The role of plant input physical-chemical properties, and microbial and soil chemical diversity on the formation of particulate and mineral-associated organic matter

Cotrufo, M. Francesca; Haddix, Michelle L.; Kroeger, Marie E.; Stewart, Catherine E.

doi:10.1016/j.soilbio.2022.108648

Cited by 86 publications

(40 citation statements)

References 64 publications

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“…Formal quantitative estimates of plant and microbial contributions to MAOM are scarce, and those that exist suggest relative contributions are context‐ and method dependent (Table 1) (Angst et al, 2021; Ludwig et al, 2015). Growing evidence for the importance of dissolved and low molecular weight plant compounds (e.g., root exudates, litter DOC) as sources of MAOM‐C (Cotrufo et al, 2022; Craig et al, 2022; Sokol & Bradford, 2019; Villarino et al, 2021) creates uncertainty around the plant versus microbial origins of simple, low C:N compounds in MAOM. Given these uncertainties, we review data on the chemical composition of MAOM and discuss major challenges associated with determining its plant and microbial sources.…”

Section: Deciphering the Plant And Microbial Origins Of Mineral‐assoc...mentioning

confidence: 99%

Clarifying the evidence for microbial‐ and plant‐derived soil organic matter, and the path toward a more quantitative understanding

Whalen

Grandy

Sokol

et al. 2022

Global Change Biology

129

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Predicting and mitigating changes in soil carbon (C) stocks under global change requires a coherent understanding of the factors regulating soil organic matter (SOM) formation and persistence, including knowledge of the direct sources of SOM (plants vs. microbes). In recent years, conceptual models of SOM formation have emphasized the primacy of microbial-derived organic matter inputs, proposing that microbial physiological traits (e.g., growth efficiency) are dominant controls on SOM quantity.

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Section: Deciphering the Plant And Microbial Origins Of Mineral‐assoc...mentioning

confidence: 99%

Clarifying the evidence for microbial‐ and plant‐derived soil organic matter, and the path toward a more quantitative understanding

Whalen

Grandy

Sokol

et al. 2022

Global Change Biology

129

View full text Add to dashboard Cite

show abstract

“…POC is “non‐protected” nor “microaggregate‐protected”, which would provide higher C availability for microbes (Tian et al, 2017). Cotrufo et al (2022) explained that MAOC forms most efficiently from soluble plant inputs and POC forms most efficiently from decomposition; as a result, microbial diversity promotes POC but not MAOC formation. Thus, soil microbes play a relatively more important role for POC.…”

Section: Discussionmentioning

confidence: 99%

Distribution of soil bacteria involved in C cycling across extensive environmental and pedogenic gradients

Xue

Minasny

McBratney

et al. 2023

European J Soil Science

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Microorganisms play pivotal roles in soil processes. Metabolically related microorganisms constitute functional groups, and diverse microbial functional groups control nutrient cycling in soils. This study explored environmental (i.e., rainfall, temperature) and soil factors driving the distribution of bacterial functional groups involved in soil carbon (C) cycling in paired natural and agricultural ecosystems. Soil samples were collected at a regional scale covering gradients of temperature and rainfall across two orthogonal transects (~1000 km) in New South Wales, Australia. Putative functions of bacteria were linked to two soil C fractions: particulate organic carbon (POC) and mineral‐associated organic carbon (MAOC). We found: (i) temperature and rainfall were important drivers of bacterial functional groups, while soil properties, such as pH, soil C and nitrogen (N), also presented significant contributions; (ii) community structure of bacteria involved in C cycling was mainly related to POC content but not to MAOC; (iii) paired sampling showed that agricultural practices had significant impacts on the composition and responses of soil bacterial functional groups. This study demonstrated the environmental regulation (e.g., temperature and rainfall) of soil microbial functional groups at large scales, which was altered by agricultural practices. Highlights Soil bacteria involved in C cycling were investigated across two ~1000 km transects. Temperature and rainfall were important drivers of bacterial functional groups at large scale. Paired sampling showed that agriculture led to a significant shift in bacterial functional groups. Community structure of bacterial functional groups were correlated with soil POC but not MAOC.

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“…3), thus resulting in a relatively stable MAOC content. This possibility needs to be tested by conducting an isotope labeling experiment (add 13 C labeled plant material to soil) to trace the formation and loss of MAOC 22,40,53,54 in the near future. Collectively, the functional differences between POC and MAOC may lead to their divergent responses to permafrost collapse.…”

Section: Discussionmentioning

confidence: 99%

“…Of them, POC is a mixture of partially decomposed plants and their decomposition byproducts, which is vulnerable to microbial decomposition and has a short mean residence time (<10 years-decades) 18,20 . By comparison, MAOC is formed by combining small molecules of organic C leached from plants or transformed by microorganisms with soil minerals [16][17][18]21,22 . This C fraction is protected by the chemical bonds associated with minerals and belongs to the stable C component with a long-term turnover time (decadescenturies) 18 .…”

mentioning

confidence: 99%

Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

Yang

Liu²

2023

Preprint

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<p>Permafrost thaw can stimulate microbial decomposition and induce soil carbon (C) loss, potentially triggering a positive C-climate feedback. However, earlier observations have concentrated on bulk soil C dynamics upon permafrost thaw, with limited evidence involving soil C fractions. Here, we explore how the functionally distinct fractions, including particulate and mineral-associated organic C (POC and MAOC) as well as iron-bound organic C (OC-Fe), respond to permafrost thaw using systematic measurements derived from one permafrost thaw sequence and five additional thermokarst-impacted sites on the Tibetan Plateau. We find that topsoil POC content substantially decreases, while MAOC content remains stable and OC-Fe accumulates due to the enriched Fe oxides after permafrost thaw. Moreover, the proportion of MAOC and OC-Fe increases along the thaw sequence and at most of the thermokarst-impacted sites. The relatively enriched stable soil C fractions would alleviate microbial decomposition and weaken its feedback to climate warming over long-term thermokarst development.</p>

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The role of plant input physical-chemical properties, and microbial and soil chemical diversity on the formation of particulate and mineral-associated organic matter

Cited by 86 publications

References 64 publications

Clarifying the evidence for microbial‐ and plant‐derived soil organic matter, and the path toward a more quantitative understanding

Clarifying the evidence for microbial‐ and plant‐derived soil organic matter, and the path toward a more quantitative understanding

Distribution of soil bacteria involved in C cycling across extensive environmental and pedogenic gradients

Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

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