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采用面上调查和定点观测相结合的方法，分别对哈尔滨郊区不同连作（轮作）年限的大棚土壤的主要养分含量状况、酶活性、水稳性团粒分级及盐积状况进行研究分析。结果表明，随着连作年限的增加，土壤主要养分含量有增加的趋势，土壤脲酶活性、中性磷酸酶、酸性磷酸酶活性也有增加的趋势；２～０．２５ｍｍ水稳性团粒增加，土壤物理结构性能有所改善；土壤化学性状变劣，出现了盐类积累。
Using the combination of surface survey and fixed observation, the main nutrient contents, enzyme activities, water stable aggregate fractionation and salinization of soils in different continuous cropping (rotation) years in Harbin suburbs were studied. The results showed that with the increase of continuous cropping years, the main nutrient contents of soil tended to increase, and the activities of soil urease, neutral phosphatase and acid phosphatase tended to increase. The water-stable aggregates of 2 ~ 0.25mm increased, Structural properties improved; soil chemistry worsened and salt accumulation occurred.