DOI: 10.1007/s11629-019-5687-1
论文题名: Exploring the influence of environmental factors in partitioning evapotranspiration along an elevation gradient on Mount Gongga, eastern edge of the Qinghai-Tibet Platea, China
作者: Sun J.-Y. ; Sun X.-Y. ; Hu Z.-Y. ; Wang G.-X.
刊名: Journal of Mountain Science
ISSN: 16726316
出版年: 2020
卷: 17, 期: 2 语种: 英语
英文关键词: Eddy covariance
; Evapotranspiration components
; Radiation
; Water use efficiency
Scopus关键词: eddy covariance
; electromagnetic radiation
; elevation
; environmental factor
; evapotranspiration
; partitioning
; water use efficiency
; China
; Gongga Mountain
; Qinghai-Xizang Plateau
; Sichuan
英文摘要: Evapotranspiration (ET) is a crucial part of the global hydrological cycle, and quantifying ET components is significant for understanding the global water cycle and energy balance. However, there is no consensus on the value of ET components, especially in topographic abrupt change zone, such as eastern margin of the Qinghai-Tibet Platea, where values of ET changes along the altitudinal gradients. Our aim is to explore the influencing factors in partitioning evapotranspiration and how ET components change with increasing elevations. A novel approach was proposed to estimate ET components by adding net solar radiation (Rn) instead of the vapor pressure deficit (VPD) into the underlying water use efficiency (uWUE) model based on one-year continuous measurements of flux data along the elevation gradient on Mount Gongga. Correlation analysis shows that the uWUE model’s performance can be improved significantly by considering Rn instead of VPD, with correlation coefficients increasing by 35%–64%. The ratios of transpiration (T) to ET (T/ET) were 0.47, 0.48, 0.50 and 0.35 for the deciduous broadleaf forest (BF), mixed coniferous and deciduous broadleaf forest (MF), evergreen needle forest (ENF) and shrub land (SL), respectively. Leaf area index (LAI) and air temperature (Ta) were the two main controlling factors in determining T/ET during the growing season and at an annual scale, while Rn and Ta played more important roles during the dormant season. This study highlights the importance of incorporating Rn in partitioning evapotranspiration by using the water use efficiency (WUE) method in a humid mountainous region, which can improve the estimation of T/ET on a global scale. © 2020, Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159824
Appears in Collections: 气候变化与战略
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作者单位: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China; University of Chinese Academy of Sciences, Beijing, 100049, China
Recommended Citation:
Sun J.-Y.,Sun X.-Y.,Hu Z.-Y.,et al. Exploring the influence of environmental factors in partitioning evapotranspiration along an elevation gradient on Mount Gongga, eastern edge of the Qinghai-Tibet Platea, China[J]. Journal of Mountain Science,2020-01-01,17(2)