A Comparison of Distance-Dependent Competition Measures for Height and Basal Area Growth of Individual Conifer Trees
The effect of competition on height and diameter² growth of individual conifer trees was examined. In this paper we modeled growth of individual trees as a product of potential growth reduced by competition. We investigated a number of competition indices that incorporate tree sizes and distances from neighbors, evaluated over varying competition zones. For these indices the reduction in mean square error relative to no competition index was used to judge performance. The performance of these indices varies by species and growth component (height or diameter² growth), but performance was generally better for tolerant white fir than for intolerant ponderosa pine. Additional competition measures that incorporate estimated crown parameters were developed and shown to improve on many of the traditional competition measures especially for ponderosa pine and Douglas-fir. For white fir, basal area performed well, but not as well as the individual tree competition indices that incorporate estimated crown parameters. We found that expanding the search zone did not improve our ability to estimate competitive effects. Choosing competitors with a height angle gauge was generally superior to selecting them with a DBH angle gauge. Results are summarized by species, type of competition index, and competition evaluation zone. For. Sci. 38(3):695-720.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Journal Article
Affiliations: Graduate Student Researcher, University of California, Berkeley 94720
Publication date: 1992-08-01
More about this publication?
- Important Notice: SAF's journals are now published through partnership with the Oxford University Press. Access to archived material will be available here on the Ingenta website until March 31, 2018. For new material, please access the journals via OUP's website. Note that access via Ingenta will be permanently discontinued after March 31, 2018. Members requiring support to access SAF's journals via OUP's site should contact SAF's membership department for assistance.
Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
Forest Science is published bimonthly in February, April, June, August, October, and December.
2016 Impact Factor: 1.782 (Rank 17/64 in forestry)
Average time from submission to first decision: 62.5 days*
June 1, 2016 to Feb. 28, 2017
Also published by SAF:
Journal of Forestry
Other SAF Publications
- Submit a Paper
- Membership Information
- Author Guidelines
- Ingenta Connect is not responsible for the content or availability of external websites