IMHE OpenIR  > 山地表生过程与生态调控重点实验室
The asynchronous response of carbon gain and water loss generate spatio-temporal pattern of WUE along elevation gradient in southwest China
Sun Xiangyang1; Wang Genxu1; Huang Mei2; Chang Ruiying1; Hu Zhaoyong1; Song Chunlin1; Sun Juying1,3
Corresponding AuthorWang Genxu(wanggx@imde.ac.cn)
2020-02-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
Volume581Pages:124389
SubtypeArticle
Contribution Rank1
AbstractWater 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.
Keywordcarbon gain water loss southwest China
DOI10.1016/j.jhydrol.2019.124389
Indexed BySCI
WOS KeywordAGE-RELATED-CHANGES ; USE EFFICIENCY ; ISOTOPE DISCRIMINATION ; LEAF DELTA-C-13 ; CLIMATE-CHANGE ; ECOSYSTEM ; ABIES ; FOREST ; DIOXIDE ; TREES
Language英语
Funding ProjectNational 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 Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000514758300032
Funding OrganizationNational Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/34076
Collection山地表生过程与生态调控重点实验室
Corresponding AuthorWang Genxu
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China;
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
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,2020,581:124389.
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,581,124389.
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):124389.
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