Li Siqi, Zhen Yu, Chen Ye, Mi Tiezhu, Yu Zhigang
College of Marine Life Science, Ocean University of China, Qingdao 266003, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China; Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
Mar Pollut Bull. 2023 Jan;186:114390. doi: 10.1016/j.marpolbul.2022.114390. Epub 2022 Nov 29.
NO is among the most potent greenhouse gases. In this study, we investigated one of the important NO production hotspots, the continental margins. We looked at NO spatiotemporal distributions in situ as well as the potential contributions of nitrification and denitrification to NO production in sediment cores from the Bohai and South Yellow Seas. Real-time PCR and shotgun metagenomics sequencing were used to analyze the microbial communities related to NO production. The results showed that NO concentrations roughly decreased with depth-a trend that was consistent throughout the year and showed no significant seasonal variations. When all the research stations along the continental margin were considered, the estuary exhibited the lowest average NO concentration. Moreover, nitrification was identified as the main process responsible for NO production in estuary areas. This study demonstrates that spatial, as opposed to temporal, heterogeneity is the primary factor influencing NO concentration differences in sediments.
一氧化氮是最具影响力的温室气体之一。在本研究中，我们调查了重要的一氧化氮产生热点地区之一——大陆边缘。我们研究了一氧化氮的时空原位分布，以及渤海和南黄海沉积物岩芯中硝化作用和反硝化作用对一氧化氮产生的潜在贡献。采用实时荧光定量聚合酶链反应和鸟枪法宏基因组测序分析与一氧化氮产生相关的微生物群落。结果表明，一氧化氮浓度大致随深度降低，这一趋势全年一致，且无显著季节变化。当考虑大陆边缘所有研究站点时，河口地区的平均一氧化氮浓度最低。此外，硝化作用被确定为河口地区一氧化氮产生的主要过程。本研究表明，与时间异质性相反，空间异质性是影响沉积物中一氧化氮浓度差异的主要因素。
