Temporal partitioning of water between plants and hillslope flow in a subtropical climate

doi:10.1016/j.catena.2018.01.031

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Temporal partitioning of water between plants and hillslope flow in a subtropical climate
	Zhao, Pei1,2,4 ; Tang, Xiangyu2 ; Zhao, Peng 3; Tang, Jialiang2
刊名	CATENA
	2018-06-01
卷号	165 页码:133-144
关键词	Ecohydrological separation Mixing processes Plant water source Stable isotopes
ISSN号	0341-8162
DOI	10.1016/j.catena.2018.01.031
英文摘要	Recent work has suggested that ecohydrological separation may exist between the water sources for recharge and plant water uptake. However, the temporal partitioning of plant transpiration and hillslope flow is still poorly understood. In a growing season, the stable isotopes of precipitation, soil water, groundwater, plant water and hillslope flow in a subtropical climate in Southwest China were determined to assess the compartmentalization of vegetation water use and flow generation. The results suggest that the hillslope flow and plant water have different isotopic characteristics in most cases. The lc-excess values of plants significantly differed from those of the hillslope flow. These different isotopic signatures for plants and the hillslope flow were associated with the different proportions of various water sources in each water pool. Precipitation, the hillslope flow and soil water plot approximately along the local meteoric water line (LMWL), and the studied plant xylem waters plot partly below the LMWL, supporting ecohydrological separation. In this subtropical climate with seasonal droughts, the hydrological separation is temporal and does not occur during the wet season due to the increase in hydrological connectivity. On dry days, the various water sources poorly mix in the subsurface. Thus, the ecohydrological separation between the plant water and hillslope flow water sources varies depending on the rooting depth of plant species and moisture conditions. The implications underlying these findings will be helpful for constructing a process-based ecohydrological model and for understanding the mechanisms underlying the hydrologic interactions between plants and subsurface water flow.
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000430994900014
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/21485]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Tang, Xiangyu
作者单位	1.Shangluo Univ, Coll Urban Rural Planning & Architectural Engn, Shangluo 726000, Peoples R China 2.Chinese Acad Sci, Key Lab Mt Surface Proc & Ecol Regulat, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China 3.Sichuan Agr Univ, Coll Forestry, Chengdu 611130, Sichuan, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Pei,Tang, Xiangyu,Zhao, Peng,et al. Temporal partitioning of water between plants and hillslope flow in a subtropical climate[J]. CATENA,2018,165:133-144.
APA	Zhao, Pei,Tang, Xiangyu,Zhao, Peng,&Tang, Jialiang.(2018).Temporal partitioning of water between plants and hillslope flow in a subtropical climate.CATENA,165,133-144.
MLA	Zhao, Pei,et al."Temporal partitioning of water between plants and hillslope flow in a subtropical climate".CATENA 165(2018):133-144.