Enrichment of Organic Carbon in Sediment Transport by Interrill and Rill Erosion Processes

Schiettecatte, Wouter; Gabriëls, Donald; Cornelis, Wim; Hofman, Georges

doi:10.2136/sssaj2007.0201

Cited by 152 publications

(115 citation statements)

References 40 publications

(35 reference statements)

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“…(7) is used to estimate the transport for sediment delivered to the rill network (or that leaves a grid cell when there is no incised rill). This approach is consistent with empirical observations showing that the enrichment of finer sediment particles and SOC in suspended sediment is mainly controlled by the transport capacity of the flow (Schiettecatte et al, 2008a). To represent the amount of primary particles vs. soil aggregates of suspended sediments, the model interpolates the settling velocity for each particle class and grid cell according to the proportion of particles detached by interrill or rill erosion.…”

Section: Modelling Erosion and Depositionsupporting

confidence: 78%

“…interrill erosion detaches and transports primary particles, whereas rill erosion is unselective and detaches and transports soil aggregates. The concept of particle size-selective interrill and nonselective rill erosion which detaches and entrains the entire soil matrix has been documented in numerous studies (Kuhn et al, 2010;Polyakov and Lal, 2004;Quinton et al, 2001;Schiettecatte et al, 2008a). Following non-selective splash erosion (Poesen and Savat, 1980;Poesen, 1985;Parsons et al, 1991), selectivity is caused by particle size specific deposition differences, where coarser and heavier particles settle out earlier than finer and lighter particles (Schiettecatte et al, 2008b).…”

Section: Sediment and Carbon Mobilization And Export Under Different mentioning

confidence: 99%

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Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

2017

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Abstract.Over the last few decades, soil erosion and carbon redistribution modelling has received a lot of attention due to large uncertainties and conflicting results. For a physically based representation of event dynamics, coupled soil and carbon erosion models have been developed. However, there is a lack of research utilizing models which physically represent preferential erosion and transport of different carbon fractions (i.e. mineral bound carbon, carbon encapsulated by aggregates and particulate organic carbon). Furthermore, most of the models that have a high temporal resolution are applied to relatively short time series (< 10 yr −1 ), which might not cover the episodic nature of soil erosion. We applied the event-based multi-class sediment transport (MCST) model to a 100-year time series of rainfall observation. The study area was a small agricultural catchment (3 ha) located in the Belgium loess belt about 15 km southwest of Leuven, with a rolling topography of slopes up to 14 %. Our modelling analysis indicates (i) that interrill erosion is a selective process which entrains primary particles, while (ii) rill erosion is non-selective and entrains aggregates, (iii) that particulate organic matter is predominantly encapsulated in aggregates, and (iv) that the export enrichment in carbon is highest during events dominated by interrill erosion and decreases with event size.

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Section: Modelling Erosion and Depositionsupporting

confidence: 78%

Section: Sediment and Carbon Mobilization And Export Under Different mentioning

confidence: 99%

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

2017

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“…While catchment C1 follows the expected behaviour, i.e. decreasing SOC enrichment with increasing event size (Auerswald and Weigand, 1999;Menzel, 1980;Polyakov and Lal, 2004b;Sharpley, 1985), and is in good agreement with the results of Wang et al (2010) for similar soils in the Belgian loam belt, event size had hardly any effect on the SOC enrichment in catchment C2, where any larger particles, including aggregates, are deposited in the grassed waterway due to consistently high hydraulic roughness throughout the year. Hence, a parsimonious approach solely relating annual erosion magnitude to SOC enrichment (e.g.…”

Section: Lateral C Fluxessupporting

confidence: 75%

“…However, this approach is likely to lead to biased estimates of both water-erosion-induced SOC redistribution and its effect on vertical C fluxes. Numerous studies have shown that the transport of SOC is selective (Schiettecatte et al, 2008), controlled by event characteristics (Sharpley, 1985;Van Hemelryck et al, 2010) and soil aggregation Kuhn, 2014, 2016). The enrichment of SOC during transport has been explicitly addressed by a few modelling studies, using different approaches Lacoste et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Process-oriented modelling to identify main drivers of erosion-induced carbon fluxes

