Vertical Distribution of Phosphorus Forms in Sediments of Lake Qingling and Phosphorus Release Risk Assessment
LI Hui
CAI Yingying
ZHANG Shunxi
QUAN Fengjiao
LI Jianfen
Abstract：This paper intends to reveal the phosphorus release potential energy of different phosphorus spices at varied depths of sediments in eutrophic lakes and the relevant environment risk.Lake Qingling in Wuhan City is taken as the ob-ject of case study which includes the vertical distribution characteristics of organic matter,microbial extracellular enzymes,phosphorus forms,phosphorus adsorption behavior and phosphorus adsorption index of sediments.As a result,the case study shows that iron bound phosphorus(Fe(OOH)～P)and calcium-bound phosphorus(CaCO3～P)are the main phosphorus forms in the sediments of Lake Qingling,and both Fe(OOH)～P,CaCO3～P and the hot alkali extractable organo-phosphus of the sediments possess phosphorus release potentials;besides,microorganisms and their extracellular enzymes play an im-portant role in phosphorus release.Furthermore,as for the intensity of phosphorus release risk of the sediments in different depths:surface sediments show stronger,while deep sediments(10～15 cm and deeper)that are of good buffer capacity show less risk;and at two sampling sites in south part of the Lake,the phosphorus release risk index(ERI)of surface sediment are 20.66%and 26.57%,respectively,and at three sampling sites in north part of the Lake are 35.61%,111.22%and 325.96%,respectively.
Keywords：Lake Qinglingsedimentsphosphorus sorption indexequilibrium phosphorus concentrationphosphorus release risk
Publication Date：2023-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 153-160 )