京郊平原区粮田深层土壤水分的预测

Study on Prediction of Soil Water in Deeper Layers at Plain Area of Suburban Beijing

通过对北京市通州区徐辛庄镇粮田土壤剖面土壤水分的研究 ,得到了京郊平原区粮田的土壤水分垂直变异特征———各层间的变异表现出明显的层次性 ;土壤水分随深度的变化呈曲线的形式 ,但是随表层土壤水分的减少 ,其随着深度的变化近乎于直线。在研究土壤水分垂直规律的基础上对不同土层的土壤水分进行了模拟预测 ,三个层次的预测平均误差均小于 10 % ,其中以 0～ 60cm土层的预测结果最好 ;在这些预测之中相对误差小于 10 %的均占 80 %左右 ,相对误差小于 5 %的占 5 0 %以上 。

In this paper, we got the vertical variable patterns of soil water of fields in suburban Beijing. Soil water is different significantly in different layers, it changes with the depth nonlinearly, but the relation between it and the depth is nearly linear as the content of soil water decreases. Basing on the research of the vertical regularity of soil water, this paper predicts the soil water of different soil layers. The average accuracy of soil water of three deeper layers is less than 10%, the prediction result of 0~60 cm layer is the best. So the results of the study can support the decision of managing soil water effectively and controlling it dynamically.