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An Additional Source Of Data On Northeastern Illinois Woodlands Around The Time Of Settlement, Jon Mendelson
An Additional Source Of Data On Northeastern Illinois Woodlands Around The Time Of Settlement, Jon Mendelson
Faculty Research and Creative Activity
A new source of data on early postsettlement woodlands, witness trees in woodlot subdivision surveys, is described. Subdivision surveys of Thorn Grove, Will County, Illinois (1848-1856), using 92 witness trees, are compared to the presettlement 1834 Public Land Survey (PLS) including the same area. The woodland described in the subdivision surveys was richer in species, lower in density and composed of smaller trees than the woodland described in the PLS. Decreased density and tree size suggest beginning deforestation, but surveyor bias is a possibility.
Age Structure Of Trees In Thorn Creek Woods, Jon Mendelson
Age Structure Of Trees In Thorn Creek Woods, Jon Mendelson
Faculty Research and Creative Activity
Diameter distributions and age-size regressions are presented for 11 tree species from Thorn Creek Woods, Will County, Illinois. Diameter distributions showed a good fit to the negative power model of survivorship. Nevertheless, 7 of the 11 species showed the 'gap-bulge" pattern, with fewer than expected numbers in intermediate size classes. Although age-size regressions were generally significant, the scatter diagrams for most species showed clustering into two age groups undetected by regression analysis. The juxtaposition of these results suggests the presence of two cohorts on the site; one of post-settlement origin (after 1835), the other emerging after the decline of agriculture …