. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report Vy-.^f- i-r ,,r :i2V'^. t J' " »*»r v> .,'. ^J___^ ., 4';\?-»^ a.^- - J'. v ^•'' $^ op Figure 2. Distribution of 106 randomly selected forest sites used in the analysis. Approximately 14% of the state is in forest cover, compared to in 1920, and 38% in 1820, before large-scale European settlement (Bretthauer and Edgington 2002). (Fralish 1994). Due to the random n
. Critical trends assessment Program 2003-04 report. Critical Trends Assessment Project; Ecosystem management; Environmental monitoring; Natural resources surveys. Critical Trends Assessment Program 2003-2004 Report Vy-.^f- i-r ,,r :i2V'^. t J' " »*»r v> .,'. ^J___^ ., 4';\?-»^ a.^- - J'. v ^•'' $^ op Figure 2. Distribution of 106 randomly selected forest sites used in the analysis. Approximately 14% of the state is in forest cover, compared to in 1920, and 38% in 1820, before large-scale European settlement (Bretthauer and Edgington 2002). (Fralish 1994). Due to the random nature of the study design we sampled no true primary or old- growth forests, because such 150-250 year old relatively undisturbed forests are extremely rare in the state (see data within Iverson et al. 1989). Floral conservation value of each site was assessed using Floristic Quality Assessment (we use "floristic quality" synonymously with "floristic conservation value") (Swink and Wilhelm 1994, Taft et al. 1997). Conservative plants exhibit a high affinity for biologically undegraded, remnant habitats. Analysis of nestedness followed Matthews (2004). Relationships among site variables (species richness, stand-level basal area, and mean O were investigated using Pearson correlation coefficients. Patterns of individual species distribution with respect to site species richness, basal area, and mean C were investigated using Wilcoxon two-sample rank tests (Mann-Whitney U tests). Sites were rank-ordered by decreasing species richness, and. 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; Illinois. Natural History Survey Division; Critical Trends Assessment Project. [Illinois] : Illinois Dept. of Natural Resources, Office of Realty and Envi
Size: 2220px × 1125px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorillinoisnaturalhistorysurveydivision, bookcollectionb
