The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean
The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean
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作者：
Karl, D;Letelier, R;Hebel, D
对北太平洋副热带环流生物地球化学过程的7年时间序列观测揭示了大尺度海洋-大气相互作用下微生物群落结构和养分循环机制的剧烈变化。几条独立的证据线表明，蓝藻对大气氮的固定可以为新产量的一半提供燃料。这些和其他观察结果要求重新评估目前对地球上最大的生物群落之一的营养和碳循环的看法。
Seven years of time-series observations of biogeochemical processes in the subtropical North Pacific Ocean gyre have revealed dramatic changes in the microbial community structure and in the mechanisms of nutrient cycling in response to large-scale ocean-atmosphere interactions. Several independent lines of evidence show that the fixation of atmospheric nitrogen by cyanobacteria can fuel up to half of the new production. These and other observations demand a reassessment of present views of nutrient and carbon cycling in one of the Earth's largest biomes.