Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1029/2019WR024815 |
Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem | |
Cui, Jiangpeng; Tian, Lide; Wei, Zhongwang; Huntingford, Chris; Wang, Pei; Cai, Zhongyin; Ma, Ning; Wang, Lixin | |
通讯作者 | Cui, JP |
来源期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:4 |
英文摘要 | Quantifying the transpiration fraction of evapotranspiration (T/ET) is crucial for understanding plant functionality in ecosystem water cycles, land-atmosphere interactions, and the global water budget. However, the controls and mechanisms underlying the temporal change of T/ET remain poorly understood in arid and semiarid areas, especially for remote regions with sparse observations such as the Tibetan Plateau (TP). In this study, we used combined high-frequency laser spectroscopy and chamber methods to constrain estimates of T/ET for an alpine meadow ecosystem in the central TP. The three isotopic end members in ET (delta (ET)), soil evaporation (delta (E)), and plant transpiration (delta (T)) were directly determined by three newly customized chambers. Results showed that the seasonal variations of delta (ET), delta (E), and delta (T) were strongly affected by the precipitation isotope (R-2 = 0.53). The delta O-18-based T/ET agreed with that of delta H-2. Isotope-based T/ET ranged from 0.15 to 0.73 during the periods of observation, with an average of 0.43. This mean result was supported by T/ET derived from a two-source model and eddy covariance observations. Our overarching finding is that at the seasonal timescale, surface soil water content (theta) dominated the change of T/ET, with leaf area index playing only a secondary role. Our study confirms the critical impact of soil water on the temporal change of T/ET in water-limited regions such as the TP. This knowledge sheds light on diverse land-surface processes, global hydrological cycles, and their modeling. Key Points Laser spectroscopy and the chamber method were used to estimate T/ET in the central Tibetan Plateau Near-surface soil water content dominated the temporal change of T/ET, with leaf area index playing a secondary role Our study highlights the critical impact of environmental conditions on the temporal change of T/ET in water-limited regions |
英文关键词 | chamber evapotranspiration partitioning leaf area index soil water content stable isotopes Tibetan Plateau |
类型 | Article |
语种 | 英语 |
开放获取类型 | Green Accepted, Green Published |
收录类别 | SCI-E |
WOS记录号 | WOS:000538987800024 |
WOS关键词 | STABLE-ISOTOPE PROFILES ; WATER-VAPOR ; STATE TRANSPIRATION ; VEGETATION CONTROL ; SOIL EVAPORATION ; LEAF WATER ; FLUXES ; DELTA-O-18 ; OXYGEN ; MODEL |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
来源机构 | 北京师范大学 ; 北京大学 ; 中国科学院青藏高原研究所 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/324677 |
作者单位 | [Cui, Jiangpeng; Ma, Ning] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Plateau Environm Change & Land Su, Beijing, Peoples R China; [Cui, Jiangpeng] Peking Univ, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing, Peoples R China; [Tian, Lide; Cai, Zhongyin] Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming, Yunnan, Peoples R China; [Wei, Zhongwang] Sun Yat Sen Univ, Sch Atmospher Sci, Southern Marine Sci & Engn Guangdong Lab Zhuhai, Guangdong Prov Key Lab Climate Change & Nat Disas, Guangzhou, Peoples R China; [Wei, Zhongwang] Univ Tokyo, Chiba Expt Stn, Inst Ind Sci, Chiba, Japan; [Huntingford, Chris] Ctr Ecol & Hydrol, Wallingford, Oxon, England; [Wang, Pei] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; [Wang, Lixin] Indiana Univ Purdue Univ Indianapolis, Dept Earth Sci, Indianapolis, IN USA |
推荐引用方式 GB/T 7714 | Cui, Jiangpeng,Tian, Lide,Wei, Zhongwang,et al. Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem[J]. 北京师范大学, 北京大学, 中国科学院青藏高原研究所,2020,56(4). |
APA | Cui, Jiangpeng.,Tian, Lide.,Wei, Zhongwang.,Huntingford, Chris.,Wang, Pei.,...&Wang, Lixin.(2020).Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem.WATER RESOURCES RESEARCH,56(4). |
MLA | Cui, Jiangpeng,et al."Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem".WATER RESOURCES RESEARCH 56.4(2020). |
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