Prediction of Regional Soil Water and Drought

A distributive model of soil water balance is developed,which introduces 2-D Cartesian coordinates(x, y)into general soil water balance equation.Thus the dynamic distribution of regional soil water can be predicted.The model has been implemented by using GIS(geographic information system)techniques.Furthermore,the maps of regional soil drought are obtained based on the modcl and the needs of crops on soil water.The method has been applied to the Quzhou,Experimental Area in the Huang-Huai-Hai Plain of China.