Nitrogen dynamics in lower Narragansett Bay. II. Phytoplankton uptake, depletion rates of nitrogenous nutrient pools, and estimates of ecosystem remineralization
Nitrogen dynamics in lower Narragansett Bay. II. Phytoplankton uptake, depletion rates of nitrogenous nutrient pools, and estimates of ecosystem remineralization
复制标题
纳拉甘西特湾下游的氮动态。
DOI：
10.1093/plankt/8.4.755
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发表时间：
1986
影响因子：
2.1
通讯作者：
Ellen A. Deason
中科院分区：
文献类型：
--
作者：
M. Furnas;T. Smayda;Ellen A. Deason
本文比较了1977- 1978年冬春和1978 - 1979年夏季在罗得岛下纳拉甘塞特湾浮游植物氮需求量与浮游动物氮需求量的估计值和根据实验现场研究结果得出的底栖氮平衡值。测得的吸收率通常会导致可用的含氮营养物质在数小时内耗尽，而且通常会超过底栖生物加上浮游动物的矿化估计数。对来自污水和河流来源的氮输入的额外估计似乎不足以弥补这一差额。这种差异支持了这样一种范式，即微异养生物的水柱矿化可能提供了沿海浮游植物氮需求的大部分（如果不是大部分的话）。
Phytoplankton nitrogen demand in lower Narragansett Bay, Rhode Island, measured during the winter-spring of 1977–78 and summers of 1978 and 1979, is compared with estimates of zooplankton and the benthic nitrogen remineralization drawn from the results of ekperimental field studies. Measured uptake rates would generally lead to the depletion of available nitrogenous nutrient stocks within hours, and usually exceeded estimates of benthic plus zooplankton remineralization. Additional estimates of nitrogen inputs from sewage and riverine sources appear insufficient to make up the difference. The discrepancy lends support to the paradigm that water column remineralization by microheterotrophs may supply much, if not most, of the nitrogen needs of coastal phytoplankton.