土娄土、黑垆土脲酶活性与时间及土壤缓冲量之间的关系为二元线性回归方程。

The equation among Lou soil and Heilu soil urease activity and time and their buffering values is quadratic linear regression equation.

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同时，还着重分析了重壤带的土娄土在不同肥力水平下其物理性质的变化规律。

In the mean time, we also analysed changing laws of Lou soil? S physical properties in heavy loam soil region under different fertility level.

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