Isotopic Signature of N2O Produced by Marine Ammonia-Oxidizing Archaea

被引：368

作者：

Santoro, Alyson E. ^{[1
]}

Buchwald, Carolyn ^{[2
]}

McIlvin, Matthew R. ^{[1
]}

Casciotti, Karen L. ^{[1
]}

机构：

[1] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA

[2] Massachusetts Inst Technol Woods Hole Oceanog Ins, Joint Program Chem Oceanog, Woods Hole, MA 02543 USA

来源：

SCIENCE | 2011年 / 333卷 / 6047期

基金：

美国国家科学基金会;

关键词：

NITROUS-OXIDE; NITRIFYING ARCHAEA; OXIDATION; NITRIFICATION; NITROSOMONAS; CONSTRAINTS; BACTERIA; BUDGET; NO2;

D O I：

10.1126/science.1208239

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The ocean is an important global source of nitrous oxide (N2O), a greenhouse gas that contributes to stratospheric ozone destruction. Bacterial nitrification and denitrification are thought to be the primary sources of marine N2O, but the isotopic signatures of N2O produced by these processes are not consistent with the marine contribution to the global N2O budget. Based on enrichment cultures, we report that archaeal ammonia oxidation also produces N2O. Natural-abundance stable isotope measurements indicate that the produced N2O had bulk delta N-15 and delta O-18 values higher than observed for ammonia-oxidizing bacteria but similar to the delta N-15 and delta O-18 values attributed to the oceanic N2O source to the atmosphere. Our results suggest that ammonia-oxidizing archaea may be largely responsible for the oceanic N2O source.

引用

页码：1282 / 1285

页数：5

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