东祁连山高寒灌丛草地土壤微生物生理功能群的动态分布研究

The temporal and spatial distribution of soil microorganism physiological floras in alpine shrubs of the eastern Qilian mountains

通过对2005和2006年东祁连山杜鹃灌丛、高山柳灌丛和金露梅灌丛土壤微生物生理功能群的时空动态进行研究。结果表明,1）各微生物生理类群的季节变化趋势在2005与2006年存在差异;2）从土壤剖面层次来看,0～10 cm土层微生物生理功能群的数量大于10～20 cm土层;3）土壤微生物生理功能群的数量大小顺序为：硝化细菌〉反硝化细菌〉氨化细菌〉好气性自生固氮菌〉嫌气性自生固氮菌〉芽孢杆菌〉好气性纤维素分解菌〉嫌气性纤维素分解菌;4）不同灌丛土壤中,土壤微生物生理类群总数量不同表现为：高山柳灌丛〉杜鹃灌丛〉金露梅灌丛。

The temporal and spatial distribution characteristics of soil microorganism physiological groups of three alpine shrubs（Rhododendron fruticosa,Salix cupularis,Dasiphoru fruticosa） were studied in 2005 and 2006.The results showed that： 1） The seasonal dynamics of soil microorganism functional groups differed;2） At different soil depths,the numbers of soil microorganism functional groups in the top soil layer（0-10 cm） were higher than in the deeper layer（10-20 cm）;3） The quantity of soil microorganism functional groups was in the order,NitrifiersDenitrifying bacteriAmmonifying bacteriaAerobe AzotobacterAnaerobicAzotobacterBacillusAerobe cellulose decomposing microoganismsAnaerobic decomposing microorganisms;4） Total numbers of soil microorganism physiological groups differed in different shrubs.Numbers of groups in S.cupularis sites were larger than in the other two sites.Those in R.fruticosa sites were less than in the S.cupularis sites but more than in the D.fruticosa sites.