. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 17. Changes in forest volume by county from 1962 to 1985, given in millions of cubic feet ofsawtim- ber. [Note: for 28 counties with no coded change, no specific data were available for 1962 volumes; overall these prairie counties, however, there was a 269% increase in volume between 1962 and 1985. J damage parameters; Illinois trees appear in good health compred to those in Southern, Mid-Atl
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 17. Changes in forest volume by county from 1962 to 1985, given in millions of cubic feet ofsawtim- ber. [Note: for 28 counties with no coded change, no specific data were available for 1962 volumes; overall these prairie counties, however, there was a 269% increase in volume between 1962 and 1985. J damage parameters; Illinois trees appear in good health compred to those in Southern, Mid-Atlantic and New England states (Table 3). Herbaceous Species Diversity The FHM study was used to measure floristic composi- tion and diversity among Illinois forests. Three 1-m2 quadrats were sampled for plant cover in each of four subplots at each site. The results indicated no differ- ences in overstory or understory species richness in forests differing in ownership category (public versus private), or in upland versus lowland forests (Table 4). Despite wide variation in the mean number of under- story species sampled (range: to ), under- story diversity did not correlate well with general characteristics of the forest plot (, overstory composition, tree density). Thus, although different forest types received different levels of management attention, no systematic differences in the ability of forest types to conserve forest health or species diversity were demonstrated. Further, this sampling. Figure 18. Number of standard cords offuelwood (X 1000) produced in each Illinois county, 1983. 44. 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
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