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Title

Influence of Dissolved Organic Matter Sources on In-Stream Net Dissolved Organic Carbon Uptake in a Mediterranean Stream

AuthorsLupon, Anna ; Catalán, Núria; Martí, Eugènia ; Bernal, Susana
KeywordsDissolved organic carbon
In-stream net uptake
Leaf litter
Groundwater inputs
Dissolved organic matter composition
Carbon availability
Issue Date17-Jun-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationWater 12(6): 1722 (2020)
AbstractStudies exploring how different sources of dissolved organic matter (DOM) influence in-stream dissolved organic carbon (DOC) uptake at the ecosystem scale are scarce in the literature. To fill this knowledge gap, we examined the relationship between DOM sources and in-stream net DOC uptake (UDOC) in a sub-humid Mediterranean stream. We considered four reach-scale scenarios occurring under natural conditions that differed in predominant DOM sources (groundwater, leaf litter, and/or upstream water). Results showed that groundwater inputs favored in-stream net DOC uptake, while leaf litter inputs promoted in-stream net DOC release. However, there was no clear effect of DOM source mixing on the magnitude of UDOC. Further, the variability in UDOC within and among scenarios was mostly explained by stream DOC concentration, suggesting that DOC availability limits microbial activity in this stream. DOM composition became a controlling factor of UDOC variability only during the leaf litter period, when stream DOC concentration was the highest. Together, these results suggest that the capacity of headwater forested streams to process DOC is closely tied to the availability of different DOM sources and how they vary over time and along the river network.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/w12061722
URIhttp://hdl.handle.net/10261/215719
DOI10.3390/w12061722
ISSN2073-4441
E-ISSN2073-4441
Appears in Collections:(CEAB) Artículos
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