Article
Plant Sciences
Li Chen, Rong Bo Zheng, Jun Qin Gao, Ming Hua Song, Xue Lian Guo
Summary: The study found that yak excreta application significantly affects the composition of ammonia-oxidizing bacteria communities and nitrification response in meadow marsh soil and marsh soil. Additionally, urease and catalase activities play important roles in influencing the structure of AOB communities.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2021)
Article
Environmental Sciences
Xia Jia, Yunfeng Gao, Xiaodi Li, Yonghua Zhao, Lu Wang, Chunyan Zhang
Summary: This study investigated the impacts of elevated CO2 and cadmium levels on soil nitrification in the rhizosphere of Robinia pseudoacacia L. seedlings. The results showed that elevated CO2 combined with Cd pollution generally stimulated nitrification enzyme activities and influenced bacterial community structures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Soil Science
Haiyang Liu, Hangwei Hu, Xing Huang, Tida Ge, Yongfu Li, Zhenke Zhu, Xingmei Liu, Wenfeng Tan, Zhongjun Jia, Hongjie Di, Jianming Xu, Yong Li
Summary: Chemoautotrophic canonical ammonia-oxidizers play a significant role in autotrophic nitrification during the mineralization of organic substances with low C/N ratios in paddy soils, as shown by N-15 tracing and DNA-SIP techniques.
SOIL BIOLOGY & BIOCHEMISTRY
(2021)
Article
Soil Science
Yongxin Lin, Hang-Wei Hu, Guiping Ye, Jianbo Fan, Weixin Ding, Zi-Yang He, Yong Zheng, Ji-Zheng He
Summary: The meta-analysis of laboratory incubation studies with 1-octyne as the nitrification inhibitor shows that AOB play a more dominant role in soil nitrification in cropland than in wetland soils, indicating a major role of AOB in acidic soil nitrification. Moreover, the reduction of nitrification rate by 1-octyne is greater in soils incubated in slurry and with nitrogen additions, suggesting AOB's importance in nitrification in global acidic soils.
Article
Biotechnology & Applied Microbiology
Elizabeth French, Jessica A. Kozlowski, Annette Bollmann
Summary: The study found that ammonia-oxidizing archaea are more abundant in systems with low ammonium availabilities, while ammonia-oxidizing bacteria are more abundant when ammonium availability increases. Population dynamics of ammonia oxidizers may shift in response to changes in ammonium concentrations.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Microbiology
Jonathan Rodriguez, Seemanti Chakrabarti, Eunkyung Choi, Nisreen Shehadeh, Samantha Sierra-Martinez, Jun Zhao, Willm Martens-Habbena
Summary: The discovery of ammonia-oxidizing archaea (AOA) and complete ammonia-oxidizing (comammox) bacteria in terrestrial ecosystems highlights their important role in nitrification. A nutrient-limited enrichment strategy was found to favor the growth of comammox bacteria with high affinity and yield. Direct enrichment from soil and nutrient-limited sub-cultivation consistently yielded high enrichments of Nitrosocosmicus-affiliated AOA associated with multiple canonical nitrite-oxidizing Nitrospira strains.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Environmental Sciences
Dumsane Themba Matse, Paramsothy Jeyakumar, Peter Bishop, Christopher W. N. Anderson
Summary: This study investigated the effects of applying Cu-complexing compounds on nitrification rate, abundance of ammonia-oxidizing bacteria and archaea genes, and mineral nitrogen leaching in urine patches. The results showed that using organic compounds such as co-poly-acrylic-maleic acid and calcium lignosulphonate can significantly reduce the copper content in the soil, thereby reducing mineral nitrogen leaching.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Ting Lan, Yuxiao Huang, Xi Song, Ouping Deng, Wei Zhou, Ling Luo, Xiaoyan Tang, Jian Zeng, Guangdeng Chen, Xuesong Gao
Summary: Nitrogen management measures such as urease inhibitors, synthetic nitrification inhibitors, and biochar are commonly used in agriculture to mitigate nitrogen loss and increase fertilizer recovery efficiency. In a study conducted on calcareous soil under rice cropping, it was found that a combination of BNIs and UIs had the most effective results in reducing nitrogen loss and improving FRE by utilizing synergistic effects.
