In order to study the effectof the soilfreezing 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。
2
The above results show that, the effectof 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。
3
The effectof alternative freezing and thawing can enhances the activities of some soil enzymes greatly, such as phosphatase, nitrate reductase and nitrite reductase.