Graduate Thesis Or Dissertation
 

Growth in the lichen Lobaria oregana as determined from sequential photographs

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s1784p89x

Descriptions

Attribute NameValues
Creator
Abstract
  • The foliose lichen Lobaria oregana (Tuck.) Mti 11. Arg. is an important component of the upper canopy epiphyte community in oldgrowth Douglas fir forests of the Pacific Northwest. L. oregana contains the secondary phycobiont, Nostoc sp. , which is capable of fixing nitrogen. This thesis presents a new non-destructive method for estimating the biomass growth rates (g/yr) for L. oregana thalli of different dry weights. Six sequential photographs were made over a two year period of ten L. oregana thalli (and thallus lobes considered as thalli) in situ. The thallus area (cm²) of each photograph was measured. From a relationship between "photoarea" and dry weight of these ten thalli and 31 others [Equation (1)], the dry weight of each of the ten thalli was estimated through time. A growth rate was computed and a relationship between growth rate and initial thallus weight was determined Equation (2)] log₁₀(wt.) = -1, 87 + 1. 19 x 1og₁₀(photoarea) r = 0.98 (1) log₁₀(growth rate) = -0.424 + 0.834 x log₁₀(initial wt.) r = 0. 99 (2) From preliminary data on thalli distribution in the study tree, estimates of productivity of L. oregana and of fixed nitrogen are established, The study tree contained 7. 60 kg of L. oregana. These thalli produce 2. 56 kg of new thallus biomass per year for a turnover rate of 33. 7%. The fixed nitrogen added to the litter from the study tree each year in the form of L. oregana thalli is estimated at 41. 8 g.
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
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details RhoadesFrederick1975.pdf 2017-08-17 Public Download