Comparison of different isotherm models for dissolved organic carbon (DOC) and nitrogen (DON) sorption to mineral soil

Vandenbruwane, Jeroen; Qualls, Robert G.; Sleutel, Steven; Hofman, Georges

doi:10.1016/j.geoderma.2007.01.012

Cited by 63 publications

(35 citation statements)

References 26 publications

(36 reference statements)

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“…Functionally, m and b can be viewed as measures of the tendency of soil to adsorb and release DOC. This linear sorption isotherm model is the most widely used by researchers and successfully describes the dissolved organic matter (DOM) sorption phenomena in soil horizons with low sorption capacity or cases that occur within a narrow concentration range (Vandenbruwane et al, 2007). For DOC, the affinity of soils is closely linked to a number of soil properties.…”

Section: Doc Sorption/desorption Submodelmentioning

confidence: 99%

Modeling dissolved organic carbon in temperate forest soils: TRIPLEX-DOC model development and validation

Peng

Moore

et al. 2014

Geosci. Model Dev.

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Abstract. Even though dissolved organic carbon (DOC) is the most active carbon (C) cycling in soil organic carbon (SOC) pools, it receives little attention from the global C budget. DOC fluxes are critical to aquatic ecosystem inputs and contribute to the C balance of terrestrial ecosystems, but few ecosystem models have attempted to integrate DOC dynamics into terrestrial C cycling. This study introduces a new process-based model, TRIPLEX-DOC, that is capable of estimating DOC dynamics in forest soils by incorporating both ecological drivers and biogeochemical processes. TRIPLEX-DOC was developed from Forest-DNDC, a biogeochemical model simulating C and nitrogen (N) dynamics, coupled with a new DOC process module that predicts metabolic transformations, sorption/desorption, and DOC leaching in forest soils. The model was validated against field observations of DOC concentrations and fluxes at white pine forest stands located in southern Ontario, Canada. The model was able to simulate seasonal dynamics of DOC concentrations and the magnitudes observed within different soil layers, as well as DOC leaching in the age sequence of these forests. Additionally, TRIPLEX-DOC estimated the effect of forest harvesting on DOC leaching, with a significant increase following harvesting, illustrating that land use change is of critical importance in regulating DOC leaching in temperate forests as an important source of C input to aquatic ecosystems.

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Section: Doc Sorption/desorption Submodelmentioning

confidence: 99%

Modeling dissolved organic carbon in temperate forest soils: TRIPLEX-DOC model development and validation

Peng

Moore

et al. 2014

Geosci. Model Dev.

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“…[15] Physical adsorption of potentially soluble OM to soil particles has been found to be the predominant factor regulating DOM movement through soil profile [Guggenberger and Kaiser, 2003;Qualls, 2000;Vandenbruwane et al, 2007]. Current DOM models assume that the release of DOM from soil is either instantaneous [Michalzik et al, 2003;Neff and Asner, 2001], rate-limited [Gjettermann et al, 2008;Yurova et al, 2008], or dual-process (both instantaneous and rate limited) [Fan et al, 2010].…”

Section: Production Of Soluble Ommentioning

confidence: 99%

“…For simplicity, we assumed that the equilibrium between soluble OM in solid and aqueous phases occurs instantaneously. Previous studies have used various linear and nonlinear isotherms to quantify the adsorption/desorption of DOM to/ from mineral soil [Kothawala et al, 2008;Vandenbruwane et al, 2007]. Among these methods, the initial mass method is the one most widely used in modeling studies such as Neff and Asner [2001] and Michalzik et al [2003].…”

Section: Production Of Soluble Ommentioning

confidence: 99%

“…The linear isotherm is limited to low adsorbate concentrations because it ignores the maximum adsorption capacity of the soil matrix. In contrast, the Langmuir isotherm considers the adsorption capacity of soil, and was found to be the best model for quantifying sorption of DOC and DON in various soils [Kothawala et al, 2008;Vandenbruwane et al, 2007]. Therefore, we selected the Langmuir isotherm to quantify the assumed instantaneous DOM adsorption/desorption processes :…”

Section: Production Of Soluble Ommentioning

confidence: 99%

“…[45] Both experimental [Kalbitz et al, 2000;Vandenbruwane et al, 2007] and modeling studies [Fan et al, 2010;Futter et al, 2007;Jutras et al, 2011;Michalzik et al, 2003;Neff and Asner, 2001;Xu et al, 2012;Yurova et al, 2008] concluded that physical adsorption and desorption are dominant mechanisms controlling DOM dynamics in soil. Model simulation suggests that the ratio of dissolved to total soluble soil OM storage ranges from 9% to 35% on an annual basis depending on the hydrological conditions, indicating that soil adsorption is a key mechanism constraining hydrological losses of soil OM.…”

Section: Adsorption and Desorption Of Soluble Ommentioning

confidence: 99%

See 2 more Smart Citations

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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Changes in benthic nutrient sources within a wetland after hydrologic reconnection

Kuwabara

Topping

Carter

et al. 2012

Enviro Toxic and Chemistry

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Removing dams and levees to restore hydrologic connectivity and enhance ecosystem services such as nutrient removal has been an increasingly common management practice. In the present study, the authors assessed geochemical and biological changes following engineered levee breaches that reconnected eutrophic Upper Klamath Lake and Agency Lake, Oregon, USA, to an adjacent, historic wetland that had been under agricultural use for the last seven decades. Over the three-year study, the reconnected wetland served as a benthic source for both macronutrients (dissolved organic carbon [DOC], soluble reactive phosphorus [SRP], and ammonia) and micronutrients (dissolved iron and manganese). The magnitude of those benthic sources was similar to or greater than that of allochthonous sources. The highest DOC benthic flux to the water column occurred immediately after rewetting occurred. It then decreased during the present study to levels more similar to the adjacent lake. Dissolved ammonia fluxes, initially negative after the levee breaches, became consistently positive through the remainder of the study. Nitrate fluxes, also initially negative, became negligible two years after the levee breaches. In contrast to previous laboratory studies, SRP fluxes remained positive, as did fluxes of dissolved iron and manganese. Our results indicate that the timescales of chemical changes following hydrologic reconnection of wetlands are solute-specific and in some cases extend for multiple years beyond the reconnection event. During the present study, colonization of the reconnected wetlands by aquatic benthic invertebrates gradually generated assemblages similar to those in a nearby wetland refuge and provided further evidence of the multiyear transition of this area to permanent aquatic habitat. Such timescales should be considered when developing water-quality management strategies to achieve wetland-restoration goals.

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Comparison of different isotherm models for dissolved organic carbon (DOC) and nitrogen (DON) sorption to mineral soil

Cited by 63 publications

References 26 publications

Modeling dissolved organic carbon in temperate forest soils: TRIPLEX-DOC model development and validation

Modeling dissolved organic carbon in temperate forest soils: TRIPLEX-DOC model development and validation

Predicting dissolved organic nitrogen export from a drained loblolly pine plantation

Changes in benthic nutrient sources within a wetland after hydrologic reconnection

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