An associational study of Illinois sand prairie . f 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 killed as soon as they become dislodged from the face of the sand-bluff, but grow this species seem^s to.;y,nearly as well on the steep slope as in morestable sand in competition with other species. A few other grassesand a fev/ perennials are also occasionally found on the windward slopeThe tufts of gr
An associational study of Illinois sand prairie . f 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 killed as soon as they become dislodged from the face of the sand-bluff, but grow this species seem^s to.;y,nearly as well on the steep slope as in morestable sand in competition with other species. A few other grassesand a fev/ perennials are also occasionally found on the windward slopeThe tufts of grass are always very few and scattered - sometimes theT/holeiface of the slope is altogether bare. The grasses sometimesbecome a part of the basin association, after reaching the bottom ofthe slope but more often they are undermined and blown away. The animals of the v/indv/ard slope association are very fev/ indeedand the forms that are found are accidental species. Burrowing ani-mals are excluded, because of the instability of the sliding 67 :.:any animals, hov;ever, cross the windward slope areas, and practicall;iall the animals of the bare sand are seen there, particularly Gicin-dela lopida, Stachyocnemis, mutillids, and spiders. The windwardslope is very closely related to the basin association; the same pro-cess is involved in each association - the removal of sand - and thebiotic conditions approach those of the desert in each area.
Size: 1332px × 1875px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidassocia, booksubjecttheses
