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³⁶Cl, a new tool to assess soil carbon dynamics.

ABSTRACT: Soil organic carbon is one of the largest surface pools of carbon that humans can manage in order to partially mitigate annual anthropogenic CO₂ emissions. A significant element to assess soil sequestration potential is the carbon age, which is evaluated by modelling or experimentally using carbon isotopes. Results, however, are not consistent. The ¹⁴C derived approach seems to overestimate by a factor of 6-10 the average carbon age in soils estimated by modeling and ¹³C approaches and thus the sequestration potential. A fully independent method is needed. The cosmogenic chlorine nuclide, ³⁶Cl, is a potential alternative. ³⁶Cl is a naturally occurring cosmogenic radionuclide with a production that increased by three orders of magnitude during nuclear bomb tests. Part of this production is retained by soil organic matter in organochloride form and hence acts as a tracer of the fate of soil organic carbon. We here quantify the fraction and the duration of ³⁶Cl retained in the soil and we show that retention time increases with depth from 20 to 322 years, in agreement with both modelling and ¹³C-derived estimates. This work demonstrates that ³⁶Cl retention duration can be a proxy for the age of soil organic carbon.

SUBMITTER: Grapeloup C

PROVIDER: S-EPMC10497631 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature

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36Cl, a new tool to assess soil carbon dynamics.

Grapeloup Cécile C Cornu Sophie S Giraud Xavier X Pupier Julie J Team Aster A Guillou Valery V Ciffroy Philippe P Cabana Beatriz Lourino BL Couegnas Cécile C Hatté Christine C Benedetti Lucilla L

Scientific reports 20230912 1

Soil organic carbon is one of the largest surface pools of carbon that humans can manage in order to partially mitigate annual anthropogenic CO2 emissions. A significant element to assess soil sequestration potential is the carbon age, which is evaluated by modelling or experimentally using carbon isotopes. Results, however, are not consistent. The 14C derived approach seems to overestimate by a factor of 6-10 the average carbon age in soils estimated by modeling and 1 ...[more]

PMID: 37699917

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Project description:Returning crop residues is a possible practice for balancing soil carbon (C) loss. The turnover rate of organic C from crop residues to soil C is dependent on soil microbial community dynamics. However, the relationship between any temporal changes in the soil microbial community after crop straw inputs and the dynamics of straw-C distribution in the soil organic carbon (SOC) pool remains unclear. The present study investigated the allocation of straw-C into soil dissolved organic carbon (DOC), microbial biomass carbon (MBC), particulate organic carbon (POC) and mineral-associated organic carbon (MaOC) using stable isotope probing, as well as the temporal changes in the soil bacterial and fungal communities using high-throughput sequencing. After the first 180 days of straw decomposition, approximately 3.93% and 19.82% of straw-C was transformed into soil MaOC and POC, respectively, while 0.02% and 2.25% of straw-C was transformed into soil DOC and MBC, respectively. The temporal change of the soil microbial community was positively correlated with the dynamics of straw-C distribution to SOC (R > 0.5, P < 0.05). The copiotrophic bacteria (e.g., Streptomyces, Massilia and Sphingobacterium), cellulolytic bacteria and fungi (e.g., Dyella and Fusarium, Talaromyces), acidophilic bacteria (e.g., Edaphobacter and unclassified Acidobacteriaceae), denitrifying and N-fixing microbes (e.g., Burkholderia-Paraburkholderia, Paraphaeosphaeria and Bradyrhizobium), and fungi unclassified Sordariomycetes were significantly correlated with straw-C distribution to specific SOC fractions (P < 0.05), which explained more than 90% of the variation of straw-C allocation into soils. Copiotrophic, certain cellulolytic and denitrifying microbes had positively correlated with DOC- and MaOC-derived from straw, and other cellulolytic fungi (e.g., Talaromyces) and specific bacteria (e.g. Bradyrhizobium) were positively correlated with POC-derived from straw. Our results highlight that the temporal change of soil microbial community structure well reflects the conversion and distribution process of straw-C to SOC fractions.

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³⁶Cl, a new tool to assess soil carbon dynamics.

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<sup>36</sup>Cl, a new tool to assess soil carbon dynamics.

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