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Wetland mitigation in abandoned gravel pits.
  • Published Date:
    2010-03-01
  • Language:
    English
Filetype[PDF-811.48 KB]


Details:
  • Publication/ Report Number:
  • Resource Type:
  • Geographical Coverage:
  • OCLC Number:
    632333876
  • Edition:
    Final report.
  • NTL Classification:
    NTL-ENERGY AND ENVIRONMENT-Environment Impacts ; NTL-PLANNING AND POLICY-Land Use ;
  • Abstract:
    It is becoming increasingly difficult to provide on-site mitigation for wetland impacts due to road construction in

    northeastern Minnesota counties that retain greater than 80 percent of their pre-settlement wetlands. Abandoned

    gravel pits are one of the few remaining areas that can serve as wetland mitigation sites. The overall goal of the

    project is to develop cost-effective methods for creating functional mitigation wetlands on abandoned gravel pit

    sites to compensate for wetland impacts due to road construction. Two approximately 1-hectare wetland creation

    demonstration sites were established in adjacent abandoned gravel pits within the U.S. Trunk Highway 53

    reconstruction corridor to evaluate techniques for wetland establishment. Wet meadow and shrub swamp wetlands

    were attempted on one site, and wooded swamp and bog wetlands on the other. Wetland seed mixes provided both

    positive and negative effects on the developing plant communities on both sites initially but their effect was limited

    to the first year. Alder thicket and bog donor soil applications had positive effects but not until the third year of the

    study. Hardwood willow cuttings were effective for establishing a shrub component. Conifer seedlings did not

    survive unless planted on soil mounds. Fertilizer proved ineffective for promoting wetland plant growth during the

    study period. The use of straw mulch is questionable on saturated wetland sites such as those in this study.

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