Abstract
Plant community and soil development were investigakl on oil/gas drilth~g sites occupying hotb sagebrush and coniferous forest vegetation types in northw&em Wyoming. sites ranged from 3 to 33 years in age since abandonment. Some sites were seeded at abandonment, wbile others revegetakd naturally. Vegetation and soils were sampled and compared on distorhed and ad]acent undisturbed sitea. Both soils and vegetation were lltaed by drilling activities. Disturbed soils generally had higher bulk density and pH and lower organic matter content than ulistorbed soils. AU disturbed sites were vegetationally dissboilar to adjacent native sites. However, sagebrush disturbances were progressing toward undisturbed conditions more rapidly than coniferous forest disturbancea. seeding accelerated vegetation development, although at different rates between sagebrush and coniferous forest d&turbanceu. Seeding and establishment of introduced grass species on dkturbed sites did not prevent natural recolonization of native speck
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