Institute of Wetland Research, Chinese Academy of Forestry, Beijing, 100091, China.
Beijing Key Laboratory of Wetland Ecological Function and Restoration, Beijing, China.
Microb Ecol. 2017 Nov;74(4):877-887. doi: 10.1007/s00248-017-0992-0. Epub 2017 May 10.
Increasing efforts have been devoted to exploring the impact of environmental stresses on soil bacterial communities, but the work on the archaeal community is seldom. Here, we constructed microcosm experiments to investigate the responses of archaeal communities to the subsequent dry-rewetting (DW) disturbance in two contrasting soils (fluvo-aquic and red soil) after 6 years of copper pollution. Ten DW cycles were exerted on the two soils with different copper levels, followed by a 6-week recovery period. In both soils, archaeal diversity (Shannon index) in the high copper-level treatments increased over the incubation period, and archaeal community structure changed remarkably as revealed by the non-metric multidimensional scaling ordinations. In both soils, copper pollution altered the response of dominant operational taxonomic units (OTUs) to the DW disturbance. Throughout the incubation and recovery period, the resistance of archaeal abundance to the DW disturbance was higher in the copper-polluted soils than soils without pollution. Taken together, copper pollution altered the response of soil archaeal diversity and community composition to the DW disturbance and increased the resistance of the archaeal abundance. These findings have important implications for understanding soil microbial responses to ongoing environmental change.
人们越来越关注环境胁迫对土壤细菌群落的影响，但对古菌群落的研究却很少。在这里，我们构建了微宇宙实验，以研究在铜污染 6 年后，两种不同土壤（潮土和红壤）中，古菌群落对随后的干湿（DW）干扰的响应。对两种不同铜水平的土壤施加了 10 个 DW 循环，随后进行了 6 周的恢复期。在两种土壤中，高铜水平处理的古菌多样性（香农指数）在孵育期间增加，古菌群落结构通过非度量多维标度排序明显改变。在两种土壤中，铜污染改变了优势操作分类单元（OTUs）对 DW 干扰的响应。在整个孵育和恢复期内，受铜污染土壤中古菌丰度对 DW 干扰的抵抗力高于无污染土壤。总的来说，铜污染改变了土壤古菌多样性和群落组成对 DW 干扰的响应，并增加了古菌丰度的抵抗力。这些发现对于理解土壤微生物对持续环境变化的响应具有重要意义。
