Final - Final 11/9 California grasslands Central valleys of...

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Final 11/9 California grasslands: Central valleys of CA, surrounding low foothills, sea level to 4000 ft 18-40” ppt annual Mediterranean rainfall pattern: o Cool wet winters, hot dry summers o Originally: Purple needlegrass Nassella pulchra Nodding needlegrass Nassella cernua California oatgrass Danthonia californica *all cool season** Prairie junegrass Koeleria macrantha Squirreltail Elymus elymoides Tufted hairgrass Deschampsia caespitosa Settlement History: Mission activity 1769-1823 Spanish colonists Prior herbivory: pronghorn and deer Then domestic livestock by 1824, Gold rush in 1849 ^ Considerable disturbance CA area settled at least 100yrs before SGP CA: SGP: PC bunch grass PW most have stolons, rhizomes
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no stolons rhizomes late 1700s late 1800s Herbivory: lite no evolutionary history Herbivory: long history of bison grazing of grazing CA grasslands after 200 yrs of abuse from settles Currently: Avena fatua, Avena barbata, Bromus mollis, Bromus diandrus, Erodium spp, Medicago hispida, Taeniatherum caput-medusea Annual species now because of climax Less that 5% of original vegetation remains Plant succession?? Climax-product of climate, what climate can support dictates major growth form, dynamic equilibrium Palouse prairie: 18-25” annual ppt Mediterranean pattern See map Originally: Bluebunch wheatgrass Elymus spicatus Idaho fescue Festuca idahoensis Sandburg bluegrass Poa secunda Prairie junegrass Koeleria macrantha Needleandthread Hesperostipa comata Sagebrush Artemisia spp.
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Now mostly commercial wheat CA grasslands and Palouse prairie have disappeared 11/13 Palouse Prairie: CA Chaparral: (shrubs) -rings around the grasslands in the lower elevation, chaparral is higher elevation -AZ chaparral as well Chaparral: Sclerophyllous vegetation (relatively small, tough, evergreen leaves) Closely spaced shrubs, 1-4m tall “True” chaparral: 1600-4100ft elevation Mediterranean climate, 10-50 in per year Above 4100 ft, “fire induced” chaparral
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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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Final - Final 11/9 California grasslands Central valleys of...

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