垄作免耕对土壤团聚体中微生物生物量N和脲酶活性的影响  

Ridge Tillage on Soil Aggregates Microbial Biomass N and Urease Activity

作　　者：张东升[1] 蒋先军[1] 袁俊吉[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《中国农学通报》2011年第8期254-258,共5页Chinese Agricultural Science Bulletin

摘　　要：笔者分选出垄作免耕、常规耕作、冬水田每种耕作方式下的7个粒径的土壤团聚体,测定了3种耕作方式下土壤微生物生物量N及土壤团聚体中脲酶的活性,试图找到土壤团聚体中脲酶的活性与土壤耕作方式的关系,以及土壤团聚体中脲酶的活性和土壤微生物生物量N的相关性。结果表明:土壤微生物生物量的分布主要受土壤结构体的制约,受耕作方式的影响不显著;不同的耕作方式对土壤团聚体中脲酶活性的影响比较明显;脲酶活性与微生物生物量N无显著相关性,说明紫色水稻土中脲酶的主要来源可能不是微生物。This article sub-elected seven sizes of soil aggregate under ridge tillage,conventional tillage and winter paddy field.Soil microbial biomass nitrogen and urease activity of soil aggregates were measured under the three tillage practices.The author tried to find the soil aggregates and soil urease activity of the relationship between tillage or soil aggregates in the urease activity and microbial biomass N correlation.The results showed that： the distribution of microbial biomass was mainly affected by soil structure,and not significant by tillages.The effect of different tillage methods on soil aggregates in the urease activity were obvious;urease activity and microbial biomass were not significantly correlated,indicating that the main source of urease in purple paddy soil might not be microorganisms.

关 键 词：耕作 土壤团聚体 脲酶活性 微生物量N 

分 类 号：S154.36[农业科学—土壤学]