Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica

Osburn, Christopher L.; Oviedo-Vargas, Diana; Barnett, Emily; Dierick, Diego; Oberbauer, Steven F.; Genereux, David P.

doi:10.1002/2017jg003960

Title: Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica

Journal Article · 06 February 2018 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1002/2017jg003960 · OSTI ID:1537329

^[1];

^[2]; Barnett, Emily ^[3]; Dierick, Diego ^[4];

^[4]; Genereux, David P. ^[3]

North Carolina State Univ., Raleigh, NC (United States); DOE/OSTI
North Carolina State Univ., Raleigh, NC (United States); Stroud Water Research Center, Avondale, PA (United States)
North Carolina State Univ., Raleigh, NC (United States)
Florida Intl Univ., Miami, FL (United States)

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 (δ¹³C-DOC) values. RGW DOM lacked detectable fluorescence and had specific ultraviolet absorption (SUVA₂₅₄) 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. SUVA₂₅₄ values were lower and SR 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 SUVA₂₅₄ or SR occurred between the streams during stormflow. SUVA254 was negatively correlated to δ13C-DOC (r² = 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^-1-2 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.

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Research Organization:: North Carolina State Univ., Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0006703

OSTI ID:: 1537329

Journal Information:: Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 3 Vol. 123; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Regional Groundwater and Storms Are Hydrologic Controls on the Quality and Export of Dissolved Organic Matter in Two Tropical Rainforest Streams, Costa Rica

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