摘要
采集官厅水库的永定河入库口附近沉积物,采集深度77 cm,以1 cm做为一个层位单元进行分割,测定其中11个层位的总磷,同时对这些层位沉积物中二钙结合态磷、八钙结合态磷、铝结合态磷、铁结合态磷进行连续分级提取,有机磷通过灼烧法测定,残留态磷由总磷与上述五种形态磷差减确定.结果显示:沉积物中总磷含量在580.3～1276.2 μg/g,主要成分为无机磷,平均占总磷的比例为88%;残留态磷为沉积物中磷的主要形态,含量占总磷50%以上.在沉积物深度75～20 cm的沉积年份中,永定河向官厅水库输送的残留态磷量不断增加,且增速逐渐加快,主要为水土侵蚀的产物.从沉积深度20 cm以来的沉积年份里,总磷的输入量不断减少,但以二钙结合态磷为主的生物有效磷输入量随总磷的含量降低而持续增加,主要来自工业和生活污水,反映了官厅水库上游永定河流域内工业和生活污水排放所占的比重日益增加,成为官厅水库富营养化污染的主要来源,以致官厅水库富营养化的趋势增强.
Sediments were sampled near the Yongding River estuary. The sampling depth was 77 cm and was separated into 77 layers. 11 layers of samples were chosen to determine total phosphorus （TP） and the sequentially extracted Ca2-P, Ca8-P, A1-P, Fe-P. Org-P was determined by ignition method. Res-P was the difference value of TP and the sum of Ca2-P, Ca8-P, A1-P, Fe-P and Org-P. The result shows that TP contents in the sediments range from 0.06% to 0.12%. Inorganic phosphorus （IP） is a major component, of which the average ratio to TP is 88%. The major speciation is residual phosphorus （Res-P）. TP imported into Guanting Reservoir from Yongding River in early period increased, which was partly derived from soil-erosion, and the increasing rate became bigger gradually, then decreased during the deposition period of the upper 20 centimeter depth of the sediments. On the other hand, bioavailable phosphorus （BAP） which mostly consist of Ca2-P and mainly from wastewater discharged from industry and municipal sewage keeps continuously rising. Our results have revealed that P sources of Guanting Reservior in Yongding River valley have changed continually. The proportion of P discharged from industry and municipal sewage have been increasing along with time, becoming the major component of Guanting Reservior P sources which may lead to more intensified eutrophication of Guanting Reservior.
出处
《岩矿测试》
CAS
CSCD
2005年第3期176-180,共5页
Rock and Mineral Analysis
基金
国家重点基础研究发展规划项目(G1999045709)
关键词
永定河
沉积物
磷
官厅水库
Yongding River
sediments
phosphorus
Guanting Reservior
