Effects of sky conditions on net ecosystem productivity of a subtropical coniferous plantation vary from half-hourly to daily timescales

doi:10.1016/j.scitotenv2018.10.190

	Effects of sky conditions on net ecosystem productivity of a subtropical coniferous plantation vary from half-hourly to daily timescales
	Han, Jiayin 1,2; Zhang, Leiming 1,2; Li, Shenggong 1,2; Wen, Xuefa 1,2; Li, Qingkang 1; Wang, Huimin 1,2
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2019-02-15
卷号	651 页码:3002-3014
关键词	Diffuse radiation Eddy covariance NEE Temporal variation Path analysis
ISSN号	0048-9697
DOI	10.1016/j.scitotenv2018.10.190
通讯作者	Zhang, Leiming(zhanglm@igsnrr.ac.cn) ; Li, Shenggong(lisg@igsnrr.ac.cn)
英文摘要	The dynamic changes of solar radiation have received wide attention in global change studies, but there are controversies about the influence of diffuse radiation on ecosystem carbon sequestration. Using eddy covariance measurements from 2010 to 2012, the effects of sky conditions extracted from adjacent sunny, cloudy, and overcast days on net ecosystem productivity (NEP) of a subtropical coniferous plantation were examined from half-hourly to daily scales. Half-hourly NEP responded to the changing radiation more efficiently on overcast days compared to sunny days, but such response did not differ obviously between cloudy and sunny days. Compared with sunny conditions, apparent quantum yield (alpha) under overcast (cloudy) conditions changed 282.4% (41.7%) in spring, 140.3% (-42%) in summer, 218.5% (38.9%) in autumn, and 146.2% (0.5%) in winter, respectively: annually. a under overcast (cloudy) conditions increased by 225.9% (19.8%) in 2010, 189.8% (6.0%) in 2011. and 159.5% (21.4%) in 2012, respectively. Moreover, the potential NEP at the light intensity of 150 and 750 W m(-2) was improved due to increased diffuse fraction. However, both daytime NEP and daily NEP were significantly lower under overcast skies than under sunny and cloudy skies. Compared with sunny days, daily NEP on overcast days decreased by 127.7% in spring. 126.4% in summer, 121.8% in autumn, and 100.6% in winter, respectively: annually, daily NEP decreased by 122.5% in 2010. 141.7% in 2011, and 109.9% in 2012, respectively. Diurnal patterns of daily NEP were quite similar between sunny and cloudy days. Both path analysis and multiple regression showed that solar radiation, especially diffuse radiation, was responsible for the variations of NEP under different skies across seasons, but this effect may be weakened by seasonal droughts. This study implies that the effects of sky conditions on NEP are timescale dependent and should be paid more attention in ecosystem carbon cycle study. (C) 2018 Elsevier B.V. All tights reserved.
资助项目	National Key Research and Development Program of China[2017YFC0503801] ; National Key Research and Development Program of China[2016YFD0600202]
WOS关键词	CARBON-DIOXIDE EXCHANGE ; EDDY COVARIANCE TECHNIQUE ; FOREST ECOSYSTEMS ; DIFFUSE-RADIATION ; ENVIRONMENTAL CONTROLS ; SOIL RESPIRATION ; USE EFFICIENCY ; IMPACT ; WATER ; TEMPERATURE
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000450551600125
资助机构	National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/51518]
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.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Han, Jiayin,Zhang, Leiming,Li, Shenggong,et al. Effects of sky conditions on net ecosystem productivity of a subtropical coniferous plantation vary from half-hourly to daily timescales[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,651:3002-3014.
APA	Han, Jiayin,Zhang, Leiming,Li, Shenggong,Wen, Xuefa,Li, Qingkang,&Wang, Huimin.(2019).Effects of sky conditions on net ecosystem productivity of a subtropical coniferous plantation vary from half-hourly to daily timescales.SCIENCE OF THE TOTAL ENVIRONMENT,651,3002-3014.
MLA	Han, Jiayin,et al."Effects of sky conditions on net ecosystem productivity of a subtropical coniferous plantation vary from half-hourly to daily timescales".SCIENCE OF THE TOTAL ENVIRONMENT 651(2019):3002-3014.