摘要
Understanding the impacts of co-invasion of multiple invaders on soil bacterial communities is significant in understanding the mechanisms driving successful invasion.This study aimed to determine the response of soil bacterial communities to co-invasion of two invaders daisy fleabane(Erigeron annuus)and Canada goldenrod(Solidago canadensis).Daisy fleabane and/or Canada goldenrod invasion significantly enhanced the operational taxonomic unit richness,Shannon index,and Chao1 index of soil bacterial communities.Canada goldenrod under light degree of invasion and co-invasion of daisy fleabane and Canada goldenrod regardless of invasion degree signally improved the ACE index of soil bacterial communities.Thus,the two invaders can enhance soil bacterial diversity and richness to facilitating subsequent invasion due to the fact that higher soil bacterial diversity and richness can enhance the levels of soil function and nutrients acquisition of plant species.ACE index of soil bacterial communities subjected to co-invasion of daisy fleabane and Canada goldenrod regardless of invasion degree was greater than that under the independent invasion of either daisy fleabane or Canada goldenrod.Hence,co-invasion of the two invaders can impose synergistic impacts on soil bacterial richness,which may build a preferable soil micro-environment via the intensified soil bacterial communities,which is contributive to their following invasion.
一些入侵植物成功入侵的主因之一就是它们促进其根际土壤微生物群落的演替。此外,同一生态系统中可能遭受两种甚至是两种以上入侵植物的入侵。所以,探究共同入侵的入侵植物对土壤细菌群落的影响对阐明入侵植物成功入侵的机理具有重要作用。本文以高通量测序技术为手段,探究不同入侵程度的一年蓬和加拿大一枝黄花共同入侵对土壤细菌群落结构的影响。一年蓬和/或加拿大一枝黄花入侵显著增加了土壤细菌的、Shannon指数和Chao1指数。低度入侵的加拿大一枝黄花以及一年蓬和加拿大一枝黄花共同入侵显著增加了土壤细菌的ACE指数。一年蓬和/或加拿大一枝黄花可通过增加土壤细菌群落的多样性和丰度促进了其进一步的入侵进程,高的土壤细菌群落多样性和丰度可提升土壤功能和营养获取水平。与一年蓬和加拿大一枝黄花单一入侵相比,一年蓬和加拿大一枝黄花共同入侵显著增加了土壤细菌的ACE指数。因此,一年蓬和加拿大一枝黄花共同入侵对影响土壤细菌群落丰度具有协同作用,构建了一个利于其自身生长及其进一步入侵的土壤微环境条件。
基金
Project(31300343)supported by the National Natural Science Foundation of China
Project(PCRRF19009)supported by Open Science Research Fund of State Key Laboratory of Pollution Control and Resource Reuse(Tongji University),China
Project supported by Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,China。
