Soil properties and sediment accretion modulate methane fluxes from restored wetlands
Abstract
Wetlands are the largest source of methane (CH4) globally, yet our understanding of how process-level controls scale to ecosystem fluxes remains limited. It is particularly uncertain how variable soil properties influence ecosystem CH4 emissions on annual time scales. Here. we measured ecosystem carbon dioxide (CO2) and CH4 fluxes by eddy covariance from two wetlands recently restored on peat and alluvium soils within the Sacramento–San Joaquin Delta of California. Annual CH4 fluxes from the alluvium wetland were significantly lower than the peat site for multiple years following restoration, but these differences were not explained by variation in dominant climate drivers or productivity across wetlands. Soil iron (Fe) concentrations were significantly higher in alluvium soils, and alluvium CH4 fluxes were decoupled from plant processes compared with the peat site, as expected when Fe reduction inhibits CH4 production in the rhizosphere. Soil carbon content and CO2 uptake rates did not vary across wetlands and, thus, could also be ruled out as drivers of initial CH4 flux differences. Differences in wetland CH4 fluxes across soil types were transient; alluvium wetland fluxes were similar to peat wetland fluxes 3 years after restoration. Changing alluvium CH4 emissions with time could not be explained by an empirical modelmore »
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- California State Univ., East Bay, Hayward, CA (United States)
- National Ecological Observatory Network, Boulder, CO (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); California Dept. of Water Resources
- OSTI Identifier:
- 1477371
- Grant/Contract Number:
- AC02-05CH11231; 4600011240
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Global Change Biology
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1354-1013
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; 54 ENVIRONMENTAL SCIENCES; alternative electron acceptor; carbon flux; eddy covariance; greenhouse gas balance; information theory; peatland; redox; Sacramento–San Joaquin Delta
Citation Formats
Chamberlain, Samuel D., Anthony, Tyler L., Silver, Whendee L., Eichelmann, Elke, Hemes, Kyle S., Oikawa, Patricia Y., Sturtevant, Cove, Szutu, Daphne J., Verfaillie, Joseph G., and Baldocchi, Dennis D. Soil properties and sediment accretion modulate methane fluxes from restored wetlands. United States: N. p., 2018.
Web. doi:10.1111/gcb.14124.
Chamberlain, Samuel D., Anthony, Tyler L., Silver, Whendee L., Eichelmann, Elke, Hemes, Kyle S., Oikawa, Patricia Y., Sturtevant, Cove, Szutu, Daphne J., Verfaillie, Joseph G., & Baldocchi, Dennis D. Soil properties and sediment accretion modulate methane fluxes from restored wetlands. United States. https://doi.org/10.1111/gcb.14124
Chamberlain, Samuel D., Anthony, Tyler L., Silver, Whendee L., Eichelmann, Elke, Hemes, Kyle S., Oikawa, Patricia Y., Sturtevant, Cove, Szutu, Daphne J., Verfaillie, Joseph G., and Baldocchi, Dennis D. Wed .
"Soil properties and sediment accretion modulate methane fluxes from restored wetlands". United States. https://doi.org/10.1111/gcb.14124. https://www.osti.gov/servlets/purl/1477371.
@article{osti_1477371,
title = {Soil properties and sediment accretion modulate methane fluxes from restored wetlands},
author = {Chamberlain, Samuel D. and Anthony, Tyler L. and Silver, Whendee L. and Eichelmann, Elke and Hemes, Kyle S. and Oikawa, Patricia Y. and Sturtevant, Cove and Szutu, Daphne J. and Verfaillie, Joseph G. and Baldocchi, Dennis D.},
abstractNote = {Wetlands are the largest source of methane (CH4) globally, yet our understanding of how process-level controls scale to ecosystem fluxes remains limited. It is particularly uncertain how variable soil properties influence ecosystem CH4 emissions on annual time scales. Here. we measured ecosystem carbon dioxide (CO2) and CH4 fluxes by eddy covariance from two wetlands recently restored on peat and alluvium soils within the Sacramento–San Joaquin Delta of California. Annual CH4 fluxes from the alluvium wetland were significantly lower than the peat site for multiple years following restoration, but these differences were not explained by variation in dominant climate drivers or productivity across wetlands. Soil iron (Fe) concentrations were significantly higher in alluvium soils, and alluvium CH4 fluxes were decoupled from plant processes compared with the peat site, as expected when Fe reduction inhibits CH4 production in the rhizosphere. Soil carbon content and CO2 uptake rates did not vary across wetlands and, thus, could also be ruled out as drivers of initial CH4 flux differences. Differences in wetland CH4 fluxes across soil types were transient; alluvium wetland fluxes were similar to peat wetland fluxes 3 years after restoration. Changing alluvium CH4 emissions with time could not be explained by an empirical model based on dominant CH4 flux biophysical drivers, suggesting that other factors, not measured by our eddy covariance towers, were responsible for these changes. Recently accreted alluvium soils were less acidic and contained more reduced Fe compared with the pre-restoration parent soils, suggesting that CH4 emissions increased as conditions became more favorable to methanogenesis within wetland sediments. This study suggests that alluvium soil properties, likely Fe content, are capable of inhibiting ecosystem-scale wetland CH4 flux, but these effects appear to be transient without continued input of alluvium to wetland sediments.},
doi = {10.1111/gcb.14124},
journal = {Global Change Biology},
number = 9,
volume = 24,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
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