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CO2 efflux from Amazonian headwater streams represents a significant fate for deep soil respiration
Open accessAbstract
Large Amazonian rivers are known to emit substantial amounts of CO 2 to the atmosphere, while the magnitude of CO 2 degassing from small streams remains a major unknown in regional carbon budgets. We found that 77% of carbon transported by water from the landscape was as terrestrially‐respired CO 2 dissolved within soils, over 90% of which evaded to the atmosphere within headwater reaches of streams. Hydrologic transport of dissolved CO 2 was equivalent to nearly half the gaseous CO 2 contributions from deep soil (>2 m) to respiration at the soil surface. Dissolved CO 2 in emergent groundwater was isotopically consistent with soil respiration, and demonstrated strong agreement with deep soil CO 2 concentrations and seasonal dynamics. During wet seasons, deep soil (2–8 m) CO 2 concentration profiles indicated gaseous diffusion to deeper layers, thereby enhancing CO 2 drainage to streams. Groundwater discharge of CO 2 and its subsequent evasion is a significant conduit for terrestrially‐respired carbon in tropical headwater catchments.
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Cited by
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Raymond, P. A., Hartmann, J., Lauerwald, R., Sobek, S., McDonald, C., Hoover, M., Butman, D., Striegl, R., Mayorga, E., Humborg, C., et al. (2013) · Nature · doi:10.1038/nature12760 · Cited by 2,553
The Amazon basin in transition
Davidson, E. A., de Araújo, A. C., Artaxo, P., Balch, J. K., Brown, I. F., C. Bustamante, M. M., Coe, M. T., DeFries, R. S., Keller, M., Longo, M., et al. (2012) · Nature · doi:10.1038/nature10717 · Cited by 1,273
Terrestrial carbon inputs to inland waters: A current synthesis of estimates and uncertainty
Drake, T. W., Raymond, P. A., & Spencer, R. G. M. (2018) · Limnology and Oceanography Letters · doi:10.1002/lol2.10055 · Cited by 707
‘One physical system’: Tansley's ecosystem as Earth's critical zone
Richter, D. D., & Billings, S. A. (2015) · New Phytologist · doi:10.1111/nph.13338 · Cited by 221
Metadata
- Authors
- Johnson, M. S., Lehmann, J., Riha, S. J., Krusche, A. V., Richey, J. E., Ometto, J. P. H. B., & Couto, E. G.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2008-09
- Volume
- 35
- Issue
- 17
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2016102970
- Cited by
- 248
- References
- 0
- FWCI
- 6.46
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Johnson, M. S., Lehmann, J., Riha, S. J., Krusche, A. V., Richey, J. E., Ometto, J. P. H. B., & Couto, E. G. (2008). CO2 efflux from Amazonian headwater streams represents a significant fate for deep soil respiration. Geophysical Research Letters. https://doi.org/10.1029/2008gl034619
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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