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Stabilisation of soil organic matter: interactions between clay and microbes
Biogeochemistry ( IF 4 ) Pub Date : 2022-07-25 , DOI: 10.1007/s10533-022-00956-2
Md. Rumainul Islam, Balwant Singh, Feike A. Dijkstra

Soil organic matter (SOM) plays a central role in the global carbon balance and in mitigating climate change. It will therefore be important to understand mechanisms of SOM decomposition and stabilisation. SOM stabilisation is controlled by biotic factors, such as the efficiency by which microbes use and produce organic compounds varying in chemistry, but also by abiotic factors, such as adsorption of plant- and microbially-derived organic matter onto soil minerals. Indeed, the physicochemical adsorption of organic matter onto soil minerals, forming mineral associated organic matter (MAOM), is one of the significant processes for SOM stabilisation. We integrate existing frameworks of SOM stabilisation and illustrate how microbial control over SOM stabilisation interacts with soil minerals. In our new integrated framework, we emphasise the interplay between substrate characteristics and the abundance of active clay surfaces on microbial processes such as carbon use efficiency and recycling. We postulate that microbial use and recycling of plant- and microbially-derived substrates decline with increased abundance of active clay surfaces, and that the shape of these relationships depend on the affinity of each substrate to adsorb, thereby affecting the efficiency by which organic matter remains in the soil and is stabilised into MAOM. Our framework provides avenues for novel research and ideas to incorporate interactions between clay surfaces and microbes on SOM stabilisation in biogeochemical models.

Graphical abstract



中文翻译:

土壤有机质的稳定:粘土和微生物之间的相互作用

土壤有机质 (SOM) 在全球碳平衡和减缓气候变化方面发挥着核心作用。因此,了解 SOM 分解和稳定的机制非常重要。SOM 稳定性受生物因素控制,例如微生物使用和产生化学上不同的有机化合物的效率,但也受非生物因素控制,例如植物和微生物衍生的有机物吸附到土壤矿物质上。事实上,有机质在土壤矿物质上的物理化学吸附,形成矿物相关有机质(MAOM),是稳定土壤有机质的重要过程之一。我们整合了现有的 SOM 稳定框架,并说明了对 SOM 稳定的微生物控制如何与土壤矿物质相互作用。在我们新的集成框架中,我们强调基质特性与活性粘土表面丰富度对微生物过程(如碳利用效率和循环利用)之间的相互作用。我们假设,随着活性粘土表面丰度的增加,微生物对植物和微生物衍生基质的利用和再循环会下降,并且这些关系的形状取决于每种基质对吸附的亲和力,从而影响有机物残留的效率在土壤中并稳定成 MAOM。我们的框架为新的研究和想法提供了途径,以将粘土表面和微生物之间的相互作用纳入生物地球化学模型中的 SOM 稳定性。我们假设,随着活性粘土表面丰度的增加,微生物对植物和微生物衍生基质的利用和再循环会下降,并且这些关系的形状取决于每种基质对吸附的亲和力,从而影响有机物残留的效率在土壤中并稳定成 MAOM。我们的框架为新的研究和想法提供了途径,以将粘土表面和微生物之间的相互作用纳入生物地球化学模型中的 SOM 稳定性。我们假设,随着活性粘土表面丰度的增加,微生物对植物和微生物衍生基质的利用和再循环会下降,并且这些关系的形状取决于每种基质对吸附的亲和力,从而影响有机物残留的效率在土壤中并稳定成 MAOM。我们的框架为新的研究和想法提供了途径,以将粘土表面和微生物之间的相互作用纳入生物地球化学模型中的 SOM 稳定性。

图形概要

更新日期:2022-07-26
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