干旱区生态环境知识资源中心(Arid): Seasonality of the Transpiration Fraction and Its Controls Across Typical Ecosystems Within the Heihe River Basin

Arid

DOI	10.1029/2018JD029680
	Seasonality of the Transpiration Fraction and Its Controls Across Typical Ecosystems Within the Heihe River Basin
	Tong, Yaqin 1; Wang, Pei 1; Li, Xiao-Yan 1; Wang, Lixin 2; Wu, Xiuchen 1; Shi, Fangzhong 1; Bai, Yan 1; Li, Engui 1; Wang, Jiaqi 1; Wang, Yang 1
通讯作者	Wang, Pei ; Li, Xiao-Yan
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN	2169-897X
EISSN	2169-8996
出版年	2019
卷号	124 期号:3 页码:1277-1291
英文摘要	Understanding the seasonality of the transpiration fraction (T/ET) of total terrestrial evapotranspiration (ET) is vital for coupling ecological and hydrological systems and quantifying the heterogeneity among various ecosystems. In this study, a two-source model was used to estimate T/ET in five ecosystems over the Heihe River Basin. In situ measurements of daily energy flux, sap flow, and surface soil temperature were compared with model outputs for 2014 and 2015. Agreement between model predictions and observations demonstrates good performance in capturing the ecosystem seasonality of T/ET. In addition, sensitivity analysis indicated that the model is insensitive to errors in measured input variables and parameters. T/ET among the five sites showed only slight interannual fluctuations while exhibited significant seasonality. All the ecosystems presented a single-peak trend, reaching the maximum value in July and fluctuating day to day. During the growing season, average T/ET was the highest for the cropland ecosystem (0.800.13), followed by the alpine meadow ecosystem (0.790.12), the desert riparian forest Populus euphratica (0.670.07), the Tamarix ramosissimaLedeb desert riparian shrub ecosystem (0.670.06), and the alpine swamp meadow (0.550.23). Leaf area index exerted a first-order control on T/ET and showed divergence among the five ecosystems because of different vegetation dynamics and environmental conditions (e.g., water availability or vapor pressure deficits). This study quantified transpiration fraction across diverse ecosystems within the same water basin and emphasized the biotic controls on the seasonality of the transpiration fraction. Plain Language Summary The management of water resources in Heihe River Basin requires accurate predictions of water yield. At present, the response of the ecosystem of this river basin to regional climate change is faced with many uncertainties. Transpiration fraction (T/ET) is an important index to measure different vegetation feedback on climate change. Quantifying the differences of T/ET across typical ecosystems within Heihe River Basin is of great scientific and practical significance for the sustainability development in the future.
英文关键词	transpiration fraction two-source model Arid Inland Heihe River Basin seasonality sensitivity analysis typical ecosystems
类型	Article
语种	英语
国家	Peoples R China ; USA
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000459377000007
WOS关键词	WATER-USE EFFICIENCY ; PARTITIONING EVAPOTRANSPIRATION ; VEGETATION GROWTH ; EDDY-COVARIANCE ; MODEL ; BALANCE ; FLUXES ; VAPOR ; ASSIMILATION ; CONDUCTANCE
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217057
作者单位	1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing, Peoples R China; 2.Indiana Univ Purdue Univ Indianapolis, Dept Earth Sci, Indianapolis, IN USA
推荐引用方式 GB/T 7714	Tong, Yaqin,Wang, Pei,Li, Xiao-Yan,et al. Seasonality of the Transpiration Fraction and Its Controls Across Typical Ecosystems Within the Heihe River Basin[J]. 北京师范大学,2019,124(3):1277-1291.
APA	Tong, Yaqin.,Wang, Pei.,Li, Xiao-Yan.,Wang, Lixin.,Wu, Xiuchen.,...&Wang, Yang.(2019).Seasonality of the Transpiration Fraction and Its Controls Across Typical Ecosystems Within the Heihe River Basin.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(3),1277-1291.
MLA	Tong, Yaqin,et al."Seasonality of the Transpiration Fraction and Its Controls Across Typical Ecosystems Within the Heihe River Basin".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.3(2019):1277-1291.