nov2 - Arizona hillside C12 and C13 consistent w depth...

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11/2/09 Arizona hillside: C12 and C13 consistent w/ depth Grasslands relatively stable Use to be more grasses in the past
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Conflicting evidence woody growth moving up or down in elevation? Different time frames for McPherson vs. Hastings and Turner Summary: Changing land use patterns (domestic vs. native herbivores, overgrazing) Change in fire frequency (fewer, less extensive fires, now than historically) Changes in climate (temperature, ppt CO2) What are the changes? Woody plant expansion? or increase in existing population? upward movement? downward movement? Must be species and region specific And based on what evidence? Anecdotal? Photography? Data(science)? Domestic vs. Native herbivores Rapid expansion of domestic livestock in late 1880s and communicate changes in vegetation suggest an association Livestock certainly disperse seeds Grazing can debilitate perennial grasses But shrubs often continue to increase even after livestock reduction
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