Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2004877118 |
Physical mixing in coastal waters controls and decouples nitrification via biomass dilution | |
Sebastian Haas; Brent M. Robicheau; Subhadeep Rakshit; Jennifer Tolman; Christopher K. Algar; Julie LaRoche; Douglas W. R. Wallace | |
2021-05-04 | |
发表期刊 | Proceedings of the National Academy of Sciences |
出版年 | 2021 |
英文摘要 | Nitrification is a central process of the aquatic nitrogen cycle that controls the supply of nitrate used in other key processes, such as phytoplankton growth and denitrification. Through time series observation and modeling of a seasonally stratified, eutrophic coastal basin, we demonstrate that physical dilution of nitrifying microorganisms by water column mixing can delay and decouple nitrification. The findings are based on a 4-y, weekly time series in the subsurface water of Bedford Basin, Nova Scotia, Canada, that included measurement of functional (amoA) and phylogenetic (16S rRNA) marker genes. In years with colder winters, more intense winter mixing resulted in strong dilution of resident nitrifiers in subsurface water, delaying nitrification for weeks to months despite availability of ammonium and oxygen. Delayed regrowth of nitrifiers also led to transient accumulation of nitrite (3 to 8 μmol · kgsw−1) due to decoupling of ammonia and nitrite oxidation. Nitrite accumulation was enhanced by ammonia-oxidizing bacteria (Nitrosomonadaceae) with fast enzyme kinetics, which temporarily outcompeted the ammonia-oxidizing archaea (Nitrosopumilus) that dominated under more stable conditions. The study reveals how physical mixing can drive seasonal and interannual variations in nitrification through control of microbial biomass and diversity. Variable, mixing-induced effects on functionally specialized microbial communities are likely relevant to biogeochemical transformation rates in other seasonally stratified water columns. The detailed study reveals a complex mechanism through which weather and climate variability impacts nitrogen speciation, with implications for coastal ecosystem productivity. It also emphasizes the value of high-frequency, multiparameter time series for identifying complex controls of biogeochemical processes in aquatic systems. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/324992 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Sebastian Haas,Brent M. Robicheau,Subhadeep Rakshit,et al. Physical mixing in coastal waters controls and decouples nitrification via biomass dilution[J]. Proceedings of the National Academy of Sciences,2021. |
APA | Sebastian Haas.,Brent M. Robicheau.,Subhadeep Rakshit.,Jennifer Tolman.,Christopher K. Algar.,...&Douglas W. R. Wallace.(2021).Physical mixing in coastal waters controls and decouples nitrification via biomass dilution.Proceedings of the National Academy of Sciences. |
MLA | Sebastian Haas,et al."Physical mixing in coastal waters controls and decouples nitrification via biomass dilution".Proceedings of the National Academy of Sciences (2021). |
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