School of Ecology and Northeast Asia Biodiversity Research Center, Northeast Forestry University, Harbin, Heilongjiang, China.
Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education Northeast Forestry University, Harbin, Heilongjiang, China.
Nat Commun. 2024 Nov 2;15(1):9472. doi: 10.1038/s41467-024-53753-w.
Soil microbial growth, a vital biogeochemical process, governs both the accrual and loss of soil carbon. Here, we investigate the biogeography of soil microbiome potential growth rates and show that microbiomes in resource-rich (high organic matter and nutrients) and acid-neutral soils from cold and humid regions exhibit high potential growth. Conversely, in resource-poor, dry, hot, and hypersaline soils, soil microbiomes display lower potential growth rates, suggesting trade-offs between growth and resource acquisition or stress tolerance. In addition, the potential growth rates of soil microbiomes positively correlates with genome size and the number of ribosomal RNA operons but negatively correlates with optimum temperature, biomass carbon-to-phosphorus and nitrogen-to-phosphorus ratios. The spatial variation of microbial potential growth rates aligns with several macroecological theories. These findings not only enhance our understanding of microbial adaptation to diverse environments but also aid in realistically parameterizing microbial physiology in soil carbon cycling models.
土壤微生物生长是一种重要的生物地球化学过程，控制着土壤碳的积累和损失。在这里，我们研究了土壤微生物组潜在生长速率的生物地理学，并表明来自寒冷和潮湿地区的富营养（高有机质和养分）和中性土壤的微生物组具有很高的潜在生长能力。相反，在资源贫瘠、干燥、炎热和高盐土壤中，土壤微生物组显示出较低的潜在生长速率，这表明生长与资源获取或应激耐受之间存在权衡。此外，土壤微生物组的潜在生长速率与基因组大小和核糖体 RNA 操纵子数量呈正相关，但与最适温度、生物质碳磷比和氮磷比呈负相关。微生物潜在生长速率的空间变化与几种宏观生态学理论一致。这些发现不仅增强了我们对微生物适应不同环境的理解，还有助于在土壤碳循环模型中真实地参数化微生物生理学。
