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Abstract
A preliminary report of a statewide project investigating vegetation change in blue oak (
Quercus douglasii) woodlands in California is presented. Vegetation plots taken in the 1930s, as part of a statewide vegetation mapping project, were relocated and surveyed. Species composition, cover and tree stand structure data from the earlier study were compared with the current survey to determine the changes that have occurred in these woodland habitats. Twenty one plots were surveyed from south San Benito and eastern Monterey county rangelands. Changes of note included a general increase in total basal area of blue oak and foothill pine (
Pinus sabiniana), particularly due to an increase in small trees (4-11 DBH class). An increase in the percent cover of understory annuals including Avena species and
Bromus diandrus, and a decrease in
Bromus mollis and
Poa species were noted.
Parent Publication
Citation
Holzman, Barbara A.; Allen-Diaz, Barbara H. 1991. Vegetation Change in Blue Oak Woodlands in California. In: Standiford, Richard B., tech. coord. 1991. Proceedings of the symposium on oak woodlands and hardwood rangeland management; October 31 - November 2, 1990; Davis, California. Gen. Tech. Rep. PSW-GTR-126. Berkeley, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; p. 189-193
