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Phosphorus Availability in an Artificially Flooded Southeastern Floodplain Forest Soil

^a Environmental Science and Public Policy Program, MS 5F2, George Mason Univ., Fairfax, VA 22030-4444
^b School of Forestry, Auburn Univ., Auburn Univ., AL 36849
^c Environmental Science and Public Policy Program, MS 5F2, George Mason University, Fairfax, VA 22030-4444

View larger version (14K): [in a new window]   Fig. 1. Map of the study site on the east bank of the Ogeechee River, Georgia (from Darke and Walbridge, 2000, with permission).

View larger version (21K): [in a new window]   Fig. 2. The effects of artificial flooding treatments on soil P availability as measured by daily P supply rate to in situ AER bags in field mesocosms. Brackets indicate periods of flooding. (A) CF = continuously flooded; (B) PF = periodically flooded; (C) MC = mesocosm control; (D) NC = nonmesocosm control; (E) FD = flooded–drained; and (F) +P and (G) +N, flooded–drained treatments with nutrients added. Lowercase letters indicate significant differences over time within a treatment (abc) (based on the method of least squares means with a Tukey adjustment [family error rate of P < 0.05]) and between flooding treatments at each monthly sample collection (xyz) (based on Tukey's simultaneous comparisons [family error rate of P < 0.05]).

View larger version (23K): [in a new window]   Fig. 3. The effects of artificial flooding treatments on resin-extractable Pi in field mesocosms. Brackets indicate periods of flooding. (A) CF = continuously flooded; (B) PF = periodically flooded; (C) MC = mesocosm control; (D) NC = nonmesocosm control; (E) FD = flooded–drained; and (F) +P and (G) +N, flooded–drained treatments with nutrients added. Lowercase letters indicate significant differences over time within a treatment (abc) (based on the method of least squares means with a Tukey adjustment [family error rate of P < 0.05]) and between flooding treatments at each monthly sample collection (xyz) (based on Tukey's simultaneous comparisons [family error rate of P < 0.05]).

View larger version (25K): [in a new window]   Fig. 4. The effects of artificial flooding treatments on soil microbial P in field mesocosms. Brackets indicate periods of flooding. (A) CF = continuously flooded; (B) PF = periodically flooded; (C) MC = mesocosm control; (D) NC = nonmesocosm control; (E) FD = flooded–drained; and (F) +P and (G) +N, flooded–drained treatments with nutrients added. Lowercase letters indicate significant differences over time within a treatment (abc) (based on the method of least squares means with a Tukey adjustment [family error rate of P < 0.05]) and between flooding treatments at each monthly sample collection (xyz) (based on Tukey's simultaneous comparisons [family error rate of P < 0.05]).