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Title: Water-carbon Links in a Tropical Forest: How Interbasin Groundwater Flow Affects Carbon Fluxes and Ecosystem Carbon Budgets

Abstract

This report covers the outcomes from a quantitative, interdisciplinary field investigation of how carbon fluxes and budgets in a lowland tropical rainforest are affected by the discharge of old regional groundwater into streams, springs, and wetlands in the forest. The work was carried out in a lowland rainforest of Costa Rica, at La Selva Biological Station. The research shows that discharge of regional groundwater high in dissolved carbon dioxide represents a significant input of carbon to the rainforest "from below", an input that is on average larger than the carbon input "from above" from the atmosphere. A stream receiving discharge of regional groundwater had greatly elevated emissions of carbon dioxide (but not methane) to the overlying air, and elevated downstream export of carbon from its watershed with stream flow. The emission of deep geological carbon dioxide from stream water elevates the carbon dioxide concentrations in air above the streams. Carbon-14 tracing revealed the presence of geological carbon in the leaves and stems of some riparian plants near streams that receive inputs of regional groundwater. Also, discharge of regional groundwater is responsible for input of dissolved organic matter with distinctive chemistry to rainforest streams and wetlands. The discharge of regional groundwatermore » in lowland surface waters has a major impact on the carbon cycle in this and likely other tropical and non-tropical forests.« less

Authors:
 [1];  [1];  [2];  [1];  [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) (SC-23)
OSTI Identifier:
1348200
Report Number(s):
DOE-NCSTATE-0006703
DOE Contract Number:  
SC0006703
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbon dioxide; groundwater; rainforest; tropical; stream; emissions; flux

Citation Formats

Genereux, David, Osburn, Christopher, Oberbauer, Steven, Oviedo Vargas, Diana, and Dierick, Diego. Water-carbon Links in a Tropical Forest: How Interbasin Groundwater Flow Affects Carbon Fluxes and Ecosystem Carbon Budgets. United States: N. p., 2017. Web. doi:10.2172/1348200.
Genereux, David, Osburn, Christopher, Oberbauer, Steven, Oviedo Vargas, Diana, & Dierick, Diego. Water-carbon Links in a Tropical Forest: How Interbasin Groundwater Flow Affects Carbon Fluxes and Ecosystem Carbon Budgets. United States. https://doi.org/10.2172/1348200
Genereux, David, Osburn, Christopher, Oberbauer, Steven, Oviedo Vargas, Diana, and Dierick, Diego. Mon . "Water-carbon Links in a Tropical Forest: How Interbasin Groundwater Flow Affects Carbon Fluxes and Ecosystem Carbon Budgets". United States. https://doi.org/10.2172/1348200. https://www.osti.gov/servlets/purl/1348200.
@article{osti_1348200,
title = {Water-carbon Links in a Tropical Forest: How Interbasin Groundwater Flow Affects Carbon Fluxes and Ecosystem Carbon Budgets},
author = {Genereux, David and Osburn, Christopher and Oberbauer, Steven and Oviedo Vargas, Diana and Dierick, Diego},
abstractNote = {This report covers the outcomes from a quantitative, interdisciplinary field investigation of how carbon fluxes and budgets in a lowland tropical rainforest are affected by the discharge of old regional groundwater into streams, springs, and wetlands in the forest. The work was carried out in a lowland rainforest of Costa Rica, at La Selva Biological Station. The research shows that discharge of regional groundwater high in dissolved carbon dioxide represents a significant input of carbon to the rainforest "from below", an input that is on average larger than the carbon input "from above" from the atmosphere. A stream receiving discharge of regional groundwater had greatly elevated emissions of carbon dioxide (but not methane) to the overlying air, and elevated downstream export of carbon from its watershed with stream flow. The emission of deep geological carbon dioxide from stream water elevates the carbon dioxide concentrations in air above the streams. Carbon-14 tracing revealed the presence of geological carbon in the leaves and stems of some riparian plants near streams that receive inputs of regional groundwater. Also, discharge of regional groundwater is responsible for input of dissolved organic matter with distinctive chemistry to rainforest streams and wetlands. The discharge of regional groundwater in lowland surface waters has a major impact on the carbon cycle in this and likely other tropical and non-tropical forests.},
doi = {10.2172/1348200},
url = {https://www.osti.gov/biblio/1348200}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {3}
}