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Title: The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica

Abstract

In the tropical rainforest at La Selva Biological Station in Costa Rica, regional bedrock groundwater high in dissolved carbon discharges into some streams and wetlands, with the potential for multiple cascading effects on ecosystem carbon pools and fluxes. We investigated carbon dioxide (CO 2) and methane (CH 4) degassing from two streams at La Selva: the Arboleda, where ~1/3 of the streamflow is from regional groundwater, and the Taconazo, fed exclusively by local groundwater recharged within the catchment. The regional groundwater inflow to the Arboleda had no measurable effect on stream gas exchange velocity, dissolved CH 4 concentration, or CH 4 emissions but significantly increased stream CO 2 concentration and degassing. CO 2 evasion from the reach of the Arboleda receiving regional groundwater (lower Arboleda) averaged 5.5 mol C m -2 d -1, ~7.5x higher than the average (0.7 mol C m -2 d -1) from the stream reaches with no regional groundwater inflow (the Taconazo and upper Arboleda). Carbon emissions from both streams were dominated by CO 2; CH 4 accounted for only 0.06-1.70% of the total (average of both streams: 5 x10 -3 mol C m -2 d -1). Annual stream degassing fluxes normalized by watershed area weremore » 48 and 299 g C m -2 for the Taconazo and Arboleda, respectively. CO 2 degassing from the Arboleda is a significant carbon flux, similar in magnitude to the average net ecosystem exchange estimated by eddy covariance. As a result, examining the effects of catchment connections to underlying hydrogeological systems can help avoid overestimation of ecosystem respiration and advance our understanding of carbon source/sink status and overall terrestrial ecosystem carbon budgets.« less

Authors:
 [1];  [1];  [2];  [2]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. Florida Intl Univ., Miami, FL (United States)
Publication Date:
Research Org.:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1344550
Alternate Identifier(s):
OSTI ID: 1402132
Grant/Contract Number:  
SC0006703; DE‐SC0006703
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 120; Journal Issue: 12; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; carbon dioxide; methane; greenhouse gas; regional groundwater; tropical rainforest

Citation Formats

Oviedo-Vargas, Diana, Genereux, David P., Dierick, Diego, and Oberbauer, Steven F. The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica. United States: N. p., 2015. Web. doi:10.1002/2015JG003009.
Oviedo-Vargas, Diana, Genereux, David P., Dierick, Diego, & Oberbauer, Steven F. The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica. United States. https://doi.org/10.1002/2015JG003009
Oviedo-Vargas, Diana, Genereux, David P., Dierick, Diego, and Oberbauer, Steven F. Tue . "The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica". United States. https://doi.org/10.1002/2015JG003009. https://www.osti.gov/servlets/purl/1344550.
@article{osti_1344550,
title = {The effect of regional groundwater on carbon dioxide and methane emissions from a lowland rainforest stream in Costa Rica},
author = {Oviedo-Vargas, Diana and Genereux, David P. and Dierick, Diego and Oberbauer, Steven F.},
abstractNote = {In the tropical rainforest at La Selva Biological Station in Costa Rica, regional bedrock groundwater high in dissolved carbon discharges into some streams and wetlands, with the potential for multiple cascading effects on ecosystem carbon pools and fluxes. We investigated carbon dioxide (CO2) and methane (CH4) degassing from two streams at La Selva: the Arboleda, where ~1/3 of the streamflow is from regional groundwater, and the Taconazo, fed exclusively by local groundwater recharged within the catchment. The regional groundwater inflow to the Arboleda had no measurable effect on stream gas exchange velocity, dissolved CH4 concentration, or CH4 emissions but significantly increased stream CO2 concentration and degassing. CO2 evasion from the reach of the Arboleda receiving regional groundwater (lower Arboleda) averaged 5.5 mol C m-2 d-1, ~7.5x higher than the average (0.7 mol C m-2 d-1) from the stream reaches with no regional groundwater inflow (the Taconazo and upper Arboleda). Carbon emissions from both streams were dominated by CO2; CH4 accounted for only 0.06-1.70% of the total (average of both streams: 5 x10-3 mol C m-2 d-1). Annual stream degassing fluxes normalized by watershed area were 48 and 299 g C m-2 for the Taconazo and Arboleda, respectively. CO2 degassing from the Arboleda is a significant carbon flux, similar in magnitude to the average net ecosystem exchange estimated by eddy covariance. As a result, examining the effects of catchment connections to underlying hydrogeological systems can help avoid overestimation of ecosystem respiration and advance our understanding of carbon source/sink status and overall terrestrial ecosystem carbon budgets.},
doi = {10.1002/2015JG003009},
url = {https://www.osti.gov/biblio/1344550}, journal = {Journal of Geophysical Research. Biogeosciences},
issn = {2169-8953},
number = 12,
volume = 120,
place = {United States},
year = {2015},
month = {12}
}

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    Works referencing / citing this record:

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    High spatial and seasonal heterogeneity of pCO2 and CO2 emissions in a karst groundwater-stream continuum, southern China
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