Nitrous oxide in brackish Lake Nakaumi, Japan II: the role of nitrification and denitrification in N2O accumulation
Nitrous oxide in brackish Lake Nakaumi, Japan II: the role of nitrification and denitrification in N2O accumulation
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DOI：
10.1007/s102010200002
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发表时间：
2002-04
期刊：
影响因子：
1.6
通讯作者：
Y. Senga;K. Mochida;N. Okamoto;R. Fukumori;Y. Seike
中科院分区：
文献类型：
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作者：
Y. Senga;K. Mochida;N. Okamoto;R. Fukumori;Y. Seike
为了解中海咸水湖亚表层水体中硝化和反硝化作用在氧化亚氮（N2 O）积累中的作用，通过培养试验研究了溶解氧（DO）浓度对硝化和反硝化作用的影响. N2 O是在硝化过程中NH 4+氧化为NO2−和反硝化过程中NO3−还原为N2的过程中产生的。随着DO浓度的降低，硝化作用产生N2 O的活性（N2 ON）显著增加。低DO（10%-30%饱和度）诱导高N2 ON。与硝化作用相反，反硝化作用产生N2 O的活性（N2 OD）随着DO浓度的降低而降低。在低DO（10%~ 30%）条件下，反硝化过程中N2 O的积累较少，主要是N2 O进一步还原为N2。因此，可以假设，作为硝化的副产品产生的N2 O是同时减少到N2的反硝化低DO条件下。这将导致在活性硝化过程中没有大量的N2 O积累在中海湖的地下水。
In order to understand the role of nitrification and denitrification in the accumulation of nitrous oxide (N2O) in the hypolimnetic water of brackish Lake Nakaumi, the effects of dissolved oxygen (DO) concentration on these activities were investigated by incubation experiments. N2O was produced during the oxidation of NH4+to NO2−in nitrification and during the reduction of NO3−to N2in denitrification. N2O-producing activity by nitrification (N2ON) increased markedly with decreasing concentrations of DO. Low DO (10%–30% saturation) induced high N2ON. In contrast to nitrification, N2O-producing activity by denitrification (N2OD) decreased with decreasing concentrations of DO. Little N2O was accumulated during denitrification under low-level conditions of DO (10%–30%), because of further reduction of N2O to N2. It can therefore be assumed that N2O produced as the by-product of nitrification is concurrently reduced to N2by denitrification under low-DO conditions. This would result in no substantial accumulation of N2O during active nitrification in the hypolimnetic water of Lake Nakaumi.