EFFECTS OF REPLACEMENT CONTROL WITH HUMULUS SCANDENS ON THE RHIZOSPHERE MICROBIAL COMMUNITY DIVERSITY OF THE INVASIVE PLANT, ALTERNANTHERA PHILOXEROIDES

The impacts of invasive plants are known to be mediated by plant- microbial interactions. Many ecologists are interested in the variance of the microbial community structure of invasive plants and native plants in the rhizosphere soils. In order to clarify the interaction mechanism between native plants and invasive plants, we reported the characteristics of soil microbial communities in invasive plants under different degrees of replacement plant. Alternanthera philoxeroides (Mart.) Griseb. is a serious invasive weed in many regions. Rhizospheric soils of A. philoxeroides with different degrees of substitution by Humulus scandens (Lour.) Merr. (unreplacement, low degree, high degree, replacement and CK using its coverage in the invaded ecosystems) were collected. pH, soil electrical conductance, available phosphorous and available potassium were major factors to alter the microbial community structure of A. philoxeroides in the rhizosphere. Plant replacement significantly reduced the abundance of Acidobacteria and Verrucomicrobia, but not Chloroflexi and Actinobacteria. Low and high degrees of H. scandens increased the richness of soil fungal community. Overall, the results suggested that rhizosphere microbes were changed by replacement plant of this invader in the novel environment, which provided a theoretical basis for the control of A. philoxeroides.