Characterization and qualitative changes in DOM chemical characteristics related to hydrologic conditions in a Pampean stream

Messetta, María Laura; Hegoburu, Cecilia; Casas-Ruiz, Joan Pere; Butturini, Andrea; Feijoó, Claudia

doi:10.1007/s10750-017-3422-x

Cited by 11 publications

(6 citation statements)

References 54 publications

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“…Median net release was 860 mg DOC/(m 2 •d) in Las Flores, which contrast with significant DOC net retention observed in streams and rivers from other regions (Sirivichi et al, 2011;Kaushal et al, 2014;Butturini et al, 2016). Considering that DOC in Las Flores was mainly composed by protein-like compounds (Messetta et al, 2018) during baseflow, DOC release may be explained by biological in-stream generation. Low flow velocity, warm temperatures and high light inputs enhance stream primary production and thus in-stream DOC generation (Battin et al, 2008;Fasching et al, 2016;Ejarque et al, 2017;Wagner et al, 2017).…”

Section: Sources and Processing Of Nutrients And Doc In Las Flores Stmentioning

confidence: 71%

“…NO 3 in groundwater can result from the oxidation of nitrogenous organic material derived from agricultural practices (Carbó et al, 2009). However, considering the autochthonous imprint of groundwater DOC in Las Flores (Messetta et al, 2018), it is possible that in our case most NO 3 derived from the degradation of ancient soil organic matter within the aquifer (Fellman et al, 2014;Kaushal et al, 2014).…”

Section: Origin Of Nutrients and Doc In Pampean Streamsmentioning

confidence: 93%

“…High NO 3 levels were also found in groundwater from farm and urban areas compared to less impacted areas in the region (Momo et al 1999;Carbó et al 2009), suggesting that the shallow aquifer itself can be a source of NO 3 to stream water. DOC levels are also elevated in Pampean streams (6.42 ± 2.79 mg/l; Messetta et al, 2018) in relation to streams and rivers of USA (McKnight et al, 2001;Arreghini et al, 2005;Raymond and Saires, 2010), but they are within the range reported for other streams of the world (Dawson et al, 2008;Knorr, 2013;Lyon et al, 2010;Laudon et al, 2011;Kamjunke et al, 2015). Soils in the region are rich, with a high organic content (3-3.9 % in northeast Pampa) that may derive from the decomposition of herbaceous vegetation typical of the region (Sainz Rozas et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Soils in the region are rich, with a high organic content (3-3.9 % in northeast Pampa) that may derive from the decomposition of herbaceous vegetation typical of the region (Sainz Rozas et al, 2011). So, it is expected that overland flow washes the organic matter accumulated in the top of the soils and releases it to the stream as DOC during storm events (Bernal et al, 2002;Messetta et al, 2018). DOC could also derive from the decomposition of dense macrophyte communities (and associated epiphyton) that are common in streams of the region (Giorgi et al, 2005;Catalán et al, 2013;Messetta et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…So, it is expected that overland flow washes the organic matter accumulated in the top of the soils and releases it to the stream as DOC during storm events (Bernal et al, 2002;Messetta et al, 2018). DOC could also derive from the decomposition of dense macrophyte communities (and associated epiphyton) that are common in streams of the region (Giorgi et al, 2005;Catalán et al, 2013;Messetta et al, 2018). In addition, epiphytic and benthic biofilms could generate DOC through biological production (Romera-Castillo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Retention and release of nutrients and dissolved organic carbon in a nutrient-rich stream: A mass balance approach

Feijoó

Messetta

Hegoburu

et al. 2018

Journal of Hydrology

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The relevance of fluvial systems to process nutrients and carbon is widely accepted, but their role as sinks and sources of nutrients and dissolved organic carbon (DOC) is still under discussion especially in non-forested and highly productive streams. In this study, we used a mass balance approach at a reach scale in a Pampean stream to elucidate the major sources of water, nutrients and DOC as well as to determine net in-stream retention efficiencies of nutrients and DOC under different hydrological conditions. We measured conductivity, conservative ions (chloride and calcium), soluble reactive phosphorus (SRP), nitrate (NO 3), nitrite (NO 2), ammonium (NH 4) and DOC at the end-point of a reach of Las Flores stream (site A), at two upstream tributaries (B1 and B2), and at each potential hydrological contributors to stream flow (groundwater, overland and subsurface flows, and rainfall). In addition, we monitored one storm event where we collected samples during the rising and the recession limb of the hydrograph. Stream flow originated from groundwater (≈ 50%), upstream tributaries (B1 and B2) at baseflow, whereas overland flow contributed >20% during high flows. During baseflow, groundwater provided NO 3 to stream water, while B2, which received a point input of a dairy industry, was the main source of SRP and NH 4. Conversely, SRP and NH 4 were provided by B1, overland flow and subsurface flow during high flows. Overland flow also contributed DOC during high flow periods. Mass balance estimates revealed that the reach acts as a source of DOC, SRP and NO 3 (21.4, 37.4 and 53.5 % mean net in-stream release, respectively) and a sink of NH 4 (-36.8 % mean net instream retention). Relevant in-stream processes may be nutrient uptake (as in the case of SRP and NH 4) and biotic production (DOC), as well as decomposition (SRP) and nitrification (NH 4) in this Pampean stream. Our results stress the relevance of nutrient and DOC generation processes within the channel in non-forested and highly productive streams.

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