土壤磷扩散的影响因素研究

对3种不同质地土壤磷扩散特征以及影响因素进行了试验研究。结果表明,随着土壤含水率的增加,土壤磷的扩散系数明显增加,土壤磷的扩散系数与土壤含水率的关系呈显著的幂函数相关;随土壤质地加重,土壤磷扩散系数增大;温度升高,土壤磷扩散系数增大,土壤磷扩散系数的温度效应可用磷扩散系数的温度系数定量表示;随着土壤施磷量的增大,土壤的磷扩散系数明显增加;土壤容重对磷扩散的影响与土壤的质地有关。对于质地较重的土壤,随着土壤容重的增加,磷扩散系数有降低的趋势;而对于质地轻的沙土,磷扩散系数有增加的趋势。

Research on Impact Factors of Phosphorus Diffusion in Soil

Soil phosphate diffusion characteristics and impacting factors are investigated by 32P trace method of different soil texture. Results show as follows : the soil P diffusion coefficient increases markedly with the increase of soil water content, their relation being described by the correlation of the exponential; the soil P diffusion coefficient increases with the increases of soil clay content; the coefficient also increases with the increase of temperature, with the temperature effect on the soil P diffusion coefficient being described by the temperature coefficients of the P diffusion coefficient; the soil P diffusion coefficient increases markedly with the increase of P application quantity in soil; the effect of soil volume weight on the P diffusion coefficient is in relation to soil texture, such that for fine-texture soil, there is an increasing trend in the P diffusion coefficient with decreasing soil volume weight, and for light-texture soil, there is an increasing trend in the P diffusion coefficient with the increasing of soil volume weight.