Multiple research opportunities are available studying the ecohydrology of the eastern Edwards Plateau, a karst savanna. We are specifically interested in the water use patterns of woody vegetation, particularly of Ashe juniper, live oak, honey mesquite and several understory shrubs. Much is known about the function of savannas on deep soils, but on the Eastern Edwards Plateau, trees grow on extremely shallow soils, and often root cracked and fissured bedrock. This condition raises a number of interesting physiological, morphologigal, developmental and theoretical questions, which master's students are encouraged to pursue. Among these questions are: How does the morphology and physiology of roots in soil compare to roots in bedrock? How do trees function on shallow soils when the underlying bedrock excludes roots? How do tree seedlings and grasses compete when bedrock constrains taproot development? How do trees rooted in bedrock cope with drought conditions?
We are seeking a mathematically interested student to conduct a modeling study on the sustainability of dryland ranching systems. Worldwide, rangelands are degrading because of overstocking, inadequate drought response and counterproductive economic incentives. This study will examine what rational management strategies - if any - can prevent the downward spiral of desertification and preserve ecological assets for future generations. To apply, contact Dr.Susan Schwinning.
In collaboration with the Lady Bird Johnson Wildflower Center of Austin (Dr. Mark Simmons), we are seeking a student interested in the ecophysiology of
"green roofs"
. Green roofs add plants to the roof top environment bringing benefits of reflection, shading, insulation to the house and improve the quality of runoff water. They are small, self-contained ecosystems whose long-term dynamics are largely unknown. Green roofs are already in use in the temperate climate of Northern Europe, but their performance in drier, hotter regions is not well known. This project investigates how the multipsecies communities of green roofs function in the context of extreme precipitation variability and thin artificial root media. To apply, contact Dr.Susan Schwinning.
In collaboration with Dr. Dittmar Hahn, we are seeking a student interested in studying the ecophysiology of Nostoc commune, a terrestrial cyanobacterium that lives on the surfaces of shallow soils on the Edwards Plateau. This species fixes atmospheric nitrogen but its potential impact on the nitrogen economy of these sites has never been quantified. To apply, contact Dr.Susan Schwinning.
Students interested in pursuing any other field research project in Plant Ecology centered on the Edwards Plateau are encouraged to apply. Special consideration will be given to students with an interest in plant water relations, competition or ecohydrology. To discuss specific research opportunities, contact Dr.Susan Schwinning.
For information on application procedures, please go to the Department of Biology web pages on graduate studies.
