A Critical Review on the Multiple Roles of Manganese in Stabilizing and Destabilizing Soil Organic Matter,Environmental Science & Technology

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A Critical Review on the Multiple Roles of Manganese in Stabilizing and Destabilizing Soil Organic Matter
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-01 , DOI: 10.1021/acs.est.1c00299
Hui Li ₁ , Fernanda Santos ₁ , Kristen Butler _{1,

2} , Elizabeth Herndon _{1,

2}

Affiliation

Manganese (Mn) is a biologically important and redox-active metal that may exert a poorly recognized control on carbon (C) cycling in terrestrial ecosystems. Manganese influences ecosystem C dynamics by mediating biochemical pathways that include photosynthesis, serving as a reactive intermediate in the breakdown of organic molecules, and binding and/or oxidizing organic molecules through organo-mineral associations. However, the potential for Mn to influence ecosystem C storage remains unresolved. Although substantial research has demonstrated the ability of Fe- and Al-oxides to stabilize organic matter, there is a scarcity of similar information regarding Mn-oxides. Furthermore, Mn-mediated reactions regulate important litter decomposition pathways, but these processes are poorly constrained across diverse ecosystems. Here, we discuss the ecological roles of Mn in terrestrial environments and synthesize existing knowledge on the multiple pathways by which biogeochemical Mn and C cycling intersect. We demonstrate that Mn has a high potential to degrade organic molecules through abiotic and microbially mediated oxidation and to stabilize organic molecules, at least temporarily, through organo-mineral associations. We outline research priorities needed to advance understanding of Mn–C interactions, highlighting knowledge gaps that may address key uncertainties in soil C predictions.

中文翻译：

锰在稳定和破坏土壤有机质中的多重作用的批判性评论

锰 (Mn) 是一种生物学上重要且具有氧化还原活性的金属，它可能对陆地生态系统中的碳 (C) 循环产生很少的控制。锰通过介导包括光合作用在内的生化途径影响生态系统 C 动态，作为有机分子分解的反应中间体，以及通过有机矿物结合结合和/或氧化有机分子。然而，Mn 影响生态系统碳储存的潜力仍未得到解决。尽管大量研究已经证明了铁氧化物和铝氧化物稳定有机物的能力，但关于锰氧化物的类似信息很少。此外，锰介导的反应调节重要的凋落物分解途径，但这些过程在不同的生态系统中受到的限制很差。这里，我们讨论了 Mn 在陆地环境中的生态作用，并综合了关于生物地球化学 Mn 和 C 循环交叉的多种途径的现有知识。我们证明 Mn 具有通过非生物和微生物介导的氧化降解有机分子和通过有机矿物结合至少暂时稳定有机分子的巨大潜力。我们概述了促进对 Mn-C 相互作用的理解所需的研究重点，突出了可能解决土壤 C 预测中关键不确定性的知识差距。我们证明 Mn 具有通过非生物和微生物介导的氧化降解有机分子和通过有机矿物结合至少暂时稳定有机分子的巨大潜力。我们概述了促进对 Mn-C 相互作用的理解所需的研究重点，突出了可能解决土壤 C 预测中关键不确定性的知识差距。我们证明 Mn 具有通过非生物和微生物介导的氧化降解有机分子和通过有机矿物结合至少暂时稳定有机分子的巨大潜力。我们概述了促进对 Mn-C 相互作用的理解所需的研究重点，突出了可能解决土壤 C 预测中关键不确定性的知识差距。

更新日期：2021-09-21

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