Smart Mixture Design Can Steer the Fate of Root‐Derived Carbon Into Mineral‐Associated and Particulate Organic Matter in Intensively Managed Grasslands DOI Creative Commons
Esben Øster Mortensen, Diego Ábalos, Tine Engedal

et al.

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(3)

Published: March 1, 2025

Species choice and richness in intensively managed grassland mixtures regulate soil carbon (C) input via rhizodeposition, with potential consequences for long-term organic storage. Based on a field trial different grass-legume-forb mixtures, we removed roots from the soil, which was then subjected to particle-size fractionation trace fresh (net C rhizodeposition) into particulate matter (POM) mineral-associated (MAOM). We related these fractions root traits. Using multiple-pulse 13C-CO2-labeling, captured net formation of (MAOC) (POC) at end growing season. Pure stand perennial ryegrass (Lolium perenne) had higher quantities rhizodeposited allocated MAOC POC (0.21 0.13 g kg-1 dry respectively) compared (ranging 0.10 0.12 0.05 0.06 POC). However, proportion (%MAOC relation that legumes. did not affect quantity or POC, nor %MAOC. The were positively associated length. In contrast, %MAOC diameter lower C:N ratio. Despite legumes, main driver total amount rhizodeposition. These results highlight importance legumes rhizodeposition high length increasing both quantities. Our study shows how plant community design can be used increase and/or facilitate By revealing traits behind relationships between communities formation, provide guide species selection grasslands mitigate climate change.

Language: Английский

Smart Mixture Design Can Steer the Fate of Root‐Derived Carbon Into Mineral‐Associated and Particulate Organic Matter in Intensively Managed Grasslands DOI Creative Commons
Esben Øster Mortensen, Diego Ábalos, Tine Engedal

et al.

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(3)

Published: March 1, 2025

Species choice and richness in intensively managed grassland mixtures regulate soil carbon (C) input via rhizodeposition, with potential consequences for long-term organic storage. Based on a field trial different grass-legume-forb mixtures, we removed roots from the soil, which was then subjected to particle-size fractionation trace fresh (net C rhizodeposition) into particulate matter (POM) mineral-associated (MAOM). We related these fractions root traits. Using multiple-pulse 13C-CO2-labeling, captured net formation of (MAOC) (POC) at end growing season. Pure stand perennial ryegrass (Lolium perenne) had higher quantities rhizodeposited allocated MAOC POC (0.21 0.13 g kg-1 dry respectively) compared (ranging 0.10 0.12 0.05 0.06 POC). However, proportion (%MAOC relation that legumes. did not affect quantity or POC, nor %MAOC. The were positively associated length. In contrast, %MAOC diameter lower C:N ratio. Despite legumes, main driver total amount rhizodeposition. These results highlight importance legumes rhizodeposition high length increasing both quantities. Our study shows how plant community design can be used increase and/or facilitate By revealing traits behind relationships between communities formation, provide guide species selection grasslands mitigate climate change.

Language: Английский

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