Limnological Institute, Rijksstraatweg 6, 3631 AC Nieuwersluis, and Department of Chemical Technology, University of Amsterdam, 1018 WW Amsterdam, The Netherlands.
Appl Environ Microbiol. 1989 Mar;55(3):754-7. doi: 10.1128/aem.55.3.754-757.1989.
NO(3) concentration profiles were measured in the sediments of a meso-eutrophic lake with a newly developed microelectrode. The depth of penetration of NO(3) varied from only 1.3 mm in organic-rich profundal silty sediments to 5 mm in organic-poor littoral sandy sediments. The thickness of the zone of denitrification in the organic-rich sediments was <500 mum. Oxygen profiles measured simultaneously revealed that the zone of denitrification was directly adjacent to the aerobic zone. The results demonstrate high denitrification rates (0.26 to 1.31 mmol m day) at in situ nitrate concentrations in the overlying water (0.030 mmol liter) and limitation of denitrification by nitrate availability.
采用新开发的微电极测量了中营养湖泊沉积物中的 NO(3)浓度分布。NO(3)的穿透深度在富含有机质的深湖淤泥沉积物中仅为 1.3 毫米，在贫有机质的湖滨砂质沉积物中为 5 毫米。富含有机质沉积物中反硝化带的厚度<500 微米。同时测量的氧浓度分布表明，反硝化带直接毗邻好氧带。结果表明，在表层水中硝酸盐浓度（0.030mmol/L）和硝酸盐可用性限制反硝化作用的条件下，原位具有较高的反硝化速率（0.26 至 1.31mmol/m·d）。
