• 关键词：互花米草入侵  铁还原菌  群落结构  多样性  河口湿地

• 基金项目：国家自然科学基金（No.41571287，42077086）；福建省高校杰出青年科研人才培育计划2017

• 陈钰
• 福建师范大学生命科学学院, 福州 350117

• 郑毅
• 福建师范大学生命科学学院, 福州 350117

• 王晓彤
• 福建师范大学生命科学学院, 福州 350117

• 许旭萍
• 福建师范大学生命科学学院, 福州 350117

• 陈桂香
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007

• 王维奇
• 1. 福建师范大学地理研究所, 福州 350007;2. 福建师范大学湿润亚热带生态地理过程教育部重点实验室, 福州 350007

• 摘要：互花米草是河口湿地典型的入侵物种，为了探究互花米草入侵对河口湿地铁还原菌群落结构及多样性影响，以闽江口秋茄湿地、闽江口芦苇湿地和漳江口白骨壤湿地3个典型的湿地为研究对象，分别对互花米草入侵前后土壤铁还原菌群落进行测定与分析.结果表明：①互花米草入侵使白骨壤湿地和芦苇湿地土壤铁还原菌多样性升高，使秋茄湿地铁还原菌多样性降低；②互花米草入侵白骨壤湿地后拟杆菌门（Bacteroidetes）相对丰度显著降低，变形菌门（Proteobacteria）铁还原菌的相对丰度显著提高（p<0.05）；③互花米草入侵使湿地土壤铁还原菌的优势菌属发生演替.互花米草入侵后，秋茄湿地中优势菌属除硫单胞菌（Desulfuromonas）的丰度显著降低成为非优势菌属，而厌氧粘细菌（Anaeromyxobacter）的丰度显著提高成为第三优势菌属；白骨壤湿地中互花米草入侵后拟杆菌属（Bacteroides）的丰度显著降低成为非优势菌属；④环境因子及碳组分影响湿地土壤铁还原菌的相对丰度，Geobacter的相对丰度与可溶性有机碳、土壤微生物量碳均呈显著负相关（p<0.01），Halothiobacillus的相对丰度与土壤总有机碳（SOC）呈显著正相关（p<0.05），与土壤微生物量碳（MBC）呈显著负相关（p<0.05）.研究结果可为治理互花米草过程中微生物多样性的恢复提供科学依据.

• Abstract：In order to explore the effects of Spartina alterniflora invasion on iron-reducing bacteria community structure and diversity in wetland, the soils were collected from typical wetland of Kandelia candel wetland, Phragmite australis wetland and Avicennia marina wetland, and the iron-reducing bacteria communities were determined and analyzed before and after the Spartina alterniflora invation. The results showed that: ①Iron-reducing bacteria diversity was increased in Avicennia marina wetland and Phragmite australis wetland, while the invasion reduced the diversity of iron-reducing bacteria in Kandelia candel wetland. ② The relative abundance of Bacteroidetes was significantly decreased, however, iron-reducing bacteria of Proteobacteria was significantly increased in the Avicennia marina wetland after Spartina alterniflora invasion(p<0.05). ③ Spartina alterniflora invasion caused the succession of the dominant genus of iron-reducing bacteria in wetland soil. The abundance of Desulfuromonas was significantly reduced and became the non-dominant genus, while the abundance of Anaeromyxobacter was significantly increased and became the third dominant genus after Spartina alterniflora invasion. The abundance of Bacteroides was significantly decreased and became the non-dominant genus in Phragmite australis wetland after Spartina alterniflora invasion.④The relative abundance of iron-reducing bacteria was affected by the environmental factors and organic carbon fractions in wetland soils. The relative abundance of Geobacter was significantly and negatively correlated with soil dissolved organic carbon, soil microbial biomass carbon and soil pH (p<0.01). The relative abundance of Halothiobacillus was significantly and positively correlated with soil total organic carbon (p<0.05) and significantly and negatively correlated with soil microbial biomass carbon (p<0.05). The results of this study could provide scientific basis for the restoration of microbial diversity in the process of Spartina alterniflora treating.

• Key words：Spartina alterniflora invasion  Iron-reducing bacteria  community structure  diversity  estuarine wetland

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