Spatial variability and temporal stability of actual evapotranspiration on a hillslope of the Chinese Loess Plateau

ZHANG Yongkun ¹HUANG Mingbin²

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作者信息

1. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China
2. Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University, Yangling 712100, China
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Abstract

Actual evapotranspiration (ETa) is a key component of water balance. This study aimed to investigate the spatial variability and time stability of ETa along a hillslope and to analyze the key factors that control the spatiotemporal variability of ETa. The potential evaporation, surface runoff and 0–480 cm soil water profile were measured along a 243 m long transect on a hillslope of the Loess Plateau during the normal (2015) and wet (2016) water years. ETa was calculated using water balance equation. Results indicated that increasing precipitation during the wet water year did not alter the spatial pattern of ETa along the hillslope; time stability analysis showed that a location with high time stability of ETa could be used to estimate the mean ETa of the hillslope. Time stability of ETa was positively correlated with elevation (P<0.05), indicating that, on a hillslope in a semi-arid area, elevation was the primary factor influencing the time stability of ETa.

Key words

relative difference/water balance/surface runoff/soil texture/semi-arid areas

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基金项目

This research was financially supported by the Programme of Introducing Talents of Discipline to Universities of China(D18013)

independent subject of State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, China(2019-ZZ-05)

Project of Qinghai Science & Technology Department(2019-ZJ-Y01)

Natural Science Foundation of Qinghai Province, China(2020-ZJ-967Q)

Thousand High Innovative Talents Program of Qinghai Province(2019)

Program for Changjiang Scholars and Innovative Research Team in University, Ministry of Education, China(IRT_17R62)

staff of Shenmu Erosion and Environment Station of the Institute of Soil and Water Conservation, Chinese Academy of Sciences()

出版年

2021

干旱区科学

中国科学院新疆生态与地理研究所,科学出版社

干旱区科学

CSTPCDCSCDSCI

影响因子：1.743

ISSN：1674-6767

被引量1

参考文献量3

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