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首页> 外文期刊>Estuarine Coastal and Shelf Science >Microbial uptake of dissolved organic and inorganic nitrogen in Randers Fjord
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Microbial uptake of dissolved organic and inorganic nitrogen in Randers Fjord

机译：兰德斯峡湾中溶解性有机氮和无机氮的微生物吸收

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摘要

Uptake of ~(15)N labeled NH_4~+, NO_3~-, urea and dissolved free amino acids (DFAA) was measured in April and August 2001 at 6 stations along the salinity gradient of Randers Fjord (Denmark) in order to clarify the relative importance of dissolved organic and inorganic nitrogen (DON and DIN) as N sources for the estuarine planktonic microbial community. Although microbial N uptake was generally dominated by DIN (especially NH_4~+), DON (both urea and DFAA) also served as an important N source and occasionally dominated uptake. Uptake of ~(15)N labeled algal derived DON was measured in an attempt to mimic uptake of the complex ambient DON pool. Uptake rates for the algal derived DON in April were similar to those for NH_4~+ and even higher than the summed uptake of NH_4~+, NO_3~-, urea and DFAA in August, suggesting that DON other than urea and DFAA. likely dissolved combined amino acids (DCAA), also served as an important N source. In addition, the relative contributions of hcterotrophic bacteria and phytoplankton to total microbial N uptake was estimated from bacterial productivity and measured by inhibiting bacterial N uptake with antibiotics.
机译：2001年4月和2001年8月在沿Randers Fjord（丹麦）盐度梯度的6个站测量了〜（15）N标记的NH_4〜+，NO_3〜-，尿素和溶解的游离氨基酸（DFAA）的吸收，以阐明溶解的有机和无机氮（DON和DIN）作为河口浮游微生物群落的氮源的相对重要性。尽管微生物氮的吸收通常由DIN（尤其是NH_4〜+）决定，但是DON（尿素和DFAA）也是重要的N来源，偶尔也占主导。测量了〜（15）N标记的藻类衍生DON的摄取，以模拟复杂环境DON池的摄取。 4月份藻类衍生的DON的吸收速率与NH_4〜+相似，甚至高于8月份的NH_4〜+，NO_3〜-，尿素和DFAA的总吸收，表明DON除了尿素和DFAA外。可能是溶解的组合氨基酸（DCAA），也是重要的氮源。另外，从细菌生产力估计了嗜肥性细菌和浮游植物对总微生物氮吸收的相对贡献，并通过抑制抗生素对细菌氮的吸收来测量。

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