Details:

Journal Title:
Geophysical Research Letters
Personal Author:
Luk, Sheron Y. ; Todd‐Brown, Katherine ; Eagle, Meagan ; McNichol, Ann P. ; Sanderman, Jonathan ; ... More +
Luk, Sheron Y. ; Todd‐Brown, Katherine ; Eagle, Meagan ; McNichol, Ann P. ; Sanderman, Jonathan ; Gosselin, Kelsey ; Spivak, Amanda C. Less -
NOAA Program & Office:
NOS (National Ocean Service) ; OCM (Office for Coastal Management) ; OAR (Oceanic and Atmospheric Research)
NOS (National Ocean Service) ; OCM (Office for Coastal Management) ; OAR (Oceanic and Atmospheric Research) Less -
Description:
Salt marsh survival with sea-level rise (SLR) increasingly relies on soil organic carbon (SOC) accumulation and preservation. Using a novel combination of geochemical approaches, we characterized fine SOC (≤1 mm) supporting marsh elevation maintenance. Overlaying thermal reactivity, source (δ13C), and age (F14C) information demonstrates several processes contributing to soil development: marsh grass production, redeposition of eroded material, and microbial reworking. Redeposition of old carbon, likely from creekbanks, represented ∼9%–17% of shallow SOC (≤26 cm). Soils stored marsh grass-derived compounds with a range of reactivities that were reworked over centuries-to-millennia. Decomposition decreases SOC thermal reactivity throughout the soil column while the decades-long disturbance of ponding accelerated this shift in surface horizons. Empirically derived estimates of SOC turnover based on geochemical composition spanned a wide range (640–9,951 years) and have the potential to inform predictions of marsh ecosystem evolution.
Keywords:
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Carbon Salt Marshes Decomposition Soil Organic Carbon
Source:
Geophysical Research Letters, 48, e2020GL090287
DOI:
https://doi.org/10.1029/2020GL090287
Document Type:
Journal Article
Funding:
Grant no. NA14NOS4190145 ; Grant no. NA14OAR4170104
Grant no. NA14NOS4190145 ; Grant no. NA14OAR4170104 Less -
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:c062d5a4c27d0dc0788cfd1d80f31e121e6b1de5f1dcf30d49deb2150bb2cb2e
Download URL:
https://repository.library.noaa.gov/view/noaa/34005/noaa_34005_DS1.pdf
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