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Biophysical Controls on Water Use Efficiency of Six Plantations Under Different Sky Conditions by Peirong Liu; Xiaojuan Tong; Ping Meng; Jinsong Zhang; Jun Li; Jingru Zhang; Yu Zhou is a Environmental Science article available to read on EtoBox.

What is Biophysical Controls on Water Use Efficiency of Six Plantations Under Different Sky Conditions about?

Ecosystem water use efficiency (WUE) is an indicator characterizing carbon-water coupling of the terrestrial ecosystems. The increasing diffuse radiation enhances carbon assimilation. However, the impact of diffuse radiation interacting with biophysical factors on WUE is still not well-understood. Based on carbon and water vapor fluxes measured by the eddy covariance systems during 2019-2020, we explored the effects of biophysical factors on WUE under different sky conditions at 6 plantation ecosystems (2 deciduous broad-leaved and 4 coniferous plantations) in eastern China. WUE on cloudy days was 4.5-21.5% higher than that on clear days at 6 sites, which was attributed to the increase in ecosystem carbon gain and reduction in water loss. Diffuse fraction (DF) exerted significantly positive direct effects on WUE at JZ, MQ, JY and SHB sites (p < 0.05), with the path coefficients of 0.30-0.58. However, it had positive indirect effects on WUE at HS 1 and HS 2 sites by altering photosynthetically active radiation (PAR), vapor pressure deficit (VPD) and canopy conductance (g c ). WUE was primarily regulated by VPD and g c , and the path coefficients of the direct effect were -0.34--0.73

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Author

Peirong Liu; Xiaojuan Tong; Ping Meng; Jinsong Zhang; Jun Li; Jingru Zhang; Yu Zhou

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)