Impact of competitor species composition on predicting diameter growth and survival rates of Douglas-fir trees in southwestern Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/ks65hc72k

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Mixed conifer and hardwood stands in southwestern Oregon were studied to explore the hypothesis that competition effects on individual-tree growth and survival will differ according to the species comprising the competition measure. Likewise, it was hypothesized that competition measures should extrapolate best if crown-based surrogates are given preference over diameter-based (basal area based) surrogates. Diameter growth and probability of survival were modeled for individual Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees growing in pure stands. Alternative models expressing one-sided and two-sided competition as a function of either basal area or crown structure were then applied to other plots in which Douglas-fir was mixed with other conifers and (or) hardwood species. Crown-based variables outperformed basal area based variables as surrogates for one-sided competition in both diameter growth and survival probability, regardless of species composition. In contrast, two-sided competition was best represented by total basal area of competing trees. Surrogates reflecting differences in crown morphology among species relate more closely to the mechanics of competition for light and, hence, facilitate extrapolation to species combinations for which no observations are available.
Resource Type
Date Available
Date Issued
Citation
  • Felipe Bravo, David W. Hann, and Douglas A. Maguire. 2001. Impact of competitor species composition on predicting diameter growth and survival rates of Douglas-fir trees in southwestern Oregon. Canadian Journal of Forest Research 31: 2237-2247.
Academic Affiliation
Series
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Caryn Davis(caryn.davis@oregonstate.edu) on 2010-02-20T01:10:13Z (GMT) No. of bitstreams: 1 01Bravo_etal.pdf: 598089 bytes, checksum: 8b5bf145b61be7e51772843f3790d763 (MD5)
  • description.provenance : Submitted by Alexa Pinckard (pinckara@onid.orst.edu) on 2010-02-20T01:05:29Z No. of bitstreams: 1 01Bravo_etal.pdf: 598089 bytes, checksum: 8b5bf145b61be7e51772843f3790d763 (MD5)
  • description.provenance : Made available in DSpace on 2010-02-20T01:10:13Z (GMT). No. of bitstreams: 1 01Bravo_etal.pdf: 598089 bytes, checksum: 8b5bf145b61be7e51772843f3790d763 (MD5) Previous issue date: 2001

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items