论文部分内容阅读
非饱和土壤在施磷量0—400mg／kg下的磷自扩散系数（Da）随施磷量近线性增加，但增加的幅度以缓冲性能小的轻质土壤最高。不同土壤磷扩散受土壤水分、施磷量和温度等因素相互作用的影响程度不同，为表征这种差异利用其多元非线性拟合方程的偏微分，本文提出了磷扩散率的水分系数、肥料系数和温度系数等概念。在相同条件下，这些系数均呈现为黄绵土＞黑垆土＞土＞黄褐土，说明水肥温对磷扩散的影响程度与质地密切相关。
The phosphorus self-diffusion coefficient (Da) in unsaturated soils increased nearly linearly with the amount of phosphorus applied at 0-400 mg / kg phosphorus application, but the increasing range was the highest in light soil with small buffer capacity. In order to characterize this difference, we used the partial differential of the nonlinear non-linear fitting equation. In this paper, we proposed the water coefficient of phosphorus diffusivity, the ratio of fertilizers Coefficient and temperature coefficient and other concepts. Under the same conditions, these coefficients all showed as loamy soil> blackhead soil> loamy> yellowish brown soil, indicating that the influence degree of water and fertilizer temperature on phosphorus diffusion is closely related to the texture.