| 南极海洋动物粪土源N2O稳定同位素实验研究 |
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| 引用本文： | 白波,朱仁斌,徐华,刘雅淑.南极海洋动物粪土源N2O稳定同位素实验研究[J].极地研究,2012,24(3):215-225. |
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| 作者姓名： | 白波 朱仁斌 徐华 刘雅淑 |
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| 作者单位： | 1.中国科学技术大学地球和空间科学学院极地环境研究室, 安徽 合肥 230026；
;2.中国科学院南京土壤所土壤与农业可持续发展国家重点实验室, 江苏 南京 210008 |
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| 基金项目： | 南极苔原氧化亚氮同位素变化特征及其对氧化亚氮产生机理的识别 |
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| 摘 要： | N2O是一种重要的温室气体，土壤是全球N2O的重要排放源。通过测定土壤源N2O中N、O同位素值，可以有效识别N2O的来源途径。本文采集了南极法尔兹半岛两个地点的海豹粪土（HS和GS）、阿德雷岛两个地点的企鹅粪土(AB和AF)以及东南极的帝企鹅粪土(DQ和DQT)，在室内对所采集的样品分别在有氧和厌氧条件下进行冻融培养实验。结果表明：土壤在厌氧条件下比有氧条件下排放了更多的N2O。土壤排放的N2O与当地大气N2O相比普遍贫15N和18O。除DQT和HS外， δ15N和δ18O在有氧和厌氧培养下均呈现很好的正相关性。N2O排放量下降的同时伴随着培养瓶内剩余N2O中δ15N和δ18O 值的增加，证实N2O还原为N2的过程会引起重同位素富集。高的水分含量有利于土壤反硝化作用的进行，使释放的N2O气体富集重同位素；pH值也会影响N2O的同位素组成，低pH会引起δ15N值增加。
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| 收稿时间： | 2012-02-29 |
EXPERIMENTAL STUDIES ON THE STABLE ISOTOPES OF N2O EMITTED FROM SEA ANIMAL COLONY SOILS IN COASTAL ANTARCTICA |
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| Bai Bo,Zhu Renbin,Xu Hua,Liu Yashu.EXPERIMENTAL STUDIES ON THE STABLE ISOTOPES OF N2O EMITTED FROM SEA ANIMAL COLONY SOILS IN COASTAL ANTARCTICA[J].Chinese Journal of Polar Research,2012,24(3):215-225. |
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| Authors: | Bai Bo Zhu Renbin Xu Hua Liu Yashu |
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| Abstract: | Nitrous oxide (N2O) is an important greenhouse gas, mainly emitted from soils during the nitrification and denitrification processes. Measurement of the natural abundance ofN2O stable isotopes is an effective method to distinguish theN2O sources from nitrification and denitrification. In this paper, we studied the soils from Fildes Peninsula (HS and GS), Ardley Island (AB and AF) and Emperor penguin colony (DQ and DQT) in Antarctic, and examined the isotopic compositions ofN2O through laboratory incubation experiments under N2 and under ambient air conditions, respectively. Results showed that much moreN2O was formed under N2 incubation than that under ambient air incubation. For most treatments the soil emittedN2O was 15N-depleted compared to local ambient airN2O. TheN2O concentration often leveled off or even decreased, accompanied by increases in δ15N and δ18O of the remainingN2O. The soil water content and pH also affect the δ15N and δ18O values. |
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| Keywords: | N2O Antarctic soils nitrification and denitrification δ15N and δ18O |
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