ENVIRONMENTAL POLLUTION
(2022)
Article
Plant Sciences
Adrian Bozal-Leorri, Guntur Subbarao, Masahiro Kishii, Leyre Urmeneta, Victor Kommerell, Hannes Karwat, Hans-Joachim Braun, Pedro Ma Aparicio-Tejo, Ivan Ortiz-Monasterio, Carmen Gonzalez-Murua, Ma Begona Gonzalez-Moro
Summary: Synthetic nitrification inhibitors (SNI) and biological nitrification inhibitors (BNI) are promising tools to limit agricultural nitrogen pollution. Introducing the chromosome region (Lr#n-SA) controlling BNI production into wheat cultivars can enhance nitrogen uptake and utilization.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Soil Science
Ting Lan, Mengxiao Li, Xiaoqian He, Ouping Deng, Wei Zhou, Ling Luo, Guangdeng Chen, Shu Yuan, Jing Ling, Min Zeng, Xuesong Gao
Summary: An aerobic N-15 microcosmic experiment was conducted to compare the inhibitory effects of the biological nitrification inhibitor (BNI), methyl 3-(4-hydroxyphenyl) propionate (MHPP) and the synthetic nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on the gross nitrification rate and the abundance and community composition of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in contrasting soils. The results showed that the two inhibitors had different effects on nitrification rates and the response of AOB to the inhibitors was more sensitive.
BIOLOGY AND FERTILITY OF SOILS
(2022)
Article
Environmental Sciences
Feng Wang, Xiaolong Liang, Shihan Ma, Lingzhi Liu, Jingkuan Wang
Summary: The study found that ammonia-oxidizing archaea and ammonia-oxidizing bacteria had significantly higher transcriptional abundance of amoA gene in soils compared to complete ammonia oxidizers, suggesting the former may be the dominant contributors to soil nitrification. Seasonal variation and fertilization regimes substantially affected the abundance of ammonia-oxidizing microbes, with ammonia-oxidizing bacteria being less sensitive to these factors compared to ammonia-oxidizing archaea.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Engineering, Environmental
Guoqiang Liu, Xianwei Wu, Deyong Li, Lugao Jiang, Ju Huang, Li Zhuang
Summary: The study showed that short-term low dissolved oxygen increased N2O emissions, while long-term low DO decreased emissions by increasing the abundance of ammonia oxidizers in the ASP. Long-term low DO reduced AOB abundance but increased AOA, with AOA potentially inhibiting N2O production. The positive correlation between N2O emissions and nitrite concentration became insignificant after 80 days of low DO operation, suggesting that ASPs can reduce N2O production and CO2 emissions by operating with low DO and extended sludge age.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Mingyue Li, Hui He, Tiezhu Mi, Yu Zhen
Summary: In this study, the spatiotemporal dynamics of ammonia-oxidizing archaea (AOA) and bacteria (AOB) and their contribution to nitrification were investigated in the Bohai Sea and Yellow Sea. The results showed that AOA had a greater contribution to nitrification than AOB in coastal sediments, and both seasons and sea areas had significant effects on the abundance and potential nitrification rate of AOA and AOB.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Biodiversity Conservation
Weifang Hu, Mianrun Chen, Xue Lan, Guoliang Li, Bin Wang, Dong Yao Sun, Xianbiao Lin
Summary: This study found significant shifts in potential ammonia oxidation rates (PARs) and gene abundances of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) along different salinity gradients. The PARs were higher under high salinity conditions, and the AOB gene abundance was greater than AOA under moderate and high salinity. This has important implications for nitrogen cycling in estuarine sediments.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Shishi He, Zhirong Zhao, Zhichao Tian, Chi Xu, Yuan Liu, Da He, Yinghui Zhang, Maosheng Zheng
Summary: This study analyzed activated sludge samples from municipal and industrial wastewater treatment plants and found that comammox bacteria were more abundant than ammonia-oxidizing bacteria and ammonia-oxidizing archaea in municipal plants, while this trend did not hold true for industrial plants. Furthermore, a higher diversity of comammox bacteria was found in municipal samples. This study provides important insights into the abundance and diversity of comammox bacteria in municipal and refinery wastewater treatment systems.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Ecology
Brian J. Roberts, Natalie A. Griffiths, Jeffrey N. Houser, Patrick J. Mulholland
Summary: The study evaluated the ecological effectiveness of adding coarse woody debris to streams and found that heavily disturbed streams responded most strongly to the additions. However, the benefits of CWD additions were only short-term, as continued high erosion rates resulted in the burial of added CWD and a return to pre-addition levels of ecosystem metabolism rates. Therefore, future restoration efforts should consider the intensity of disturbances in selecting restoration locations.
