title: Characteristics of various forms of phosphorus and their relationships in the sediments of Haizi Lake, China.
abstract: The phosphorus (P) distribution in the sediments of Haizi Lake from the middle reach of the Yangtze River region, China, was investigated using a sequential chemical extraction procedure. P forms and concentrations of sediment samples taken at 25 sites over the whole lake were measured. The relationships between various forms of P in sediments and dissolved P in the overlying water were also discussed. Results showed that the concentrations of total P (TP) in the sediments ranged from 404 to 670 mg kg⁻¹, with an average of 503 mg kg⁻¹. The exchangeable P (Ex-P), Al-bound P (Al-P), Fe-bound P (Fe-P), occluded P (Oc-P), authigenic carbonate fluorapatite + biogenic apatite + CaCO₃-associated P (ACa-P), detrital apatite + other inorganic P (De-P) and organic P (Or-P) accounted for, on average, 0.52, 0.04, 10.9, 32.0, 7.4, 20.1 and 29.0% of TP, respectively. Relevance analysis indicated that Oc-P, ACa-P and De-P, as the majority forms of inorganic P, were less correlated to others. The significant correlations between Ex-P, Al-P, Fe-P, Or-P and TP suggested the probability of reciprocal transformation. It was suggested that Ex-P, Al-P, Fe-P, Or-P and TP in the sediments might be released easily to the water interface, resulting in sustained lake eutrophication.
authors.affiliation: Environmental Research Institute of Shanghai Institute of Technology, China.
authors.forename: Dongsu
authors.initials: D
authors.lastname: Bi
authors.forename: Xiaopin
authors.initials: X
authors.lastname: Guo
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Cai
authors.forename: Xiufang
authors.initials: X
authors.lastname: Gao
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Jinlong
authors.initials: J
authors.lastname: Guo
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Long
authors.forename: Zhiqian
authors.initials: Z
authors.lastname: Zhong
authors.forename: Yurun
authors.initials: Y
authors.lastname: Liang
mesh_terms: D002681:China; D005843:Geography; D019015:Geologic Sediments / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus