烟草连作对旱地土壤微生物及酶活性的影响  

Effect of Continuous Cropping Tobacco on the Microbes and Enzyme Activities in Dry Land Soil

作　　者：盘莫谊[1] 张杨珠[1] 肖嫩群[1] 谭周进[2] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128 [2]湖南中医药大学基础医学院,长沙410208

出　　处：《世界科技研究与发展》2008年第3期295-297,共3页World Sci-Tech R&D

基　　金：湖南省烟草总公司课题(05-02);"十五"国家科技攻关课题(2004BA520A01)

摘　　要：测定了烟草不同连作年限的旱地土壤中微生物数量、活度及酶活性。结果表明,连作8年以下的旱地土壤中的好气性细菌、厌气性细菌、放线菌及真菌的数量随连作年限增加而有上升趋势,连作8年以上的微生物数量却有下降趋势。烟草连作对旱地土壤的细菌数量影响最大,对真菌数量的影响次之,对放线菌数量的影响最小。烟草连作对旱地土壤微生物活度及土壤酶活性的影响不大。烟草长期连作将改变土壤微生物的数量及多样性,会影响连作病害的发生,不利于土壤生态系统的健康发展。The studies on the effect of continuous cropping tobacco on the microbial quantities, activities and enzyme activities in dry land soil were conducted. The results showed that when the tobacco-continuous-cropping time was within 8 years, the quantities of aerobic bacterium, anaerobic bacterium,actinomycetes and fungus in dry land soils increased with the continuous-cropping years. When the tobacco-continuous- cropping time was more than 8 years ,the quantities of the above microbes in dry land soils would decrease. The effect rule of tobacco continuous cropping on microbes in dry land soil was bacterium 〉 fungus 〉 actinomycetes. The effect of tobacco continuous cropping on the activities of urease, cellulase ,protease and catalase in the dry land soil was small. The microbial flora and diversity in soil would be changed by tobac- co continuous cropping. The plant diseases would often happen in tobacco continuous cropping soil. The long-term tobacco continuous cropping does not benefit the soil ecosystem to develop healthily.

关 键 词：烟草连作 土壤微生物 微生物活度 土壤酶 

分 类 号：S572[农业科学—烟草工业]