An associational study of Illinois sand prairie . Figure 11. A nearly typical blowout at the Devils basin is shov/n in the center, the windwardslope at the right, and the blowsand associationin the right back ground. The forest in thebackground is the black oak of the ridge betweenCrane Greek and the Black-jack 66 peculiar ant-lilco bug, is represented by several species. Like theplant life of the basin association, the animal life is very scanty,and represents the extreme conditions of combined effect of wind andsand. The V/indward Slope AssociationThe v/indv;ard slope of the
An associational study of Illinois sand prairie . Figure 11. A nearly typical blowout at the Devils basin is shov/n in the center, the windwardslope at the right, and the blowsand associationin the right back ground. The forest in thebackground is the black oak of the ridge betweenCrane Greek and the Black-jack 66 peculiar ant-lilco bug, is represented by several species. Like theplant life of the basin association, the animal life is very scanty,and represents the extreme conditions of combined effect of wind andsand. The V/indward Slope AssociationThe v/indv;ard slope of the blowout is quite steep, and the sandis continually sliding down by gravity. Usually the top of the slopeis held by plants of the bunch-grass growth which more often adjoinsthe blov^out (, ). In an active blowout the sand which fallsto the bottom of the slope is removed by the v/ind, and the windwardslope thus works its way back, enlarging the blov/out in the directionof the wind. No annual plants are found on the windward slope, as there is no chance for burial of seeds. The plants of the association are always in the form, of relics from the surrounding associations, usually bunch-grasses. In the Havana region, Sporobolus crypta idrus (Torr.) Gray is often found on the windv/ard slope. Most grasses are kille
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Keywords: ., bookcentury1900, bookdecade1910, bookidassocia, booksubjecttheses
