oct21 - • After 1962 oaks have not declined but have not...

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10/21/09 Grasslands: increase in woody species historically (Prgl, Jumo, Acco) decline in herbaceous species more encroachment of honey mesquite in the early part of the 20 th century than in the latter part One seed juniper (Jumo) has increased steadily throughout the 20 th century Oak woodland: from late 1800s to 1962, oaks have— declined at their lower limits faster than they have established and there has been invasion of honey mesquite and one seed juniper
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Unformatted text preview: • After 1962 oaks have not declined but have not been replaced either • Oak woodlands have retreated to higher elevations • Upper elevation (colder temp) vs. lower elevation (dry soil) end factors that influence oak elevation • Conclusions—not primarily grazing or fire; possible global warming Overall decrease in grasslands and increase in woody shrubs in SW United States...
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