Abstract
The transformation process of soil water plays an important role in the hydrological cycle, and is a link to other water processes. Study on the regularity of soil water transformation under agricultural plantation is favorable to understanding the influence of human activities on soil water conversion. Typical crop was selected in Beijing-Tianjin-Hebei(BTH) region and the study on regularity of field-scale soil water transformation was carried out by means of crop-soil water field experimental observation combined with model simulation. In the field experiment, testing and observation of irrigated and rainfed maize were simultaneously carried out in the adjacent fields respectively to form a comparative experimental study. The experimental observation data were used to establish the soil water model, which is calibrated in many aspects, such as field water content change during the maize growth period, the soil profile water content distribution at different moments, maize leaf area index and plant height. The results show that this model has an efficient simulation effect. Quantitative study on field evapotranspiration regularity, field soil water flux under irrigated and rainfed modes, impact mechanism of soil water deep seepage during maize growth period was achieved through the simulation of soil water process, and related reference conclusions were also proposed for water resources management and conservation in BTH.
Highlights
In the watershed/regional hydrological cycle system, the soil water transformation plays an important role as a link between rainfall, surface water processes and groundwater processes[1,2]
The soil water flux accounts for a large proportion of the total hydrological cycle flux, especially in plain regions where over 70% of the precipitation is converted to soil water first[3]; second, soil water is the main water source for direct utilization of natural vegetation and crops, which plays an irreplaceable role in the maintenance of ecological stability and agricultural production[4,5,6]; third, which is the most important is that, soil is the key place of all kinds of hydrological conversion processes, because the results of cyclical conversion of water in soil will directly affect the surface runoff, groundwater recharge, water consumption and other indicators of regional water resources characteristics[6]
In order to reveal the basic regularity of soil water transformation, we carried out field experiments and model simulation for a typical crop in BTH region
Summary
In the watershed/regional hydrological cycle system, the soil water transformation plays an important role as a link between rainfall, surface water processes and groundwater processes[1,2]. The study of soil water processes and transformation is an important part in researching on the hydrological cycle. Indoor and outdoor experiments are the basic ways to study soil water and play an important role in revealing the movement and conversion rules of soil water[7,8,9,10,11,12,13]. In order to reveal the basic regularity of soil water transformation, we carried out field experiments and model simulation for a typical crop in BTH region
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