HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Lilienfein, J. Articles by Bridgham, S. D. Search for Related Content PubMed Articles by Lilienfein, J. Articles by Bridgham, S. D. GeoRef GeoRef Citation Agricola Articles by Lilienfein, J. Articles by Bridgham, S. D. Related Collections Phosphorus Sorption/Exchange Volcanic 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

View larger version (25K): [in a new window]   Fig. 1. Dissolved organic P (DOP) adsorption isotherms of Mt. Shasta mudflow soils at depths of (a) 0 to 10 cm, (b) 30 to 40 cm, and (c) 140 to 150 cm. Lines are fitted according to the Langmuir equation (Eq. [4]), r2 ranged from 0.91 to 0.99.

View larger version (22K): [in a new window]   Fig. 2. Regression analysis for (a) the adsorption capacity for DOP and the age of the soils and (b) the slope of the adsorption isotherm of PO4 and the age of the soils.

View larger version (28K): [in a new window]   Fig. 3. Orthophosphate adsorption isotherms of Mt. Shasta mudflow soils at depths of (a) 0 to 10 cm, (b) 30 to 40 cm, and (c) 140 to 150 cm. Lines are linear regressions and are indicated on the figure.

View larger version (20K): [in a new window]   Fig. 4. Regression analysis between (a) the adsorption capacity for DOP and allophane concentrations and (b) the slope of the PO4 adsorption isotherms and allophane concentrations in the soils.

View larger version (21K): [in a new window]   Fig. 5. Phosphate/DOP ratio in the equilibrium solution of the most concentrated initial solution (292 µg DOP L–1 and 696 µg PO4 L–1). The dashed line represents the PO4/DOP ratio in the initial solution. Asterisk (*) indicates a significant difference in the PO4/DOP ratio in the equilibrium solution as compared with the initial solution (p 0.05, two-tailed single sample paired t test); different letters indicate significant differences in the PO4/DOP ratio among soils of different age and within one soil depth (P < 0.05, Tukey's HSD test).

View larger version (42K): [in a new window]   Fig. 6. The DOC/DOP ratio in the equilibrium solution of the most concentrated initial solution (200 mg DOC L–1 and 292 µg DOP L–1). The dashed line represents the DOC/DOP ratio in the initial solution. Asterisk (*) indicates a significant difference in the PO4/DOP ratio in the equilibrium solution as compared with the initial solution (p 0.05, two-tailed single sample paired t test); different letters indicate significant differences in the PO4/DOP ratio among soils of different age and within one soil depth (P < 0.05, Tukey's HSD test).

View larger version (19K): [in a new window]   Fig. 7. Regression analysis between the soil solution concentration of (a) DOP and (b) PO4 at 10-, 16-, or 20-, 40-, and 150-cm soil depth and the null-point DOP and PO4 concentration in soil samples from 0- to 10-, 30- to 40-, and 140- to 150-cm soil depth. The dashed line in 7(b) shows the regression analysis, excluding the influential point (77 yr-old soil, 0–10 cm).