封丘地区土壤水分扩散率的研究

本文研究了河南封丘地区代表性土壤的水分扩散率,结果表明:封丘地区3个土壤亚类的水分扩散率变化于1. 0×10-3 ~1. 5×10cm2 min-1之间;土壤水分扩散率存在着空间上的变异性,随土壤剖面深度增加而呈现出表土层高、中间土层低、底土层又升高的趋势;各土层土壤水分扩散率与土壤含水量呈指数函数变化关系,经统计分析均达到极显著水平;土壤容重、孔隙度及孔隙类型、土壤有机质含量和土壤粘粒含量均对土壤水分扩散率有不同程度的影响,而土壤全盐含量对其影响不大。

Soil Moisture Diffusivity in Fengqu Region

The soil moisture diffusivity of the three kinds of soils in Fengqu region was studied. The results were as follows. Firstly, the soil moisture diffusivity in the three kinds of soils were changeable from 1.0×10~(-3) to 1.5×10~1 (cm~2·min~(-1)) and increased with the depth in soil profiles. There was spatial variability in soil moisture diffusivity, and the high soil moisture diffusivity occurred in topsoil layers while the low in middle soil layers. Secondly, relationship between soil moisture diffusivities and soil water content in every soil layer were sharp positive exponential function, and these relationships were significant by statistical analysis. Thirdly,the bulk density, porosity, the type of pore, organic matter and clay contents in the soil affected the soil moisture diffusivity,while total salt content wasn't a main effect factor.