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Phosphorus Exchangeability and Leaching Losses from Two Grassland Soils

^a Institute of Plant Sciences, Swiss Federal Institute of Technology Zürich (ETHZ), Postfach 185, CH-8315, Eschikon-Lindau, Switzerland
^b Institute of Terrestrial Ecology, ETHZ, Grabenstr. 3, CH-8952, Schlieren, Switzerland
^c Centre for Soil and Environmental Quality, P.O. Box 84, Lincoln University, Canterbury, New Zealand

View larger version (16K): [in a new window]   Fig. 1. Cumulative discharge of the four lysimeters in the first experiment (black points = observed data, lines = modeled data). L1 and L2 = Lismore lysimeters, T1 and T2 = Templeton lysimeters.

View larger version (25K): [in a new window]   Fig. 2. Concentrations of total phosphorus (Pt), dissolved reactive phosphorus (DRP), and Br in the first experiment (11 Jan. 2000). L1 and L2 = Lismore lysimeters, T1 and T2 = Templeton lysimeters. Note different scales for T2 compared with the other lysimeters.

View larger version (20K): [in a new window]   Fig. 3. Total (Pt), organic (Po), and inorganic phosphorus (Pi) (mg P kg-1) in stained and unstained areas of Templeton soil. For the letter pair a and b, the difference between stained and unstained areas is statistically significant at the 0.05 probability level, based on paired t tests. For the letter pair a and a, the difference between stained and unstained areas is not statistically significant at the 0.05 probability level, based on paired t tests.

View larger version (21K): [in a new window]   Fig. 4. Total (Pt), organic (Po), and inorganic phosphorus (Pi) (mg P kg-1) in stained and unstained areas of Lismore soil. For the letter pair a and b, the difference between stained and unstained areas is statistically significant at the 0.05 probability level, based on paired t tests. For the letter pair a and a, the difference between stained and unstained areas is not statistically significant at the 0.05 probability level, based on paired t tests.

View larger version (21K): [in a new window]   Fig. 5. Degree of phosphorus saturation (DPS, %) versus the concentration of P in soil solution (CP) and soil-P fixing capacity (R/r1) in Templeton (a and b) and Lismore (c and d) soils.

View larger version (25K): [in a new window]   Fig. 6. Comparison of water-soluble phosphorus (CP) as a function of depths for both Lismore and Templeton soils and the range of measured DRP values in the leachate.