Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica
Abstract
Abstract A paired‐watershed approach was used to compare the quality and fluxes of dissolved organic matter (DOM) during stormflow and baseflow in two lowland tropical rainforest streams located in northeastern Costa Rica. The Arboleda stream received regional groundwater (RGW) flow, whereas the Taconazo stream did not. DOM quality was assessed with absorbance and fluorescence and stable carbon isotope (δ 13 C‐DOC) values. RGW DOM lacked detectable fluorescence and had specific ultraviolet absorption (SUVA 254 ) and absorbance slope ratio ( S R ) values consistent with low aromaticity and low molecular weight material, respectively. We attributed these properties to microbial degradation and sorption of humic DOM to mineral surfaces during transport through bedrock. SUVA 254 values were lower and S R values were higher in the Arboleda stream during baseflow compared to the Taconazo stream, presumably due to dilution by RGW. However, no significant difference in SUVA 254 or S R occurred between the streams during stormflow. SUVA 254 was negatively correlated to δ 13 C‐DOC ( r 2 = 0.61, P < 0.001), demonstrating a strong linkage between stream DOM characteristics and the relative amounts of RGW flow and local watershed runoff containing soil and throughfall C sources. Mean DOC exportmore »
- Authors:
-
- North Carolina State Univ., Raleigh, NC (United States)
- North Carolina State Univ., Raleigh, NC (United States); Stroud Water Research Center, Avondale, PA (United States)
- Florida Intl Univ., Miami, FL (United States)
- Publication Date:
- Research Org.:
- North Carolina State University, Raleigh, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1537329
- Alternate Identifier(s):
- OSTI ID: 1425504
- Grant/Contract Number:
- SC0006703; DE‐SC0006703
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 3; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Environmental Sciences & Ecology; Geology
Citation Formats
Osburn, Christopher L., Oviedo-Vargas, Diana, Barnett, Emily, Dierick, Diego, Oberbauer, Steven F., and Genereux, David P. Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica. United States: N. p., 2018.
Web. doi:10.1002/2017jg003960.
Osburn, Christopher L., Oviedo-Vargas, Diana, Barnett, Emily, Dierick, Diego, Oberbauer, Steven F., & Genereux, David P. Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica. United States. https://doi.org/10.1002/2017jg003960
Osburn, Christopher L., Oviedo-Vargas, Diana, Barnett, Emily, Dierick, Diego, Oberbauer, Steven F., and Genereux, David P. 2018.
"Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica". United States. https://doi.org/10.1002/2017jg003960. https://www.osti.gov/servlets/purl/1537329.
@article{osti_1537329,
title = {Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica},
author = {Osburn, Christopher L. and Oviedo-Vargas, Diana and Barnett, Emily and Dierick, Diego and Oberbauer, Steven F. and Genereux, David P.},
abstractNote = {Abstract A paired‐watershed approach was used to compare the quality and fluxes of dissolved organic matter (DOM) during stormflow and baseflow in two lowland tropical rainforest streams located in northeastern Costa Rica. The Arboleda stream received regional groundwater (RGW) flow, whereas the Taconazo stream did not. DOM quality was assessed with absorbance and fluorescence and stable carbon isotope (δ 13 C‐DOC) values. RGW DOM lacked detectable fluorescence and had specific ultraviolet absorption (SUVA 254 ) and absorbance slope ratio ( S R ) values consistent with low aromaticity and low molecular weight material, respectively. We attributed these properties to microbial degradation and sorption of humic DOM to mineral surfaces during transport through bedrock. SUVA 254 values were lower and S R values were higher in the Arboleda stream during baseflow compared to the Taconazo stream, presumably due to dilution by RGW. However, no significant difference in SUVA 254 or S R occurred between the streams during stormflow. SUVA 254 was negatively correlated to δ 13 C‐DOC ( r 2 = 0.61, P < 0.001), demonstrating a strong linkage between stream DOM characteristics and the relative amounts of RGW flow and local watershed runoff containing soil and throughfall C sources. Mean DOC export from the Taconazo stream during the study period was 2.62 ± 0.39 g C m −2 year −1 , consistent with other tropical streams, yet mean DOC export from the Arboleda stream was 13.79 ± 2.07 g C m −2 year −1 , one of the highest exports reported and demonstrating a substantial impact of old RGW from outside the watershed boundary can have on surface water carbon cycling.},
doi = {10.1002/2017jg003960},
url = {https://www.osti.gov/biblio/1537329},
journal = {Journal of Geophysical Research. Biogeosciences},
issn = {2169-8953},
number = 3,
volume = 123,
place = {United States},
year = {Wed Feb 07 00:00:00 EST 2018},
month = {Wed Feb 07 00:00:00 EST 2018}
}
Web of Science
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