Wilken

Sommer

Oost

et al. 2017

SOIL

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Abstract. Coupled modelling of soil erosion, carbon redistribution, and turnover has received great attention over the last decades due to large uncertainties regarding erosion-induced carbon fluxes. For a process-oriented representation of event dynamics, coupled soil-carbon erosion models have been developed. However, there are currently few models that represent tillage erosion, preferential water erosion, and transport of different carbon fractions (e.g. mineral bound carbon, carbon encapsulated by soil aggregates). We couple a process-oriented multi-class sediment transport model with a carbon turnover model (MCST-C) to identify relevant redistribution processes for carbon dynamics. The model is applied for two arable catchments (3.7 and 7.8 ha) located in the Tertiary Hills about 40 km north of Munich, Germany. Our findings indicate the following: (i) redistribution by tillage has a large effect on erosion-induced vertical carbon fluxes and has a large carbon sequestration potential; (ii) water erosion has a minor effect on vertical fluxes, but episodic soil organic carbon (SOC) delivery controls the long-term erosion-induced carbon balance; (iii) delivered sediments are highly enriched in SOC compared to the parent soil, and sediment delivery is driven by event size and catchment connectivity; and (iv) soil aggregation enhances SOC deposition due to the transformation of highly mobile carbon-rich fine primary particles into rather immobile soil aggregates.

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“…The relative extent of interrill compared with rill erosion depends upon local landscape and precipitation conditions, where higher precipitation intensity and steeper slopes can drive increased rill formation (Moody et al, 2013). The relative role of rill and interrill erosion can control the mobility of PyC throughout a landscape, as rill erosion likely would not preferentially transport PyC and would result in transport of bulk soil material (Schiettecatte et al, 2008), while sheet or interrill erosion can preferentially transport smaller, lighter, and organic-rich material (Wang et al, 2010).…”

Section: Post-fire Erosionmentioning

confidence: 99%

Pyrogenic Carbon Erosion: Implications for Stock and Persistence of Pyrogenic Carbon in Soil

Abney

Berhe

2018

Front. Earth Sci.

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Pyrogenic carbon (PyC) constitutes an important pool of soil organic matter (SOM), particularly for its reactivity and because of its assumed long residence times in soil. In the past, research on the dynamics of PyC in the soil system has focused on quantifying stock and mean residence time (MRT) of PyC in soil, as well as determining both PyC stabilization mechanisms and loss pathways. Much of this research has focused on decomposition as the most important loss pathway for PyC from soil. However, the low density of PyC and its high concentration on the soil surface after fire indicates that a significant proportion of PyC formed or deposited on the soil surface is likely laterally transported away from the site of production by wind and water erosion. Here, we present a synthesis of available data and literature to compare the magnitude of the water-driven erosional PyC flux with other important loss pathways, including leaching and decomposition, of PyC from soil. Furthermore, we use a simple first-order kinetic model of soil PyC dynamics to assess the effect of erosion and deposition on residence time of PyC in eroding landscapes. Current reports of PyC MRT range from 250 to 660 years. Using a specific example-based model system, we find that ignoring the role of erosion may lead to the under-or over-estimation of PyC MRT on the centennial time scale. Furthermore, we find that, depending on the specific landform positions, timescales considered, and initial concentrations of PyC in soil, ignoring the role of erosion in distributing PyC across a landscape can lead to discrepancies in PyC concentrations on the order of several 100 g PyC m −2 . Erosion is an important PyC flux that can act as a significant control on the stock and residence time of PyC in the soil system.

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Enrichment of Organic Carbon in Sediment Transport by Interrill and Rill Erosion Processes

Cited by 152 publications

References 40 publications

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

Modelling a century of soil redistribution processes and carbon delivery from small watersheds using a multi-class sediment transport model

Process-oriented modelling to identify main drivers of erosion-induced carbon fluxes

Pyrogenic Carbon Erosion: Implications for Stock and Persistence of Pyrogenic Carbon in Soil

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