土壤固碳微生物群落对互花米草治理后红树林替代的响应
- Response of soil carbon-fixing microbial community to mangrove replacement after Spartina alterniflora management
- 基金项目：国家自然科学(No. 42141014)
- 王维奇
- 福建师范大学地理研究所;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
- 摘要：为探究固碳微生物对互花米草治理后红树林替代的响应。本研究以福建省宁德市两个研究区互花米草治理后的红树林湿地与光滩湿地为研究对象，对土壤理化因子、固碳菌群落结构及多样性等进行测定与分析。结果表明：①不同研究区的土壤理化性质对于互花米草治理后红树林替代的响应不同。相较光滩，东吾洋红树林替代后土壤容重由1.06 g·cm-3显著下降为0.89 g·cm-3(P<0.05)，电导率和含水量分别由7.25 mS·cm-1显著提高为8.54 mS·cm-1和由60.32% 显著提高为78.36%(P<0.05)，而溪邳村湿地差异不显著；②两研究区的固碳菌在门水平上主要为变形菌门，且在受红树林替代后无显著改变，但属水平上略有差异，溪邳村湿地在红树林替代后优势菌属为硫碱弧菌属、Sulfuritortus、外红硫螺菌属，东吾洋红树林湿地优势菌属为硫单胞菌属、硫碱弧菌属、外红硫螺菌属；③RDA分析表明，溪邳村红树林湿地的固碳菌群落主要受土壤容重的调控，东吾洋红树林湿地主要受含水量与电导率的调控。本研究可为互花米草治理后湿地土壤微生物多样性的保护提供理论依据。
- Abstract：To explore how carbon-fixing bacteria respond to the replacement of mangrove following Spartina alterniflora management, this study examined both mangrove and bare flat wetlands in two areas of Ningde City, Fujian Province. Soil physicochemical parameters as well as the structure and diversity of carbon-fixing bacteria community were analyzed. The findings revealed ① distinct responses in soil properties between the two study sites after mangrove replacement. In Dongwuyang, compared with the bare flat, soil bulk density significantly decreased from 1.06 g·cm-3 to 0.89 g·cm-3 (P<0.05), while electrical conductivity and water content significantly increased from 7.25 mS·cm-1 to 8.54 mS·cm-1 and from 60.32% to 78.36% (P<0.05), respectively. Conversely, changes in the Xipi Village wetland were not significant. ② In terms of bacterial composition, carbon-fixing bacteria across both study areas were predominantly from the phylum Proteobacteria, with no major shifts observed after mangrove replacement. However, there were slight differences at the genus level. In the Xipi Village wetland, the dominant genera after mangroves replacement were Thioalkalivibrio, Sulfuritortus and Ectothiorhodospira, whereas in the Dongwuyang mangrove wetland, the dominant genera were Thiomonas, Thioalkalivibrio and Ectothiorhodospira. ③ RDA analysis indicated that the carbon-fixing bacteria community in the Xipi Village mangrove wetland was primarily influenced by bulk density, whereas in the Dongwuyang mangrove wetland, it was mainly regulated by water content and electrical conductivity. This study provides a theoretical basis for the conservation of carbon-fixing bacterial diversity in wetland soils following S. alterniflora management.
