title: Spatial-temporal variations of phosphorus fractions in surface water and suspended particles in the Daliao River Estuary, Northeast China.
abstract: The transport and storage of phosphorus in estuary is a complex biogeochemical process as the result of the convergence of fresh and saline water. The objective of the current study is to investigate the spatial-temporal variations of phosphorus fractions in surface water and suspended particles of Daliao River Estuary, China. Samples were collected in August (wet season) and November (dry season), 2013. The results showed that total particulate phosphorus (TPP) in water accounted for more than 50 % of the total phosphorus (TP). Meanwhile, in suspended particles, more than 62 % of particulate phosphorus was in the form of bioavailable phosphorus, including exchangeable phosphorus (Exc-P), extractable organic phosphorus (Exo-P), and iron-bound phosphorus (Fe-P), which meant that the potential impacts of bioavailable phosphorus in suspended particles on estuarine water environment cannot be ignored. There were significantly seasonal variations of phosphorus fractions in the Daliao River Estuary. The concentrations of phosphorus fractions in water in wet season were much lower than that in dry season because of the dilution effect of larger rainfall in wet season. In addition, spatial distribution characteristics of phosphorus fractions were also obvious. Due to terrigenous phosphorus input from the upstream of tidal reach and seawater dilution effect in coastal estuary, total dissolved phosphorus (TDP) concentrations in water gradually decreased from tidal reach to coastal estuary. However, the concentrations of TPP and TP in water and Exo-P in suspended particles presented spatial fluctuation, and these were greatly attributed to sediment re-suspension in coastal estuary.
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. qinyw@craes.org.cn.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. qinyw@craes.org.cn.
authors.forename: Yanwen
authors.initials: Y
authors.lastname: Qin
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|School of Environment, Tsinghua University, Beijing, 100091, China.
authors.forename: Chaonan
authors.initials: C
authors.lastname: Han
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cao
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Yingqun
authors.initials: Y
authors.lastname: Ma
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Shi
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Liu
authors.affiliation: National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.|State Environmental Protection Key Laboratory of Estuarine and Coastal Environment, Water Research Institute, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Chenchen
authors.initials: C
authors.lastname: Yang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D063366:Estuaries; D019015:Geologic Sediments; D010758:Phosphorus / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Bioavailable phosphorus; Daliao River Estuary; Phosphorus fraction; Surface water; Suspended particles; Tide