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| Divergent forcing of water use efficiency from aridity in two meadows of the Mongolian Plateau | |
| Dong, Gang1,2,3; Zhao, Fangyuan1,4; Chen, Jiquan5; Qu, Luping6; Jiang, Shicheng7; Chen, Jingyan8,9; Shao, Changliang1,2 | |
| 2021 | |
| 发表期刊 | JOURNAL OF HYDROLOGY
 |
| ISSN | 0022-1694 |
| 卷号 | 593 |
| 摘要 | The future climate change predicts higher drought risks in deteriorating the functions and services of dryland ecosystems. Interpreting the sensitivity of ecosystem water use efficiency (WUE) to aridity could provide important environmental implications to water conservation and carbon budgets of drylands. The effects of temporal aridity changes on WUE in semi-arid ecosystems, particularly in meadow steppes, have been poorly investigated. In this study, we used eddy-covariance data from two representative temperate meadows on Mongolian Plateau, Changling (2007-2015, China) and Bayan (2014-2018, Mongolia), to understand the interand intra-annual changes of WUE by evaporative fraction (EF), as well as the climatic and biotic controls on gross ecosystem production (GEP), evapotranspiration (ET) and partitioned evaporation (T) and transpiration (E). Results showed that the response of annual WUE to EF was positive in Changling meadow with dry atmosphere but insignificant in Bayan with cold climate; the contrasting WUEs were driven by divergent GEP and ET responses to EF in two meadows. Monthly T/ET increased linearly with EF in both meadows, but logarithmically with leaf area index (LAI). Bayan and Changling meadows had a similar instantaneous WUE (WUEp, GEP/T) that were insensitive to EF change. We also found that the frequency of growing season precipitation affected WUE at both sites. We conclude that contrasting GEP responses to EF determined the meadow WUE variations. The magnitude and changes in transpiration and evaporation provide further insights on the biophysical regulations (i.e., LAI) of ecosystem water use and WUEp. This study indicated that differences in ecosystem water yield, soil water status and sensitivities of GEP and ET partitioning jointly contributed to the divergent WUE at the two meadow steppes in this semi-arid region. |
| 关键词 | Evaporative fraction (EF) Evapotranspiration (ET) Gross ecosystem production (GEP) Meadow steppe Water deficit Water use efficiency |
| 学科领域 | Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources |
| DOI | 10.1016/j.jhydrol.2020.125799 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS关键词 | WINTER-WHEAT ; TERRESTRIAL ECOSYSTEMS ; GRASSLAND ECOSYSTEMS ; STOMATAL CONDUCTANCE ; SEMIARID ECOSYSTEMS ; DOMINANT ROLE ; RISING CO2 ; EVAPOTRANSPIRATION ; CARBON ; PATTERNS |
| WOS研究方向 | Science Citation Index Expanded (SCI-EXPANDED) |
| WOS记录号 | WOS:000639853400025 |
| 出版者 | ELSEVIER |
| 文献子类 | Article |
| 出版地 | AMSTERDAM |
| EISSN | 1879-2707 |
| 资助机构 | National Key R&D Program of China [2017YFE0104500, 2017YFA0604801] ; Natural Science Foundation of China [31800512, 31870466] ; China Postdoctoral Science Foundation [2018 M632560, 1313761] ; LCLUC Program of NASA [80NSSC20K0410] ; US-China Carbon Consortium (USCCC) |
| 作者邮箱 | shaochangliang@caas.cn |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ibcas.ac.cn/handle/2S10CLM1/26819 |
| 专题 | 植被与环境变化国家重点实验室 |
| 作者单位 | 1.Shanxi Univ, Sch Life Sci, Taiyuan 030006, Peoples R China 2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China 3.Chinese Acad Agr Sci, Natl Hulunber Grassland Ecosyst Observat & Res St, Beijing 100081, Peoples R China 4.Shanxi Univ, Inst Loess Plateau, Taiyuan 030006, Peoples R China 5.Inner Mongolia Univ, Sch Ecol & Environm, Hohhot 010021, Inner Mongolia, Peoples R China 6.Michigan State Univ, Dept Geog Environm & Spatial Sci, E Lansing, MI 48824 USA 7.Fujian Agr & Forestry Univ, Forestry Coll, Fuzhou 350002, Peoples R China 8.Northeast Normal Univ, Key Lab Vegetat Ecol, Minist Educ, Changchun 130024, Peoples R China 9.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China 10.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Gang,Zhao, Fangyuan,Chen, Jiquan,et al. Divergent forcing of water use efficiency from aridity in two meadows of the Mongolian Plateau[J]. JOURNAL OF HYDROLOGY,2021,593. |
| APA | Dong, Gang.,Zhao, Fangyuan.,Chen, Jiquan.,Qu, Luping.,Jiang, Shicheng.,...&Shao, Changliang.(2021).Divergent forcing of water use efficiency from aridity in two meadows of the Mongolian Plateau.JOURNAL OF HYDROLOGY,593. |
| MLA | Dong, Gang,et al."Divergent forcing of water use efficiency from aridity in two meadows of the Mongolian Plateau".JOURNAL OF HYDROLOGY 593(2021). |
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