Soil phosphorus forms in hydrologically isolated wetlands and surrounding pasture uplands

Cheesman, Alexander W., Dunne, Ed J., Turner, Benjamin L., and Reddy, K. Ramesh (2010) Soil phosphorus forms in hydrologically isolated wetlands and surrounding pasture uplands. Journal of Environmental Quality, 39 (4). pp. 1517-1525.

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Newly created and restored wetlands play an important role in sequestering excess nutrients at the landscape scale In evaluating the long-term efficacy of nutrient management strategies to increase wetland capacity for sequestering P, information is needed on the forms of P found across the upland-wetland transition To assess this, we studied soils (0-10 cm) from four wetlands within cow-calf pastures north of Lake Okeechobee, FL Wetlands contained significantly (P < 0.05) greater concentrations of organic matter (219 g C kg(-1)), total P (371 mg P kg(-1)). and metals (Al, Fe) relative to surrounding pasture When calculated on an aerial basis, wetland surface sods contained significantly greater amounts of total P (236 kg ha(-1)) compared with upland soils (114 kg ha(-1)), which was linked to the concomitant increase in organic matter with increasing hydroperiod The concentration of P forms. determined by extraction with anion exchange membranes, I mol L(-1) HCl, and an alkaline extract (0 25 mol L(-1) NaOH and 50 mmol L(-1) ethylenediaminetetraacetic acid [EDTA]) showed significant differences between uplands and wetlands but did not alter as a proportion of total P Speciation of NaOH-EDTA extracts by solution (31)P nuclear magnetic resonance spectroscopy revealed that organic P was dominated by phosphomonoesters in boils wetland and pasture sods but that myo-inositol hexakisphosphate was not detected in any sample The tight coupling of total C and P in the sandy sods of the region suggests that the successful management of historically isolated wetlands for P sequestration depends on the long-terns accumulation and stabilization of sod organic matter.

Item ID: 35617
Item Type: Article (Research - C1)
ISSN: 1537-2537
Funders: U.S. Department of Agriculture, Florida Department of Agriculture
Projects and Grants: U.S. Department of Agriculture CSREES 2004-35107-14918
Date Deposited: 01 Oct 2014 15:54
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050304 Soil Chemistry (excl Carbon Sequestration Science) @ 50%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050102 Ecosystem Function @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8398 Environmentally Sustainable Animal Production > 839899 Environmentally Sustainable Animal Production not elsewhere classified @ 100%
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