%0 Journal Article
%T Environmental Biogeochemical Significance of Nitrogen in Jiaozhou Bay Sediments<br>胶州湾沉积物氮的环境生物地球化学意义
%A DAI Ji-cui
%A SONG Jin-ming
%A ZHENG Guo-xia
%A LI Xue-gang
%A YUAN Hua-mao
%A LI Ning
%A <br>戴纪翠
%A 宋金明
%A 郑国侠
%A 李学刚
%A 袁华茂
%A 李宁
%J 环境科学
%D 2007
%I 
%X The geochemical characteristics of nitrogen forms in different grain size sediments of Jiaozhou Bay were investigated employing the sequential extraction technique. Results showed that the transferable nitrogen in Jiaozhou Bay sediments can be divided into four forms: ion exchangeable form (IEF-N), weak acid extractable form (WAEF-N), strong alkaline extractable form (SAEF-N) and strong oxidant extractable form (SOEF-N). The percentages of nitrogen forms for transferable nitrogen in different grain size sediments were different. Generally, for all grain size sediments, the SOEF-N was the primary form accounted for 35.38%, 44.38% and 58.69% of transferable nitrogen for fine, medium and coarse sediments. And for medium and coarse grain size sediment, SAEF-N was the dominant inorganic nitrogen accounted for 26.31% and 25.85%, respectively. And for fine-grained sediments, IEF-N was the primary inorganic nitrogen accounted for 27.67% of transferable nitrogen. The correlation analysis showed that generally, nitrogen was positive correlated with fine and medium grain size but negative correlation with coarse sediments. In addition, nitrogen in different grain size sediments had also positive correlations with phytoplankton abundance, chlorophyll-a and NO3- concentrations of overlying water. The results showed that sediments have great influences on element concentrations of overlying water, and on the other side, it also illustrated that sedimentary nitrogen is an excellent indicator of hypereutrophication and has essential environmental significance.
%K Jiaozhou Bay sediments
%K nitrogen
%K geochemical characteristic
%K grain size
%K environmental biogeochemistry<br>胶州湾沉积物
%K 氮
%K 地球化学特征
%K 粒度
%K 环境生物地球化学
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=956E1D71FBEF8F4F&yid=A732AF04DDA03BB3&vid=D3E34374A0D77D7F&iid=9CF7A0430CBB2DFD&sid=FEE377A727789A99&eid=A2D60850BF3030B0&journal_id=0250-3301&journal_name=环境科学&referenced_num=2&reference_num=17