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    Author(s): Philip M. McDonald
    Date: 1980
    Source: Res. Paper PSW-RP-150. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture; 5 p
    Publication Series: Research Paper (RP)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (565 KB)


    In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to lOO,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1½ times the height of the average dominant tree. Overall, seed distribution was highly variable.

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    McDonald, Philip M. 1980. Seed dissemination in small clearcuttings in north-central California. Res. Pap. PSW-RP-150. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 5 p.


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    seed production, seed dispersal, clearcutting, Pinus ponderosa, Libocedrus decurrens, Pseudotsuga menziesii, Abies concolor, Challenge Experimental Forest

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