三峡库区紫色土土壤水分入渗特性研究

Soil Infiltration Characteristics of Purple Soil in Three Gorges Reservoir Area

利用室内环刀法对三峡库区紫色土土壤水分入渗特性进行了研究。结果表明,不同土地利用类型土壤稳定入渗率位于为0.0075~1.73 mm/min之间,大小依次为竹林地〉榨菜地〉柑桔地〉荒草地;Horton入渗方程在紫色土不同土地利用类型上拟合的结果在α=0.01上达到了显著水平,可以作为表达三峡库区紫色土土壤水分入渗过程的模型。土壤稳定入渗率与土壤理化性质间存在一定相关关系,其中土壤稳定入渗率与砂粒含量之间呈幂函数关系,与容重呈指数函数关系,与非毛管孔隙度呈幂函数关系,与大于0.25 mm的水稳性团聚体含量之间呈指数函数关系。多元对数线性回归模型可作为紫色土土壤水分入渗特性参数预报模型。

Method of single-ring was employed to study soil water infiltration characteristics of Purple soil in Three Gorges reservoir area.The results showed that the soil stability infiltration rate of different land utilization types are from 0.0075~1.73 mm/min,and the order of bamboo forest land,preserved szechuan pickle land,citrus land,grassland;The simulating result of Horton infiltration equation in different land utilization types of Purple soil has reached a significant level results at α is 0.01,Horton infiltration equation can be expressed as soil water infiltration model of Purple soil in Three Gorges reservoir area.It has correlation between soil stability infiltration rate and soil physic-chemical properties,a power function between soil stability infiltration rate and sand,a exponentially function between soil stability infiltration rate and bulk gravity,a power function between soil stability infiltration rate and non-capillary porosity,a exponentially function between soil stability infiltration rate and content of water stable aggregate larger than 0.25 mm.Multiple log-linear regression model can be used as forecasting model of soil water infiltration characteristics parameters in purple soil.