In order to study the effect of the soil freezing point on the calculation of frozen wall thickness, some models of the artificial ground freezing temperature field were established.
为了研究土层冻结温度对冻结壁厚度计算的影响，构建了考虑土层实际冻结温度的人工冻结温度场模型。
The above results show that, the effect of alternative freezing and thawing has a great influence on the soil organic matter, soil nitrogen, soil potassium and some soil enzymes.
上述研究结果说明，冻融交替作用对黑土土壤有机质、氮钾和酶活性产生重要影响。
The effect of alternative freezing and thawing can enhances the activities of some soil enzymes greatly, such as phosphatase, nitrate reductase and nitrite reductase.
冻融交替作用明显地增强土壤中磷酸酶、硝酸还原酶和亚硝酸还原酶的活性。
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