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Cart Diagnosis of Watershed Impairment in the Mid-Atlantic Region

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Abstract:Many factors ( stressors ) can lead to increased concentrations of nutrients and sediments, and these factors change across watersheds. Classification and Regression Tree (CART) is a statistical approach that can be used to "diagnose" which factors are important stressors on a per watershed basis. CART uses recursive partitioning to separate observations into groups. Numerous data sets were compiled for 477 watersheds in the mid-Atlantic region, including land cover, atmospheric deposition, hydrogpraphy, topography, and soils, along with nitrogen, phosphorus, and sediment loads. Results from the CART analysis identified 8 distinct groups of watersheds based on differences in the amount of atmospheric deposition, abundance of riparian land cover, abundance of forest land cover, and other factors.
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Citation:Neale, A. C., and K. B. Jones. Cart Diagnosis of Watershed Impairment in the Mid-Atlantic Region. Presented at Science Forum 2003, Washington, DC, May 5-7, 2003.
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Contact: Chris Siebert - (702) 798-2234 or siebert.christopher@epa.gov
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Division: Environmental Sciences Division
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Branch: Landscape Ecology Branch
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Product Type: Abstrct/Oral
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Presented: 05/05/2003
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Related Entries:
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Bullet Item Development of Landscape Indicators for Use in Regional Ecological Risk Assessments
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov