主讲人简介：
Edward J. Carpenter教授是国际著名的海洋科学家，在海洋生物科学方面有很高造诣，曾兼职于多个国际学术机构，获得过多种奖励和荣誉，在Science、Nature、、Limnology and Oceanography以及其他国际权威学术杂志上共发表了190多篇论文，具有重要影响力。
个人主页：http://rtc.sfsu.edu/research/in_carpenter.html
讲座摘要：
Microbes in surface waters of most of the world’s oceans are limited by the availability of combined (fixed) nitrogen. In the past decade, N2 fixation by marine cyanobacteria has been shown to be as important to euphotic zone plankton as the flux of NO3 from deep water into surface waters. The organisms responsible for N2 fixation are discussed as well as the environmental factors that affect photosynthesis and N2 fixation. Rates of N2 fixation are compared in different oceans. The special conditions which promote N2 fixation in the Amazon River plume in the North Atlantic Ocean are illustrated. Recent estimates of N2 fixation and denitrification are compared in regard to the balance of the nitrogen cycle in the global ocean.
生活在海洋表层水体中的大多数微生物的生长均受固氮的限制。过去十年的研究表明，海洋蓝藻对真光层浮游生物的固氮作用与NO3从深海到表层海水的迁移同样重要。本讲座将探讨固氮生物类群、影响光合作用和固氮作用的相关环境因子、不同海域中的固氮速率，介绍亚马逊河入北大西洋冲淡水固氮的特殊条件、并对固氮及反硝化作用对全球海洋氮循环平衡的最新研究结果进行比较。
