当前位置: X-MOL 学术Environ. Sci. Technol. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Anaerobic Ammonium Oxidation Linked to Microbial Reduction of Natural Organic Matter in Marine Sediments
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2018-08-16 , DOI: 10.1021/acs.estlett.8b00330
E. Emilia Rios-Del Toro 1 , Edgardo I. Valenzuela 1 , J. Ernesto Ramírez 1 , Nguyen E. López-Lozano 1 , Francisco J. Cervantes 1
Affiliation  

Identification of microbial processes driving the loss of nitrogen from the oceans is of paramount relevance as these processes affect primary productivity in these ecosystems, which ultimately affects global biogeochemical cycles. Denitrification and anammox (anaerobic ammonium oxidation coupled to nitrite reduction) are the only identified processes so far that lead to nitrogen loss in marine environments. Here we provide stoichiometric and spectroscopic evidence, as well as tracer analysis with [15N]ammonium, revealing that anaerobic ammonium oxidation linked to the microbial reduction of natural organic matter (NOM) fuels nitrogen loss in marine sediments from the eastern tropical North Pacific coast. Tracer analysis revealed that the NOM-dependent anammox process was responsible for producing ∼1.5 μg of 15N2 (g of sediment)−1 day–1 after incubation for 27 days in sediment incubations amended with Pahokee peat, while intrinsic NOM present in the sediment promoted the production of ∼0.4 μg of 15N2 (g of sediment)−1 day–1. Taxonomic characterization, based on 16S rRNA gene sequencing, of the biota present in marine sediments performing the NOM-dependent anammox process revealed several microbial members are potentially involved. The most predominant bacterial phylotypes detected were associated with Phycisphaeraceae, Actinomarinales, Acidiferrobacteraceae, and Rhodobacteraceae, while Nitrosopumilaceae was the only archaeal family whose level clearly increased during the course of NOM-dependent anammox. This is a novel pathway interconnecting the oceanic biogeochemical cycles of N and C, which may significantly propel nitrogen fluxes in organic-rich, coastal marine sediments.

中文翻译:

厌氧铵氧化与微生物对海洋沉积物中天然有机物的还原作用有关

鉴定导致海洋中氮损失的微生物过程至关重要,因为这些过程会影响这些生态系统的初级生产力,最终影响全球生物地球化学循环。迄今为止,唯一识别出的反硝化和厌氧氨氧化(厌氧铵氧化与亚硝酸盐还原相结合)会导致海洋环境中氮的流失。在这里,我们提供化学计量和光谱学证据,以及[ 15 N]铵的示踪分析,揭示厌氧铵氧化与天然有机物(NOM)的微生物还原有关,助长了北太平洋东部热带沿海海洋沉积物中的氮损失。 。示踪剂分析表明,依赖NOM的厌氧氨氧化工艺可产生约1.5μg的15 Ñ 2(克沉积物) -1-1孵育与帕霍基泥炭修正沉淀孵育27天,之后,同时存在于沉积物固有NOM促进了生产〜0.4微克的15 Ñ 2(克沉积物)- 1–1。根据16S rRNA基因测序,对海洋沉积物中存在的生物群进行NOM依赖性厌氧氨氧化过程的分类学表征表明,可能涉及到多种微生物。所检测到的最主要细菌系统型与Phycisphaeraceae,Actinomarinales,Acidiferrobacteraceae和Rhodobacteraceae有关,而Nitrosopumilaceae是唯一的古细菌家族,其水平在依赖NOM的厌氧菌过程中明显升高。这是一条互连N和C的海洋生物地球化学循环的新途径,这可能会显着推动富含有机物的沿海海洋沉积物中的氮通量。
更新日期:2018-08-17
down
wechat
bug