Li Lin, Wang Xia, Yang Yanli, Wang Siyu, Chen Kelong, Zhang Ni
College of Life Sciences, Qinghai Normal University, Xining 810008, China.
Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining 810008, China.
Biology (Basel). 2024 Dec 23;13(12):1090. doi: 10.3390/biology13121090.
The dramatic changes in precipitation patterns on the Tibetan Plateau affected the carbon-sequestering microbial communities within wetland ecosystems, which were closely related to the responses and adaptation mechanisms of alpine wetland ecosystems to climate change. This study focused on wetland soils subjected to different precipitation gradient treatments and employed high-throughput sequencing technology to analyze the soil cbbM carbon-sequestering microbial communities. The results indicated that Proteobacteria were the dominant microbial community responsible for carbon sequestration in the Wayan Mountain wetland. A 50% increase in precipitation significantly raised the soil moisture content, while a 50% reduction and a 25% increase in precipitation notably enhanced the total soil carbon content. The 25% reduction in precipitation increased the differences in microbial community composition, whereas both the 50% increase and the 50% reduction in precipitation decreased these differences. The soil pH and temperature had the most significant impact on the carbon-sequestering microbial communities. In conclusion, changes in precipitation affect the cbbM carbon sequestration characteristics of soil microbial communities, and a moderate reduction in water input benefited carbon sequestration in wetlands.
青藏高原降水格局的剧烈变化影响了湿地生态系统中固碳微生物群落，这与高寒湿地生态系统对气候变化的响应和适应机制密切相关。本研究聚焦于不同降水梯度处理下的湿地土壤，采用高通量测序技术分析土壤中cbbM固碳微生物群落。结果表明，变形菌门是瓦岩山湿地负责碳固定的主要微生物群落。降水量增加50%显著提高了土壤湿度，而降水量减少50%和增加25%则显著提高了土壤总碳含量。降水量减少25%增加了微生物群落组成的差异，而降水量增加50%和减少50%均降低了这些差异。土壤pH值和温度对固碳微生物群落影响最为显著。总之，降水变化影响土壤微生物群落的cbbM碳固定特征，适度减少水分输入有利于湿地碳固存。
