The role of wetland microorganisms in plant-litter decomposition and soil organic matter formation: a critical review

FEMS Microbiology Ecology
Stephanie A Yarwood

Abstract

New soil organic matter (SOM) models highlight the role of microorganisms in plant litter decomposition and storage of microbial-derived carbon (C) molecules. Wetlands store more C per unit area than any other ecosystem, but SOM storage mechanisms such as aggregation and metal complexes are mostly untested in wetlands. This review discusses what is currently known about the role of microorganisms in SOM formation and C sequestrations, as well as, measures of microbial communities as they relate to wetland C cycling. Studies within the last decade have yielded new insights about microbial communities. For example, microbial communities appear to be adapted to short-term fluctuations in saturation and redox and researchers have observed synergistic pairings that in some cases run counter to thermodynamic theory. Significant knowledge gaps yet to be filled include: (i) What controls microbial access to and decomposition of plant litter and SOM? (ii) How does microbial community structure shape C fate, across different wetland types? (iii) What types of plant and microbial molecules contribute to SOM accumulation? Studies examining the active microbial community directly or that utilize multi-pronged approaches are shedding new lig...Continue Reading

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Citations

Aug 22, 2021·The Science of the Total Environment·Morimaru KidaNobuhide Fujitake

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