View article

In this study, the characteristics of organic phosphorus (P_o) fractions in sediments of six lakes from the middle and lower reaches of Yangtze River region and Southwestern China Plateau, China were investigated using a soil P_o fractionation scheme, and the relationships between P_o, inorganic phosphorus (P_i) and pollution status were also discussed. The results show that the rank order of P_o fractions was: residual P_o>HCl-P_o>fulvic acid-P>humic acid-P>NaHCO₃-P_o, with their average relative proportion 8.7:4.6:3.2:2.1:1.0. P_o fractions, especially nonlabile P_o, were significantly correlated with organic matter, P_o and NaOH-P_i. Different distribution patterns of P fractions were observed in those two different regions. P_o fractions in the heavily polluted sediments were higher than those in moderately and no polluted sediments, it is suggested that P_o should be paid more attention in the lake eutrophication …