MAJOR ROLE OF THE CYANOBACTERIUM TRICHODESMIUM IN NUTRIENT CYCLING IN THE NORTH-ATLANTIC OCEAN
MAJOR ROLE OF THE CYANOBACTERIUM TRICHODESMIUM IN NUTRIENT CYCLING IN THE NORTH-ATLANTIC OCEAN
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DOI：
10.1126/science.254.5036.1356
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发表时间：
1991-11-29
期刊：
影响因子：
56.9
通讯作者：
ROMANS, K
中科院分区：
文献类型：
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作者：
CARPENTER, EJ;ROMANS, K
重氮蓝细菌Trichodesmium是一种大型（约0.5 × 3毫米）植物浮游生物，常见于热带公海沃茨。对丰度的测量，加上对早期观测的回顾，表明它，而不是微微浮游植物，是热带北大西洋最重要的初级生产者（每天每平方米约165毫克碳）。此外，束毛藻的固氮作用将最大部分的新氮引入真光层，每天每平方米约30毫克氮，这一值超过了跨温跃层的硝酸盐通量。包括这种有机体，再加上丰富的重氮营养内共生体Richelia intracellularis是目前在一些大型硅藻，在碳和氮的生物地球化学研究可能有助于解释贫营养海洋的生产力的各种方法之间的差距。这些大型植物对碳和氮的固定也为海洋中这些元素的生物地球化学引入了一个新的范例。
The diazotrophic cyanobacterium Trichodesmium is a large (about 0.5 by 3 millimeters) phytoplankter that is common in tropical open-ocean waters. Measurements of abundance, plus a review of earlier observations, indicate that it, rather than the picophytoplankton, is the most important primary producer (about 165 milligrams of carbon per square meter per day) in the tropical North Atlantic Ocean. Furthermore, nitrogen fixation by Trichodesmium introduces the largest fraction of new nitrogen to the euphotic zone, approximately 30 milligrams of nitrogen per square meter per day, a value exceeding the estimated flux of nitrate across the thermocline. Inclusion of this organism, plus the abundant diazotrophic endosymbiont Richelia intracellularis that is present in some large diatoms, in biogeochemical studies of carbon and nitrogen may help explain the disparity between various methods of measuring productivity in the oligotrophic ocean. Carbon and nitrogen fixation by these large phytoplankters also introduces a new paradigm in the biogeochemistry of these elements in the sea.