| With rhizosphere of four invasive plants (Ageratina adenophora, Eupatorium odoratum, Annual fleabane, Erigeron canadensis) and native plant (Artemisia argyi) as research subjects, the effects of different invasive plants on rhizosphere soil physical and chemical properties, soil enzyme activities and soil microbe quantities of native plant were
assessed. The results showed that invasive plants increased the rhizosphere soil water and electrical conductivity of native plant, also significantly decreased the soil microbial biomass, soil enzyme activities and soil microbe quantities. Meanwhile,invasive plants changed the soil nutrients utilization strategy at rhizosphere, they restrained the cellulase activity and nitrate reductase significantly, invertase and acid phosphatase activities of A. adenophora and E. odoratum soil were significantly higher than those of A. argyi, while those of A. Fleabane and E. canadensiswere were significantly lower than those of A. argyi, and the activities of nitrate reductase of four invasive plants were equivalent basically. While, invasive plants increased the bacterial amount significantly and significantly decrease the fungal and actinomycetic amount contrarily. In total, invasive plants significantly increased the total number of microorganisms. Correlation analysis showed that except soil bulk density, conductivity and total porosity, other rhizosphere soil properties had a strong correlation with soil enzyme activities and soil microbe quantities, which suggested that the factors in soil system were in dynamic change and balance, they interacted and influenced each other as an organic whole having uniformity and synchronicity. |
