Interactions between minerals, oxygen, and carbon dioxide, in the critical zone

This listing contains datasets and/or DOI links to all data associated with the dissertation "Interactions between minerals, oxygen, and carbon dioxide in the critical zone" by Caitlin Hodges.

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Work Title Interactions between minerals, oxygen, and carbon dioxide, in the critical zone
Access
Open Access
Creators
  1. Caitlin Hodges
Keyword
  1. critical zone
  2. mineral weathering
  3. respiration
  4. anaerobic respiration
  5. carbon cycle
License CC BY 4.0 (Attribution)
Work Type Dataset
Acknowledgments
  1. This material is based upon work supported by the National Science Foundation under Award Numbers EAR – 1331726 to Susan L. Brantley, and EAGER SITS -1841568 to Susan L. Brantley, and the United States Department of Agriculture National Institute of Food and Agriculture Award Number 2020-67034-31716 to Caitlin Hodges. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the National Science Foundation and United States Department of Agriculture.
Publication Date August 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1594/PANGAEA.932876
  2. https://doi.org/10.5061/dryad.760jg17
Geographic Area
  1. Susquehanna Shale Hills Critical Zone Observatory
Deposited June 24, 2021

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Version 1
published

  • Created
  • Updated Keyword Show Changes
    Keyword
    • critical zone
    • critical zone, mineral weathering, respiration, anaerobic respiration, carbon cycle
  • Updated Acknowledgments Show Changes
    Acknowledgments
    • This material is based upon work supported by the National Science Foundation under Award Numbers EAR – 1331726 to Susan L. Brantley, and EAGER SITS -1841568 to Susan L. Brantley, and the United States Department of Agriculture National Institute of Food and Agriculture Award Number 2020-67034-31716 to Caitlin Hodges. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the National Science Foundation and United States Department of Agriculture.
  • Added Creator Caitlin Hodges
  • Updated Subtitle, Geographic Area, Publisher Identifier (DOI), and 1 more Show Changes
    Subtitle
    • These are the datasets associated with Caitlin Hodges's dissertation in soil science and biogeochemistry
    Geographic Area
    • Susquehanna Shale Hills Critical Zone Observatory
    Publisher Identifier (DOI)
    • https://doi.pangaea.de/10.1594/PANGAEA.932876, https://doi.org/10.5061/dryad.760jg17
    Description
    • Relationships between concentrations of soil CO2 and O2 yield insights into the dominant biotic and abiotic processes that control organic carbon mineralization and mineral weathering. Because soil CO2 production and O2 consumption are tightly coupled when aerobic respiration and diffusion persist in the soil system, the deviations from that coupling can be interpreted to signify various biotic and abiotic reactions. In this dissertation, I used such measurements to understand the mineral, hillslope, and seasonal controls on soil pCO2 relative to pO2 in three watersheds of different bedrock lithology. I made measurements over a growing season in soils of three neighboring humid, temperate watersheds underlain by three different sedimentary bedrocks – acidic shale, calcareous shale, and acidic sandstone. Across these three watersheds, I expected to observe different soil pCO2 vs. pO2 patterns. For example, in calcareous soils I anticipated to observe a greater signature of soil CO2 consumption through weathering reactions than in silicate-dominated systems. Additionally, based on prior work, I anticipated a strong metal oxidation signature in the acidic soils.
    • My results point to the control of parent material on the deviation of soil pCO2 from the theoretical values for aerobic respiration and diffusion. Chapter 2 reports the results from the two acidic parent materials. In these soils I observed a signature of seasonal metal redox cycling, with metal oxidation in the early growing season as soils drain and reoxygenate, and metal reduction in the late growing season when warm moist soils drive soil respiration rates to higher than the diffusion rate of O2. In Chapter 3 this metal redox cycling was confirmed with in situ electrochemical measurements in the valley floor of the acidic shale watershed. Using fixed potential electrodes meant to mimic the redox potential of metal oxides, I tracked iron and manganese redox rates in response to environmental drivers. This is the first time such electrodes have been used to successfully track metal redox dynamics in upland soils.
    • In Chapter 4 I report results from the calcareous watershed, where soil pCO2 and pO2 did not suggest a seasonal redox cycle. Instead, measurements indicate a consistent deficit of CO2 relative to the O2 consumed through aerobic respiration. Corresponding measurements of porewater chemistry indicate that this deficit is not solely attributable to carbonate mineral weathering, but also from consistent dissolution and transport downslope of respired CO2. I calculate that the effects of these processes can decrease soil CO2 efflux to the atmosphere by up to 35%. Such results challenge our understanding of the soil carbon cycle and call for a more thorough accounting of DIC export when constructing watershed C budgets.
    • Employing coupled pCO2 and pO2 measurements, such as those reported in this dissertation, identify where and when factors other than aerobic respiration and diffusion control C flux out of the soil. These results call for ecosystem scientists to reevaluate their past interpretations of soil CO2 flux and earth system scientists to account for lithologic heterogeneity when upscaling biogeochemical models to regional scales.
    • This listing contains datasets and/or DOI links to all data associated with the dissertation "Interactions between minerals, oxygen, and carbon dioxide in the critical zone" by Caitlin Hodges.
  • Updated Publication Date Show Changes
    Publication Date
    • 2021 - 08
    • 2021-08
  • Added 5.27.2020_combinedruns2.bin
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  • Updated Publisher Identifier (DOI), License Show Changes
    Publisher Identifier (DOI)
    • https://doi.pangaea.de/10.1594/PANGAEA.932876, https://doi.org/10.5061/dryad.760jg17
    • https://doi.org/10.1594/PANGAEA.932876, https://doi.org/10.5061/dryad.760jg17
    License
    • https://creativecommons.org/licenses/by/4.0/
  • Published
  • Updated