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The Exotic Legume Tree Species Acacia holosericea Alters Microbial Soil Functionalities and the Structure of the Arbuscular Mycorrhizal Community▿

机译:外来豆科树种金合欢改变微生物土壤功能和丛枝菌根群落的结构▿

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摘要

The response of microbial functional diversity as well as its resistance to stress or disturbances caused by the introduction of an exotic tree species, Acacia holosericea, ectomycorrhized or not with Pisolithus albus, was examined. The results show that this ectomycorrhizal fungus promotes drastically the growth of this fast-growing tree species in field conditions after 7 years of plantation. Compared to the crop soil surrounding the A. holosericea plantation, this exotic tree species, associated or not with the ectomycorrhizal symbiont, induced strong modifications in soil microbial functionalities (assessed by measuring the patterns of in situ catabolic potential of microbial communities) and reduced soil resistance in response to increasing stress or disturbance (salinity, temperature, and freeze-thaw and wet-dry cycles). In addition, A. holosericea strongly modified the structure of arbuscular mycorrhizal fungus communities. These results show clearly that exotic plants may be responsible for important changes in soil microbiota affecting the structure and functions of microbial communities.
机译:考察了微生物功能多样性的响应及其对引入外来树种(不论是否经白僵菌除草)的外来树种金合欢(Acacia holosericea)引起的胁迫或干扰的抵抗力。结果表明,经过7年的种植,这种外生菌根真菌在田间条件下极大地促进了这种快速生长的树种的生长。相比于A. holosericea种植园周围的农作物土壤,这种外来树种,无论是否伴有外生菌根共生体,均会引起土壤微生物功能的强烈改变(通过测量微生物群落原位分解代谢潜力的模式进行评估),土壤减少应对不断增加的压力或干扰(盐度,温度以及冻融和干湿循环)。此外,A。holosericea强烈改变了丛枝菌根真菌群落的结构。这些结果清楚地表明,外来植物可能是影响土壤微生物群落的重要变化,从而影响了微生物群落的结构和功能。

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