CAS Key Laboratory of Tropical Forest Ecology, 74740Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, China.
Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, China.
Sci Prog. 2023 Jan-Mar;106(1):368504221150060. doi: 10.1177/00368504221150060.
The biodiversity of aboveground plants and belowground microbes is key for plant communities resisting exotic plant invasion. Whether the soil legacy effects after the invasion are related to the diversity of the invaded community is less studied. Soils from invaded communities were collected and potted to investigate the effects of the invasive community's legacy on the biomass allocation of plants that later grew in these soils. The plots where native plants were present had relatively high nutrient levels (except for available nitrogen) compared to the monodominance communities invaded by . This also indirectly suggests that the severe invasion of depleted the nutrients in the soil to a greater extent. When soils were from communities with only or one native plant, their biotic legacies showed a significantly positive effect on biomass accumulation of subsequent invasive plants, but this positive effect became negative when more than two native plants were present in the invaded community. This result indicated that the effect of biological resistance increases with the number increase of native species in the invaded communities. The soil legacy effect of the invaded communities on subsequent plants depended on the diversity of native plants. This study can provide insights into the mechanisms of soil biological resistance to exotic plant invasion and provide a theoretical basis for the removal of soil legacy effects after the exotic plant invasion.
地上植物和地下微生物的生物多样性是植物群落抵御外来植物入侵的关键。入侵后土壤的遗留效应是否与入侵群落的多样性有关，这方面的研究还较少。本研究收集了入侵群落的土壤并进行盆栽实验，以调查入侵群落的遗留效应对随后在这些土壤中生长的植物生物量分配的影响。与单优群落相比，存在本地植物的样方具有相对较高的养分水平（除了有效氮）。这也间接表明， 的严重入侵在更大程度上耗尽了土壤中的养分。当土壤来自只有 或一种本地植物的群落时，它们的生物遗留效应对后续入侵植物的生物量积累有显著的正向影响，但当入侵群落中有超过两种本地植物时，这种正向影响变为负向。这一结果表明，生物抗性的效应随着入侵群落中本地物种数量的增加而增加。入侵群落对后续植物的土壤遗留效应取决于本地植物的多样性。本研究可以深入了解土壤生物对入侵外来植物的抗性机制，并为外来植物入侵后土壤遗留效应的消除提供理论依据。
