Evapotranspiration partitioning, stomatal conductance, and components of the water balance: A special case of a desert ecosystem in China

Zhao, Wenzhi, Liu, Bing, Chang, Xuexiang, Yang, Qiyue, Yang, Yuting, Liu, Zhiling, Cleverly, James, and Eamus, Derek (2016) Evapotranspiration partitioning, stomatal conductance, and components of the water balance: A special case of a desert ecosystem in China. Journal of Hydrology, 538. pp. 374-386.

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Abstract

Partitioning evapotranspiration (ET) into its components reveals details of the processes that underlie ecosystem hydrologic budgets and their feedback to the water cycle. We measured rates of actual evapotranspiration (ETa), canopy transpiration (Tc), soil evaporation (Eg), canopy-intercepted precipitation (EI), and patterns of stomatal conductance of the desert shrub Calligonum mongolicum in northern China to determine the water balance of this ecosystem. The ETa was 251 ± 8 mm during the growing period, while EI, Tc, and Eg accounted for 3.2%, 63.9%, and 31.3%, respectively, of total water use (256 ± 4 mm) during the growing period. In this unique ecosystem, groundwater was the main water source for plant transpiration and soil evaporation, Tc and exceeded 60% of the total annual water used by desert plants. ET was not sensitive to air temperature in this unique desert ecosystem. Partitioning ET into its components improves our understanding of the mechanisms that underlie adaptation of desert shrubs, especially the role of stomatal regulation of Tc as a determinant of ecosystem water balance.

Item ID: 73491
Item Type: Article (Research - C1)
ISSN: 0022-1694
Copyright Information: © 2016 Elsevier B.V. All rights reserved.
Date Deposited: 07 Jun 2022 04:33
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4102 Ecological applications > 410203 Ecosystem function @ 50%
37 EARTH SCIENCES > 3707 Hydrology > 370702 Ecohydrology @ 50%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180601 Assessment and management of terrestrial ecosystems @ 100%
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