Illinois Natural History Survey - University of Illinois

Table 1. Changes in size and shape for nine Illinois hill prairies between about 1940 and 1988.

Site and County Ownership Grazing & Burning History Date of Photo Area (square hectares) P/A ratio P/A ratio index No. of units Proportion of original area
Bland (Greene) Private moderately grazed, not burned 1938 2.04 .0351 1.42 1 1.0
      1968 1.12 .0626 1.87 1 .550
      1988 0.65 .1221 2.76 1 .319
Clendenny (Calhoun) Private moderately grazed 1940 3.97 .0574 3.22 1 1.0
      1950 3.77 .0689 3.77 1 .949
      1968 3.45 .0741 3.88 1 .868
      1988 2.52 .0807 3.61 1 .633
Fults (Monroe) State, Nature Preserve not grazed, burned regularly since the 1970s 1940 7.20 .0633 4.80 2 1.0
      1962 5.73 .0785 5.30 6 .797
      1988 3.35 .1169 6.04 9 .466
Jennings (Calhoun) Private, Natural Heritage Landmark no grazing for ca. 25 years, burning began in 1990s 1940 2.16 .1081 4.48 1 1.00
      1950 1.65 .1301 4.71 2 .764
      1968 1.65 .1068 3.87 3 .765
      1988 0.99 .1509 4.24 3 .458
New Canton (Pike) Private probably not grazed, burning began in 1990s 1936 1.71 .0944 3.48 3 1.00
      1939 1.83 .1045 3.99 3 1.07
      1950 0.96 .1270 3.51 8 .563
      1968 1.53 .1250 4.36 8 .897
      1988 0.32 .1246 1.99 2 .212
Phegley (Randolph) Private intensively grazed, not burned 1940 2.65 .0543 2.49 1 1.00
      1952 2.21 .0615 2.58 2 .834
      1959 2.04 .0693 2.79 2 .770
      1971 0.97 .1455 4.04 8 .365
      1988 0.46 .1907 3.65 5 .175
Shewhart (Pike) Private grazed but not recently, not burned since at least 1928 1936 3.10 .0665 3.30 3 1.00
      1939 1.61 .0898 3.21 3 .516
      1950 2.05 .0840 3.39 4 .662
      1968 2.22 .0928 3.90 5 .714
      1988 0.79 .1572 3.94 7 .254
Witter's Bobtown*(Menard) [1988 photo obscured by evening shadows and eliminated from this analysis] Private, Nature Preserve not grazed recently, burned regularly now, brush removed 1939 1.99 .0300 1.19 1 1.00
      1950 1.17 .0400 1.22 1 .588
      1957 1.50 .0346 1.20 1 .752
      1969 1.31 .0421 1.36 1 .658
Revis (Mason) State, Nature Preserve not grazed recently, long history of fall burning, brush removed 1939 39.16 .0410 7.24 15 1.00
      1950 34.26 .0474 7.83 14 .875
      1957 32.06 .0558 8.91 16 .819
      1969 32.51 .0414 6.66 14 .830
      1988 17.37 .0813 9.56 22 .444

 



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