Plant Sciences Commons^™

Gas Exchange Of Four Viburnum Species, Lisa Gayle De Berg

Dissertations and Theses @ UNI

In the natural environment, a plant's gas exchange and water use efficiency characteristics in response to environmental stresses such as vapor pressure deficit, temperature, light intensity, and water potential may vary according to physiological and morphological species differences, leaf types (deciduous or evergreen), and habitat types (northern and southern). In the field, laboratory, and growth chamber, the effect of vapor pressure deficit, temperature, and light intensity on gas exchange characteristics was investigated for four woody shrub species from the genus Viburnum. The species under investigation include: y. rhytidophyllum (northern evergreen), y. awabuki (southern evergreen), y. dentatum (northern deciduous), and y. …

Factors Related To The Occurrence Of Certain Prairie Graminoid Species In Black Hawk County, Iowa, Roadsides, Pauline Mary Drobney

Dissertations and Theses @ UNI

The native vegetation of Iowa was primarily tallgrass prairie and currently exists only in small isolated parcels, including some remnants occurring in roadsides. Roadside prairie remnants are important for historical, environmental, aesthetic, scientific, and economic reasons. Information about factors influencing the occurrance of roadside prairie vegetation could be useful to roadside vegetation managers in development of initial vegetation surveys and subsequent to restoration of roadside prairie vegetation.

This study was conducted to determine what factors most affected the percent coverage of prairie graminoids in roadsides; particularly soil moisture availability, drainage, soil disturbance, and availability of a prairie seed sources. Prairie …