Nitrous oxide production from nitrification and denitrification in marine sediment at low oxygen concentrations
Nitrous oxide production from nitrification and denitrification in marine sediment at low oxygen concentrations
复制标题
低氧浓度下海洋沉积物硝化和反硝化作用产生一氧化二氮
DOI：
10.1139/m84-167
复制
发表时间：
1984
影响因子：
2.8
通讯作者：
J. Sørensen
中科院分区：
文献类型：
--
作者：
K. Jørgensen;H. B. Jensen;J. Sørensen
在NH4Cl-和KNO3修正的海洋沉积物悬浮液中，同时测定了N2O的产生(释放游离N2O)、硝化和反硝化作用。设计了一套明流系统，用于向底泥施加低分压O2(0-10 kpa)。在最低氧分压(0-0.2kPa.2 )时，N2O产生速率显著增加，在完全缺氧时达到最大值。用缓蚀剂分离硝化和反硝化过程后，测定了硝化和反硝化产生N2O的比速率。在0~0.2kPaO2范围内，N2On产生率最大为0.1kPaO2，占总硝化(氧化)活性的25%。然而，随着O2降至零，N2Od的产生率继续增加。在较高的氧分压下，N2Od占总N2Od+N2的比例增大，在5 kPa时达到最大值约50%。
Measurements of N2O production (release of free N2O), nitrification, and denitrification were made simultaneously in NH4Cl- and KNO3-amended suspensions of marine sediment. An open flow system was designed for the application of low partial pressures of O2 (0–10 kPa) to the sediment. The overall rate of N2O production increased dramatically at the lowest O2 tensions (0–0.2 kPa) and had a maximum at complete anoxia. The specific rates of N2O production from nitrification (N2On) and from denitrification (N2Od) were determined after separation of the processes with inhibitors. Within the range of 0–0.2 kPa O2, the rate of N2On production showed an apparent maximum of 0.1 kPa O2 where the production accounted for 25% of the total activity of nitrification ( oxidation). The rate of N2Od production, however, continued to increase as the O2 fell to zero. The proportion of N2Od to the total N2Od plus N2 produced from denitrification increased at the higher O2 tensions and reached the maximum of about 50% at 5 kPa...