title: Variations of alkaline phosphatase activity and P fractions in sediments of a shallow Chinese eutrophic lake (Lake Taihu).
abstract: The distribution of alkaline phosphatase activity (APA) and P fractions in sediment cores and the relationship between them were studied in a shallow Chinese freshwater lake (Lake Taihu). Sediment cores were collected from four sites, characterized by different degrees of eutrophication in June 2004. Sediment P was fractionated into Fe/Al-P, Ca-P, organic P (OP), inorganic P (IP) and total P (TP). The former two species made the largest contribution to the sediment P pool. Results show that trophic status and hydrological conditions have great impact on the APA of the sediments. The order of the APA in sediments was conjectured to be: macrophyte dominated lake>transitional lake>algal dominated lake. APA profiles follow a similar downcore decreasing trend. There was a positive relationship between the APA and the TP, IP. The multiple linear regression equation of the APA and P fractions is: APA=-97+0.768TP-0.985Fe/Al-P.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Nanjing University, Nanjing 210093, PR China.
authors.forename: Tingxi
authors.initials: T
authors.lastname: Zhang
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Wang
authors.forename: Xiangcan
authors.initials: X
authors.lastname: Jin
mesh_terms: D000469:Alkaline Phosphatase / Q000032:analysis*; D005591:Chemical Fractionation; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D056890:Eukaryota / Q000254:growth & development; D005068:Eutrophication; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D010758:Phosphorus / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D000469:Alkaline Phosphatase