Cropland evapotranspiration, shelter forest transpiration and the determining factors in the middle Heihe River Basin, China

doi:10.13287/j.1001-9332.202509.023

Abstract

Abstract: Cropland and shelter forest are the most important landscape types of oasis ecosystems in arid regions, and water consumption within which is a major way to utilize oasis water resource. Taking cropland and shelter forest in the middle Heihe River Basin as the research objects, we measured the evapotranspiration (ET) of croplands by the eddy covariance method and the transpiration (T) of shelter forests by trunk sap flow method. By combining meteorological and hydrological data from field monitoring with remote sensing vegetation indices, we analyzed the variations and influencing factors of ET and T. The results showed that, during the growing season from April to October in 2024, the daily ET of croplands was 1.38 mm·d^-1, with a total of 268.3 mm, peaking in July. Daily T of shelter forest was 1.93 mm·d^-1. The annual T was 392.7 mm, peaking in August. The determining factors of cropland evapotranspiration and shelter forest transpiration showed obvious difference. The interaction of meteorological-vegetation factors (including solar radiation, wind speed and leaf area index) and moisture factors (including precipitation, soil water content at 15 and 30 cm depths) accounted for 77% variation of cropland evapotranspiration. Meteorological-vegetation factors (including air temperature, relative humidity, solar radiation, vapor pressure deficit and normalized differential vegetation index) independently explained 69% variation of shelterbelt forest transpiration, whereas moisture factors had a lower explanatory rate for variation of shelter forest transpiration. One possible explanation was that water sources were different for cropland and shelter forest.

Key words: evapotranspiration, transpiration, eddy covariance method, shelter forest, maize cropland, Heihe River Basin

YU Tengfei, HAN Tuo, XI Haiyang, WU Longqing, CHENG Wenju, FENG Qi. Cropland evapotranspiration, shelter forest transpiration and the determining factors in the middle Heihe River Basin, China[J]. Chinese Journal of Applied Ecology, 2025, 36(9): 2815-2826.

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