2020):12.