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Effects of Shading from Bridges on Estuarine Wetlands.
| 题名： | Effects of Shading from Bridges on Estuarine Wetlands. |
| 作者： | broome, s. w. craft, c. b. struck, s. d. sanclements, m. |
| 关键词： | coastal areas, nutrients, hydrology, habitat, aquatic ecosystems, marshes, environmental impacts, invertebrates, biological communities, plants, soils, species diversity |
| 摘要： | Salt and brackish water marshes are integral parts of the coastal ecosystem, performing important nutrient cycling and hydrologic functions as well as providing habitat and breeding grounds for many coastal species. As human populations in coastal area increase so does the need for an improved and more extensive infrastructure including bridging across estuaries and marshes when building roads. Very little research has been conducted to quantify the effects of shading on marsh function and productivity, and to determine the amount of mitigation that should be required to offset these effects. The objectives of this research were to determine the effects of bridge height and width on marsh productivity and function by directly assessing light attenuation under bridges, determining the effects of shading on the dominant salt marsh species and comparing benthic invertebrate communities beneath seven highway bridges with marshes outside of bridge-affected areas (reference marshes). Photo synthetically available light was measured. Plant samples were clipped, dried and weighed to determine aboveground biomass, average stem height, number of stems, number of flowers and basal area. Soil cores were taken to a depth of 30cm to determine soil C and N and below-ground biomass. / NOTE: Final rept. (July 2000 - June 2003). / Supplementary Notes: Sponsored by Department of Transportation, Washington, DC. Research and Special Programs Administration. and Federal Highway Administration, Raleigh, NC. North Carolina Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0717；66p |
| 报告类型： | 科技报告 |
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