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| Author | : William F. McCambridge |
| Publisher | : |
| Total Pages | : 4 |
| Release | : 1982 |
| Genre | : Forest thinning |
| ISBN | : |
| Author | : Wayne D. Shepperd |
| Publisher | : |
| Total Pages | : 40 |
| Release | : 1983 |
| Genre | : Ponderosa pine |
| ISBN | : |
| Author | : Philip M. McDonald |
| Publisher | : |
| Total Pages | : 796 |
| Release | : 1980 |
| Genre | : Clearcutting |
| ISBN | : |
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 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.
