Assessing the influence of silvicultural practices on Douglas-fir nutrition and stemwood production Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nv935565f

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Nitrogen, phosphorus and sulfur concentrations were measured in the soil, foliage and litter of Douglas-fir growing in pure Douglas-fir and mixed conifer stands. On four sites of contrasting fertility and climatic conditions, plots had been modified by the introduction of alder, thinning, or by a single application of nitrogen fertilizer and thinning. Samples were taken to look for differences between plots in soil, foliage and litter nutrient concentrations arid ratios. Changes in canopy leaf area and wood production efficiency. were calculated from estimates of stemwood diameter and sapwood area. Wood production efficiency, an index of stemwood production per unit of leaf area, remained steady or increased under all treatments, despite shading from higher canopy leaf areas. On the less fertile Washington and Vancouver Island sites, the alder/conifer plots, with higher concentration up to a certain 'threshold level', above which higher nitrogen concentrations did not increase wood production as significantly. Stemwood production also tended to increase with higher N:P ratios and then leveled off above a ratio of twelve. A nitrogen use efficiency was calculated as the amount of stemwood produced per unit of N in the foliage. Although higher foliar nitrogen values correlated with higher wood production/m2 on the poorer quality sites, the nutrient use efficiency tended to be lower when the nitrogen concentration per m2 was more than about three grams per m2. Stemwood production per m2 of foliage tended to increase with higher foliar N:P ratios, but the correlation coefficient was low. Soil N (mineralizable and total) plotted against against foliar N/m2 produced a coefficient of .7. Oregon coast site data alone showed a significant correlation between foliar N and percent N retranslocation (r = .94) and between foliar P and percent P retranslocation (r = .91).
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by Anna Opoien (aoscanner@gmail.com) on 2009-03-18T23:12:44Z No. of bitstreams: 1 Reid_Paula_W_1984.pdf: 388465 bytes, checksum: bdb63e8635471de35f3d8d8e0c8315ea (MD5)
  • description.provenance : Made available in DSpace on 2009-03-26T14:18:55Z (GMT). No. of bitstreams: 1 Reid_Paula_W_1984.pdf: 388465 bytes, checksum: bdb63e8635471de35f3d8d8e0c8315ea (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-03-26T14:17:44Z (GMT) No. of bitstreams: 1 Reid_Paula_W_1984.pdf: 388465 bytes, checksum: bdb63e8635471de35f3d8d8e0c8315ea (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-03-26T14:18:55Z (GMT) No. of bitstreams: 1 Reid_Paula_W_1984.pdf: 388465 bytes, checksum: bdb63e8635471de35f3d8d8e0c8315ea (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items