Solar energy dominates and soil water modulates net ecosystem productivity and evapotranspiration across multiple timescales in a subtropical coniferous plantation

doi:10.1016/j.agrformet.2020.108310

	Solar energy dominates and soil water modulates net ecosystem productivity and evapotranspiration across multiple timescales in a subtropical coniferous plantation
	Tang, Yakun 1; Jia, Chang 1; Wang, Lina 1; Wen, Xuefa 2; Wang, Huimin 2
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-04-15
卷号	300 页码:12
关键词	Coniferous plantation Eddy covariance ET NEP Wavelet analysis
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2020.108310
通讯作者	Wen, Xuefa(wenxf@igsnrr.ac.cn)
英文摘要	The timescale dependence of environmental factors' influence on net ecosystem productivity (NEP), evapotranspiration (ET), and the effect of high and cool air temperature (Ta) across multiple timescales need to be quantified to identify the response mechanisms of forest ecosystems. We analyzed NEP and ET over 11 years in a subtropical coniferous plantation, and wavelet analysis was used to determine spectrum characteristics of these fluxes and quantify the time lag between these fluxes and environmental factors from daily to annual timescales. The NEP and ET had significant daily and annual spectrum variabilities, but ET exhibited a broader significant spectrum than NEP from days to months timescales. At daily and annual timescales, NEP was significantly synchronized with, and preceded photosynthetically active radiation (PAR) and Ta by 1. 12 +/- 0.6 h and 23.16 +/- 17 days, respectively. Meanwhile, ET was significantly synchronized with net radiation (Rn) at both daily and annual timescales, lagging Rn by 1.15 +/- 1.4 h, but preceding it by 5.73 +/- 4.39 days, respectively. From days to months timescales, with no continuous significant effect, NEP preceded PAR and vapor pressure deficit (VPD), and lagged soil water content (SW); however, ET only preceded Rn and VPD. In addition, summer high-Ta enhanced the effect of SW on NEP and ET across multiple timescales. Early spring cool-Ta shortened the time lag between PAR and NEP at daily and annual timescales, but only shortened it between Ta and ET at a daily timescale. This study demonstrated the more modulating effect of SW on the dominant influence of solar energy on NEP than ET, with timescale increased. This study also indicated that NEP and ET were more sensitive to high-than cool-Ta, and the time lag effects of these Ta events should be considered separately to adequately acknowledge the response mechanisms of these fluxes.
资助项目	National Key Research and Development Program of China[2017YFC0503904] ; National Key Research and Development Program of China[2016YFC0500205] ; National Natural Science Foundation of China[41977425]
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000635674500002
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161960]
专题	中国科学院地理科学与资源研究所
通讯作者	Wen, Xuefa
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Tang, Yakun,Jia, Chang,Wang, Lina,et al. Solar energy dominates and soil water modulates net ecosystem productivity and evapotranspiration across multiple timescales in a subtropical coniferous plantation[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,300:12.
APA	Tang, Yakun,Jia, Chang,Wang, Lina,Wen, Xuefa,&Wang, Huimin.(2021).Solar energy dominates and soil water modulates net ecosystem productivity and evapotranspiration across multiple timescales in a subtropical coniferous plantation.AGRICULTURAL AND FOREST METEOROLOGY,300,12.
MLA	Tang, Yakun,et al."Solar energy dominates and soil water modulates net ecosystem productivity and evapotranspiration across multiple timescales in a subtropical coniferous plantation".AGRICULTURAL AND FOREST METEOROLOGY 300(2021):12.