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Changes in Soil Microbial Community Associated with Invasion of the Exotic Weed, Mikania micrantha H.B.K

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Abstract

Invasions of exotic plant species are among the most pervasive and important threats to natural ecosystems. However, the effects of plant invasions on soil processes and soil biota have not been adequately investigated. Changes were studied in soil microbial communities where Mikania micrantha was invading a native forest community in Neilingding Island, Shenzhen, China. The soil microbial community structure (assessed by phospholipid fatty acid [PLFA] profiles) and function (assessed by enzyme activities), as well as soil chemical properties were measured. The results showed that the invasion of M. micrantha into the evergreen broadleaved forests in South China changed most of the characteristics in studied soils. Microbial community structure and function differed significantly among the native, two ecotones, and exotic-derived soils. For PLFA profiles, we observed a significant increase in aerobic bacteria but a decrease in anaerobic bacteria in the M. micrantha monoculture as compared to the native and ecotones. The ratio of cy19:0 to18:1ω7 gradually declined but mono/sat PLFAs increased as M. micrantha became more dominant. Both ratios were significantly related to pH according to regression analysis, therefore, pH was a sensitive indicator reflecting the invaded soil subsystem succession. The microbial community composition clearly separated the native soil from the invaded soils by principal component analysis (PCA) and discriminant analysis (DA). For enzyme activities, 7 of 9 enzymes (β-glucosidase, invertase, protease, urease, acid phosphatase, alkaline phosphatase, and phenol oxidase) showed the similar trend that the activities were highest in the exotic, intermediate in the two ecotones, and lowest in the native community. In most cases, enzyme activities were influenced by soil chemical properties, especially by pH value and soil organic matter. Differences in the structural variables were well correlated to differences in the functional variables as demonstrated by canonical correlation analysis (CCA). It was concluded that M. micrantha invasion had profound effects on the soil subsystem, which must be taken into account when we try to control its invasions.

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Li, Wh., Zhang, Cb., Jiang, Hb. et al. Changes in Soil Microbial Community Associated with Invasion of the Exotic Weed, Mikania micrantha H.B.K. Plant Soil 281, 309–324 (2006). https://doi.org/10.1007/s11104-005-9641-3

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