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Hardwood Seedling Root and Nutrient Parameters for a Model of Nutrient Uptake

^a Dep. of Forestry, Iowa State Univ., Ames, IA 50011-1021
^b Tennessee Valley Authority, P.O. Box 920, Norris, TN 37838-0920

View larger version (34K): [in a new window]   Fig. 1. Changes during the second growing season in mean root length (cm) for black cherry, northern red oak, and red maple seedlings grown in pots containing A horizon soil from two forest sites, Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05)

View larger version (46K): [in a new window]   Fig. 2. Changes during the second growing season in mean root radius (cm) for black cherry, northern red oak, and red maple seedlings grown in pots containing A horizon soil from two forest sites, Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05)

View larger version (29K): [in a new window]   Fig. 3. Mean total plant weight (g) on each of five harvest dates for black cherry, northern red oak, and red maple seedlings grown in pots containing A horizon soil from two forest sites, Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05)

View larger version (36K): [in a new window]   Fig. 4. Mean plant total N, P, K, Ca, and Mg content (mmol) on each of five harvest dates for (a) black cherry, (b) northern red oak, and (c) red maple seedlings grown in pots containing A horizon soil from two forest sites, Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05). Note differences in the content scale for each species

View larger version (40K): [in a new window]   Fig. 5. Solution phase NO3–N, NH4–N, P, K, Ca, and Mg concentrations (µmol) on each of five harvest dates from (a) black cherry, (b) northern red oak, and (c) red maple pot soils from Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukeys HSD test (P = 0.05)

View larger version (53K): [in a new window]   Fig. 6. Solid phase NO3–N, NH4–N, P, K, Ca, and Mg concentrations (µmol) on each of five harvest dates from (a) black cherry, (b) northern red oak, (c) and red maple pot soils from Twin Creeks and Cove Mountain. Means within a species x site combination marked with the same letter are not different based on Tukey's HSD test (P = 0.05)

View larger version (13K): [in a new window]   Fig. 7. Relationship between seedling N content and root surface area across all species, soil sources, and harvest dates. A linear function provided the best fit to the data

View larger version (12K): [in a new window]   Fig. 8. Relationship between solution phase and solid phase K concentration across all species and harvest dates for the Cove Mountain soil. A power function provided the best fit to the data