Nitrogen fixation within a tropical upwelling ecosystem: Evidence for a Redfield budget of carbon/nitrogen cycling by the total phytoplankton community
Nitrogen fixation within a tropical upwelling ecosystem: Evidence for a Redfield budget of carbon/nitrogen cycling by the total phytoplankton community
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热带上升流生态系统内的固氮：整个浮游植物群落碳/氮循环雷德菲尔德预算的证据
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Walsh
中科院分区：
文献类型：
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作者：
J. Walsh
最近的测量和范例表明（1）浮游植物对溶解碳和硝酸盐的吸收可能大于雷德菲尔德比率 6.6，（2）海洋可能因全球固氮和反硝化速率的不平衡而失去氮。事实上，对委内瑞拉和秘鲁上升流生态系统内同时发生的 ΔDIC/ΔNO3 消耗比率的分析表明，10.1-28.6 的值可能适合这些热带富营养化栖息地。固氮至少可以在以前的系统中提供雷德菲尔德平衡，新产量的 34-77% 归因于 N2 的同化。委内瑞拉陆架上此类新产量的独立确认是由邻近卡里亚科海沟内的 H2S 和 DIC 的年际增加提供的。
Recent measurements and paradigms suggest that (1) the uptake of dissolved carbon and nitrate by phytoplankton may be greater than the Redfield ratio of 6.6 and (2) the oceans may be loosing nitrogen from an imbalance in the global rates of nitrogen fixation and denitrification. An analysis of concurrent ΔDIC/ΔNO3 depletion ratios within the Venezuelan and Peruvian upwelling ecosystems, indeed, suggests that values of 10.1–28.6 may pertain to these tropical eutrophic habitats. Nitrogen fixation may provide a Redfield balance in at least the former system, with 34–77% of the new production attributed to assimilation of N2. Independent confirmation of such new production on the Venezuelan shelf is provided by the interannual increases of H2S and DIC within the adjacent Cariaco Trench.