期刊詳細資料 Journal detailed information
作者(Author)Wang, Chih-Yu、Sample, David J.、Bell, Cameron
篇名(Article title)Vegetation effects on floating treatment wetland nutrient removal and harvesting strategies in urban stormwater ponds
期刊名(Journal name)Science of The Total Environment
國際期刊(International Journal)SCI
中文摘要(Abstrct) 
ABSTRCTFloating treatment wetlands (FTWs) consist of emergent macrophytes that are placed on a floating mat in a pond for water treatment and aesthetic purposes. FTWs may have unique advantages with respect to treating urban runoff within existing retention ponds for excess nutrients. However, research is lacking in providing guidance on performance of specific species for treating urban runoff, and on timing of harvest. Harvesting is needed to remove nutrients permanently from the retention pond. We investigated vegetation effects on FTWs on nitrogen (N) and phosphorus (P) removal performance and storage in above-ground FTW macrophyte tissues. The study evaluated pickerelweed (PW, Pontederia cordata L.) and softstem bulrush (SB, Schoenoplectus tabernaemontani) over time in microcosms flushed with water obtained from a nearby urban retention pond in northern Virginia near Washington, DC. While the literature exhibits a wide range of experimental sizes, using the term mesocosm, we have chosen the term microcosm to reflect the small size of our vessel; and do not include effects of sediment. The experiment demonstrated PW outperformed SB for P and N removal. Based upon analysis of the accumulated nutrient removal over time, a harvest of the whole PW and SB plants in September or October is recommended. However, when harvesting only the aerial parts, we recommend harvesting above-ground PW tissues in July or August to maximize nutrient removal. This is because PW translocates most of its nutrients to below-ground storage organs in the fall, resulting in less nutrient mass in the above-ground tissue compared to the case in the summer (vegetative stage). Further research is suggested to investigate whether vegetation can be overly damaged from multiple harvests on an annual basis in temperate regions.
中文關鍵字(Keyword)
KEYWORDNutrient removal Management strategy Urban retention pond Harvest Microcosm Floating wetlands
卷期(Volume No)Vol.499 No.
頁數(Page number)PP.384~393
年份(Year)2014/11
語言(Language)2