摘要
以东平湖表层沉积物为研究对象,应用连续提取法测定了其中的总磷(TP)、弱吸附态磷(NH4Cl-P)、铝磷(Al-P)、铁磷(Fe-P)、钙磷(Ca-P)、残渣磷(Res-P)、有机磷(OP)等形态磷的含量,探讨了东平湖表层沉积物中磷的形态分布特征。研究结果表明:东平湖表层沉积物中总磷的平均含量为795.38mg/kg,与我国其他湖泊相比含量较高。表层沉积物中的磷主要以无机磷的形式存在,含量为384.9～1158.3mg/kg,约占沉积物中总磷的80.76%。各形态无机磷的含量在沉积物中的含量大小顺序为:Ca-P>Res-P>Al-P+Fe-P>NH4Cl-P,分别占无机磷的44.8%、31.2%、23.1%和0.9%。老湖码头和湖心岛附近沉积物中有机磷含量略高于其他区域,这与两处附近均有大片网箱养殖区和接纳较多生活污水有关。生物可利用磷在东平湖沉积物中的含量较高,平均为245.8mg/kg,占总磷的30.9%,沉积物中磷向上覆水释放的潜在风险较大。
Total phosphorus（TP）,weakly adsorbed phosphorus（NH4Cl-P）,Al-bound phosphorus（Al-P）,Fe-bound phosphorus（Fe-P）,Ca-bound phosphorus（Ca-P）,residual phosphorus（Res-P）and organic phosphorus（OP）in surficial sediment of Dongping Lake were measured by the sequential extraction process.And the distribution of phosphorus fractions were analyzed.The results showed that the average contents of TP were 795.38 mg/kg in the surficial sediments of Dongping Lake,which was a little higher than that of the other lakes in China.The phosphorus mainly distributed in inorganic fractions（IP）,ranging from 384.9 to 1 158.3 mg/kg,which accounted for 80.76% of TP in the surficial sediments of Dongping Lake.The decease order of different inorganic fractions was Ca-P〉Res-P〉Al-P＋Fe-P 〉Exp-P,accounting for 44.8%,31.2%,23.1% and 0.9% of IP,respectively.The OP is slightly higher in Laohu pier and mid-lake,which might be caused by the cage culture and the acceptance of more sewage.The average contents of bio-available phosphorus was 245.8 mg/kg,accounting for 30.9% of TP in the surficial sediments of Dongping Lake,which indicated that the surficial sediments might be a potential phosphorus source for the overlying water of Dongping Lake.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2010年第6期719-723,共5页
Resources and Environment in the Yangtze Basin
基金
国家"973"计划(2008CB418203-3)
中国博士后科学基金(20080431214)
关键词
东平湖
表层沉积物
磷
形态分布
Dongping Lake
surface sediments
phosphorus
phosphorus fractions
作者简介
田忠志（1953～），男，湖北省宣恩人，教授级高级工程师，主要从事水资源保护及管理等方面的研究．E-mail：zhongzhitian@yahoo.cn
