Modelling water uptake by various root systems in a clay loam soil under a high transpiration demand

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Tan, M.^1 ; Hu, Z.^2 ; Yu, Y.^1 ; Zhang, K.^3

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou

310058, China^1

Design and Research Institute of Environmental Protection Sciences of Zhejiang Province, Hangzhou

310007, China^2

Ningbo Institute of Technology, Zhejiang University, Ningbo

315100, China^3

关键词: Agricultural water management;    Clay loam soils;    Crop transpirations;    Extracting water;    Hydrological models;    Root distribution;    Rooting depths;    Soil profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012060/pdf
DOI  :  10.1088/1755-1315/81/1/012060

来源: IOP

【 摘 要 】

Hydrological models are increasingly becoming important tools in agricultural water management. In this study, the effect of root length distribution on water uptake in a clay loam soil, a key process in agricultural hydrological models, is numerically investigated under a high transpiration demand. Four different root distributions (uniform, linear and exponential) are employed in the simulations. Results shown that roots distributed more evenly in the soil profile have an overall greater capacity and a smaller ability at later stages of transpiration of extracting water from the soil. Soil water 10 cm below the rooting depth has a very limited impact on crop transpiration.