水体沉积物中磷分级及其影响因素--以Hupfer方法为例

Phosphorus fraction in sediment and its influence factors based on the Hupfer method

根据Hupfer方法可将沉积物中磷形态划分为弱吸附态磷(NH_4Cl-P)、铁磷(Fe-P,BD-P)、铝磷(Al-P,NaOH-P)、钙磷(Ca-P,HCl-P)和残渣态磷.本文通过数据提取和分析,发现全磷(TP)与以上各部分磷之间存在极显著的相关性(P<0.001),其中,TP与NH_4Cl-P、BD-P和HCl-P之间的关系符合一元二次方程,与其他组分的关系符合线性关系.进一步分析表明:沉积物自身磷质量分数、外源磷负荷、悬浮条件和氧化还原电位是影响磷形态分级和生物有效性的主要因素,并就湖泊中磷的形态分级和转化进行了探讨,为今后评价磷的内源循环提供理论参考.

In the Hupfer method,the P fraction is classified as NH4CI-P（loosely adsorbed P）,BD-P（Fe-P）, NaOH-P（Al-P）,HCl-P（Ca-P） and residual-P.We extensively extracted the P fraction data from previous published papers and analyzed all the data together.The results show that total phosphorus（TP） was significantly correlated with NH_4Cl-P,BD-P,NaOH-P,HCl-P and residual-P（P 0.001）.Quadratic relationships were found between TP and NH_4CI-P,BD-P and HCl-P.There were significant linear relationships between TP and NaOHP and residual-P.Furthermore,the native P content of sediments,external sources of P loading,resuspension of sediment particles and redox potentials were demonstrated as major factors influencing P distribution.This study provides a novel insight into the mutual correlation of each P composition and will help identify the hotspots of P release region by using fractionation and TP under favorable conditions.