不同光照条件下草地早熟禾根际微生物区系动态研究

Studies on Rhizosphere Microflora Dynamics of Kentucky bluegrass under Different Quality of Illumination

研究了草地早熟禾在不同光照条件下其根际与非根际细菌、真菌、放线菌以及氨化细菌、硝化细菌、好气性纤维素分解菌、固氮菌生理类群的区系动态变化,拟从根际土壤微生物数量变化方面来阐述草地早熟禾对不同光照条件的响应规律。结果表明,草地早熟禾根际细菌及四类细菌生理群数量与光照条件呈正相关,随着光照条件的减弱,其数量呈降低趋势;根际放线菌数量随光照的减弱呈先下降后上升的趋势;而真菌数量与光照条件呈负相关,随着光照条件的减弱,根际真菌的数量逐渐增加;草地早熟禾根际土壤由“细菌型”向“真菌型”转化;不同光照条件下,根际各微生物类群都表现出明显的根际效应。

The rhizosphere microflora dynamics of bacteria, actinomyces, fungi and four bacterial physiological groups of Kentucky bluegrass under different quality of illumination were studied by adopting selective culture medium to explain scientifically response regular of this grass to different illumination condition. The results showed that quantity of bacterium and four bacterial physiology groups was positively correlated with quality of illumination; their quantity showed a reduced tendency with the reducing of the illumination condition, but quantity of fungi was negatively correlated, it was increased gradually with the reducing of the illumination condition; rhizosphere soil of Kentucky bluegrass turned into fungi type from bacterium type; the rhizosphere effect of various bacterial physiological group of Kentucky bluegrass is obvious under different quality of illumination.