Article
Ecology
Cynthia Nevison, Peter Hess, Christine Goodale, Qing Zhu, Julius Vira
Summary: This study evaluates the nitrogen cycling in two Earth System Models (ESMs), finding significant differences in global mineralization, immobilization, plant N uptake, nitrification, and denitrification fluxes between the models. The study also suggests underestimated ratios of nitrification:denitrification and highlights the need for more observational constraints on soil nitrogen fluxes.
ECOLOGICAL APPLICATIONS
(2022)
Article
Oceanography
Calvin W. Mordy, Lisa Eisner, Kelly Kearney, David Kimmel, Michael W. Lomas, Kathy Mier, Peter Proctor, Patrick H. Ressler, Phyllis Stabeno, Eric Wisegarver
Summary: This study investigates the nitrogen deficit on the eastern shelf of the Bering Sea and its influencing factors, concluding that spatial variability is influenced by advection, mixing, and residence time. The study shows that approximately one-third of the inorganic nitrogen entering the shelf is lost, with the most severe deficits observed in certain areas.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Environmental Sciences
Yongkai Chang, Guoyu Yin, Lijun Hou, Min Liu, Yanling Zheng, Ping Han, Hongpo Dong, Xia Liang, Dengzhou Gao, Cheng Liu
Summary: This study investigated the rates of denitrification and anammox in coastal sediments off the north East China Sea, finding that nitrate was a critical factor influencing the ratio between coupled and uncoupled nitrogen removal, and that ammonia oxidizing bacteria may play an important role in the coupled nitrification-denitrification process. These results emphasize the importance of nitrification in nitrogen removal in coastal ecosystems.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Green & Sustainable Science & Technology
Zhaolei Li, Zhaoqi Zeng, Zhaopeng Song, Dashuan Tian, Xingzhao Huang, Sheng Nie, Jun Wang, Lifen Jiang, Yiqi Luo, Jun Cui, Shuli Niu
Summary: This study provides insights into the geographical variations and primary controlling factors of global soil N2O emissions based on a new dataset of soil N2O emission rates compiled from field observations. It highlights the critical roles of soil N substrates on N2O emissions, contributing to the optimization of process-models for soil N2O emissions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Yuanyuan Miao, Liang Zhang, Deshuang Yu, Jianhua Zhang, Wenke Zhang, Guocheng Ma, Xinchao Zhao, Yongzhen Peng
Summary: Intermittent aeration is an effective strategy for biological wastewater treatment, allowing for advanced nitrogen removal and reduced energy consumption. It is suitable for partial nitrification and denitrification processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Ecology
Cynthia Nevison, Christine Goodale, Peter Hess, William R. Wieder, Julius Vira, Peter M. Groffman
Summary: This study compares model simulations with observations and highlights the need for adjustments to better represent nitrogen fluxes in terrestrial systems.
ECOLOGICAL APPLICATIONS
(2022)
Article
Soil Science
Alexandra Meister, Kristin Bohm, Maria Jesus Gutierrez-Gines, Sally Gaw, Nicholas Dickinson, Brett Robinson
Summary: Plants have the ability to modify the nitrogen cycle in soil through various mechanisms, such as N uptake, root exudation, and nitrification inhibition. This study aimed to investigate the impact of New Zealand native plant species on the abundance of nitrifying and denitrifying microorganisms in the soil. The results showed that plant species had a significant effect on the abundance of certain functional genes and the chemical properties of the soil.
APPLIED SOIL ECOLOGY
(2023)
Review
Environmental Sciences
Babita Aryal, Roshni Gurung, Aline F. Camargo, Gislaine Fongaro, Helen Treichel, Bandita Mainali, Michael J. Angove, Huu Hao Ngo, Wenshan Guo, Shukra Raj Puadel
Summary: The acceleration of the nitrogen cycle and nitrous oxide (N2O) emissions at an unprecedented rate has serious implications for the global ecosystem and climate change. The paper reviews how anthropogenic activities have disrupted the nitrogen cycle and estimates the future N2O-N emissions. The study emphasizes the importance of holistic mitigation strategies, policy reforms, and public awareness to tackle N2O emissions and their consequences.
