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This article in SSSAJ

  1. Vol. 74 No. 5, p. 1808-1815
     
    Received: Oct 2, 2008
    Published: Sept, 2010


    * Corresponding author(s): jrwhite@lsu.edu
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doi:10.2136/sssaj2008.0316

Redistribution of Wetland Soil Phosphorus Ten Years after the Conclusion of Nutrient Loading

  1. Erin M. Bostica,
  2. John R. White *b,
  3. Ron Corstanjec and
  4. K.Ramesh Reddya
  1. a Soil and Water Science Dep, Univ. of Florida, Gainesville, FL 32611
    b Wetland & Aquatic Biogeochemistry Lab, Dep. of Oceanography and Coastal Sci., Louisiana State Univ., Baton Rouge, LA 70803
    c National Soil Resources Inst., Cranfield Univ., Cranfield, Bedfordshire, MK43 0AL, UK

Abstract

There is considerable concern about ecological recovery in wetlands that have been enriched with P; however, there are few long-term studies tracking the distribution of the soil P after the termination of P loading. The Blue Cypress Marsh Conservation Area in Florida contains areas with elevated soil P levels from historical loading. The local spatial variation of soil P was determined in a 750- by 150-m area proximal to the historic surface water inflow point and a second area of the same size located in the center of the marsh with no record of historical P impacts. The average soil total P was estimated at 847 mg kg−1 in the P-enriched area and 643 mg kg−1 in the marsh interior (unenriched). When compared with previously determined historical data, it was estimated that soil P has decreased in the P-enriched area by about 61%. Meanwhile, there was an increase of 82% in P within the unenriched area during this same time period. These results suggest that P has been mobilized from the impacted areas toward the unimpacted marsh along the water flow patterns in the wetland. These observations have implications for restoration of high-P wetland systems. Remobilization from P-impacted to unimpacted areas can expand the area of increased nutrients despite termination of P inputs into the marsh. If remobilization predominates over burial, then it is also unlikely that the overall nutrient status of the system will return to pre-impact levels within a reasonable management time frame (<25 yr).

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