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Edition:Final report.
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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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