土壤碳
非生物成分
环境科学
生物地球化学
碳循环
垃圾箱
植物凋落物
土壤生物学
土壤质量
生态学
土壤有机质
生态系统
生物
土壤科学
土壤水分
作者
Matthew E. Craig,Kevin M. Geyer,Katilyn V. Beidler,Edward Brzostek,Serita D. Frey,A. Stuart Grandy,Chao Liang,Richard P. Phillips
标识
DOI:10.1038/s41467-022-28715-9
摘要
Conceptual and empirical advances in soil biogeochemistry have challenged long-held assumptions about the role of soil micro-organisms in soil organic carbon (SOC) dynamics; yet, rigorous tests of emerging concepts remain sparse. Recent hypotheses suggest that microbial necromass production links plant inputs to SOC accumulation, with high-quality (i.e., rapidly decomposing) plant litter promoting microbial carbon use efficiency, growth, and turnover leading to more mineral stabilization of necromass. We test this hypothesis experimentally and with observations across six eastern US forests, using stable isotopes to measure microbial traits and SOC dynamics. Here we show, in both studies, that microbial growth, efficiency, and turnover are negatively (not positively) related to mineral-associated SOC. In the experiment, stimulation of microbial growth by high-quality litter enhances SOC decomposition, offsetting the positive effect of litter quality on SOC stabilization. We suggest that microbial necromass production is not the primary driver of SOC persistence in temperate forests. Factors such as microbial necromass origin, alternative SOC formation pathways, priming effects, and soil abiotic properties can strongly decouple microbial growth, efficiency, and turnover from mineral-associated SOC.
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