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。
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.
冻融交替明显增加土壤中水溶性有机质的含量。
It enhances the content of water soluble organic matter greatly.
上述研究表明，冻融交替对高寒草甸土壤氮素有显著影响。
The study showed that freezing and thawing alternation had a significant influence on soil nitrogen pool in the alpine meadow.
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 effect of alternative freezing and thawing can enhances the activities of some soil enzymes greatly, such as phosphatase, nitrate reductase and nitrite reductase.
冻融交替显著地增加土壤中铵态氮的含量。
The effect of alternative freezing and thawing enhances the content of ammonium nitrogen greatly.
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 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.
认为土壤胀缩运动主要决定于土壤粘粒的含量，同时季节性冻融作用与干湿交替作用是导致土壤胀缩运动的直接因素。
Moreover, seasonal freezing and melting and seasonal drying and wetting are the direct factors causing soil to expand and contract.
恶劣环境条件(如剧烈的冻融交替)的影响以及对恶劣条件适应被认为是分布格局及种间联结性发生变化的主要原因。
Adverse circumstances such as intense freeze-thaw alternation were considered as primary factors resulting in changes of population distribution pattern and interspecific association.
恶劣环境条件(如剧烈的冻融交替)的影响以及对恶劣条件适应被认为是分布格局及种间联结性发生变化的主要原因。
Adverse circumstances such as intense freeze-thaw alternation were considered as primary factors resulting in changes of population distribution pattern and interspecific association.
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