A multilayer soil water balance model for a wheat field in the Yellow River basin

摘要

Shortage of water resources has become a big concern affecting sustainable crop production for Yellow River basin with its rapid regional development in the last decades. Reasonable investigation and evaluation of! water resources in the Yellow River basin is thus important for the sustainable development of ecological environment. In this study, field investigation, micrometeorological measurement and an efficient groundwater model for the simulation of groundwater fluctuation and water balance was constructed for a wheat field in the Yellow River basin, China. The model is validated by using the daily volumetric soil water content in the root zone which has been divided into two layers; the first layer 30 cm thick, the second layer 70 cm thick. Micrometeorological conditions in the wheat field were measured to evaluate the radiation balance and energy balance in the field from 5 May to 27 July 2005. Daily ET was estimated by Bowen Ratio Energy Balance method (ET_B) by integrating hourly ET. Agreeable results showed the applicability of the proposed multilayer groundwater evaluation model for the wheat field in the Yellow River basin.