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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