Article
Limnology
Phaedra Budy, Casey A. Pennock, Anne E. Giblin, Chris Luecke, Daniel L. White, George W. Kling
Summary: The study found that climate change-driven disturbances in lakes can lead to increased nutrient loading, affecting ecosystem function. A fertilization experiment showed varying responses in phytoplankton chlorophyll a, dissolved oxygen, and zooplankton biomass during the fertilization period, with delayed declines in water transparency and fish abundance. This suggests that indirect effects of climate change altering nutrient inputs may impact many lakes in the future.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Adri K. Grow, Charles A. Schutte, Brian J. Roberts
Summary: The study reveals the significant influence of fiddler crab bioturbation on greenhouse gas emissions in salt marshes, while oil pollution has a relatively minor impact.
Article
Ecology
Scott Zengel, Jennifer Weaver, Irving A. Mendelssohn, Sean A. Graham, Qianxin Lin, Mark W. Hester, Jonathan M. Willis, Brian R. Silliman, John W. Fleeger, Giovanna McClenachan, Nancy N. Rabalais, R. Eugene Turner, A. Randall Hughes, Just Cebrian, Donald R. Deis, Nicolle Rutherford, Brian J. Roberts
Summary: The Deepwater Horizon oil spill had multiyear impacts on salt marsh vegetation, with most plant metrics showing significant reductions and requiring three years or longer for recovery. Concerningly, belowground biomass declined over time and may have long-term impacts on ecosystem processes and associated species. Full recovery is likely to exceed 10 years, particularly in heavily oiled marshes.
ECOLOGICAL APPLICATIONS
(2022)
Review
Environmental Sciences
Dubravko Justic, Villy Kourafalou, Giulio Mariotti, Songjie He, Robert Weisberg, Yannis Androulidakis, Christopher Barker, Annalisa Bracco, Brian Dzwonkowski, Chuanmin Hu, Haosheng Huang, Gregg Jacobs, Matthieu Le Henaff, Yonggang Liu, Steven Morey, Jeffrey Nittrouer, Edward Overton, Claire B. Paris, Brian J. Roberts, Kenneth Rose, Arnoldo Valle-Levinson, Jerry Wiggert
Summary: Transport processes are important factors that modulate the estuarine and coastal geomorphology, biogeochemistry, water quality, and coastal food webs in river-dominated shelves of the Gulf of Mexico. These processes control the fate of river-borne sediments, nutrients, and carbon, influencing issues such as land loss, eutrophication, hypoxia, harmful algal blooms, and coastal acidification. Furthermore, transport of pollutants such as pesticides, herbicides, heavy metals, and oil into estuaries and coastal systems is also influenced by these processes. The Gulf of Mexico Research Initiative (GoMRI) has provided significant opportunities to study transport processes in the region and improve understanding for more accurate forecasting and response strategies in the event of environmental disasters such as oil spills.
ESTUARIES AND COASTS
(2022)
Article
Environmental Sciences
Scott F. Jones, Charles A. Schutte, Brian J. Roberts, Karen M. Thorne
Summary: The study examined the influence of wetland management history on ecosystem structure and nutrient cycling in Suisun Marsh, California, finding that water management exerted stronger control on ecosystem processes and structure than surface fire disturbance. Despite differences in predisturbance conditions, all soil processes recovered to baseline levels within 6 months after the fire, with no evidence of plant community change 1 year later.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Julia A. Sweet, Sibel Bargu, Wendy L. Morrison, Michael Parsons, Mrunmayee G. Pathare, Brian J. Roberts, Thomas M. Soniat, Beth A. Stauffer
Summary: This paper synthesizes data from four Louisiana estuaries to characterize trends in phytoplankton biomass, community composition, and the environmental factors influencing them. Results show that salinity variability often explains biomass trends, while temperature is a significant explanatory variable for only one system. Understanding these dynamics is critical for predicting the effects of ongoing change.
