河南省不同土壤类型墒情变化规律

分析河南省台站土壤墒情数据库1997年10月至2003年6月资料，找出不同土壤类型的墒情变化规律。土壤有效水分含量分析表明：壤土最大，粘土次之，沙土最小；土壤墒情受地下水影响较大，地下水位较浅的地区不容易出现干旱。根据土壤墒情资料确定了土壤墒情订正系数和不同土壤类型田间持水量在全省的分布，并将其应用到墒情预报模型中。

Variation Regularities of Soil Water in Vari-Type Soils in Henan Province

An analysis was made of the soil water data from the Henan Provincial soil water database from July 1997 to June 2003, and the variation regularities of soils water for various types of soils are discussed. The results show that the available soil water is the greatest for loam, the second for clay and the least for sandy soil. The soil water is influenced by underground water greatly. The areas with lower underground water level are less attacked by droughts. Based on the soil water data, the correction coefficients of soil water and the distributions of field capacities for various types of soils over Henan Province were determined, which were used a the forecast model of soil water.