Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective
Soil organic matter (SOM) is the largest actively cycling reservoir of terrestrial carbon (C), and the majority of SOM in Earth's mineral soils (~65%) is mineral-associated organic matter (MAOM). Thus, the formation and fate of MAOM can exert substantial influence on the global C cycle. To pred...
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ftosti:oai:osti.gov:1886131 2023-07-30T04:07:21+02:00 Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective Sokol, Noah W. Whalen, Emily D. Jilling, Andrea Kallenbach, Cynthia Pett‐Ridge, Jennifer Georgiou, Katerina 2023-07-10 application/pdf http://www.osti.gov/servlets/purl/1886131 https://www.osti.gov/biblio/1886131 https://doi.org/10.1111/1365-2435.14040 unknown http://www.osti.gov/servlets/purl/1886131 https://www.osti.gov/biblio/1886131 https://doi.org/10.1111/1365-2435.14040 doi:10.1111/1365-2435.14040 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1111/1365-2435.14040 2023-07-11T10:14:40Z Soil organic matter (SOM) is the largest actively cycling reservoir of terrestrial carbon (C), and the majority of SOM in Earth's mineral soils (~65%) is mineral-associated organic matter (MAOM). Thus, the formation and fate of MAOM can exert substantial influence on the global C cycle. To predict future changes to Earth's climate, it is critical to mechanistically understand the processes by which MAOM is formed and decomposed, and to accurately represent this process-based understanding in biogeochemical and Earth system models. In this review, we use a trait-based framework to synthesize the interacting roles of plants, soil micro-organisms, and the mineral matrix in regulating MAOM formation and decomposition. Our proposed framework differentiates between plant and microbial traits that influence total OM inputs to the soil (‘feedstock traits’) versus traits that influence the proportion of OM inputs that are ultimately incorporated into MAOM (‘MAOM formation traits’). We discuss how these feedstock and MAOM formation traits may be altered by warming, altered precipitation and elevated carbon dioxide. At a planetary scale, these feedstock and MAOM formation traits help shape the distribution of MAOM across Earth's biomes, and modulate biome-specific responses of MAOM to climate change. We leverage a global synthesis of MAOM measurements to provide estimates of the total amount of MAOM-C globally (~840–1540 Pg C; 34%–51% of total terrestrial organic C), and its distribution across Earth's biomes. We show that MAOM-C concentration is highest in temperate forests and grasslands, and lowest in shrublands and savannas. Grasslands and croplands have the highest proportion of soil organic carbon (SOC) in the MAOM fraction (i.e. the MAOM-C:SOC ratio), while boreal forests and tundra have the lowest MAOM-C:SOC ratio. Drawing on our trait framework, we then review experimental data and posit the effects of climate change on MAOM pools in different biomes. We conclude by discussing how MAOM is integrated into soil C ... Other/Unknown Material Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Functional Ecology 36 6 1411 1429 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Sokol, Noah W. Whalen, Emily D. Jilling, Andrea Kallenbach, Cynthia Pett‐Ridge, Jennifer Georgiou, Katerina Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Soil organic matter (SOM) is the largest actively cycling reservoir of terrestrial carbon (C), and the majority of SOM in Earth's mineral soils (~65%) is mineral-associated organic matter (MAOM). Thus, the formation and fate of MAOM can exert substantial influence on the global C cycle. To predict future changes to Earth's climate, it is critical to mechanistically understand the processes by which MAOM is formed and decomposed, and to accurately represent this process-based understanding in biogeochemical and Earth system models. In this review, we use a trait-based framework to synthesize the interacting roles of plants, soil micro-organisms, and the mineral matrix in regulating MAOM formation and decomposition. Our proposed framework differentiates between plant and microbial traits that influence total OM inputs to the soil (‘feedstock traits’) versus traits that influence the proportion of OM inputs that are ultimately incorporated into MAOM (‘MAOM formation traits’). We discuss how these feedstock and MAOM formation traits may be altered by warming, altered precipitation and elevated carbon dioxide. At a planetary scale, these feedstock and MAOM formation traits help shape the distribution of MAOM across Earth's biomes, and modulate biome-specific responses of MAOM to climate change. We leverage a global synthesis of MAOM measurements to provide estimates of the total amount of MAOM-C globally (~840–1540 Pg C; 34%–51% of total terrestrial organic C), and its distribution across Earth's biomes. We show that MAOM-C concentration is highest in temperate forests and grasslands, and lowest in shrublands and savannas. Grasslands and croplands have the highest proportion of soil organic carbon (SOC) in the MAOM fraction (i.e. the MAOM-C:SOC ratio), while boreal forests and tundra have the lowest MAOM-C:SOC ratio. Drawing on our trait framework, we then review experimental data and posit the effects of climate change on MAOM pools in different biomes. We conclude by discussing how MAOM is integrated into soil C ... |
author |
Sokol, Noah W. Whalen, Emily D. Jilling, Andrea Kallenbach, Cynthia Pett‐Ridge, Jennifer Georgiou, Katerina |
author_facet |
Sokol, Noah W. Whalen, Emily D. Jilling, Andrea Kallenbach, Cynthia Pett‐Ridge, Jennifer Georgiou, Katerina |
author_sort |
Sokol, Noah W. |
title |
Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
title_short |
Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
title_full |
Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
title_fullStr |
Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
title_full_unstemmed |
Global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: A trait-based perspective |
title_sort |
global distribution, formation and fate of mineral-associated soil organic matter under a changing climate: a trait-based perspective |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1886131 https://www.osti.gov/biblio/1886131 https://doi.org/10.1111/1365-2435.14040 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
http://www.osti.gov/servlets/purl/1886131 https://www.osti.gov/biblio/1886131 https://doi.org/10.1111/1365-2435.14040 doi:10.1111/1365-2435.14040 |
op_doi |
https://doi.org/10.1111/1365-2435.14040 |
container_title |
Functional Ecology |
container_volume |
36 |
container_issue |
6 |
container_start_page |
1411 |
op_container_end_page |
1429 |
_version_ |
1772820611243966464 |