%0 Journal Article
%T The study on uptake of nitrate and ammonium by Scendesmus obliquus based on 15N stable isotope technique<br>基于15N稳定同位素技术的斜生栅藻对硝氮和氨氮吸收的研究
%A Bao Yuanyu
%A ZHONG Ping
%A WEI Gui feng
%A GUO Hai sen
%A LIU Zheng-wen
%A <br>包苑榆
%A 钟萍
%A 韦桂峰
%A 郭海森
%A 刘正文
%J 水生态学杂志
%D 2011
%I 
%X Abstract: Nitrate (NO3 -N) and ammonium (NH4+-N) nitrogen are the main forms of inorganic nitrogen in waters. This paper studied the uptake characteristics of NO3 -N and NH4+-N by Scendesmus obliquus based on 15N stable isotope technique. The result shows that the NH4+-N uptake rate was significantly higher than NO3 -N uptake rate at the same nitrogen concentration; The NO3 -N uptake rate in the mixed nitrogen group in which both NO3 -N and NH4+-N presented was significantly lower than that in the single nitrogen group in which only NO3 -N presented, indicating that the presence of NH4+-N inhibits the uptake of NO3--N. The result also shows that when 15NO3--N and 14NO3--N existed simultaneously, Scendesmus obliquus took up 14NO3--N preferentially which produces isotope fractionation. However, the effect of different form of nitrogen source is far greater than the effect of isotope fractionation.
%K 15N stable isotope
%K Scendesmus obliquus
%K Nitrate
%K Ammonium<br>15N稳定同位素
%K 斜生栅藻
%K 硝氮
%K 氨氮
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=A129AB11A5573C59&jid=AD42C12863085B5F664F8056EF6D57C2&aid=BAD6DB028A3BCAC8B4B9711ADD1AA0B0&yid=9377ED8094509821&vid=9971A5E270697F23&iid=38B194292C032A66&sid=7801E6FC5AE9020C&eid=A04140E723CB732E&journal_id=1674-3075&journal_name=水生态学杂志&referenced_num=0&reference_num=0