Persistent Link:
http://hdl.handle.net/10150/278609
Title:
Constraints on establishment of emory oak at lower treeline
Author:
Germaine, Heather Lynn, 1972-
Issue Date:
1997
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Encroachment of woody plants has occurred in many of the world's grasslands within the past 3 centuries. Mechanisms underlying these physiognomic shifts have not been adequately described. My objectives were to elucidate the roles of interference, herbivory, acorn maturation date and timing of precipitation on emergence and survival of Emory oak (Quercus emoryi Torr.) at lower treeline; and to evaluate how different frequencies of monitoring influence the results of demographic studies with woody plants. Seedling emergence was negatively affected by delays in precipitation and decreased soil moisture content. Seedling survival was negatively affected by overstory and understory interference and vertebrate herbivory. Most seedling mortality was attributed to desiccation. Woody plants should be monitored at least monthly to evaluate emergence and survival after one year. These results indicate that abiotic constraints are the primary factors structuring southwestern oak woodlands and savannas.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Biology, Ecology.; Agriculture, Forestry and Wildlife.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Renewable natural resources
Degree Grantor:
University of Arizona
Advisor:
McPherson, Guy R.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleConstraints on establishment of emory oak at lower treelineen_US
dc.creatorGermaine, Heather Lynn, 1972-en_US
dc.contributor.authorGermaine, Heather Lynn, 1972-en_US
dc.date.issued1997en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractEncroachment of woody plants has occurred in many of the world's grasslands within the past 3 centuries. Mechanisms underlying these physiognomic shifts have not been adequately described. My objectives were to elucidate the roles of interference, herbivory, acorn maturation date and timing of precipitation on emergence and survival of Emory oak (Quercus emoryi Torr.) at lower treeline; and to evaluate how different frequencies of monitoring influence the results of demographic studies with woody plants. Seedling emergence was negatively affected by delays in precipitation and decreased soil moisture content. Seedling survival was negatively affected by overstory and understory interference and vertebrate herbivory. Most seedling mortality was attributed to desiccation. Woody plants should be monitored at least monthly to evaluate emergence and survival after one year. These results indicate that abiotic constraints are the primary factors structuring southwestern oak woodlands and savannas.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectBiology, Ecology.en_US
dc.subjectAgriculture, Forestry and Wildlife.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineRenewable natural resourcesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorMcPherson, Guy R.en_US
dc.identifier.proquest1385749en_US
dc.identifier.bibrecord.b3746890xen_US
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