Effect of thinning and fertilization on wood properties and intra-ring characteristics in young Douglas-fir Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/p5547t785

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The purpose of this study was to determine if thinning, fertilization or a combination of thinning and fertilization had an effect on overall average specific gravity, modulus of elasticity, modulus of rupture, fiber length and intra-ring characteristics. Material for this experiment consisted of 7 trees randomly selected from each of two thinning/fertilization treatments and a control (unthinned and not fertilized) stand. Thus a total of 21 trees were involved. The trees were cut in the summer of 1982. Static bending tests were done on juvenile and mature wood from trees of all plots at the butt and at a height of 18 feet. Specific gravity and fiber length were also determined. The intra-ring parameters (earlywood width, latewood width, ring width, earlywood density, latewood density, ring density, minimum earlywood density, maximum latewood density, density range and percentage latewood) were determined by X-ray studies. Statistical analyses showed significant differences between treatments (thinning, or thinning/fertilization) in modulus of elasticity, modulus of rupture, fiber lengths and all the intra-ring parameters. Overall average specific gravity did not differ significantly among treatments but did between butt and top (18-foot height) wood values. Ring width and ring density seemed most influential on mechanical properties. Average modulus of elasticity for the samples tested were 10.6% (for the thinning/fertilization experiment) and 17.3% (for the thinning experiment) less than comparable values in the control plot. Average modulus of rupture for the samples tested were 6.3% (for the thinning/fertilization experiment) and 12.4% (for the thinning experiment) less than comparable values in the control plot. Age seemed to have the most influence on fiber length. Thinning treatments within the tree age-range of juvenile wood affected intra-ring parameters less than did such treatments in the age-range of mature wood. Fertilization by itself did not significantly increase tree growth (annual ring width).
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScanAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-07-21T20:17:13Z (GMT) No. of bitstreams: 1 BodnerJosef1984.pdf: 752242 bytes, checksum: 227a786d592ed2bbbd2c4cfdb6e277ab (MD5)
  • description.provenance : Made available in DSpace on 2010-07-21T20:17:13Z (GMT). No. of bitstreams: 1 BodnerJosef1984.pdf: 752242 bytes, checksum: 227a786d592ed2bbbd2c4cfdb6e277ab (MD5)
  • description.provenance : Submitted by Eric Hepler (ehscanner@gmail.com) on 2010-07-09T17:17:36Z No. of bitstreams: 1 BodnerJosef1984.pdf: 752242 bytes, checksum: 227a786d592ed2bbbd2c4cfdb6e277ab (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-07-21T20:15:00Z (GMT) No. of bitstreams: 1 BodnerJosef1984.pdf: 752242 bytes, checksum: 227a786d592ed2bbbd2c4cfdb6e277ab (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items