title: Variations of different dissolved and particulate phosphorus classes during an algae bloom in a eutrophic lake by31P NMR spectroscopy.
abstract: Characterization of phosphorus (P) pools is vital to understanding the contribution of P to water eutrophication. In this study, dissolved and particulate P classes during an algae bloom in Lake Taihu, as well as their relationships with the main environmental factors, were analyzed based on solution31P NMR. The results showed that dissolved P was dominated by orthophosphate (Ortho-P) in heavily polluted regions and by orthophosphate monoester (Mono-P) and orthophosphate diester (Diester-P) in lightly polluted regions, indicating that the main dissolved P classes varied with the degree of lake pollution. The difference in the temporal variation patterns of dissolved P classes revealed that dissolved Ortho-P is the preferred class, and its concentration may be affected by major primary producers. It also revealed that dissolved Mono-P is prone to accumulation under the effects of algal blooms, especially in heavily polluted regions. The main particulate P classes were similar to those of dissolved P, but their variation trends were the same in different lake regions. There were significant positive correlations between the major particulate P classes and Chl a during the majority of the sampling period, indicating that living algal cells have a major contribution to particulate P. Obvious temporal variations of P classes may affect the bioavailability and dynamics of P in the water of Lake Taihu, but the particle reactivities of the main inorganic and organic P classes were similar. Therefore, they have little effect on P partitioning between the dissolved and particulate phases.
authors.affiliation: Institute of Natural Resources and Environment, Henan University, Kaifeng 475004, China; College of Environment and Planning, Henan University, Kaifeng 475004, China.
authors.forename: Xiuling
authors.initials: X
authors.lastname: Bai
authors.affiliation: College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Sun
authors.affiliation: Institute of Natural Resources and Environment, Henan University, Kaifeng 475004, China; College of Environment and Planning, Henan University, Kaifeng 475004, China. Electronic address: ykzhou2009@126.com.
authors.forename: Yunkai
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: College of Environment and Planning, Henan University, Kaifeng 475004, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Gu
authors.affiliation: College of Environment and Planning, Henan University, Kaifeng 475004, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Zhao
authors.affiliation: College of Environment and Planning, Henan University, Kaifeng 475004, China.
authors.forename: Jiehua
authors.initials: J
authors.lastname: Wang
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D060106:Lakes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D010839:Phytoplankton / Q000187:drug effects / Q000254:growth & development; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: (31)P NMR; Lake Taihu; Phosphorus; Temporal variation