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.

理解多种入侵者共同入侵对土壤细菌群落的影响，对于理解驱动成功入侵的机制具有重要意义。这项研究的目的是确定土壤细菌群落对两种侵染者的侵袭：菊苣（Erigeron annuus）和加拿大菊科（加拿大一枝黄花））。雏菊氟乙烷和/或加拿大菊科植物的入侵显着提高了土壤细菌群落的操作分类单位丰富度，香农指数和超1指数。加拿大菊科植物在轻度入侵和共侵染雏菊fleabane的情况下和加拿大菊科植物无论入侵程度如何，都标志着土壤细菌群落ACE指数的提高。因此，由于较高的土壤细菌多样性和丰富度可以增强土壤功能水平和植物物种的养分吸收，因此这两个入侵者可以增强土壤细菌的多样性和丰富度，以利于随后的入侵。不论入侵程度如何，均受到菊黄和加拿大菊科植物共同侵染的土壤细菌群落的ACE指数均大于菊黄或加拿大菊科植物独立入侵的土壤细菌群落的ACE指数。因此，两个入侵者的共同入侵可以对土壤细菌的丰富性产生协同影响，这可以通过增强的土壤细菌群落建立更好的土壤微环境，这有助于他们的后续入侵。