Variation Characteristics of Microbial Community in the Surface Soil of Different Stand Types
In recent years,high economic benefits is driving the transformation of management mode of pure Moso bamboo(Phyllostachys edulis)forests to mixed forests.However,the variations of soil quality and soil microbial community in response to such land use changes have not been fully understood,which restricts the sustainable development of the composite management model of bamboo forests.The space-for-time sub-stitution method was employed to study the variation characteristics of soil microbial community under the transformation of evergreen broad-leaved forest into pure Moso bamboo forest and the transformation of pure Moso bamboo forest into bamboo-tea mixed forest,which aimed to provide a theoretical basis for the compos-ite management of Moso bamboo forests.Furthermore,the key environmental factors affecting the variations of soil microbial community were studied.The results showed that compared with the evergreen broad-leaved forest,the pure Moso bamboo forest demonstrated significant variations of soil bacterial and fungal communi-ty composition,in which the bacterial Observed species index increased by 9.08%,and the bacterial and fun-gal community networks presented decreased nodes and increased edges of negative correlations.At the same time,soil nutrients were reduced.After the pure Moso bamboo forest was transformed into the bamboo-tea mixed forest,the soil nutrients and the soil bacterial community stability and synergism were improved to a certain extent.Redundancy Analysis(RDA)showed that Soil Organic Carbon(SOC)and pH value were the main factors affecting the soil microbial community.Therefore,compared with the evergreen broad-leaved forest,the pure Moso bamboo forest needs more management efforts to improve soil microbial stability and soil quality.The transformation of pure Moso bamboo forest to bamboo-tea mixed forest improves the stabili-ty of soil bacterial community and promotes the restoration of soil quality to some extent.
Phyllostachys edulis forestevergreen broad-leaved forestbamboo-tea mixed forestsoil microbial community