College of Agriculture & Natural Resources

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The collections in this community comprise faculty research works, as well as graduate theses and dissertations.

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    Salinity and Inundation Tolerance of Phragmites australis ssp. americanus: A Greenhouse Experiment and Field Study on a Tributary of the Chesapeake Bay
    (2017) Leason, Diane Elizabeth; Baldwin, Andrew H; Environmental Science and Technology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Natural vegetation communities of tidal and non-tidal wetlands are threatened by invasive species, e.g. Phragmites australis (Cav.) Trin. Ex Steud., resulting in diversity losses and declines in wetland services. The native lineage of Phragmites, Phragmites australis ssp. americanus Saltonstall, P. M. & Soreng could be a valuable addition to species currently used in restoration projects aimed at increasing wetland services. However, tolerances of native Phragmites to environmental conditions are uncertain. Salinity and water level tolerances were investigated by monitoring growth of adult plants, established from rhizomes, under varying water and salinity levels in a greenhouse experiment and an observational study. Results show salinity levels above 5 ppt significantly limited growth of native Phragmites regardless of water level indicating appropriate restoration use across the marsh platform of fresh and oligohaline systems. Educational materials and demonstration sites were created to improve field identification of native Phragmites.
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    Healing Invisible Wounds: Landscapes for Wounded Warriors Suffering from Posttraumatic Stress Disorder (PTSD)
    (2013) Ashmun, Sarah C.; Sullivan, Jack; Plant Science and Landscape Architecture (PSLA); Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Characterized by pervasive symptoms of intrusion, numbing, and hyperarousal, coping with PTSD can be a tenacious and lifelong challenge for sufferers (Cahill and Foa 2010). Given the recent surge of war veterans resulting from Operations Enduring and Iraqi Freedom with a high prevalence of PTSD, landscapes may provide a free and accessible means for veterans to successfully cope with their PTSD symptoms and seek treatment. The intention of this project is to merge holistic therapies for PTSD with successful landscapes for trauma patients into the creation of adaptable design principles. Guiding Principles for PTSD will be incorporated into the design of a Healing Woodland for wounded warriors at the Walter Reed National Military Medical Center in Bethesda, Maryland, while also providing potential solutions for other sites aiming to incorporate holistic therapies for PTSD into the landscape.
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    VEGETATION PATTERNS IN DEPRESSIONAL RESTORED, NATURAL REFERENCE, AND PRIOR-CONVERTED WETLANDS IN THE USA MID-ATLANTIC COASTAL PLAIN.
    (2012) Yepsen, Metthea; Baldwin, Andrew; Environmental Science and Technology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Vegetation responds quickly to environmental changes, making it a useful tool for assessing the success of wetland restorations. Plant community composition was compared in 47 sites across the coastal plain of Maryland, Delaware, Virginia, and North Carolina, USA. Fifteen of the sites were isolated depressional wetlands (natural reference), 16 were farmed "prior-converted cropland" sites (ditched and drained former wetlands), and 17 were restored wetlands. Prior-converted sites were highly disturbed and dominated by non-wetland conventional row crops. Natural reference sites were dominated by native woody species and restored sites were dominated by herbaceous wetland species. Natural reference sites had lower Anthropogenic Activity Index scores, higher average coefficients of conservatism, and higher Floristic Quality Assessment Index scores than restored and prior-converted sites. Wetland restorations have succeeded in developing wetland plant communities, but have not developed plant communities that match natural reference wetlands. This is likely due to continued human disturbance, age, and a lack of proper propagules.