Researching on nitrite-oxidizing bacteria communities from the Pearl River estuary to the South China Sea basin

氮元素的生物地球化学循环几乎完全依赖于海洋生态系统中丰富的微生物调节。硝化作用（包括氨氧化过程和亚硝酸盐氧化过程）就是一个由微生物所介导的氧化反应，分别由氨氧化细菌、古菌（ammonia-oxidizingbacteria，AOB；ammonia-oxidizingarchaea，AOA）和亚硝酸盐氧化细菌（nitrite-oxidizingbacteria，NOB）介导。长期以来氨氧化作用一直被视为硝化作用的限速步骤，因此，亚硝酸盐氧化过程一直被人们所忽略。直到最近，在对纳米比亚氧最小层、北太平洋热带东部地区上层水体与氧最小层研究时均发现亚硝酸盐氧化率可能比氨氧化率高，且2步氧化反应并没有必...The biogeochemical nitrogen cycle is almost totally dependent on regulation by abundant microorganisms in marine systems. Nitrification (ammonia oxidation and nitrite oxidation) is carried out by specific groups of prokaryotes: ammonia is firstly oxidized to nitrite by ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA), and subsequently to nitrate by nitrite-oxidizing bacteria (N...学位：理学硕士院系专业：海洋与地球学院_海洋生物学学号：2232012115132