沉水植物伊乐藻光合放氧对水体氮转化的影响  

Effect of photosynthesis oxygen evolution of submerged macrophyte Elodea nuttallii on nitrogen transformation in water

作　　者：赵安娜[1,2] 冯慕华[1] 李文朝[1] 潘继征[1] 柯凡[1,2] 

机构地区：[1]中国科学院南京地理与湖泊研究所,江苏南京210008 [2]中国科学院研究生院,北京100049

出　　处：《生态环境学报》2010年第4期757-761,共5页Ecology and Environmental Sciences

基　　金：国家高技术研究发展计划(863)项目(2006AA06Z325);国家重点基础研究发展规划(973)项目(2008CB418005);国家水专项资助项目(2008ZX07101-007-05)

摘　　要：实验室内利用聚乙烯容器于光照培养箱内开展开放和封闭实验,研究沉水植物伊乐藻(Elodea nuttallii)光合放氧对水体氮转化的影响及其对水体氮的净化效果和机理。结果表明,伊乐藻光合放氧使水体DO和pH值升高,促进了开放系统氨氮的挥发,同时水体较低的氨氮含量及较高的pH值抑制了氨氮向硝氮的转化。封闭系统通过阻止氨氮的挥发降低了总氮的去除作用,但并不影响氨氮向硝氮的转化。另外,高的DO和pH环境不利于反硝化细菌的存活,使反硝化作用比较微弱或不存在。Open and close experiments were carried out in light incubator to study the effect of photosynthesis oxygen evolution of submerged macrophyte Elodea nuttallii on nitrogen transformation in water,and its consequent influence on nitrogen purification effect and mechanism by using polyethylene vessel.The results showed that,the photosynthesis oxygen evolution of Elodea nuttallii caused high water DO and pH,which accelerated ammonia volatilization in open system,meanwhile,low ammonia nitrogen content and high pH inhibited the transformation of ammonia to nitrate.In addition,high DO and pH didn’t favor the survival of denitrification bacteria,which made denitrification weak or inexistent.

关 键 词：沉水植物 伊乐藻 光合放氧 氮转化 净化效果 净化机制 

分 类 号：X173[环境科学与工程—环境科学]