大棚蔬菜连作年限对土壤主要理化性状的影响

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。

Effect of Continuous Vegetable Cropping in Plastic Greenhouse on the Soil Physicochemical Properties

The main nutrition contents,enzymie activities,qualification of aquaous steady globs and salt accumulation in continuous cropping plastic greenhouse were investigaled. Results showed that the amount of main soil nutrients,the activities of soil urease,nutral phosphatase,acid phosphatase and 2～0.25mm aquaous steady globs increased,and the soil property of physical structure was improved. However,the chemical property of soil became worse and the salt was accumulated. 