Depth profiles of soil organic carbon isotopes across a lithosequence: implications for drivers of soil δ 13C vertical changes
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Depth profiles of soil organic carbon isotopes across a lithosequence : implications for drivers of soil δ 13C vertical changes. / Karimi Nezhad, Mohammad Tahsin; Bruun, Sander; Magid, Jakob.
In: Isotopes in Environmental and Health Studies, Vol. 58, No. 2, 2022, p. 159-179.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Depth profiles of soil organic carbon isotopes across a lithosequence
T2 - implications for drivers of soil δ 13C vertical changes
AU - Karimi Nezhad, Mohammad Tahsin
AU - Bruun, Sander
AU - Magid, Jakob
N1 - Publisher Copyright: © 2022 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2022
Y1 - 2022
N2 - To addresshow parent materials are affecting organic carbon dynamics in a soil profile, soils from a lithosequence comprising six parent lithologies under a rangeland ecosystem have been explored at three depth intervals for soil organic carbon (SOC) content and its 13C depth trends. Studied parent materials ranged from metamorphic (foliated: FM and non-foliated: NFM) to sedimentary (clastic carbonate: CCS) to plutonic (intermediate: IP, felsic: FP and intermediate felsic: IFP) geological contexts. The relationship between SOC concentration and its isotopic signatures to a depth of 50 cm in FM, NFM, FP and IFP profiles was well described by the kinetic fractionation of SOC during biodegradation. For CCS and IP lithologies, strong divergence from the Rayleigh equation was observed suggesting that the 13C enrichments in these soils resulted from both mixing different SOC pools and isotope fractionation related to the C mineralization. Results suggest that SOC across the lithosequence goes through different isotopic evolutions resulting from different 13C-enriched inputs and pedogenic properties as described by the extended Rayleigh equation (0 ≤ β C≤ 0.80). These are presumably caused by the bedrock lithology implying that parent material affects C storage and dynamics.
AB - To addresshow parent materials are affecting organic carbon dynamics in a soil profile, soils from a lithosequence comprising six parent lithologies under a rangeland ecosystem have been explored at three depth intervals for soil organic carbon (SOC) content and its 13C depth trends. Studied parent materials ranged from metamorphic (foliated: FM and non-foliated: NFM) to sedimentary (clastic carbonate: CCS) to plutonic (intermediate: IP, felsic: FP and intermediate felsic: IFP) geological contexts. The relationship between SOC concentration and its isotopic signatures to a depth of 50 cm in FM, NFM, FP and IFP profiles was well described by the kinetic fractionation of SOC during biodegradation. For CCS and IP lithologies, strong divergence from the Rayleigh equation was observed suggesting that the 13C enrichments in these soils resulted from both mixing different SOC pools and isotope fractionation related to the C mineralization. Results suggest that SOC across the lithosequence goes through different isotopic evolutions resulting from different 13C-enriched inputs and pedogenic properties as described by the extended Rayleigh equation (0 ≤ β C≤ 0.80). These are presumably caused by the bedrock lithology implying that parent material affects C storage and dynamics.
KW - Carbon-13
KW - depth profiles
KW - isotope geochemistry
KW - isotopic evolution
KW - kinetic fractionation
KW - lithology
KW - Rayleigh distillation
KW - soil organic carbon
U2 - 10.1080/10256016.2022.2044806
DO - 10.1080/10256016.2022.2044806
M3 - Journal article
C2 - 35238693
AN - SCOPUS:85126057349
VL - 58
SP - 159
EP - 179
JO - Isotopes in Environmental and Health Studies
JF - Isotopes in Environmental and Health Studies
SN - 1025-6016
IS - 2
ER -
ID: 300452267