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。
The corrosion of steel bar and the alternative freezing and thawing of concrete are the important effects on the durability of RC structures.
钢筋锈蚀和混凝土冻融循环是影响钢筋混凝土结构耐久性的重要因素。
The experiments results show that the effect of alternative freezing and thawing has a great influence on the organic matter, nitrogen nutrition, potassium nutrition and soil enzyme activities.
研究结果表明,冻融交替作用对黑土有机质、氮钾及酶活性产生重要的影响。