Kinetics of peat soil dissolved organic carbon release from bed sediment to water. Part 1. Laboratory simulation

Aguilar, Leonardo; Thibodeaux, Louis J.

doi:10.1016/j.chemosphere.2004.10.011

Cited by 35 publications

(25 citation statements)

References 15 publications

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“…The pattern of increasing DOC flux across time in response to warming may be linked to the exponential growth phase of bacteria, which can occur during the incubation period. Although DOC release from sediments or soils can be either abiotic (e.g., DOC dissolution and abiotic oxidation) and/or biotically mediated (via fungi and heterotrophic bacteria), the latter is generally considered to be far more important than the former (Aguilar and Thibodeaux, 2005). Our results indicate that increased temperatures also influence the composition and lability of sediment-released DOC, with more humic substances than protein-like components at higher temperatures (Figs.…”

Section: Effects Of Temperature On Transformations and Fluxes Of Docsupporting

confidence: 52%

“…The role of sediments is particularly critical in small streams compared with larger rivers due to the greater potential for hydrologic interactions between surface water with sediments in response to channel morphology/geometry and hyporheic exchange (e.g., Alexandria et al, 2000). Stream sediments can act as "sources" or "sinks" of bioreactive elements, where they can be either transferred from the water column to sediments through abiotic adsorption and biotic uptake (Bowes et al, 2003;Arango et al, 2008; or released back to the water column via diffusing diagenetic products of organic matter decomposition or reduction reactions (Jensen and Andersen, 1992;Aguilar and Thibodeaux, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Warming increases carbon and nutrient fluxes from sediments in streams across land use

Duan

Kaushal

2013

Biogeosciences

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Rising water temperatures due to climate and land use change can accelerate biogeochemical fluxes from sediments to streams. We investigated impacts of increased streamwater temperatures on sediment fluxes of dissolved organic carbon (DOC), nitrate, soluble reactive phosphorus (SRP) and sulfate. Experiments were conducted at 8 long-term monitoring sites across land use (forest, agricultural, suburban, and urban) at the Baltimore Ecosystem Study Long-Term Ecological Research (LTER) site in the Chesapeake Bay watershed. Over 20 yr of routine water temperature data showed substantial variation across seasons and years. Lab incubations of sediment and overlying water were conducted at 4 temperatures (4 °C, 15 °C, 25 °C, and 35 °C) for 48 h. Results indicated: (1) warming significantly increased sediment DOC fluxes to overlying water across land use but decreased DOC quality via increases in the humic-like to protein-like fractions, (2) warming consistently increased SRP fluxes from sediments to overlying water across land use, (3) warming increased sulfate fluxes from sediments to overlying water at rural/suburban sites but decreased sulfate fluxes at some urban sites likely due to sulfate reduction, and (4) nitrate fluxes showed an increasing trend with temperature at some forest and urban sites but with larger variability than SRP. Sediment fluxes of nitrate, SRP and sulfate were strongly related to watershed urbanization and organic matter content. Using relationships of sediment fluxes with temperature, we estimate a 5 °C warming would increase mean sediment fluxes of SRP, DOC and nitrate-N across streams by 0.27–1.37 g m−2 yr−1, 0.03–0.14 kg m−2 yr−1, and 0.001–0.06 kg m−2 yr−1. Understanding warming impacts on coupled biogeochemical cycles in streams (e.g., organic matter mineralization, P sorption, nitrification, denitrification, and sulfate reduction) is critical for forecasting shifts in carbon and nutrient loads in response to interactive impacts of climate and land use change

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Section: Effects Of Temperature On Transformations and Fluxes Of Docsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Duan

Kaushal

2013

Biogeosciences

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“…This is at least an order of magnitude higher than typical river DOC concentrations (4,42), but is much more typical of DOC concentrations occurring in soil porewater in peaty soils (7,33). This in turn suggests that the rising DOC concentrations in river water may per se not be sufficient to impart large-scale colloidal stability to the clay particles and iron oxhydroxides.…”

Section: What Happens To the Native Nom During The Structural Transfomentioning

confidence: 85%

Exploring How Organic Matter Controls Structural Transformations in Natural Aquatic Nanocolloidal Dispersions

King

Jarvie

2012

Environ. Sci. Technol.

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“…The nitrate formation, derived from the ammonia oxidation, also contributes to acidification (Chen et al, 2006). In addition, the oxidation of reduced compounds from respiration causes the pH to increase (Cunha-Santino and Bianchini Jr., 2006), as is the case in the formation of humic compounds (Aguilar and Thibodeaux, 2005). Park and Cho (2003) observed substantial release of soluble organic matter during leaching.…”

Section: Results and Results And Results And Results And D D D Discusmentioning

confidence: 99%

Efeito da disponibilidade de nitrogênio no consumo de oxigênio durante a mineralização de Scirpus cubensis da Lagoa do Infernão (São Paulo, Brasil)

Lemos

Bianchini

2007

Acta Sci. Biol. Sci.

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mineralização das frações particuladas, tenderam a aumentar com a elevação da concentração de nitrato. O aumento do nível de nitrato afetou diferentemente a decomposição das frações da matéria orgânica; a matéria orgânica particulada foi mais facilmente degradada do que a dissolvida em presença de maiores concentrações de nitrato.Palavras-chave: decomposição, macrófitas, nitrogênio, consumo de oxigênio, MOP, MOD.

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Kinetics of peat soil dissolved organic carbon release from bed sediment to water. Part 1. Laboratory simulation

Cited by 35 publications

References 15 publications

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Warming increases carbon and nutrient fluxes from sediments in streams across land use

Exploring How Organic Matter Controls Structural Transformations in Natural Aquatic Nanocolloidal Dispersions

Efeito da disponibilidade de nitrogênio no consumo de oxigênio durante a mineralização de <em>Scirpus cubensis</em> da Lagoa do Infernão (São Paulo, Brasil)

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