EXPERIMENTAL STUDIES ON THE STABLE ISOTOPES OF N2O EMITTED FROM SEA ANIMAL COLONY SOILS IN COASTAL ANTARCTICA

doi:10.3724/SP.J.1084.2012.00215

Abstract

Abstract: Nitrous oxide (N₂O) is an important greenhouse gas, mainly emitted from soils during the nitrification and denitrification processes. Measurement of the natural abundance of N₂O stable isotopes is an effective method to distinguish the N₂O 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 more N₂O was formed under N₂ incubation than that under ambient air incubation. For most treatments the soil emitted N₂O was ¹⁵N-depleted compared to local ambient air N₂O. The N₂O concentration often leveled off or even decreased, accompanied by increases in δ¹⁵N and δ¹⁸O of the remaining N₂O. The soil water content and pH also affect the δ¹⁵N and δ¹⁸O values.

Key words: N₂O, Antarctic soils, nitrification and denitrification, δ¹⁵N and δ¹⁸O

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]. ADVANCES IN POLAR SCIENCE, 2012, 24(3): 215-225.

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EXPERIMENTAL STUDIES ON THE STABLE ISOTOPES OF N₂O EMITTED FROM SEA ANIMAL COLONY SOILS IN COASTAL ANTARCTICA

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