The Rhododendron genus can be found in many different habitats around the world but scarce in desserts, and dry forests as well as tundra regions. . Rhododendrons are studied from the xylem to the leaves, but we believe the secret is in the roots. Kong et al., found two different dimensions of root trait diameter across 96 subtropical woody species: a diameter related dimension that may integrate root construction, and possibly maintenance and persistence, with a branching density dimension that may express difference in root plastic responses to environment. We would like to address the question of what really goes on in the roots and if the anatomy and morphology of the roots are connected to the temperature tolerance of different rhododendron species. We also believe that Rhododendron with similar cold tolerances have similar fungi on their roots. The study site was the Helen S. Layer Rhododendron garden at Holden Arboretum. We studied the morphology, anatomy of six species of Rhododendron from three sections: Ponticum section (Maximum, Degronianum), Pentanthera section (Austrinum, Molle), and Tsutsuti (Yedoense, Indicum).
NUTRIENT CONCENTRATIONS AS INDICATORS OF WETLAND CONDITION: EVALUATING THE OHIO RAPID ASSESSMENT METHOD03/15/2016
Wetlands are habitats between terrestrial and aquatic ecosystems. As “middle” positions, wetlands rely on inputs from surrounding landscapes. Wetlands act as buffers, filtering polluting nutrients from inflowing waters and preventing eutrophication downstream. Wetlands have historically been drained and removing these buffers threatens water quality.
The Ohio Rapid Assessment Method (ORAM) is a metric used to categorize wetlands in Ohio between three scores. A high score of three indicates the highest quality wetland and one indicates lowest quality. This method is based on structural aspects of wetlands including size, plant community, depth, surrounding land use, and hydrological alterations and development. We aimed to determine if ORAM scores relate to ecosystem function, as indicated by nutrient concentrations and sediment phosphorus sorption characteristics. We predicted nutrient concentrations are higher in wetlands with lower ORAM scores and phosphate sorption capacity will be higher in wetlands with higher scores.
Nine palustrine scrub-shrub wetlands owned by Kent State University were identified via National Wetland Inventory (NWI) and Web Soil Survey from the U.S. Department of Natural Resources, and assigned an ORAM score. In each wetland, we sampled surface waters for water quality analyses and sediments (10cm) phosphate sorption analyses.
Wetlands near roads had higher concentrations of Cl- than those with wider buffers of forest. Inidcators of phosphate sorption capacity varied within wetlands, but were unrelated to wetland ORAM scores. Our data suggest that wetland ORAM scores do not necessarily reflect wetland nutrient cycling function.