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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis
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Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis

机译：通过一氧化二氮同位异构体分析阐明了日本木崎湖中一氧化二氮的生物地球化学

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摘要

The biogeochemistry of nitrous oxide (N _2O) was investigated in Lake Kizaki, Japan, where accumulation of N _2O in the water column has been observed. The N _2O concentration profile showed weak accumulation in the oxic zone, although much higher and much lower N _2O concentrations were observed in the deeper oxygen-deficient zone. Intramolecular partitioning of ~(15)N (site preference) of N _2O within the oxic zone increased concomitantly with increased N _2O concentration. The site preference of the newly produced N _2O in the oxic zone was estimated as 33.6‰. This high site preference strongly suggests that this N _2O was produced by hydroxylamine oxidation. In regions of the oxygen-deficient zone, the nitrate (NO _3 ~-) concentration decreased rapidly, concomitantly with increased nitrogen (δ ~(15)NNO_3 ~-) and oxygen (δ ~(18)O _(NO3-)) isotope ratios, indicating denitrification. The high site preference and nitrogen isotope ratio of N _2O (δ ~(15)N ~(bulk)), combined with isotopic data of NO _3 ~-, strongly suggest denitrification as the main N _2O source. Moreover, site preference and δ ~(15)N bulk data suggest that the existing N _2O in the oxygen-deficient zone was already strongly reduced (more than 75%) to N _2. Results of this study demonstrate the feasibility of using isotope and isotopomer analyses of N compounds to elucidate the complex biogeochemistry of N _2O in an intact ecosystem.
机译：一氧化二氮（N _2O）的生物地球化学在日本木崎湖进行了研究，其中观察到N _2O在水柱中的积累。尽管在较深的缺氧区中观察到的N_2O浓度高得多且低得多，但N _2O浓度分布在含氧区中的显示较弱。 N _2O〜〜（15）N（位点优先）在分子内的分子内分配随N _2O浓度的增加而增加。在该含氧区中，新产生的N _2O的位置偏爱估计为33.6‰。这种较高的位点偏爱强烈表明该N _2O是由羟胺氧化产生的。在缺氧区，硝酸盐（NO _3〜-）浓度迅速降低，同时氮（δ〜（15）NNO_3〜-）和氧（δ〜（18）O _（NO3-））浓度升高。同位素比率，表明反硝化作用。 N _2O（δ〜（15）N〜（体））的高位点偏爱和氮同位素比，再加上NO _3〜-的同位素数据，强烈表明反硝化是主要的N _2O源。此外，位点偏好和δ〜（15）N大量数据表明，缺氧区中现有的N _2O已被强烈还原（超过75％）为N _2。这项研究的结果证明了使用N化合物的同位素和同位素分析来阐明完整生态系统中N _2O的复杂生物地球化学的可行性。

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