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Dynamic interactions at the mineral–organic matter interface
Nature Reviews Earth & Environment ( IF 42.1 ) Pub Date : 2021-05-11 , DOI: 10.1038/s43017-021-00162-y
Markus Kleber , Ian C. Bourg , Elizabeth K. Coward , Colleen M. Hansel , Satish C. B. Myneni , Naoise Nunan

Minerals are widely assumed to protect organic matter (OM) from degradation in the environment, promoting the persistence of carbon in soil and sediments. In this Review, we describe the mechanisms and processes operating at the mineral–organic interface as they relate to OM transformation dynamics. A broad set of interactions occur, with minerals adsorbing organic compounds to their surfaces and/or acting as catalysts for organic reactions. Minerals can serve as redox partners for OM through direct electron transfer or by generating reactive oxygen species, which then oxidize OM. Finally, the compartmentalization of soil and sediment by minerals creates unique microsites that host diverse microbial communities. Acknowledgement of this multiplicity of interactions suggests that the general assumption that the mineral matrix provides a protective function for OM is overly simplistic. Future work must recognize adsorption as a condition for further reactions instead of as a final destination for organic adsorbates, and should consider the spatial and functional complexity that is characteristic of the environments where mineral–OM interactions are observed.



中文翻译:

矿物-有机物界面的动态相互作用

人们广泛认为矿物可以保护有机物(OM)免受环境降解,从而促进碳在土壤和沉积物中的持久性。在本综述中,我们描述了与有机物转化动力学相关的在矿物-有机界面上运行的机制和过程。发生广泛的相互作用,矿物将有机化合物吸附到其表面和/或充当有机反应的催化剂。矿物质可以通过直接电子转移或生成活性氧来充当OM的氧化还原伴侣,然后氧化OM。最后,矿物对土壤和沉积物的分隔将产生独特的微场所,这些微场所承载着各种微生物群落。对这种相互作用的多重性的承认表明,矿物基体为OM提供保护功能的一般假设过于简单。未来的工作必须认识到吸附是进一步反应的条件,而不是有机吸附物的最终目的地,并且应考虑到观察到矿物-OM相互作用的环境所特有的空间和功能复杂性。

更新日期:2021-05-11
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