The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China

doi:10.1016/j.jhydrol.2019.124389

	The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China
	Sun Xiangyang 2; Wang Genxu 2; Huang Mei 3; Chang Ruiying 2; Hu Zhaoyong 2; Song Chunlin 2; Sun Juying 1,2
刊名	JOURNAL OF HYDROLOGY
	2020-02-01
卷号	581 页码:13
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.124389
通讯作者	Wang Genxu(wanggx@imde.ac.cn)
英文摘要	Water use efficiency (WUE) is a key characteristic of ecosystem function, and reflects the trade-off relationship between carbon gain and water loss. The coupled relationship between carbon and water is complex for ecosystems, especially along elevation gradient. A foliage stable carbon isotope method and the AVIM2 model were used to study the temporal and elevational pattern of carbon gain, water loss and WUE in subalpine dark coniferous forests (Abies fabri). The results showed that monthly WUE in wet season was larger than in dry season. The diverse response curves between carbon gain, water loss and meteorological factors, such as monthly precipitation, air temperature (Ta), vapor pressure deficit (VPD) and net radiation (Rn), determined the monthly variation of WUE. Both the carbon gain (gross primary production, GPP; net primary production, NPP) and water loss (evapotranspiration, ET; transpiration, Et) decreased as elevation increased. The carbon gain exhibited moderately decreasing rate compared with that of water loss along the elevation gradient. Plant WUE (GPP/Et or NPP/Et) exhibited an increasing trend along the elevation gradient, comparing with ecosystem WUE (GPP/ET or NPP/ET) only increased from 2800 to 3500 m a.s.l. and slightly decreased as elevation continue increasing to 3700 m a.s.l. The ratio of canopy interception to ET determined the varied elevational pattern of WUE between plant and ecosystem scale. Air temperature contributed 79.27% and 68.66% for elevational pattern of GPP and transpiration (Et), respectively. While Ta and c(i)/c(a) (ratio of intercellular and air CO2 concentration) contributed 50.67% and 47.67 to the variation of GPP/Et along elevation gradient, respectively. The canopy height and canopy coverage were significantly negative with WUE along the elevation gradient. The asynchronous response of the carbon gain and water loss to climatic and physiological variables determined the temporal and elevational patterns of ecosystem WUE.
资助项目	National Natural Science Foundation of China[41790431] ; National Natural Science Foundation of China[41890821] ; Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-DQC006] ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS[SDS-135-1702]
WOS关键词	AGE-RELATED-CHANGES ; USE EFFICIENCY ; ISOTOPE DISCRIMINATION ; LEAF DELTA-C-13 ; CLIMATE-CHANGE ; ECOSYSTEM ; ABIES ; FOREST ; DIOXIDE ; TREES
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000514758300032
资助机构	National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/132764]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang Genxu
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Sun Xiangyang,Wang Genxu,Huang Mei,et al. The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China[J]. JOURNAL OF HYDROLOGY,2020,581:13.
APA	Sun Xiangyang.,Wang Genxu.,Huang Mei.,Chang Ruiying.,Hu Zhaoyong.,...&Sun Juying.(2020).The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China.JOURNAL OF HYDROLOGY,581,13.
MLA	Sun Xiangyang,et al."The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China".JOURNAL OF HYDROLOGY 581(2020):13.