Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; Key Laboratory of Soil and Water Conservation and Ecological Restoration in Jiangsu Province, Nanjing 210037, China.
Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China; Key Laboratory of Soil and Water Conservation and Ecological Restoration in Jiangsu Province, Nanjing 210037, China.
Sci Total Environ. 2024 Nov 1;949:174692. doi: 10.1016/j.scitotenv.2024.174692. Epub 2024 Jul 11.
Global warming may reshape seasonal changes in microbial community diversity and co-occurrence network patterns, with significant implications for terrestrial ecosystem function. We conducted a 2-year in situ field simulation of the effects of warming on the seasonal dynamics of soil microbial communities in a northern subtropical Quercus acutissima forest. Our study revealed that warming had no significant effect on the richness or diversity of soil bacteria or fungi in the growing season, whereas different warming gradients had different effects on their diversity in the nongrowing season. Warming also changed the microbial community structure, increasing the abundance of some thermophilic microbial species and decreasing the abundance of some symbiotrophic microorganisms. The co-occurrence network analysis of the microbial community showed that warming decreased the complexity of the intradomain network in the soil bacterial community in the growing and nongrowing seasons but increased it in the fungal community. Moreover, increasing warming temperatures increased the complexity of the interdomain network between bacteria and fungi in the growing season but decreased it in the nongrowing season, and the keystone species in the interdomain network changed with warming. Warming also reduced the proportion of positive microbial community interactions, indicating that warming reduced the mutualism, commensalism, and neutralism of microorganisms as they adapted to soil environmental stress. The factors affecting the fungal community varied considerably across warming gradients, with the bacterial community being significantly affected by soil temperature, MBC, NO-N and NH-N, moreover, SOC and TN significantly affected fungal communities in the 4 °C warming treatment. These results suggest that warming increases seasonal differences in the diversity and complexity of soil microbial communities in the northern subtropical region, significantly influencing soil dynamic processes regulating forest ecosystems under global warming.
全球变暖可能重塑微生物群落多样性和共生网络模式的季节性变化，对陆地生态系统功能有重大影响。我们在北亚热带锐齿栎林进行了为期 2 年的原位野外模拟实验，研究了变暖对土壤微生物群落季节性动态的影响。研究结果表明，变暖对生长季土壤细菌和真菌的丰富度或多样性没有显著影响，而不同的变暖梯度对非生长季的多样性有不同的影响。变暖还改变了微生物群落结构，增加了一些嗜热微生物物种的丰度，减少了一些共生微生物的丰度。微生物群落的共生网络分析表明，变暖降低了生长季和非生长季土壤细菌群落中域内网络的复杂性，但增加了真菌群落的复杂性。此外，变暖增加了生长季细菌和真菌之间的域间网络的复杂性，但在非生长季降低了复杂性，并且域间网络中的关键物种随变暖而变化。变暖还降低了微生物群落互作的正比例，表明变暖减少了微生物对土壤环境胁迫的适应过程中的共生、共栖和中性作用。影响真菌群落的因素在变暖梯度上有很大差异，细菌群落受土壤温度、MBC、NO-N 和 NH-N 的显著影响，而 SOC 和 TN 则显著影响 4°C 变暖处理下的真菌群落。这些结果表明，变暖增加了北亚热带地区土壤微生物群落多样性和复杂性的季节性差异，显著影响了全球变暖下森林生态系统调节的土壤动态过程。
