Date of Award
College of Science
Type of Degree
Frank S. Gilliam
This thesis contributes to on-going research at Marshall University on effects of excess nitrogen (N) deposition on hardwood forests. Excess N can decrease plant biodiversity and enhance loss of nutrients (e.g., Ca++). Preliminary results have suggested that excess N has increased cover of Rubus (blackberry) in the herbaceous layer. The purpose of this study was to quantify the response of Rubus to the N treatment, relating Rubus cover to species richness and using foliar analysis to examine effects on nutrient availability. It is expected that increased Rubus will decrease biodiversity by eliminating N-efficient species, and that added N will simultaneously increase foliar N and decrease foliar cations. Species richness decreased significantly with Nmediated increases in Rubus cover. Foliar tissue contained higher N and lower Ca++ from added N, suggesting loss via leaching with NO3 - . Observed increases of Rubus cover under a closed canopy is novel, considering its intolerance of shade
Forest ecology - Appalachian Region.
Hardwoods - Ecology.
Fernow Experimental Forest (Tucker County, W. Va.)
Billmyer, Jake H., "Effects of excess Nitrogen deposition on Rubus spp. (raspberry) within a central Appalachian hardwood forest" (2015). Theses, Dissertations and Capstones. 898.