Phosphorus Fractions Transformation in Sediments Before and After Cyanobacterial Bloom: Implications for Reduction of Eutrophication Symptoms in Dam Reservoir
Source: Water, Air, and Soil Pollution, Volume 211, Numbers 1-4, September 2010 , pp. 287-298(12)
Abstract:In order to observe the spatial phosphorus (P) fractions transformations in sediments in relation to bacterial abundance and enzyme hydrolysing organic P-alkaline phosphatase (APA), samples from 35 stations from eutrophic Sulejow Reservoir were taken in spring after flood and in summer after cyanobacterial bloom breakdown. The results show pronounced fluctuations: decrease of average total P in sediments, despite organic matter delivery after cyanobacterial bloom, in parallel with increase of labile P (8.3%) and Ca-bounded P (16.6%) fractions and decline of organic P fraction (28.5%). Higher alkaline activity in sediments in the spring delivered nutrients to water column and supported cyanobacterial bloom development during the summer. Positive correlation between APA and organic P (r = 0.37, p < 0.01, n = 70) and negative with labile inorganic P (r = −0.44, p < 0.01, n = 70) in sediments proved significant role of the APA in phosphorus transformation in sediments and internal loading in the reservoir. During summer, APA was significantly related to bacterial number (r = 0.36, p < 0.01, n = 35) and bacterial abundance was correlated to organic matter content (r = 0.36, p < 0.01, n = 35). Such pattern of temporal variations of P transformation in sediments indicates order of solutions for enhancement of recultivation effects of eutrophic dam reservoirs: (1) reduction of organic matter supply in spring and (2) sediment inactivation during summer.
Document Type: Research article
Affiliations: 1: Laboratory of Isotope Geology and Geoecology, Department of Applied Geology and Geochemistry, Institute of Geological Sciences, University of Wroclaw, 30 Cybulskiego Str., 50-205, Wrocław, Poland, Email: firstname.lastname@example.org 2: European Regional Centre for Ecohydrology, Polish Academy of Sciences, 3, Tylna Str., 90-364, Łódź, Poland
Publication date: 2010-09-01