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at the single-section scale. Investigations of the results at larger scales are scarce. A nationwide-scale assessment estimated that one-fifth of the U.S. land area is directly affected ecologically by public roads , even though the paved road network covers lower than 1% of the U.S. land area. With rising availability of digital biophysical and land-use data, geographic data system tools and functions are becoming broadly used amongst useful resource managers and transportation planners for amassing data and modeling the potential effects of roads at a number of scales Dale . The hottest product hippie guitar colorful all over printed hawaiian shirt 1994, Tinker . 1998, Vos and Chardon 1998, Clevenger . 2002a. The increased use of GIS will probably facilitate more GIS-based mostly research that consider the ecological effects of roads at regional and national scales. Because roads are impervious, runoff from them is bigger than that from most unconstructed land cover sorts. As mentioned earlier, this runoff often accommodates pollution from the highway and the vehicles on it. jacent habitats. The sensible elements of nonnative plant management and different resource points are mentioned further in Chapter 4.
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