Application of two-layer soil calculation model on risk assessment for agricultural drought

摘要

On the basis of discussing the current assessment models on agricultural drought, the calculation model of water movement on the two-layer soil is made with the theory "soil-plant-atmosphere continuum" in the paper, and the variation on crop's ET can be described in it. Furthermore, considering the relationship between the crop's drought degree and the yield loss, static and dynamic calculation models of risk assessment on agricultural drought are established, which are based on the crop water production function, and considered comprehensively all kinds of crops' weight. And the experiment indicates that these models, compared with traditional models, are not only true for risk assessment on the drought degree in different time scales in the future, but also can provide information of production loss. As a result, both of them are worthy to be popularized in the future.