. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. mostly from the northern two-thirds of the state (9 of 12 counties from the Northern Region, II of 31 counties from the Grand Prairie Region, 14 of 21 counties from the Western Region, 1 of 31 counties in the South-Central Region, and 3 of 7 counties in the Southern Unglaciated Region). County-by-county trends in forest area between 1962 and 1985 are shown in Figure 4. Clearly, forest area generally
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. mostly from the northern two-thirds of the state (9 of 12 counties from the Northern Region, II of 31 counties from the Grand Prairie Region, 14 of 21 counties from the Western Region, 1 of 31 counties in the South-Central Region, and 3 of 7 counties in the Southern Unglaciated Region). County-by-county trends in forest area between 1962 and 1985 are shown in Figure 4. Clearly, forest area generally increased in northern counties (especially those along the major river systems), while significant forest losses occurred in the southern portion of the state (with the exception of Shawnee National Forest counties). Forest Pattern and Trends in the South- Central Region To better understand the temporal and spatial patterns of forest patches in the South-Central Region, one 1990 Landsat TM scene, which covered all of 13 counties, was analyzed in detail (Figure 5). This region was FORESTS selected for intensive study because it was the only region where forest loss occurred from 1962 to 1985. The satellite data were at a resolution of 98 x 98 ft (30 m x 30 m), so that forest patches as small as approxi- mately acre ( ha) could be identified . The 16000. fj Southern unglaciated 0 South Central â¡ Western 0 Grand Prairie I Northern 7ZZ, z \ffââf\ *,fââf\ W, S / / f "~~~ 'â mm V>*/>/A 1820 1924 1948 1962 1985 Year Figure 3. Changes in forest area by region, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
Size: 1222px × 2045px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjecte, booksubjectecology, booksubjectman