ENVIRONMENTAL POLLUTION
(2022)
Article
Soil Science
Lei Song, Shuli Niu
Summary: Nitrification and denitrification, driven by microbes, play important roles in regulating soil nitrogen availability and nitrogen oxide (N2O) emissions. This study found that enhanced nitrogen deposition generally stimulates both nitrification and denitrification rates, particularly with longer durations of nitrogen addition. The abundances of functional genes AOB amoA and narG were crucial for these responses. These findings challenge the traditional understanding that long-term nitrogen deposition diminishes the positive response of N2O emissions by dampening microbial activity.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Environmental Sciences
Lifei Sun, Chao Wang, Haoming Yu, Dongwei Liu, Benjamin Z. Houlton, Shaofeng Wang, Xiangfeng Zeng, Edith Bai, Yunting Fang, Yongfeng Jia
Summary: Through molecular and isotopic methods, the study found that denitrification is the dominant pathway of sedimentary N-2 production along the continental shelf of China, while anaerobic ammonium oxidation rate is correlated with hzsB gene abundance; temperature and dissolved oxygen regulate denitrification rates by influencing biotic factors such as functional genes and microbial biomass.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Soil Science
Nadine Loick, Elizabeth Dixon, G. Peter Matthews, Christoph Mueller, Veronica S. Ciganda, Maria Lopez-Aizpun, Miguel A. Repullo, Laura M. Cardenas
Summary: This study quantifies the production and consumption pathways of N2O in soil using labelled substrate-N, showing the impact of different water filled pore space on N-transformation processes and emissions. The research highlights the importance of heterotrophic nitrification and denitrification in the N2O emissions, demonstrating the complex relationship between water filled pore space and nitrogen transformations.
Review
Oceanography
Osamu Seki, Yusuke Okazaki, Naomi Harada
Summary: The study evaluates the paleoclimatic utility of long-chain n-alkanes in high northern latitude marine sediments from the Bering Sea, reconstructing variations in their concentration and molecular composition over the past 18 thousand years. The distribution of n-alkanes in sediment cores suggests different sources and transport pathways at the two sites, with chain length distribution patterns resembling sea surface temperature records. This suggests that sedimentary records of n-alkanes reflect surface temperature changes rather than vegetation changes in high northern latitudes.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Microbiology
Rohini Mattoo, B. M. Suman
Summary: Soil microorganisms play a crucial role in regulating the nitrogen cycle and impacting climate change. These microorganisms contribute to the transformation of nitrogen into various bio-available forms, which are essential for metabolic reactions. Recent discoveries have furthered our understanding of microbial involvement in nitrogen cycle reactions in soil and aquatic systems, shedding light on their influence on climate change. This review also emphasizes how anthropogenic activities disrupt the nitrogen cycle and suggests the potential use of beneficial microbes for nitrogen replenishment in agricultural ecosystems.
FEMS MICROBIOLOGY LETTERS
(2023)
Article
Oceanography
Jing Zhu, Min Chen, Wangjiang Hu, Minfang Zheng, Yusheng Qiu
Summary: The study reveals that the nitrogen isotopic composition reflects primary production in summer mainly supported by regenerated nutrients, with nitrification being more pronounced in the slope. There is a difference in nitrate utilization efficiency between the basin and the slope, and the isotopic composition of suspended particulate nitrogen is not a precise indicator of surface nitrate utilization.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Agricultural Engineering
Yumeng Xie, Xiangli Tian, Yu He, Shuanglin Dong, Kun Zhao
Summary: Recently, functional microorganisms capable of eliminating nitrogenous waste have been used in mariculture systems. Strain DN3, a potential candidate for treating mariculture wastewater, showed a high efficiency in removing ammonia, nitrate, and nitrite at various concentrations and conditions. The nitrogen assimilation pathway and bacterial nitrification pathway were investigated, and the results provide important insight into the nitrogen metabolism of Halomonas sp. and support the use of strain DN3 for treating mariculture wastewater.
BIORESOURCE TECHNOLOGY
(2023)
Article
Microbiology
Willm Martens-Habbena, Wei Qin, Rachel E. A. Horak, Hidetoshi Urakawa, Andrew J. Schauer, James W. Moffett, E. Virginia Armbrust, Anitra E. Ingalls, Allan H. Devol, David A. Stahl
ENVIRONMENTAL MICROBIOLOGY
(2015)
Article
Geosciences, Multidisciplinary
Rachel E. A. Horak, Wendi Ruef, Bess B. Ward, Allan H. Devol
GEOPHYSICAL RESEARCH LETTERS
(2016)
Article
Ecology
Rachel E. A. Horak, Wei Qin, Andy J. Schauer, E. Virginia Armbrust, Anitra E. Ingalls, James W. Moffett, David A. Stahl, Allan H. Devol
Article
Marine & Freshwater Biology
Rachel E. A. Horak, Joseph P. Montoya
JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM
(2014)
Article
Chemistry, Multidisciplinary
Jeremy E. Jacquot, Rachel E. A. Horak, Shady A. Amin, Allan H. Devol, Anitra E. Ingalls, E. Virginia Armbrust, David A. Stahl, James W. Moffett
Article
Oceanography
Jason A. Law, Robert H. Weisberg, Yonggang Liu, Dennis A. Mayer, Jeffrey C. Donovan
Summary: Time series data from a moored array of sensors are used to describe the long-term mean circulation and seasonal variations on the West Florida Continental Shelf. The observations reveal a coherent shelf-wide circulation pattern with alongshore and down-coast flow, and a coastal jet separating an upwelling region from a downwelling region influenced by the deeper ocean.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2024)