Abstract: [Objective and Method]The studies were carried out on the effects of 5, 10, 15 and 20 years continuous cropping cotton soil on the microbial quantities, activities and enzyme activities in Xinjiang.[Result]The results showed that continuous cotton cropping has great effect on the number of its soil microbes and soil enzyme activities. With increasing year of cropping, the amount of bacteria, actinomycetes and fungi had a slight decrease. The amount of bacteria in the soil microorganisms proves to have the absolute superiority over actinomycosis and fungi. With increasing year of cropping, the B/F had a slight decrease. [Conclusion]The soil urease, phosphatase,invertase of cotton field with different cropping years were determined.The results demonstrated that the change of urease and invertase were similar to one another,which was increased with the increasing of continuous cropping years,but the activity of phosphatase was decreased first,then was increased with the increasing of continuous cropping years.

摘要： [目的]测定不同连作年限土壤微生物主要类群及其数量变化以及土壤酶的活性.[方法]以新疆高产棉花连作5、10、15和20年的土壤为研究对象,测定土壤微生物数量和酶活性.[结果]棉花不同连作年限对土壤微生物环境产生了显著的影响.土壤中三大类微生物总数随着连作年限的增长呈下降趋势,细菌数量变化有极显著差异,真菌和放线菌变化无显著差异,棉田土壤B/F呈下降的趋势.[结论]对不同连作年限棉田土壤的脲酶、磷酸酶、蔗糖酶进行测定,结果脲酶、蔗糖酶的变化趋势一致,均随着连作年限的增加呈增强的趋势,磷酸酶活性随连作年限的增加先呈下降趋势,再随连作年限增加呈上升趋势.