多花黑麦草对不同形态氮的吸收动力学特征研究  

Study on the uptake kinetics of ammonium and nitrate In Lolium multiflorum Lam.

作　　者：谢丽凤[1] 陆开宏[1] 胡智勇[1] 张克鑫[1] 刘夏松[1] 

机构地区：[1]宁波大学教育部应用海洋生物技术重点实验室

出　　处：《生态科学》2010年第3期229-233,共5页Ecological Science

基　　金：863国家高技术研究发展计划资助项目(2007AA10Z409)

摘　　要：采用改进常规耗竭法，比较研究了多花黑麦草（Lolium multiflorum Lam. ）对NH4^＋和NO3^－吸收动力学特征。结果表明多花黑麦草对NH4^＋和NO3^－吸收符合Miehaelis-Menten方程，它对NH4^＋的亲和力显著大于对NO3^－的亲和力，但对NH4^＋和NO3^－的最大吸收速率差异不显著，说明多花黑麦草偏爱吸收NH4^＋，在实际污水净化过程中，多花黑麦草具有优先吸收NH4^＋的趋势，若有足够的停留时间，其对NH4^＋净化程度会更高些；当吸收系统微生物受抑制时，多花黑麦草对NO3^－的吸收速率明显降低，亲和力明显提高，可见微生物对吸收体系中氮素的去除有一定促进作用。he ammonium and nitrate uptake kinetics of Lolium multiflorum Lam. were investigated using the modified depletion method. The kinetic characteristics of ammonium and nitrate uptake by L. multiflorum Lam. could be illustrated with the Michaelis-Menten equation. The maximum uptake rate （Vmax） and Michaelis–Menten constant （Km） were estimated by iterative curve fitting. The Km for NO3^-was significantly higher than that for NH4^＋in L. multiflorum Lam., which showed that L. multiflorum Lam. preferred NH4^＋. If hydraulic retention time is long enough, the purifying effect of ammonium by L. multiflorum Lam. will be better in wastewater treatment systems. When absorption system was treated with microbial inhibitors, the absorption rate and Km of NO3^-in L. multiflorum Lam. was significantly lower. It illuminated that microorganisms could promote the removal of nitrogen in the system.

关 键 词：多花黑麦草 铵态氮 硝态氮 吸收动力学 

分 类 号：X52[环境科学与工程—环境工程]