title: [Study on phosphorus adsorption characteristic of sediments in an ecological ditch].
abstract: Sediments properties and phosphorus (P) adsorption capacities were compared among the samples of 0-5 cm and 5-15 cm layers from the ecological ditch vegetated with Cenetlla asiatica, Sparganium stoloniferum and a natural agricultural ditch with weeds. The results showed the 0-5 cm sediment vegetated with Cenetlla asiatica had higher concentrations of oxalate extracted Fe, Al and P than those vegetated with Sparganium stoloniferum or weeds. The parameters calculated from the Freudlich and Langmiur isotherms showed the equilibrium phosphate concentration (EPC0) ranged from 0.009 to 0.031 mg x L(-1). Cenetlla asiatica in the 0-5 cm layer had the maximum values of 352.2 L x kg(-1) and 562.7 mg x kg(-1) for Freundlich adsorption constant (K(f)) and Langmuir sorption maximum (S(max)), respectively, which proved it had the highest P adsorption capacity. The regression analysis showed P sorption parameters had significant relationship to oxalate-extracted Fe, clay content and DPS (P < 0.05). It was thus clear that aquatic plants influenced sediment properties and P adsorption capacity, and the practice of growing proper plants in ecological ditch could reduce the risk of P loss in non-point source pollution.
authors.affiliation: Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China. zhang-shu-nan@163.com
authors.forename: Shu-Nan
authors.initials: SN
authors.lastname: Zhang
authors.forename: Zhao-Yue
authors.initials: ZY
authors.lastname: Jia
authors.forename: Run-Lin
authors.initials: RL
authors.lastname: Xiao
authors.forename: Feng-Fei
authors.initials: FF
authors.lastname: Yang
authors.forename: Hong-Bing
authors.initials: HB
authors.lastname: Yu
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Jin-Shui
authors.initials: JS
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D002681:China; D017753:Ecosystem; D019015:Geologic Sediments / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis / Q000302:isolation & purification*; D063245:Plant Development; D010944:Plants / Q000378:metabolism*; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen