Abstract
While phosphorus (P) sorption has been studied in Hawaii’s terrestrial soils, P sorption dynamics have yet to be investigated in coastal wetlands. In other coastal zones, wetlands have been shown to sorb P and act as P sinks at the land–sea interface. Thus, the objectives of this study were to examine variance in the P sorption index (PSI) within wetlands along hydrologic gradients and among wetlands of different types and to identify soil properties that best explain variability in the PSI. Forty wetlands on five islands were sampled and P sorption and related properties were measured. Phosphorus sorption index values ranged from −16.4–1,732.5. Hydrologic zone (within sites) and surface water salinity (among sites) accounted for significant proportions of the variance in the PSI. While texture, pH, and carbon content were found to be important predictors of PSI, the highest correlations were found for oxalate-extractable iron.
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