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Visual Counts of Acorns of California Black Oak (Quercus kelloggii) as an Indicator of Mast Production

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In 1995, acorn production of California black oak(Quercus kelloggii) was measured on 20 mature trees located in two stands in Placer County, California. Acorn production of each tree was measured using three 0.8 m² cone traps and a single 30 sec visual count. Visual counts were compared with trap data to develop statistical relationships between the two methods because visual counts have some advantages over traps, and we desired an efficient measure of the amount of acorns available as food for wildlife. Visual counts were positively correlated (P < 0.020) with several trap measures including wet acorn weight, weight of sound acorns, dry acorn weight, and total number of sound acorns. Linear regression of square-root transformed data found that visual counts could be used to predict total weight of sound acorns and total weight of dry acorns (P < 0.003). These results indicate that visual counts are adequate surrogates for more detailed measures of acorn production. West. J. Appl. For. 13(1):27-31.

Document Type: Journal Article

Affiliations: USDA Forest Service, Tahoe National Forest, Foresthill Ranger District, 22380 Foresthill Road, Foresthill, CA 95631

Publication date: January 1, 1998

More about this publication?
  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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