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Title: Canopy structure and tree condition of young, mature, and old-growth Douglas-fir/hardwood forests

Author: Bingham, B.B.; Sawyer, J.O. Jr.;

Date: 1992

Source: Pages 141-149 in: Harris, R.R.; Erman, D.E., (Technical Coordinators). Proceedings of the Symposium on Biodiversity of Northwestern California; 1991 October 28-30, Santa Rosa, CA. Berkeley, CA: University of California, Wildland Resources Center Report No. 29

Publication Series: Miscellaneous Publication

Description: Sixty-two Douglas-fir/hardwood stands ranging from 40 to 560 years old were used to characterize the density; diameter, and height class distributions of canopy hardwoods and conifers in young (40 -100 yr), mature (101 - 200 yr) and old-growth (>200 yr) forests. The crown, bole, disease, disturbance, and cavity conditions of canopy conifers and hardwoods were also described. A series multivariate and univariate analyses were used to determine which tree conditions differed significantly among the age-classes. Stepwise discriminant analysis was used to identify variables with significant discriminatory power. Several conditions of canopy trees, including the percentage of trees with broken-topped crowns, the percentage with conks, the percentage with fire scars, and the percentage with basal cavities showed significant differences. Most conditions had their highest values in old-growth. The greatest difference among the age classes was in the percentage of canopy conifers with fire-blackened bark. An average of 68% of the canopy conifers had fire-blackened bark. A summary of the average canopy structure and tree condition of old-growth should provide additional criteria for defining old-growth Douglas-fir/hardwood forests.

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Bingham, B.B.; Sawyer, J.O., Jr. 1992. Canopy structure and tree condition of young, mature, and old-growth Douglas-fir/hardwood forests. Pages 141-149 in: Harris, R.R.; Erman, D.E., (Technical Coordinators). Proceedings of the Symposium on Biodiversity of Northwestern California; 1991 October 28-30, Santa Rosa, CA. Berkeley, CA: University of California, Wildland Resources Center Report No. 29

 


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