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DIVISION S-7—FOREST & RANGE SOILS

Adsorption of Dissolved Organic and Inorganic Phosphorus in Soils of a Weathering Chronosequence

^a Dep. of Environmental and Resource Sciences, MS 370, Univ. of Nevada–Reno, Reno, NV 89557
^b Ecology and Evolutionary Biology, Univ. of Oregon, Eugene, OR 97403

^* Corresponding author (qualls{at}unr.edu).

Leaching of dissolved organic matter (DOM) and associated nutrients can be a significant loss from developing ecosystems. We studied how the adsorption of dissolved organic P (DOP) and PO₄ changes during the development of young andesitic soils and determined which soil characteristics are responsible for these changes. We sampled 77, 255, 616, and about 1200+ yr-old andesitic soils at the 0- to 10-, 30- to 40-, and 140- to 150-cm soil depths and performed adsorption isotherm analyses that were described using a modified Langmuir (for DOP) or linear equation (for PO₄). We also sampled soil solution at the 10- to 20-, 40-, and 150-cm soil depths during the main snow melt period in 2001 and 2002 and analyzed it for DOP and PO₄. The ability of the soils to adsorb DOP and PO₄ increased with soil age. Stepwise multiple regression analyses between the adsorption capacity for DOP, or the slope of the adsorption isotherm for PO₄, and several soil parameters showed that allophane concentrations control the adsorption of DOP and PO₄ in these soils. Tests of preferential adsorption of DOP vs. PO₄ and DOC vs. DOP showed that the adsorption strength increased in the following order: DOC < DOP < PO₄. The preferential adsorption of PO₄ vs. DOP and DOP vs. DOC increased significantly with increasing soil development, whereas the soil depth did not have a consistent and significant effect. Significant correlations between the null-point adsorption of DOP or PO₄ and field soil solution concentrations indicated that the results obtained in laboratory experiments were applicable to field conditions. Consequently, the tendency of DOP and PO₄ to leach from these andesitic soils decreases as soils and ecosystem develop.

Abbreviations: DOC, dissolved organic C • DOM, dissolved organic matter • DON, dissolved organic N • DOP, dissolved organic P • SOC, soil organic C

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