Transport of labile carbon in runoff as affected by land use and rainfall characteristics

Jacinthe, Pierre-André; Lal, Rattan; Owens, L. B.; Hothem, D.L

doi:10.1016/j.still.2003.11.004

Cited by 170 publications

(116 citation statements)

References 25 publications

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“…The results of Jacinthe et al (2004) suggest a more selective detachment and sorting of labile OC fractions during low-intensity storms than high-intensity storms. They stated that the high soil losses associated with intense rainstorms can determine the overall impact of erosional events on losses of labile OC.…”

mentioning

confidence: 84%

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

Schiettecatte

Gabriëls

Cornelis

et al. 2008

Soil Science Soc of Amer J

151

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Erosion and loss of organic carbon (OC) result in degradation of the soil surface. Rill and interrill erosion processes on a silt loam soil were examined in laboratory rainfall and flume experiments. These experiments showed that rill and interrill erosion processes have contrasting impacts on enrichment of OC in transported sediment. Rill erosion was found to be nonselective, while for interrill erosion the enrichment ratio of OC, EROC, varied between 0.9 and 2.6 and was inversely related to the unit sediment discharge. At unit sediment discharge values >0.0017 kg s−1 m−1, the EROC remained equal to 1. The enrichment process was not influenced by raindrop impact. Enrichment of OC by “aggregate stripping” was found to be unimportant in our study. This was attributed to the low aggregate stability of the soil and the equal distribution of OC within the different soil aggregate classes.

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mentioning

confidence: 84%

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

Schiettecatte

Gabriëls

Cornelis

et al. 2008

Soil Science Soc of Amer J

151

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Section: Canadian Journal Of Soil Sciencementioning

confidence: 99%

“…However, the extent of enrichment of labile C materials in depositional areas may depend on rainfall characteristics. For instance, Jacinthe et al (2004), found that low-intensity rainfall mobilized C that was 2.5 times more labile than C released during high-energy storms, but high intensity rainfall accounted for up to 75% of the soil erosion in a season.The proportion of OC in labile forms in depositional sites may also be related to the extent of physical and chemical protection of C, both of which are related to clay and silt contents. Using soils from a range of temperate and tropical areas, Hassink (1997) developed the concept of the "capacity factor" of a soil, which he defined as the maximum amount of OC associated with clay and silt particles in cultivated native grassland soils.…”

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confidence: 99%

Factors influencing mineralizable carbon in a landscape with variable topography

Chan¹,

Gregorich²

2007

Can. J. Soil. Sci.

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. 2007. Factors influencing mineralizable carbon in a landscape with variable topography. Can. J. Soil Sci. 87: 495-509. Management-induced erosion has substantially increased the spatial variability in soil organic carbon (OC) stocks in landscapes with variable topography, but its impact on C dynamics is not well understood. The variability in cumulative C mineralization of samples from five positions in a landscape was examined in an incubation study and the effects of water content and depth within the A horizon were assessed. Mineralization was generally at a maximum at water contents between 80 and 95% water-filled pore space. The amount of C mineralized increased with OC content, but the proportion of the mineralizable OC decreased with increasing OC content. Few significant differences in C mineralization existed between surface and subsurface layers of the A horizon. The spatial patterns in maximum C mineralization were generally indicative of the patterns obtained when mineralization was calculated using spatial patterns of actual seasonal average water contents. This suggests the spatial pattern of maximum mineralization was not strongly influenced by variable hydrologic conditions on this site and reflects the spatial patterns in annual mineralization. The proportion of OC mineralized was not related to the proportion of the OC in particulate organic carbon (POC) or in the silt + clay fractions, but was significantly negatively related to the saturation of the clay + silt fraction with C. We speculate that the decline in the proportion of mineralized OC with increasing OC content reflects an increased proportion of the capacity of the silt + clay fraction to retain and physically protect OC within microaggregates.Key words: Erosion, deposition, mineralizable organic carbon, spatial variability Chan, C., Kay, B. D. et Gregorich, E. G. 2007. Facteurs influençant la minéralisation du carbone dans un paysage à relief variable. Can. J. Soil Sci. 87: 495-509. L'érosion qui résulte de la gestion des terres a sensiblement accru la variabilité spatiale des réserves de carbone organique (CO) du sol dans les paysages à relief variable, mais on comprend mal son incidence sur la dynamique du carbone. Les auteurs ont vérifié la variabilité de la minéralisation cumulative du C dans les échantillons prélevés à cinq endroits, dans un paysage, lors d'une étude d'incubation puis ont évalué les effets de la teneur en eau et de la profondeur dans l'horizon A examiné. En général, la minéralisation atteint un maximum quand la teneur en eau correspond à 80-95 % de l'espace occupé par les pores emplis d'eau. La quantité de C minéralisé s'accroît avec la concentration de CO, mais la proportion de CO minéralisable diminue à mesure qu'augmente la concentration de CO. La minéralisation du C varie peu entre la couche superficielle et les couches inférieures de l'horizon A. Dans l'ensemble, la minéralisation maximale du C suit une tendance spatiale analogue à celle observée quand on calcule la minéralisation à partir des tendances ...

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“…There was no significant difference in mineralization of C between the eroded soil samples and the control soil samples. Jacinthe et al (2004) incubated runoff samples collected during a one-year period at the outlet of small watersheds under cultivation. Mineralizability of eroded C, proved to be dependent on the rainstorm type, generating the runoff and varied from 30-40% for low-energy rainstorms, to only 13% during high-intensity storms.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental and field conditions also vary widely and the effect of variations in initial soil conditions and/or erosion intensity are not well understood. It may be hypothesised that the degree of aggregate disruption during erosion and transport plays an important role in subsequent SOC mineralization (Jacinthe et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

The effect of soil redistribution on soil organic carbon: an experimental study

Hemelryck

Fiener²,

Oost

et al. 2010

Biogeosciences

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Abstract. Soil erosion, transport and deposition by water drastically affect the distribution of soil organic carbon (SOC) within a landscape. Furthermore, soil redistribution is assumed to have a large impact on the exchange of carbon (C) between the pedosphere and the atmosphere. There is, however, significant scientific disagreement concerning the relative importance of the key-mechanisms at play. One of the major uncertainties concerns the fraction of SOC that is mineralized when soil is eroded by water, from the moment when detachment takes place until the moment when the SOC becomes protected by burial. In this study, the changes in C-exchange between soil and atmosphere as affected by soil redistribution processes were experimentally quantified. During a laboratory experiment, three types of erosional events were simulated, each of which was designed to produce a different amount of eroded soil material with a different degree of aggregation. During a 98-day period, CO 2 -efflux was measured in-situ and under field conditions on undisturbed soils with a layer of deposited soil material. Depending on the initial conditions of the soil and the intensity of the erosion process, a significant fraction of eroded SOC was mineralized after deposition. However, results also suggest that deposition produces a dense stratified layer of sediment that caps the soil surface, leading to a decrease in SOC decomposition in deeper soil layers. As a result, the net effect of erosion on SOC can be smaller, depending on the Correspondence to: P. Fiener (peter.fiener@uni-koeln.de) functioning of the whole soil system. In this study, soil redistribution processes contributed an additional emission of 2 to 12% of total C contained in eroded sediment.

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Transport of labile carbon in runoff as affected by land use and rainfall characteristics

Cited by 170 publications

References 25 publications

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

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

Factors influencing mineralizable carbon in a landscape with variable topography

The effect of soil redistribution on soil organic carbon: an experimental study

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