Kinetics of peat soil dissolved organic carbon release to surface water. Part 2. A chemodynamic process model

Thibodeaux, Louis J.; Aguilar, Leonardo

doi:10.1016/j.chemosphere.2005.02.047

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…Similarly, 1.04 ± 0.13 mg C g soil −1 was extracted from S900, representing only 1.3% of SOC. Other studies have also found a comparable yield from other soils, ranging from 0.5 to 4% [16,20]. This water extraction process, which simulates the surface runoff process, extracts the quick release fraction in the carbon bed.…”

Section: Distribution Of Organic Carbon Fractionsmentioning

confidence: 81%

“…This water extraction process, which simulates the surface runoff process, extracts the quick release fraction in the carbon bed. The release of other soil carbon fractions is a microbe-driven process and only a small portion of SOC will be released over time [20]. WEOC from forest soils at different altitudes had similar distributions in POC, COC, and DOC fractions (Fig.…”

Section: Distribution Of Organic Carbon Fractionsmentioning

confidence: 87%

“…Temperature is one of the main factors determining microbial activity and DOC production in soil environments [11]. As temperature increases, the rate of microbial utilization of SOC increases, as well as the physicochemical dissociation of organic carbon from solid, resulting the increase in DOC in the water extraction organic carbon [20,29,30]. A total of 2.53 ± 0.28 mg C g soil −1 was extracted at 35 • C and was twice as much as the WEOC from the original soil (1.29 ± 0.19 mg C g soil −1 ).…”

Section: Temperature Effect On Productions Of Doc and Dbp Precursorsmentioning

confidence: 99%

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Trihalomethane, haloacetonitrile, and chloral hydrate formation potentials of organic carbon fractions from sub-tropical forest soils

Zhang

Kuang

Liu

et al. 2009

Journal of Hazardous Materials

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Section: Distribution Of Organic Carbon Fractionsmentioning

confidence: 81%

Section: Distribution Of Organic Carbon Fractionsmentioning

confidence: 87%

Section: Temperature Effect On Productions Of Doc and Dbp Precursorsmentioning

confidence: 99%

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Trihalomethane, haloacetonitrile, and chloral hydrate formation potentials of organic carbon fractions from sub-tropical forest soils

Zhang

Kuang

Liu

et al. 2009

Journal of Hazardous Materials

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“…First the model accounts for a labile and a recalcitrant DOC pool based on their decomposition rate Thibodeaux and Aguilar, 2005). The labile pool is readily available for decomposition in soil solution at all times and the recalcitrant pool is subject to a slower decomposition rate .…”

Section: Doc Fluxes and Processesmentioning

confidence: 99%

Representation of dissolved organic carbon in the JULES land surface model (vn4.4_JULES-DOCM)

et al. 2018

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Abstract. Current global models of the carbon (C) cycle consider only vertical gas exchanges between terrestrial or oceanic reservoirs and the atmosphere, thus not considering the lateral transport of carbon from the continents to the oceans. Therefore, those models implicitly consider all of the C which is not respired to the atmosphere to be stored on land and hence overestimate the land C sink capability. A model that represents the whole continuum from atmosphere to land and into the ocean would provide a better understanding of the Earth's C cycle and hence more reliable historical or future projections. A first and critical step in that direction is to include processes representing the production and export of dissolved organic carbon in soils. Here we present an original representation of dissolved organic C (DOC) processes in the Joint UK Land Environment Simulator (JULES-DOCM) that integrates a representation of DOC production in terrestrial ecosystems based on the incomplete decomposition of organic matter, DOC decomposition within the soil column, and DOC export to the river network via leaching. The model performance is evaluated in five specific sites for which observations of soil DOC concentration are available. Results show that the model is able to reproduce the DOC concentration and controlling processes, including leaching to the riverine system, which is fundamental for integrating terrestrial and aquatic ecosystems. Future work should include the fate of exported DOC in the river system as well as DIC and POC export from soil.

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“…However, model uncertainties were introduced by the assumption that the equilibrium between soluble OM in aqueous and solid phases can be achieved instantaneously. Experimental studies have proved that sorption/desorption processes of soluble OM in soil are more or less rate limited [Chow et al, 2006;Kaiser and Zech, 1998;Thihodeaux et al, 2004]. Several options are available for future model improvement, such as the Elovich equation and the fractional-power model [Kaiser and Zech, 1998], simple linear kinetic equation [Yurova et al, 2008] and the ''two sites'' method (One is rapid and another is rate limited) [Fan et al, 2010;Xu et al, 2012].…”

Section: Adsorption and Desorption Of Soluble Ommentioning

confidence: 99%

Predicting dissolved organic nitrogen export from a drained loblolly pine plantation

Tian

Youssef

Skaggs

et al. 2013

Water Resources Research

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[1] Dissolved organic nitrogen (DON) export from terrestrial ecosystems influences the ecology of receiving surface waters. The soil carbon (C) and nitrogen (N) model, DRAINMOD-N II, was modified to simulate key processes associated with DON transformations and transport in the soil profile. DON production is modeled by tracking dynamic C:N ratios of dissolved organic matter originating from various organic matter pools. The Langmuir isotherm was used to quantify the assumed instantaneous equilibrium between potentially soluble organic N in solid and aqueous phases. DON transport with soil water was simulated using a numerical solution to the advection-dispersion reaction equation. The modified model was used for simulating temporal variations of DON export from three loblolly pine (Pinus taeda L.) plantations located in eastern North Carolina.Results showed that the model can accurately predict DON export dynamics during storm events with Nash-Sutcliffe efficiency (E) of 0.5, seasonal DON losses with E above 0.6, and annual DON losses with E above 0.7. In addition to the well-recognized role of hydrological processes, reasonable quantifications of the seasonal changes in the potentially soluble soil organic matter, the DON sorption to soil particles, and the dynamic C:N ratios of dissolved organic matter were found to be essential for mechanistic representation of DON export dynamics. Specifically, adapting the dynamic C:N ratios enabled the model to reasonably describe the temporal variations of correlations between DON and dissolved organic carbon in drainage water.

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Kinetics of peat soil dissolved organic carbon release to surface water. Part 2. A chemodynamic process model

Cited by 17 publications

References 8 publications

Trihalomethane, haloacetonitrile, and chloral hydrate formation potentials of organic carbon fractions from sub-tropical forest soils

Trihalomethane, haloacetonitrile, and chloral hydrate formation potentials of organic carbon fractions from sub-tropical forest soils

Representation of dissolved organic carbon in the JULES land surface model (vn4.4_JULES-DOCM)

Predicting dissolved organic nitrogen export from a drained loblolly pine plantation

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