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首页> 外文期刊>Plant and Soil >An invasive aster (Ageratina adenophora) invades and dominates forest understories in China: altered soil microbial communities facilitate the invader and inhibit natives.
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An invasive aster (Ageratina adenophora) invades and dominates forest understories in China: altered soil microbial communities facilitate the invader and inhibit natives.

机译：入侵性紫苑（Ageratina adenophora）入侵并统治着中国的森林底层：改变的土壤微生物群落促进了入侵并抑制了当地人。

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Exotic plant invasion may alter underground microbial communities, and invasion-induced changes of soil biota may also affect the interaction between invasive plants and resident native species. Increasing evidence suggests that feedback of soil biota to invasive and native plants leads to successful exotic plant invasion. To examine this possible underlying invasion mechanism, soil microbial communities were studied where Ageratina adenophora was invading a native forest community. The plant-soil biota feedback experiments were designed to assess the effect of invasion-induced changes of soil biota on plant growth, and interactions between A. adenophora and three native plant species. Soil analysis showed that nitrate nitrogen (NO3--N), ammonium nitrogen (NH4+-N), and available P and K content were significantly higher in a heavily invaded site than in a newly invaded site. The structure of the soil microbial community was clearly different in all four sites. Ageratina adenophora invasion strongly increased the abundance of soil VAM (vesicular-arbuscular mycorrhizal fungi) and the fungi/bacteria ratio. A greenhouse experiment indicated that the soil biota in the heavily invaded site had a greater inhibitory effect on native plant species than on A. adenophora and that soil biota in the native plant site inhibited the growth of native plant species, but not of A. adenophora. Soil biota in all four sites increased A. adenophora relative dominance compared with each of the three native plant species and soil biota in the heavily invaded site had greater beneficial effects on A. adenophora relative dominance index (20% higher on average) than soil biota in the non-invaded site. Our results suggest that A. adenophora is more positively affected by the soil community associated with native communities than are resident natives, and once the invader becomes established it further alters the soil community in a way that favors itself and inhibits natives, helping to promote the invasion. Soil biota alteration after A. adenophora establishment may be an important part of its invasion process to facilitate itself and inhibit native plants.
机译：外来植物的入侵可能会改变地下微生物群落，入侵引起的土壤生物区系变化也可能会影响入侵植物与居民本地物种之间的相互作用。越来越多的证据表明，土壤生物群对入侵植物和本地植物的反馈会导致成功的外来植物入侵。为了检查这种潜在的潜在入侵机制，研究了紫茎泽兰入侵本地森林群落的土壤微生物群落。设计了植物-土壤生物区系反馈实验，以评估入侵诱导的土壤生物区系变化对植物生长以及紫茎泽兰与三种天然植物物种之间相互作用的影响。土壤分析表明，在重度入侵的地区，硝酸盐氮（NO3--N），铵态氮（NH4 + -N）以及有效磷和钾含量显着高于新入侵的地区。在所有四个地点，土壤微生物群落的结构明显不同。紫茎泽兰的入侵强烈增加了土壤VAM（水泡-丛枝菌根真菌）的含量和真菌/细菌的比例。温室实验表明，重度侵袭位点的土壤生物区系对本地植物物种的抑制作用比对紫茎泽兰具有更大的抑制作用，而原生植物位点的土壤生物区系抑制了本地植物物种的生长，但对紫茎泽兰的抑制作用却没有。 。与三种本地植物物种相比，四个地点的土壤生物区系均增加了紫茎泽兰的相对优势度，而重度入侵地区的土壤生物区系对紫茎泽兰的相对优势度指数（平均高出20％）的影响更大。在非入侵网站中。我们的研究结果表明，紫茎泽兰比本地居民更容易受到与当地社区相关联的土壤群落的影响，一旦入侵者建立，它将进一步改变土壤群落，从而有利于自身并抑制本地人，从而有助于促进入侵。紫茎泽兰建立后的土壤生物区系改变可能是其入侵过程的重要组成部分，以促进自身生长并抑制天然植物。

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