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- W2028883209 abstract "Dissolved organic C (DOC) is the most reactive and mobile component of soil C and can be retained within mineral soils by adsorption. We determined the adsorption characteristics for 52 mineral soil samples from 17 temperate and boreal soil profiles, using a modified Langmuir equation. The DOC solution used for batch experiments was derived from the organic horizons of a Spodosol. We analyzed the extent to which soil properties, such as the sum of poorly crystalline Fe and Al (Fepc + Alpc), texture, and soil C, are related to DOC adsorption to mineral soils. Sorption characteristics including the maximum adsorption capacity (Qmax), and the null point (np), where adsorption equals desorption, were best explained by Fepc + Alpc (R2 = 0.55 and 0.28, respectively). The Alpc exerted a stronger influence than Fepc on Qmax A simple method for estimating Qmax was developed whereby the change in pOH after treatment with NaF is well correlated to Fepc + Alpc (R2 = 0.71, P < 0.0001) and Qmax (R2 = 0.50, P < 0.0001). The influence of clay content on Qmax was of secondary importance and was largely masked by the dominant influence of Fepc + Alpc Soil C did not have any influence on Qmax, but a slight negative influence on np. The B horizons of Spodosols and volcanic soils had the greatest Qmax, while large levels of soil C in Spodosols produced a high desorption potential. Results from this study emphasize the importance of considering the adsorption potential in conjunction with the desorption potential for better prediction of changes to the size of mineral soil C pools and DOC export to aquatic systems." @default.
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- W2028883209 date "2009-11-01" @default.
- W2028883209 modified "2023-10-18" @default.
- W2028883209 title "Soil Properties Controlling the Adsorption of Dissolved Organic Carbon to Mineral Soils" @default.
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- W2028883209 doi "https://doi.org/10.2136/sssaj2008.0254" @default.
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