岱海表层沉积物中影响氨氮释放的模拟研究

以北方半干旱地区典型内陆封闭湖泊岱海为研究对象，采用室内模拟实验方法，开展了温度、pH、溶解氧及水生植物对湖泊沉积物中NH4^＋—N释放的影响研究。结果表明，温度升高，中性条件，厌氧条件均有利于NF4^＋-N的释放。狐尾藻对上覆水NH4^＋-N含量的有效控制作用是其抑制底泥释放、同化吸收作用和增强上覆水氧化条件等综合作用的结果，植物修复是控制湖泊富营养化水平的有效措施。

The Simulation Research of Ammonium Nitrogen Release from the Surface Sediments of the Daihai Lake

The Daihai Lake is a typical inland lake in a semiarid region in Inner Mongolia, China. This research is mainly focus on the impact of temperature, pH values, dissolved oxygen, and hydrophyte （take Myriophyllnm spicatum L. for example ） on ammonium nitrogen release from the surface sediments of the Daihai Lake. The result indicated that higher temperature, neutral condition and anaerobic condition would improve the release of ammonium nitrogen, Furthermore, assimilation of Myriophyllum spicatum L. on the ammonium nitrogen could control ammoniacal nitrogen release from the surface sediments, and some of the ammonium nitrogen was oxidized to nitrate nitrogen by oxygen from photosynthesis of MyriophyUum spicatum L., which reduced the concentration of ammonium nitrogen in the overlying water. Therefore, phytoremediation could purify the water body and prevent the lake eutrophication.