Mr. Silong Chen Profile

Silong Chen

at Ctr Ag Resources Res Inst of Genetics & Dev Bio

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Proceedings Article | 27 September 2006 Paper

Simulation of soil evaporation under different ground coverage with semi-empirical models

Suying Chen, Xiying Zhang, Silong Chen, Pei Dong, Hongyong Sun

Proceedings Volume 6298, 62982K (2006) https://doi.org/10.1117/12.682846

KEYWORDS: Soil science, Aerodynamics, Chromium, Silicon, Data modeling, Climatology, Mass attenuation coefficient, Resistance, Capillaries, Wind energy

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Minimizing soil evaporation is a key element in improving water use efficiency in dry areas. Experiments were conducted in the winter wheat field during 2004-2005 to compare effects of different row spacing on soil evaporation. A model to estimate soil evaporation was developed based on the experimental data. The reference crop evapotranspiration (ET₀) was estimated by the Penman-Montieth equation, and the factors affecting evaporation under crop canopy were divided into both the radiation item (ET_s1) and the aerodynamics item (ET_s2) according to the degree of crop canopy coverage (f_c). The simulation equation for actual evaporation, combining with soil moisture parameter, was established in this paper. In this study, a light meter was utilized to measure f_c, which replaced leaf are index (LAI) in evaporation estimation. In comparison with the measured evaporation by micro-lysimeters (ML) in four row spacing: 7.5 cm, 15 cm, 22.5 cm and 30 cm, tested in a randomized block design, the simulated daily evaporation had root mean square errors (RMSE) of 0.22 mm, 0.24 mm, 0.25 mm 0.26 mm and a bias of 0.01 mm, 0.02 mm, -0.08 mm, -0.03 mm respectively. Results showed that using canopy coverage factor to replace leaf area index could effectively estimate soil evaporation.

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