Article
Environmental Sciences
Yuhui Niu, Zhirui An, Dengzhou Gao, Feiyang Chen, Jie Zhou, Bolin Liu, Lin Qi, Li Wu, Zhuke Lin, Guoyu Yin, Xia Liang, Hongpo Dong, Min Liu, Lijun Hou, Yanling Zheng
Summary: Tide-driven hydrodynamic process influences biogeochemical cycling and ecological functioning of estuarine and coastal ecosystems. However, the effects of tidal dynamics on microbial communities at the functional gene level remain unclear. This study reveals the stratification of microorganisms related to C, N, and S cycles along vertical redox gradients in intertidal wetlands. The influence of tidal dynamics on sediment function is highly associated with redox state, sediment texture, and substrate availability, leading to a distinct distribution pattern of metabolic coupling of microbes involved in energy flux and elemental cycling in intertidal wetlands.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Fangyuan Dong, Xuelu Dong, Chuansheng Cui, Suyuan Zeng, Chonggang Fu, Lei Wang
Summary: A solvothermal process was used to synthesize Cu2+-doped MnCO3 micro-rhombohedrons and micro-olives, with the morphology of the MnCO3 particles adjustable by the amount of Cu(NO3)2·3H2O in the reactants. The electrochemical behavior of the MnCO3 samples was investigated through various tests. The olive-shaped MnCO3 displayed a reversible capacity of 823.5 mA h g(-1) over 1000 cycles at 0.5 A g(-1), and a specific capacity of 325.3 mA h g(-1) at a current density of 5.0 A g(-1). Pseudocapacitive effective was used to analyze the electrochemical kinetics of the MnCO3 microstructures. The Cu2+-doped MnCO3 materials showed great potential for high-efficiency energy storage devices.
Article
Geosciences, Multidisciplinary
Yongwen Liu, Da Wei, Tenzintarchen, Jingxue Zhao, Xiaodong Geng, Dongxue Dai, Xu-Ri
Summary: Nitrogen deposition has played a critical role in increasing terrestrial carbon sinks, particularly in rangelands. This study investigated the effects of multilevel nitrogen addition on soil nitrogen characteristics and ecosystem carbon fluxes in an alpine pasture on the Tibetan Plateau over a 4-year period. The results showed that nitrogen addition led to increased soil inorganic nitrogen levels, primarily driven by soil NO3--N enrichment, and had varying effects on ecosystem processes, such as belowground biomass and root:shoot ratio.
Article
Engineering, Environmental
Guochen Wang, Adam C. Hambly, Guan Wang, Kai Tang, Henrik R. Andersen
Summary: In this study, an engineered cycle of manganese reduction followed by oxidation was successfully implemented in a two-stage moving bed biofilm reactor for continuous micropollutant removal. The mass balance assessment showed that the manganese redox cycling functioned well and biogenic manganese oxides were continuously regenerated. Specific micropollutants were efficiently removed by the staged MBBR.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Adam Subhas, Sijia Dong, John D. Naviaux, Nick E. Rollins, Patrizia Ziveri, William Gray, James W. B. Rae, Xuewu Liu, Robert H. Byrne, Sang Chen, Christopher Moore, Loraine Martell-Bonet, Zvi Steiner, Gilad Antler, Huanting Hu, Abby Lunstrum, Yi Hou, Nathaniel Kemnitz, Johnny Stutsman, Sven Pallacks, Mathilde Dugenne, Paul D. Quay, William M. Berelson, Jess F. Adkins
Summary: The cycling of biologically produced calcium carbonate in the ocean is crucial for the global carbon cycle. This study investigates the dissolution rates of coccolith and foraminiferal calcite and combines them with other data to understand the alkalinity cycle in the shallow North Pacific Ocean. The findings show that the dissolution rates are too slow to explain the sinking flux of calcium carbonate and the regeneration of alkalinity. Instead, the dissolution is driven by the ambient saturation state and oxygen consumption, which explains the patterns of calcium carbonate flux and alkalinity regeneration in the North Pacific.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Electrochemistry
Fan Yang, Yue Zheng, Xiaochun Tian, Yan Liu, Jinhua Li, Zongze Shao, Feng Zhao
Summary: The study demonstrated that Bacillus horikoshii biET1 can oxidize manganese ions into manganese oxides under oxic conditions and rapidly reduce biogenic Mn(III/IV) oxides under anoxic conditions. The redox cycling of microbial manganese metabolism is reversible and sustainable.
