title: [Influence of submerged macrophytes on phosphorus transference between sediment and overlying water in the growth period].
abstract: In order to study the process of phosphorus transfer between sediment and overlying water, Hydrilla verticillata and Vallisneria natans were cultured in spring, Potamogeton crispus was cultured in winter. Changes of environmental factors and phosphorus concentrations in water and sediment were investigated. The results indicated that: submerged macrophytes could reduce all phosphorus fractions in the overlying water. Phosphorus concentrations in overlying water maintained in a relative low level in the growth period of submerged macrophytes. The concentrations of total phosphorus (TP) in overlying water of H. verticillata, V. natans and P. crispus were 0.03-0.05, 0.04-0.12, 0.02-0.11 mg x L(-1), respectively. All phosphorus fractions in sediment were reduced. The maximum value between submerged macrophyte and control of H. verticillata, V. natans and P. crispus were 35.34, 60.67 and 25.92 mg x kg(-1), respectively. Dissolved oxygen (DO), redox potential (Eh) and pH in overlying water increased (DO 10.0-14.0 mg x L(-1), Eh 185-240 mV, pH 8.0-11.0) in the submerged macrophytes groups. Submerged macrophytes increased Eh( -140 - -23 mV) and maintained pH(7.2-8.0) in neutral range. The results indicated that submerged macrophytes affected phosphorus transferring between sediment and overlying water through increasing DO, Eh and pH in overlying water, and Eh in sediment.
authors.affiliation: Jiangsu Key Laboratory of Environmental Change and Ecological Construction, College of Geographical Science, Nanjing Normal University, Nanjing 210046, China. wlzlyj@163.com
authors.forename: Li-Zhi
authors.initials: LZ
authors.lastname: Wang
authors.forename: Guo-Xiang
authors.initials: GX
authors.lastname: Wang
authors.forename: Zhen-Fei
authors.initials: ZF
authors.lastname: Yu
authors.forename: Bei-Bei
authors.initials: BB
authors.lastname: Zhou
authors.forename: Qiu-Min
authors.initials: QM
authors.lastname: Chen
authors.forename: Zhen-Guo
authors.initials: ZG
authors.lastname: Li
mesh_terms: D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis / Q000737:chemistry*; D031321:Hydrocharitaceae / Q000254:growth & development / Q000378:metabolism*; D060106:Lakes / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism*; D031821:Potamogetonaceae / Q000254:growth & development / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus