Abstract Non-native earthworms have increasingly become a global problem due to the strong effects they exert on biodiversity and ecosystem functions in their introduced habitat. Quantifying interactions between non-native earthworm and microbial communities in forest ecosystems should increase our understanding of non-native earthworm-induced changes in soil biogeochemical cycles and plant diversity. In a microcosm experiment, we investigated non-native earthworm-microbial interactions in soils originating from three typical subtropical forests in which pan-tropical non-native Pontoscolex corethrurus (Muller, 1857) was the dominant earthworm. Our study showed that P. corethrurus strongly affected the soil microbial communities in all three soils. The cast production and burrowing activities of P. corethrurus significantly reduced total soil microbial biomass and soil bacterial biomass, but did not change soil fungal biomass. As a consequence, P. corethrurus substantially increased the ratio of fungi to bacteria. For most soil microbial properties, these effects occurred in all three soils, i.e., they were independent of habitat type. Furthermore, the microbial communities in the three forest soils were found to be more similar with than without P. corethrurus. These results suggest that P. corethrurus can greatly affect soil microbial communities in a variety of habitats where the earthworm has been introduced. Our results also showed that microbial biomass was substantially higher in the P. corethrurus gut than in the surrounding soil and that new habitat types can modify the microbial community in the gut of P. corethrurus.

中文翻译：

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非本地蚯蚓对三个亚热带森林土壤微生物群落的一致影响

摘要 由于外来蚯蚓对引入栖息地的生物多样性和生态系统功能产生强烈影响，它们日益成为一个全球性问题。量化森林生态系统中非本地蚯蚓和微生物群落之间的相互作用应该增加我们对非本地蚯蚓引起的土壤生物地球化学循环和植物多样性变化的理解。在一个微观实验中，我们研究了源自三个典型亚热带森林的土壤中非本地蚯蚓与微生物的相互作用，其中泛热带非本地 Pontoscolex corethrurus (Muller, 1857) 是主要的蚯蚓。我们的研究表明，P. corethrurus 强烈影响了所有三种土壤中的土壤微生物群落。P.的铸件生产和挖洞活动。corethrurus 显着降低了土壤微生物总生物量和土壤细菌生物量，但没有改变土壤真菌生物量。因此，P. corethrurus 大大增加了真菌与细菌的比例。对于大多数土壤微生物特性，这些影响发生在所有三种土壤中，即它们与栖息地类型无关。此外，发现与没有 P. corethrurus 相比，三种森林土壤中的微生物群落更相似。这些结果表明，P. corethrurus 可以极大地影响引入蚯蚓的各种栖息地的土壤微生物群落。我们的结果还表明，P. corethrurus 肠道中的微生物生物量比周围土壤中的要高得多，并且新的栖息地类型可以改变 P. corethrurus 肠道中的微生物群落。