Diameter and height increment and mortality functions for loblolly pine trees in thinned and unthinned plantations

Simple item page
dc.contributor.authorSmith, Michael C.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T21:32:23Zen
dc.date.adate2009-03-24en
dc.date.available2014-03-14T21:32:23Zen
dc.date.issued1994en
dc.date.rdate2009-03-24en
dc.date.sdate2009-03-24en
dc.description.abstractAlthough there remains some controversy as to the benefits of individual tree growth and yield prediction models over stand-level models, individual tree models still have wide acceptance. A generalized thinning response variable which can account for the intensity of thinning, as well as the age of the stand at the time of thinning and the time elapsed since thinning, was applied to two existing models for loblolly pine (Pinus taeda) in cutover site-prepared plantations. A site index equation for predicting mean total height of dominant and co-dominant trees and a diameter increment model were developed to incorporate the thinning response variable. New fits of height increment and mortality functions to the available data were also completed. Separate mortality functions were fit to data from unthinned and thinned stands. The base models for this analysis were from the individual tree growth simulation model PTAEDA2. Evaluations for predictive ability of these models were done in a reduced version of the growth simulator which was modified to accept external data. The mean total height model had improved predictive ability over the original PTAEDA2 model for this variable. The diameter increment model produced no significant improvement in simulation comparisons. Fitting the two mortality functions to the multiple observation data resulted in the reduced predictive ability of the simulator compared to the original mortality model from PTAEDA2 which was fit to data from unthinned stands only.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 138 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03242009-040942en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03242009-040942/en
dc.identifier.urihttp://hdl.handle.net/10919/41788en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.S661.pdfen
dc.relation.isformatofOCLC# 31467646en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.S661en
dc.subject.lcshLoblolly pine -- Growth -- Mathematical modelsen
dc.subject.lcshLoblolly pine -- Thinning -- Mathematical modelsen
dc.titleDiameter and height increment and mortality functions for loblolly pine trees in thinned and unthinned plantationsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1994.S661.pdf
Size:
5.27 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Masters Theses