大量研究表明，当外源磷得到有效控制后，底泥内源磷释放的控制是富营养化湖泊治理的关键。国际上，底泥原位钝化控磷技术已广泛应用于湖泊内源磷的控制，且成为主流。该技术是利用锁磷剂将底泥磷组分的活性态转化为惰性态（矿物态磷）的原理来控制底泥内源磷的释放。然而，对于锁磷剂促生的矿物态磷种类以及其活化特征一直缺乏相关的研究，阻碍了人们对于原位钝化控磷机理的认识。鉴于此，本项目以自主研发的钙型、铝型和国际上主流应用的镧型锁磷剂为对象，通过室内培养和现场调查，借助磷同步辐射、磷固相核磁共振以及磷氧同位素示踪等技术手段，研究不同类型锁磷剂对底泥磷锁定的分子机制，识别新生矿物态磷的种类；研究微生物、典型湖区环境因素及其组合对新生矿物态磷稳定性的影响；结合室内和现场调查分析结果，解析不同类型锁磷剂促生底泥矿物态磷种类及其活化潜力，并阐明其锁磷机制，研究结果对我国湖泊底泥内源磷治理具有重要指导作用。

Many studies indicated that sediment internal P control is very important for eutrophication restoration when the external P loading is effectively reduced. At present, in situ sediment P inactivation is increasingly used for sediment internal P management in the world and have became the main technology. The method of inactivation agents were to transfer sediment reactive P to metal phosphate mineral (inert P) , therefore, to control sediment phosphorus release. In this study, two self developed P inactivation agents (Al- and Ca- forms) and the widely used La form inactivation agent were used. Laboratory and field experiments were carried out to investigate the molecular P binding mechanism of the selected agents using several technologies such as phosphorus synchrotron radiation, solid state nuclear magnetic resonance, oxygen phosphate isotope and at the same to identify the species of phosphate mineral. To investigate the influence of microorganism and typical environment factors (single and combined) of lake region on the activation of these formed phosphate minerals. At last, the driving mechanism of activation of these phosphate minerals were elucidated using laboratory and long-term field experiments. The results of this study is very important to the management of sediment internal phosphorus in our country.