Spatial patterns and environmental drivers of evapotranspiration across the Chinese Grassland Transect
文献类型：期刊论文
| 作者 | Ma, Lexin1,2; Chen, Zhi1,2,3; Hao, Tianxiang1; Yang, Meng1; Lin, Quanhong1,2; Zhang, Weikang5; Han, Lang(); Liu, Zhaogang1,2; Sun, Mingyu(); Lin, Yong1,2 |
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2026-03-01 |
| 卷号 | 667页码:134920 |
| 关键词 | Eddy covariance Evapotranspiration Moisture gradient Adaptation mechanisms |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2026.134920 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Alpine grasslands (AG) exhibit significantly higher Humidity Index (HI) than temperate grasslands (TG), leading to a marked moisture gradient variation along the Chinese Grassland Transect (CGT). Over the past few decades, numerous eddy covariance sites have provided valuable insights into evapotranspiration (ET) dynamics at the site scale. However, the spatial patterns of ET and it dominate factors along the moisture gradient across the CGT remain poorly understood. This study integrates observational data from 48 eddy covariance sites (2003---2020) and remote sensing products to analyze the spatial distribution of ET and its driving mechanisms along the CGT. The observational results showed that the mean annual ET in AG (454 f 119 mm) was significantly higher than that in TG (320 f 115 mm), which was consistent with their respective HI. The decoupling coefficient (Omega) increased with ecosystem wetness, being significantly higher in AG (0.41 f 0.11) than in TG (0.23 f 0.10). This suggests that in arid regions, the vapor pressure deficit (VPD) may have a stronger influence on ET than net radiation. As ecosystem moisture gradient change, grasslands have evolved different adaptation mechanisms. Compared to TG, AG exhibited higher canopy conductance and greater sensitivity to changes in VPD. However, the sensitivity of the ratio of transpiration to ET to canopy conductance was lower in AG than in TG. This may reflect a more sensitive water conserving response in TG, where stomatal closure leads to a stronger reduction in transpiration, thus minimizing water loss under arid conditions. This study investigates the spatial variability of ET across the CGT and its environmental controls, providing insights into grassland ecosystem responses to future climate change. |
| URL标识 | 查看原文 |
| WOS关键词 | PARTITIONING EVAPOTRANSPIRATION ; BIOPHYSICAL CONTROLS ; ENERGY-EXCHANGE ; WATER-BALANCE ; ECOSYSTEM ; CARBON ; EVAPORATION ; DESERT ; FLUXES ; TRANSPIRATION |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:001669665600001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/220977]  |
| 专题 | 生态系统网络观测与模拟院重点实验室_外文论文 |
| 通讯作者 | Chen, Zhi |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China; 2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China; 3.Univ Chinese Acad Sci, Beijing Yanshan Earth Crit Zone Natl Res Stn, Beijing 101408, Peoples R China; 4.Shenyang Agr Univ, Coll Agron, Shenyang 100161, Peoples R China; 5.Minist Emergency Management China, Natl Inst Nat Hazards, Beijing 100085, Peoples R China; 6.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China; 7.Shanxi Univ, Sch Life Sci, Taiyuan 030006, Peoples R China; 8.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; 9.Northeast Normal Univ, Sch Life Sci, Changchun 130024, Peoples R China; 10.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Remote Sensing Gansu Prov, Heihe Remote Sensing Expt Res Stn, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, Lexin,Chen, Zhi,Hao, Tianxiang,et al. Spatial patterns and environmental drivers of evapotranspiration across the Chinese Grassland Transect[J]. JOURNAL OF HYDROLOGY,2026,667:134920. |
| APA | Ma, Lexin.,Chen, Zhi.,Hao, Tianxiang.,Yang, Meng.,Lin, Quanhong.,...&Yu, Guirui.(2026).Spatial patterns and environmental drivers of evapotranspiration across the Chinese Grassland Transect.JOURNAL OF HYDROLOGY,667,134920. |
| MLA | Ma, Lexin,et al."Spatial patterns and environmental drivers of evapotranspiration across the Chinese Grassland Transect".JOURNAL OF HYDROLOGY 667(2026):134920. |
入库方式： OAI收割
来源：地理科学与资源研究所
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