ELECTROCHIMICA ACTA
(2021)
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)
Review
Environmental Sciences
Shuo Yin, Junjian Wang, Hui Zeng
Summary: Understanding carbon cycling in blue carbon ecosystems is crucial for carbon sequestration and climate change mitigation. This study conducted bibliometric analysis on carbon cycling in salt marsh, mangrove, and seagrass ecosystems, revealing research hotspots and frontiers. The research interest in this field has greatly increased over time, especially for mangroves, with the USA being a major contributor. The study highlights the need for further research on lateral carbon exchange, carbonate burial, and the impacts of climate change and restoration on blue carbon.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Rokas Sazinas, Suzanne Zamany Andersen, Katja Li, Mattia Saccoccio, Kevin Krempl, Jakob Bruun Pedersen, Jakob Kibsgaard, Peter Christian Kjaergaard Vesborg, Debasish Chakraborty, Ib Chorkendorff
Summary: The liquid electrolytes after electrochemical ammonia synthesis can be analyzed using GCMS and EI-MS techniques to determine molecular composition and byproduct formation mechanisms.
Review
Engineering, Environmental
Yue Wang, Yihan Bai, Junfeng Su, Amjad Ali, Zhihong Gao, Tinglin Huang, Meng Cao, Miqi Ren
Summary: Nitrogen pollution is a major threat to global sustainable development and has recently gained increased attention. The combination of microbially mediated Mn redox cycling and N removal shows promise as an economical, efficient, and environmentally friendly alternative. This review explores the key factors, theories, and mechanisms of Mn species in driving the biogeochemical cycle, and summarizes the application and development trends of Mn redox cycling in water treatment, particularly in simultaneous N and micropollutant removal. Bibliometric analysis identifies research hotspots, gaps, challenges, and future directions for Mn redox-mediated biological N removal. Overall, this review aims to guide the further development and optimization of Mn redox-mediated microbial N removal processes to establish cost-effective N removal techniques for contaminated water.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Margaret Capooci, Rodrigo Vargas
Summary: This study investigated the patterns and drivers of soil CO2 efflux in temperate tidal marshes, finding that soil CO2 efflux is influenced by factors such as air temperature. There were large discrepancies between manual and automated soil CO2 efflux measurements. New technical approaches are needed to accurately estimate the carbon balance in wetland ecosystems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Ecology
Ryan T. Choi, Sasha C. Reed, Colin L. Tucker
Summary: Understanding interactions among biogeochemical cycles is crucial for predicting the responses of dryland ecosystems to changes. This study found that water, carbon, nitrogen, and phosphorus collectively regulate soil carbon cycling in a dryland ecosystem. Water and carbon co-limitation have a significant effect on soil carbon cycling, while nitrogen addition increases soil carbon cycling rates. Phosphorus has no impact on the carbon cycle in this system.
Review
Environmental Sciences
Kristina J. Anderson-Teixeira, Valentine Herrmann, Rebecca Banbury Morgan, Ben Bond-Lamberty, Susan C. Cook-Patton, Abigail E. Ferson, Helene C. Muller-Landau, Maria M. H. Wang
Summary: Forests play a major role in the global carbon cycle, influencing atmospheric CO2 and climate. This study used the Global Forest Carbon Database, ForC, to analyze carbon cycling in forests around the world, finding that carbon cycling rates generally decrease from tropical to temperate to boreal forests, while carbon stocks show less directional variation. Most flux variables and live biomass pools significantly increase with the logarithm of stand age.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Laurence Helene De Clippele, Anna-Selma van der Kaaden, Sandra Rosa Maier, Evert de Froe, J. Murray Roberts
Summary: This study utilized a novel approach to predictively map the distribution of cold-water coral carbonate mounds by combining biological, environmental, and ecosystem function data. The results showed that most of the area is covered by dead coral framework and fine sediments, with dead coral framework contributing significantly to nutrient turnover. The findings suggest that climate-induced changes, local hydrodynamical food supply, and the dissolution of coral framework could have significant implications for the survival and functioning of cold-water coral reefs.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geochemistry & Geophysics
Lucien Stolze, Bhavna Arora, Dipankar Dwivedi, Carl Steefel, Zhi Li, Sergio Carrero, Benjamin Gilbert, Peter Nico, Markus Bill
Summary: The weathering of shale plays a crucial role in the hydrochemical fluxes to river systems and has a significant impact on global biogeochemical cycles. However, there is still a lack of quantitative understanding regarding shale weathering and its influence on these cycles due to the complex interactions between hydrological, biogeochemical, and physical processes. In this study, a novel modeling approach was developed to quantitatively interpret the long-term chemical weathering of shale and its effect on geochemical conditions. The model considers multiple processes involved in shale weathering, including infiltration of meteoric water, mineral-water interactions, microbial oxidation of organic matter, mineral reactions-induced evolution of porosity, and gas exchange between the subsurface and atmosphere.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)