Degree Type

Dissertation

Date of Award

1987

Degree Name

Doctor of Philosophy

Department

Botany

First Advisor

Donald R. Farrar

Abstract

An ecological survey of terricolous and corticolous bryophytes and lichens of a central Iowa forest was conducted. Species of these vegetation layers were recorded in permanent plots where the vascular plant communities were previously described. A microclimate analysis was conducted concurrently. North-facing slopes were found to be 6° cooler and wetter with 40% less evaporation than south-facing slopes. Terricolous bryophytes and lichens comprise a significant proportion of the total ground cover (37%) and species richness (26%) on north-facing slopes. This differed significantly from the cover (0.003%) and species richness (13%) on south-facing slopes. A total of 39 species were found. Species richness and cover was shown to be directly correlated to moisture as imposed by aspect. Distributions of corticolous bryophytes and lichens were analyzed for five phorophytes in three different vascular plant communities. Of thirty epiphyte species found, six species account for 80% of the cover. Quercus rubra had the highest cover and species richness of all the trees and the basswood vegetation type supported the highest cover of all vegetation types. Cover and richness of epiphytes were shown to be correlated primarily with microclimate and vascular plant communities and secondarily with the phorophyte species.

DOI

https://doi.org/10.31274/rtd-180813-12753

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Cindy Lee Johnson-Groh

Language

en

Proquest ID

AAI8805090

File Format

application/pdf

File Size

205 pages

Included in

Botany Commons

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