三江平原不同土壤类型中微生物种类多样性研究

摘要

Isolation,identification and statistical analysis were made on microbes from four different types of soil:soybean field soil tillaged successive years(DD),paddy field soil cultivated successive years(SD),uncultivated original ecology soil(XYZ) and soil of farmed grain for green land(C).The result showed that the soil of the Sanjiang Plain mainly contained dominant bacteria of eight genus.Distribution trends of these microbes in soil profiles are:surface layer(0~20 cm),sub-surface(20~30 cm),deep(30 cm or less).Composition and relative density of microbes in different types of soil are significantly different,which clarified the species diversity of soil microorganisms.%通过对三江平原连年耕作大豆田的土壤（DD）、连年耕作水稻田的土壤（SD）、未开垦过原生态的土壤（XYZ）、耕作过又被退耕还草的土壤（C）4种土壤类型中的微生物进行分离鉴定及数量统计分析,结果表明三江平原土壤中微生物主要由8种优势细菌菌属组成,微生物在土壤剖面中的分布趋势是表层（0～20cm）〉亚表面（20～30 cm）〉深层（30 cm以下）,不同土壤类型中细菌类群的组成和相对密度有明显不同,从而阐明土壤微生物的种类多样性.