植烟土壤酶活性对连作的响应及其与土壤理化特性的相关性研究

目的]研究植烟土壤酶活性对连作的响应及其与土壤理化特性的相关性,以期为烟叶基地土壤改良提供技术支撑。方法]对我国主要烟叶产区(云南玉溪、贵州福泉、湖南浏阳)连作植烟土壤过氧化氢酶和脲酶2种酶活性特征进行了研究,并探讨2种酶活性与土壤理化指标的相关性。结果]过氧化氢酶活性与有机质含量呈正相关,脲酶活性与全磷含量呈正相关,2种酶与交换性钾含量均呈负相关。结论]长期连作使土壤酶活性降低。酶活性与土壤理化指标具有一定相关性。

Study on Impacts of Monocropping Tobacco on Soil Enzyme Activity and Correlation with Soil Physical and Chemical Properties

Objective]The impacts of monocropping tobacco on soil enzyme activity and theirs correlation with soil physical and chemical properties were studied to provide technical support on soil improvement in tobacco leaf production base.Method]Two enzymes activity(catalase and urease) in monocropping tobacco soil in china main tobacco production areas(Yuxi in Yunnan Province,Fuquan in Guizhou Province,Liuyang in Hunan Province) were studied.The correlation was discussed between two kinds of enzyme activity and soil physical and chemical indexes.Result]It was a positive correlation between catalase and organic matter content,and the same as urease activity with total phosphorus content,but a negative correlation between two enzymes and exchangeable potassium.Conclusion] The soil enzyme activity which had certain correlation with soil physical and chemical index decreased in the long-term monocropping tobacco.