| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
a Dep. of Environmental and Resource Sciences, MS 370, University of Nevada-Reno, Reno, NV 89557
b Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403
* Corresponding author (qualls{at}unr.edu).
Leaching of dissolved organic matter (DOM) and the associated nutrient elements can be a significant form of loss from developing ecosystems. We studied how the adsorption of dissolved organic C (DOC) and N (DON) changes during soil development and determined which soil characteristics control adsorption. We sampled 77, 255, 616, and about 1200+ yr-old andesitic soils at five depths and did adsorption isotherm experiments fit to a modified Langmuir equation. We measured DOC and DON in soil solution at the 10- to 20-, 40-, and 150-cm soil depths during the snowmelt period to compare with adsorption experiments. Ability of the soils to adsorb DOM increased with soil age. Regression analyses were performed between adsorption capacity or the null point concentration of either DOC or DON and the independent variables soil organic C (SOC), N, allophane, oxalate extractable Fe, crystalline Fe, and specific surface area. The best relationships were found between adsorption capacity and the allophane/SOC ratio (r2 = 0.88), and between the null point concentration of DOC or DON and the SOC/allophane ratio (DOC: r2 = 0.85; DON: r2 = 0.77). Stepwise multiple regression indicated that oxalate-extractable Fe and specific surface area contributed only small increases in the multiple R2. High correlations between the null-point adsorption of DOC or DON and the DOC (r2 = 0.92) or DON (r2 = 0.86) field soil solution concentrations indicated that results obtained in laboratory experiments were applicable to field conditions. The cause of the increased ability of the soils to adsorb and retain DOM during soil development appears to be an increase in allophane concentrations.
Abbreviations: DOC, dissolved organic carbon • DOCnp, null-point DOC concentration • DOM, dissolved organic matter • DON, dissolved organic nitrogen • DONnp, null-point DON concentration • Fe0, oxalate extractable iron • IM, initial mass • SOC, soil organic C • SSA, specific surface area • TN, total nitrogen
This article has been cited by other articles:
|
|
 |
|
  K. W. Goyne, H.-J. Jun, S. H. Anderson, and P. P. Motavalli Phosphorus and Nitrogen Sorption to Soils in the Presence of Poultry Litter-Derived Dissolved Organic Matter J. Environ. Qual., January 4, 2008; 37(1): 154 - 163. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 S. M. Uselman, R. G. Qualls, and J. Lilienfein Contribution of Root vs. Leaf Litter to Dissolved Organic Carbon Leaching through Soil Soil Sci. Soc. Am. J., August 9, 2007; 71(5): 1555 - 1563. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Rasmussen, N. Matsuyama, R. A. Dahlgren, R. J. Southard, and N. Brauer Soil Genesis and Mineral Transformation Across an Environmental Gradient on Andesitic Lahar Soil Sci. Soc. Am. J., January 1, 2007; 71(1): 225 - 237. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Rasmussen, M. S. Torn, and R. J. Southard Mineral Assemblage and Aggregates Control Carbon Dynamics in a California Conifer Forest Soil Sci. Soc. Am. J., September 29, 2005; 69(6): 1711 - 1721. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Lilienfein, R. G. Qualls, S. M. Uselman, and S. D. Bridgham Adsorption of Dissolved Organic and Inorganic Phosphorus in Soils of a Weathering Chronosequence Soil Sci. Soc. Am. J., March 1, 2004; 68(2): 620 - 628. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Journal of Natural Resources and Life Sciences Education |
Vadose Zone Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
