摘要
Phosphorous （P） fraction characteristics in sediment resuspension were investigated under adequately hydrodynamic conditions. Four forms of P in overlying water, including dissolved inorganic P, dissolved total P, total P, and particulate P, and six fractions of P in suspended particulate matter （SPM）, including loosely sorbed P （NH4Cl-P）, redox-sensitive P （BD-P）, aluminum-bound P （Al- P）, organic P （NaOH-nrP）, calcium-bound P （Ca-P） and residual P （Res-P）, were quantified, respectively. Different hydrodynamic conditions resulted in different P form changes. Four states could be ascribed： （1） P desorption by sediment and SPM, and P adsorption by overlying water; （2） P desorption by SPM, and P adsorption by overlying water; （3） P adsorption by SPM, and P desorption by overlying water; and （4） P equilibrium between SPM and overlying water. The contents of P in overlying water acquired peak values in the middle position of the vertical P distribution due to the combined actions of SPM and sediment. P fractions in SPM were in the following order： BD-P 〉 NaOH-nrp 〉 Ca-P 〉 Al-P 〉 Res-P 〉 NH4Cl-P. BD-P in SPM frequently exchanged with P forms in overlying water. Resuspension was favorable to forming Ca-P in SPM.
Phosphorous （P） fraction characteristics in sediment resuspension were investigated under adequately hydrodynamic conditions. Four forms of P in overlying water, including dissolved inorganic P, dissolved total P, total P, and particulate P, and six fractions of P in suspended particulate matter （SPM）, including loosely sorbed P （NH4Cl-P）, redox-sensitive P （BD-P）, aluminum-bound P （Al- P）, organic P （NaOH-nrP）, calcium-bound P （Ca-P） and residual P （Res-P）, were quantified, respectively. Different hydrodynamic conditions resulted in different P form changes. Four states could be ascribed： （1） P desorption by sediment and SPM, and P adsorption by overlying water; （2） P desorption by SPM, and P adsorption by overlying water; （3） P adsorption by SPM, and P desorption by overlying water; and （4） P equilibrium between SPM and overlying water. The contents of P in overlying water acquired peak values in the middle position of the vertical P distribution due to the combined actions of SPM and sediment. P fractions in SPM were in the following order： BD-P 〉 NaOH-nrp 〉 Ca-P 〉 Al-P 〉 Res-P 〉 NH4Cl-P. BD-P in SPM frequently exchanged with P forms in overlying water. Resuspension was favorable to forming Ca-P in SPM.
基金
supported by the National Basic Research Program(973) of China(No.2008CB418203)
