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Forms and Amounts of Soil Nitrogen and Phosphorus Across a Longleaf Pine–Depressional Wetland Landscape

^a School of Public and Environmental Affairs, Indiana Univ., Bloomington, IN 47405
^b Joseph W. Jones Ecological Research Center, Newton, GA 31770 and United Nations Environmental Programme, East Asian Seas Regional Coordinating Unit, 9th Floor, UN Building, Bangkok 10200, Thailand

View larger version (50K): [in a new window]   Fig. 1. Soil N fractions expressed on a volume basis at (a) 0–5 cm and (b) 20–25 cm across the wetland-ecotone-upland transect at Ichauway. Plant-available NH+4 and NO-3 refers to 2M KCl extraction fraction.

View larger version (36K): [in a new window]   Fig. 2. Soil P fractions expressed on a volume basis at (a) 0–5 cm and (b) 20–25 cm across the wetland-ecotone-upland transect at Ichauway.

View larger version (17K): [in a new window]   Fig. 3. (a) Plant-available (KCl-extractable) NO3-N and (b) organic N across the wetland-ecotone-upland transect at Ichauway. Means at transect points within the same depth followed by the same letter are not significantly different (P < 0.05) according to the Ryan-Einot-Gabriel-Welsh multiple range test.

View larger version (25K): [in a new window]   Fig. 4. Phosphorus fractions across the wetland-ecotone-upland transect at Ichauway. (a) Labile (NaHCO3–extractable) organic P, (b) humic acid-bound organic P, (c) total Fe- and Al-bound inorganic P and (d) total P. Means at transect points within the same depth followed by the same letter are not significantly different (P < 0.05) the Ryan-Einot-Gabriel-Welsh multiple range test.

View larger version (17K): [in a new window]   Fig. 5. (a) Soil C:N, (b) plant-available N:P and (c) total N:P across the wetland-ecotone-upland transect at Ichauway. Plant-available N:P is the ratio of KCl-extractable NH4-N +NO3-N/bicarbonate extractactable inorganic P. Means at transect points within the same depth followed by the same letter are not significantly different (P < 0.05) the Ryan-Einot-Gabriel-Welsh multiple range test.