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Landscape Ecology vol. 8 no. 1 pp 39-61 (1993)
BibTeX
@MISC{Publishing_landscapeecology,
author = {Spb Academic Publishing and Naomi E. Detenbeck and Carol A. Johnston and Gerald J. Niemi},
title = {Landscape Ecology vol. 8 no. 1 pp 39-61 (1993)},
year = {}
}
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Abstract
A method developed to evaluate the cumulative effect of wetland mosaics on water quality was applied to 33 lake watersheds in the seven-county region surrounding Minneapolis-St. Paul, Minnesota. A geographic information system (GIS) was used to record and measure landscape variables derived from aerial photos. Twenty-seven watershed land-use and land-cover variables were reduced to eight principal componentswhich described 85 of the variance among watersheds. Relationships between lake water quality variables and the first six principal components plus an index of lake were analyzed through multiple regres- sion analysis. A combination of three landscape components area, and components) explained 49% of the variance in a trophic state index, even though most of the lakes examined were already highly eutrophic, and thus were influenced by internal loading. The regres- sion equations explained a range of 14to 76% of the variation in individual water quality variables. Forested land-use was associated with lower lake trophic state, chloride, and lead. High lake trophic state was associat- ed with agricultural land-use and with wetland distance from the lake of interest. The extent of wetlands was associated with low total lead and high color in lakes downstream. Wet meadows or herbaceous, flooded wetlands contributed more to lake water color than did cattail marshes. 1.
Keyphrases
landscape ecology vol cumulative effect landscape variable internal loading high color watershed land-use wetland mosaic multiple regres sion analysis aerial photo high lake trophic state land-cover variable water color wetland distance seven-county region individual water quality variable principal component water quality lake water quality variable agricultural land-use lake trophic state associat ed landscape component area lake downstream lake watershed trophic state index low total lead geographic information system
