56 



lands. Under this practice a sod is formed which effectively keeps out 

 the reproduction necessary to replace the trees harvested. The presence 

 of a sod. the lack of young trees to continue the forest, and the presence 

 of timber of sawlog size tempt the owner to clear his land immediately 

 rather than by the equally certain and slower process of grazing the 

 woodlands. 



The number of trees per acre and the representation of species in the 

 stands by per cents for this oak-hickory subtype is shown in the tabula- 

 tion on page oi. 



Samples from fully stocked stands are shown (I, II, III, IV, V) as 

 follows. 



I. A 62-YEAR OLD St.\nd, Whiteside County 



Species 



No. of trees per acre. 

 Av. D. B. H., inches. 

 Av. height, feet. . . . 

 Cu. ft. per acre. . . . 

 B. F. per acre 



White 

 oak 



132 



8.0 



70 



1,440 



2,134 



Black 

 oak 



49 



11.8 



70 

 1,029 

 1,957 



Hickory 



Black 

 cherry 



6 



6.7 

 65 

 46 

 41 



6 



13.0 



70 

 152 

 346 



2,668 

 4,478 



Av. ann. 

 growth 



II. An 85-year old Stand. Mercer County 



Species 



Av. ann. 

 growth 



No. of trees per acre. 

 Av. D. B. H., inches. 

 Av. height, feet. . . . 

 Cu. ft. per acre. . . . 

 B. F. per acre 



33.5 

 84 



IV. An 80-year old Stand, Piatt County 



Species 



No. of trees per acre 

 Av. D. B. H., inches. 



Av. height, feet 



Cu. ft. per acre 



B. F. per acre 



White 

 oak 



71 



13.8 



70 

 2,062 

 5,309 



Black 

 cherry 



3 



6.3 

 35 

 15 



6 



6.7 

 35 

 16 



2,093 

 5,109 



Av. ann. 

 growth 



26.2 

 66 



