Deep in the Sierra Nevada critical zone: saprock represents a large terrestrial organic carbon stock

Moreland, Kimber; Tian, Zhiyuan; Berhe, Asmeret Asefaw; McFarlane, Karis J.; Hartsough, Peter; Hart, Stephen C.; Bales, Roger; O’Geen, Anthony T.

doi:10.1088/1748-9326/ac3bfe

Title: Deep in the Sierra Nevada critical zone: saprock represents a large terrestrial organic carbon stock

Journal Article · 13 December 2021 · Environmental Research Letters

DOI: https://doi.org/10.1088/1748-9326/ac3bfe · OSTI ID:1841319

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^[4]; Hartsough, Peter ^[2];

^[3]; Bales, Roger ^[3]; O’Geen, Anthony T. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry; Univ. of California, Merced, CA (United States). Sierra Nevada Research Inst.
Univ. of California, Davis, CA (United States)
Univ. of California, Merced, CA (United States). Sierra Nevada Research Inst.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Center for Accelerator Mass Spectrometry

Large uncertainty remains in the spatial distribution of deep soil organic carbon (OC) storage and how climate controls belowground OC. This research aims to quantify OC stocks, characterize soil OC age and chemical composition, and evaluate climatic impacts on OC storage from the soil surface through the deep critical zone to bedrock. These objectives were carried out at four sites along a bio-climosequence in the Sierra Nevada, California. On average, 74% of OC was stored below the A horizon, and up to 30% of OC was stored in saprock (friable weakly weathered bedrock). Radiocarbon, spectroscopic, and isotopic analyses revealed the coexistence of very old organic matter (OM) (mean radiocarbon age = 20 300 years) with relatively recent OM (mean radiocarbon age = 4800 years) and highly decomposed organic compounds with relatively less decomposed material in deep soil and saprock. This co-mingling of OM suggests OC is prone to both active cycling and long-term protection from degradation. In addition to having direct effects on OC cycling, climate indirectly controls deep OC storage through its impact on the degree of regolith weathering (e.g. thickening). Although deep OC concentrations are low relative to soil, thick saprock represents a large, previously unrealized OC pool.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1841319

Report Number(s):: LLNL-JRNL--779459; 973705

Journal Information:: Environmental Research Letters, Journal Name: Environmental Research Letters Journal Issue: 12 Vol. 16; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
carbon biogeochemistry
carbon storage
critical zone
deep soil carbon
saprock
soil carbon
weathered bedrock

Title: Deep in the Sierra Nevada critical zone: saprock represents a large terrestrial organic carbon stock

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