A multi-scale approach to prioritize wetland restoration for watershed-level water quality improvement

dc.contributor.author

Flanagan, N

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Richardson, CJ

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2017-11-01T16:09:31Z

dc.date.available

2017-11-01T16:09:31Z

dc.date.issued

2010-12-01

dc.description.abstract

Wetland restoration is commonly presented as an important strategy for maintaining and enhancing the water quality and ecological capital of watershed-scale ecosystems. Prioritizing restoration sites on the landscape is often a haphazard process based on widely held, though often untested, assumptions about relationships between watershed characteristics and water quality. We present a framework to target and prioritize wetland restoration locations using both regional and watershed-level screening models. The regression-tree and random forest models presented in this paper identify watershed variables with the strongest relationships to a given water quality parameter, present a clear hierarchy of variable importance, and present approximate thresholds in watershed area where these variables express the greatest impact on water quality. The proportion of watersheds classified as prior-converted agricultural land was an important predictor of both ortho and total phosphorus. Fortunately because prior-converted agricultural lands were historically wetlands, they are often very suitable for wetland restoration. These sites often have poorly-drained soils requiring artificial drainage to be suitable for agriculture. These drainage systems become conduits for transporting phosphorus from agricultural field and to area streams and rivers. Maintaining natural land-cover within stream buffers is identified as another important predictor of water quality. This seems to be especially true with regard to NO 3 -NO 2 concentrations. Our model results support specific management recommendations including: (a) exclusion of agricultural land-uses from riparian buffers, (b) maintaining or increasing watershed-level wetland-cover and (c) reducing wetland fragmentation. © 2010 Springer Science+Business Media B.V.

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0923-4861

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https://hdl.handle.net/10161/15723

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Springer Science and Business Media LLC

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Wetlands Ecology and Management

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10.1007/s11273-010-9188-9

dc.title

A multi-scale approach to prioritize wetland restoration for watershed-level water quality improvement

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Journal article

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695

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706

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6

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Duke

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Environmental Sciences and Policy

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Marine Science and Conservation

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Nicholas School of the Environment

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Published

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18

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