Nitrogen uptake rates in phytoplankton and ice algae in the Barents Sea
Nitrogen uptake rates in phytoplankton and ice algae in the Barents Sea
复制标题
巴伦支海浮游植物和冰藻的氮吸收率
DOI：
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复制
发表时间：
1991
期刊：
影响因子：
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通讯作者：
T. Farbrot
中科院分区：
文献类型：
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作者：
S. Kristiansen;T. Farbrot
NH4+、NO3？和溶解有机氮（尿素）在浮游植物和冰藻在巴伦支海使用15 N-技术进行了测量。NO3？是冰藻最重要的氮源（f-比率= 0.92）。在地下叶绿素最大值和冰藻群落的原位辐照度低。现场NO3？在冰藻群落的吸收率是光限制的原位NO3？NH4？次表层叶绿素最大值的吸收速率有时受光限制。据推测，NH 4+可能积累在低光底部的真光层，并抑制原位NO3？摄取率
Uptake rates of NH4+, NO3? and dissolved organic nitrogen (urea) were measured in phytoplankton and in ice algae in the Barents Sea using a 15N-technique. NO3? was the most important nitrogen source for the ice algae (f-ratio = 0.92). The in situ irradiances in the subsurface chlorophyll maximum and in the ice algal communities were low. The in situ NO3? uptake rate in the ice algal communities was light-limited The in situ NO3? and NH4? uptake rates in the subsurface chlorophyll maximum were at times light-limited. It is hypothesised that NH4+ may accumulate in low light in the bottom of the euphotic zone and inhibit the in situ NO3? uptake rate.