MARINE POLLUTION BULLETIN
(2022)
Article
Multidisciplinary Sciences
Ashley M. McDonald, Charles W. Martin, Guillaume Rieucau, Brian J. Roberts
Summary: This study provides experimental evidence that previous oil exposure has potential sublethal effects on the foraging ability of Gulf killifish. Exposure to high oil concentrations reduced foraging rate by an average of about 37%, while the response to moderate concentrations varied greatly and the response to low concentrations was similar to that of the unexposed group. The study suggests that oil spills may have an impact on energy transfer between saltmarsh and off-marsh systems.
Article
Environmental Sciences
Kiran Upreti, Victor H. Rivera-Monroy, Kanchan Maiti, Anne E. Giblin, Edward Castaneda-Moya
Summary: This study evaluates the effects of temperature and soil/sediment organic matter content on denitrification and DNRA rates in oligohaline wetlands. The results show that DNRA is not a major nitrogen transformation process in these regions across the Mississippi River Delta Plain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Editorial Material
Environmental Sciences
Charles W. Martin, Ashley M. McDonald, John F. Valentine, Brian J. Roberts
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Ecology
Friedrich W. Keppeler, James R. Junker, Margaret J. Shaw, Scott B. Alford, Annette S. Engel, Linda M. Hooper-Bui, Olaf P. Jensen, Katelyn Lamb, Paola C. Lopez-Duarte, Charles W. Martin, Ashley M. McDonald, Jill A. Olin, Audrey T. Paterson, Michael J. Polito, Nancy N. Rabalais, Brian J. Roberts, Ryann E. Rossi, Erick M. Swenson
Summary: Coastal wetlands are disappearing rapidly due to climate change and flood control measures. The study compares the biodiversity of different assemblages between created marshes and reference marshes. The results suggest generally similar taxonomic diversity and composition between created and reference marshes, supporting the use of marsh habitat for coastal biodiversity restoration.
Editorial Material
Environmental Sciences
Charles W. Martin, Paola C. Lopez-Duarte, Jill A. Olin, Brian J. Roberts
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Biotechnology & Applied Microbiology
Sherlynette Perez Castro, Elena L. Peredo, Olivia U. Mason, Joseph Vineis, Jennifer L. Bowen, Behzad Mortazavi, Anakha Ganesh, S. Emil Ruff, Blair G. Paul, Anne E. Giblin, Zoe G. Cardon
Summary: The study reveals the high diversity of sulfur-cycling microbial communities in salt marsh rhizosphere sediments, with their distribution and genomic features influenced by geographical location and plant species.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Environmental Sciences
Roxanne Marino, Melanie Hayn, Robert W. Howarth, Anne E. Giblin, Karen J. Mcglathery, Peter Berg
Summary: This study is part of a long-term research on the effects of nitrogen loading in a shallow temperate lagoon. The results show that nitrogen fixation rates associated with seagrass epiphytes are relatively high, despite the high nitrogen input from contaminated groundwater. Cyanobacteria play an important role in the epiphyte communities. The study also suggests that climatic variation contributes to inter-annual variation in nitrogen fixation rates.
Article
Environmental Sciences
Kiva L. Oken, Kenneth W. Able, Kim de Mutsert, F. Joel Fodrie, Paola C. Lopez-Duarte, Charles W. Martin, Michael J. McCann, Jill A. Olin, Michael J. Polito, Brian J. Roberts, Olaf P. Jensen
Summary: The Deepwater Horizon disaster released a huge amount of oil into the Gulf of Mexico, but there has been little evidence of population-level declines of most nearshore fish and invertebrate populations. The fishing moratorium following the spill and reductions in predation pressure may explain this paradox. The study used food web models to quantify the impacts and found that the fishing moratorium was the most likely mitigating mechanism.
ESTUARIES AND COASTS
(2023)