瓦埠湖沉积物中氮与磷赋存形态分析  

Existing forms of phosphorus and nitrogen in sediments of Wabuhu Lake

作　　者：潘成荣[1] 李凌[1] 叶琳琳[2] 张之源[3] 

机构地区：[1]河海大学水生态环境模拟中心 [2]合肥工业大学资源与环境工程学院,安徽合肥230009 [3]安徽省环境保护局,安徽合肥230061

出　　处：《水资源保护》2007年第4期10-14,共5页Water Resources Protection

基　　金：安徽省自然科学基金(01045201);安徽省优秀青年基金(200137)

摘　　要：利用连续提取法研究了瓦埠湖沉积物中磷的赋存形态和氮的组成特征。结果显示:瓦埠湖沉积物中总磷含量为293～874 mg/kg,平均为470 mg/kg,总磷主要由无机磷组成;在沉积物的提取磷中铁结合态磷为主要赋存形态;铁磷、钙磷、铝磷的相对百分含量指示出该湖泊的磷源自污染较少的区域。瓦埠湖沉积物中总氮的含量为208～464 mg/kg,平均为265 mg/kg,氮的主要组成为有机氮,有机氮、有机指数等显示该湖泊属于清洁类型,未遭受污染。瓦埠湖流域的社会与自然状况的调查结果、湖泊底泥的有机碳氮比等均表明湖泊营养物质来自面源,各指标含量在空间分布的特点与相关性的差异,说明了物质沉积存在重力分离与水动力作用的过程。The existing forms of phosphorus and nitrogen in sediments of WaDuhu Lake were investigated by sequential extraction method. The concentrations of total phosphorus （TP） in sediment ranged from 293 to 874 mg/kg, with the average value of 470 mg/kg, composed mainly of inorganic phosphorus, and the Fe-bound P was the main existing form of inorganic phosphorus. The relative percentage of Fe-P, Ca-P, Al-P indicates that the phosphorus originated from less polluted region. The concentrations of total nitrogen （TN） in sediment ranged from 208 to 464 mg/kg, with the average value of 265 mg/kg, and TN was composed mainly of organic nitrogen. The organic nitrogen and organic index show that the Wabuhu Lake is healthy and has not been polluted. The social and natural condition of Wabuhu Basin and the mean TOC/TN ratio of the sediment showed that the nutrients come from non-point sources. The differences of spatial distribution of the indexes and correlation difference show that the function of gravitational separation and hydrodynamics is available in the sedimentation of nutrients.

关 键 词：瓦埠湖 沉积物 氮 磷 赋存形态 

分 类 号：X524[环境科学与工程—环境工程]