塿土和黑土不同层次钾运移研究

Study on K^+ Transport of Loess Soil and Black Soil at Different Soil Level

以采自陕西省杨凌区西北农林科技大学农作一站的土娄土和黑龙江省农业科学院土壤肥料研究所试验田的黑土为研究对象,通过饱和稳定流土柱运移实验,测定不同层次土壤钾运移穿透曲线;应用对流、扩散模型,对测试穿透曲线进行拟合,反求其运移参数D、R,结果表明:钾在土娄土和黑土不同层次的运移均受到强烈的阻滞作用。土娄土的阻滞因子与土层的粘粒含量呈显著正相关;黑土对钾运移的阻滞作用是土壤质地、有机质含量、矿物组成等因子综合作用的结果。土娄土和黑土的扩散、弥散系数与平均孔隙水流速均呈极显著的线性关系。

This paper took loess soil from the first farm of Northwest Sci-Tech University of Agriculture and Forestry and black soil from the test fields of soil and fertilizer institute of Helongjiang Academy of Agricultural Sciences as examples, the K^＋ transport Break Through Curve of different soil level was determined with saturated and steady column destruction method. We made simulation with the convection ＆ diffusion model and analyzed the D,R of K ^＋ transport. The result showed that the K^＋transport met the retardation in every level of loess soil and black soil. The retardation factor of loess soil was significantly linearly positively correlated with the content of clay. The retardation function of K^＋transport with black soil were significantly correlated with the soil quality, the content of organic, the mineral component and other factors. The coefficient of diffusion ＆ dispersion was apparently linearly related with the everage pore water velocity.