Multiscale influences on physical and chemical stream conditions across Blue Ridge landscapes. Scott, M. C.; Helfman, G. S.; McTammany, M. E.; Benfield, E.; and Bolstad, P. V. Journal of the American Water Resources Association, 2002.
Multiscale influences on physical and chemical stream conditions across Blue Ridge landscapes. [pdf]Paper  abstract   bibtex   
Streams integrate biogeochemical processes operating to broad to local spatial scales and long term to short term time scales. Humans have extensively altered those processes in North America, with serious consequences for aquatic ecosystems. We collected data on Upper Tennessee River tributaries in North Carolina to: (1) compare landuse and landscape geomorphology with respect to their ability to explain variation in water quality, sedimentation measures, and large woody debris; (2) determine if landscape change over time contributed significantly to explaining present stream conditions; and (3) assess the importance of spatial scale in examining landuse influences o streams. Stream variables were related to both landuse and landscape geomorphology. Forest cover accounted for the most variation in nearly all models, supporting predictions of nutrient enrichment, thermal pollution, and sedimentation caused by landscape disturbance. Legacy effects from past catchment disturbance were apparent in sedimentation measures. Nitrogen and phosphorus concentrations, as well as stream temperature, were lower where riparian buffers had reforested. Models of stream physicochemistry fit better when predictors were catchment wide rather than more localized (i.e., within 2 km of a site). Cumulative impacts to streams due to changes in landuse must be managed from a watershed perspective with quantitative models that integrate across scales.
@article{scott_multiscale_2002,
	title = {Multiscale influences on physical and chemical stream conditions across {Blue} {Ridge} landscapes.},
	volume = {38},
	url = {http://cwt33.ecology.uga.edu/publications/1531.pdf},
	abstract = {Streams  integrate biogeochemical processes operating to broad to local spatial scales  and long term to short term time scales. Humans have extensively altered those  processes in North America, with serious consequences for aquatic ecosystems. We  collected data on Upper Tennessee River tributaries in North Carolina to: (1)  compare landuse and landscape geomorphology with respect to their ability to  explain variation in water quality, sedimentation measures, and large woody  debris; (2) determine if landscape change over time contributed significantly to  explaining present stream conditions; and (3) assess the importance of spatial  scale in examining landuse influences o streams. Stream variables were related  to both landuse and landscape geomorphology. Forest cover accounted for the most  variation in nearly all models, supporting predictions of nutrient enrichment,  thermal pollution, and sedimentation caused by landscape disturbance. Legacy  effects from past catchment disturbance were apparent in sedimentation measures.  Nitrogen and phosphorus concentrations, as well as stream temperature, were  lower where riparian buffers had reforested. Models of stream physicochemistry  fit better when predictors were catchment wide rather than more localized (i.e.,  within 2 km of a site). Cumulative impacts to streams due to changes in landuse  must be managed from a watershed perspective with quantitative models that  integrate across scales.},
	number = {5},
	journal = {Journal of the American Water Resources Association},
	author = {Scott, Mark C. and Helfman, Gene S. and McTammany, Mathew E. and Benfield, E.F. and Bolstad, P. V.},
	year = {2002},
	keywords = {CWT}
}
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