Sept4and9 - Sept 4th-heavy clay soils in playa lakes get large cracks in bottom-gilgai-patters of high and low lands in playa lakes w

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Sept. 4 th : -heavy clay soils in playa lakes get large cracks in bottom -gilgai-patters of high and low lands in playa lakes w/ cracks -ephemeral wetlands-playa lakes; wet then dry; cracking -the cracks tear up the root systems of grasses -probably don’t have mesquites and woody plants in basins because the roots can’t handle the cracking of the land -blue grama typically a bunch grass with spaces in between (does not cover like a mat) -grasslands in N. America: Great Plains—6 mil years old, plants have co-evolved and are use to the grazing so they can handle heavy grazing; long grazing history on great plains -when grazed buffalo grass & blue grama look the same but buffalo grass still has tiny hairs at the collar -purple threeawn is a bunch grass; very opportunistic; will grow in cracks in rocks -sand dropseed—inflorescence doesn’t get pushed out all the way up the stem; mid grass, flag leaf is the best way to tell: blows in the wind & hairy collar
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This note was uploaded on 11/14/2010 for the course NRM 3501 taught by Professor Wester during the Fall '09 term at Texas Tech.

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