Prediction of Periodic Basal Area Increment for Young-growth Mixed Conifers in the Sierra Nevada
Prediction of Periodic Basal Area Increment for Young-growth Mixed Conifers in the Sierra Nevada

Author: K. Leroy Dolph

Publisher:

Published: 1988

Total Pages: 28

ISBN-13:

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Mixed-conifer forests are the largest vegetation type in California, covering more than 13 million acres (Barbour and Major 1977). This type, the Sierra Nevada Mixed Conifer (Society of American Foresters Forest cover type 243, Tappeiner 1980) dominates mid-elevations of the Sierra Nevada's western slopes. The extent of the mixed-conifer type and the amount of timber harvested from the west slopes of the Sierra Nevada emphasize the need for accurate growth and yield prediction methods for this area.

Predicting Height Increment of Young-growth Mixed Conifers in the Sierra Nevada
Predicting Height Increment of Young-growth Mixed Conifers in the Sierra Nevada

Author: K. Leroy Dolph

Publisher:

Published: 1988

Total Pages: 16

ISBN-13:

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Estimates of forest growth (increment) are used for evaluating productivity of land and to project growing stock into the future. Since volume is the accepted parameter for measuring forest growth (Spurr 1952), estimates of periodic volume increment for individual trees on inventory plots form the basis for appraising the productivity of the land and timber.

Seed Dissemination in Small Clearcuttings in North-central California
Seed Dissemination in Small Clearcuttings in North-central California

Author: Philip M. McDonald

Publisher:

Published: 1980

Total Pages: 796

ISBN-13:

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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.

Predicting Height to Crown Base for Undamaged and Damaged Trees in Southwest Oregon
Predicting Height to Crown Base for Undamaged and Damaged Trees in Southwest Oregon

Author: Mark L. Hanus

Publisher:

Published: 2000

Total Pages: 40

ISBN-13:

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Equations for predicting height to crown base are presented for tree species from southwest Oregon. Equations for undamaged and damaged trees were estimated with weighted nonlinear regression techniques. The effects of specific damaging agents on the height to crown base were explored, and damage correction factors were estimated. The damage correction factors can be used to correct the predicted crown ratio for specific damaging agents and their severity in samples where damage is noted. These equations are being incorporated into the new southwest Oregon version of ORGANON (ORegon Growth ANalysis and projectiON), a model for predicting the growth of individual trees in forest stands. The equations extend the past model to older stands and stands with a heavier component of hardwood tree species.