自行车
呼吸
碳循环
矿物
环境化学
化学
土壤碳
有机质
土壤呼吸
碳纤维
土壤水分
矿化(土壤科学)
土壤科学
生态学
环境科学
植物
生态系统
生物
材料科学
历史
考古
有机化学
复合数
复合材料
作者
Guopeng Liang,John Stark,Bonnie G. Waring
标识
DOI:10.1038/s41467-023-40768-y
摘要
Abstract Modern conceptual models of soil organic carbon (SOC) cycling focus heavily on the microbe-mineral interactions that regulate C stabilization. However, the formation of ‘stable’ (i.e. slowly cycling) soil organic matter, which consists mainly of microbial residues associated with mineral surfaces, is inextricably linked to C loss through microbial respiration. Therefore, what is the net impact of microbial metabolism on the total quantity of C held in the soil? To address this question, we constructed artificial root-soil systems to identify controls on C cycling across the plant-microbe-mineral continuum, simultaneously quantifying the formation of mineral-associated C and SOC losses to respiration. Here we show that root exudates and minerals interacted to regulate these processes: while roots stimulated respiratory C losses and depleted mineral-associated C pools in low-activity clays, root exudates triggered formation of stable C in high-activity clays. Moreover, we observed a positive correlation between the formation of mineral-associated C and respiration. This suggests that the growth of slow-cycling C pools comes at the expense of C loss from the system.
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