Article
Green & Sustainable Science & Technology
Dejuan Jiang, Zhi Li, Yun Xia, Yuan Li, Yongming Luo
Summary: The combined effects of damming and drought have significant impacts on water cycle dynamics and nitrogen biogeochemical cycles in rivers. Dams can promote the removal of nitrogen, while droughts exacerbate the effects of dams and elevate the nitrogen level.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Agronomy
Iwona Beata Pasmionka, Karol Bulski, Elzbieta Boliglowa
Summary: The article discusses the importance of enhancing natural biological processes and protecting the environment, with a focus on the microbiological aspect of nitrogen transformation. It aims to provide insights on historical findings, recent advancements, nitrogen uptake dynamics, the relationship between nitrogen microorganisms and plant nitrogen uptake, and the use of microbiological biostimulants.
Article
Environmental Sciences
Bin Zhao, Peng Yao, Dong Li, Zhigang Yu
Summary: River damming and the construction of the Three Gorges Dam have significantly impacted the distribution and burial of organic carbon in the coastal areas of the Changjiang River Delta, leading to reductions and redistribution of organic carbon. As global climate change and human activities continue to affect these processes, further research and consideration of these carbon burial hotspots in global carbon models is necessary.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Mariel Barjau-Aguilar, Martin Merino-Ibarra, Jorge A. Ramirez-Zierold, Sergio F. Castillo-Sandoval, Gloria Vilaclara-Fatjo, Andrea P. Guzman-Arias, Miroslav Macek, Rocio J. Alcantara-Hernandez, Salvador Sanchez-Carrillo, Patricia M. Valdespino-Castillo, Arantxa Sacristan-Ramirez, Jose G. Quintanilla-Terminel, Emiliano Monroy-Rios, Julio Diaz-Valenzuela, Julio A. Lestayo-Gonzalez, Oscar A. Gerardo-Nieto, Roberto Gonzalez-De Zayas
Summary: Nitrogen and phosphorous loading drive eutrophication in aquatic systems. The Valle de Bravo reservoir in Mexico acts as a net sink for nitrogen and phosphorous, mainly through sedimentation. Long-term mass balances are useful in assessing biogeochemical dynamics and variability.
Article
Environmental Sciences
Gongqin Wang, Xinghui Xia, Shaoda Liu, Junfeng Wang, Sibo Zhang
Summary: In urban inland waters in Beijing, rivers and lakes mainly act as sinks for N-2, with low carbon-to-nitrogen ratios hindering N-2 production during denitrification, while low nitrogen-to-phosphorus ratios potentially favor N-2 fixation. The study indicates that urban rivers emit negligible N into the atmosphere, contrary to the traditional paradigm of constant N loss via denitrification.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Agricultural Engineering
Yite Huang, Hongxiang Yang, Kecheng Li, Qingran Meng, Susu Wang, Yiwu Wang, Pengfei Zhu, Qiuqi Niu, Hailong Yan, Xiaolan Li, Qunliang Li
Summary: The study found that adding red mud can increase the retention of NH4+-N and NO3--N in composting, improve compost quality by inhibiting denitrification and enhancing nitrogen fixation. Adding red mud reduces nitrogen loss and enhances compost quality.
BIORESOURCE TECHNOLOGY
(2022)
Article
Geology
Wei Wei, Yongchao Lu, Yiquan Ma, Jingyu Zhang, Huyue Song, Lin Chen, Huiming Liu, Shoupeng Zhang
Summary: Nitrogen isotopes have been studied in the Bohai Bay Basin to understand the paleoenvironmental factors affecting sedimentary conditions. The results suggest a correlation between nitrogen isotopic signals and ancient salinity changes, potentially related to marine transgression events and stratification of the water column.
SEDIMENTARY GEOLOGY
(2021)
Review
Green & Sustainable Science & Technology
Donna Davys, Francis Rayns, Susanne Charlesworth, Robert Lillywhite
Summary: This paper reviews the potential of biochar to improve soil properties and mitigate climate change, and explores the influence of different biochar characteristics on different stages of the nitrogen cycle. After adding biochar to soil, it causes changes in microbial biomass and diversity, soil properties, and other parameters, which have significant effects on plant growth.
Article
Green & Sustainable Science & Technology
Junnan Ding, Bin Li, Minglong Sun, Xin Li
Summary: This study aimed to explore the effects of three different cropping patterns on the abundance of nitrogen-cycling genes in saline-alkali soils. The results showed that rotation and mixture promoted soil nutrients and significantly influenced N-cycling functional genes. Rotation reduced the abundance of nifH, AOA, narG, and nosZ, while increasing the abundance of AOB. Mixture decreased the abundance of AOA, narG, and nosZ, while increasing the abundance of AOB and nxrB. Rotation and mixture not only reduced soil salinity but also improved soil fertility and nitrogen cycling.
Article
Microbiology
Ugo Marzocchi, Stefano Bonaglia, Anastasija Zaiko, Grazia M. Quero, Irma Vybernaite-Lubiene, Tobia Politi, Aurelija Samuiloviene, Mindaugas Zilius, Marco Bartoli, Ulisse Cardini
Summary: The study reveals that zebra mussels significantly enhance nitrogen cycling to the water column in the shallow sediment of the lagoon through the release of ammonium and stimulation of DNRA, as well as exhibiting a unique N2 fixation capacity associated with the mussel's holobiont.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Environmental Sciences
Beryl Kahn, Alyson Lowell, Flynn DeLany, Jessica MacGregor, Bradley Peterson, Chester Zarnoch
Summary: Dissolved carbon dioxide (CO2) in seawater can disrupt microbial nutrient cycles, impacting hot spots of nutrient cycling such as eelgrass (Zostera marina) beds. Acidification increases denitrification dominance and decreases nitrogen (N) fixation. Under acidified conditions with nitrogen-enriched treatments, eelgrass beds may serve as sinks rather than sources of N.
Article
Engineering, Geological
Peng Zeng, Sheng Wang, Xiaoping Sun, Xuanmei Fan, Tianbin Li, Dongpo Wang, Bing Feng, Xing Zhu
Summary: This study proposed a probabilistic framework to predict rockslide-induced river damming, calibrating input parameters through sequential Bayesian back analysis to predict the probability of river damming and produce a hazard zonation map of the barrier lake.
ENGINEERING GEOLOGY
(2022)
Article
Ecology
Tobia Politi, Ruta Bariseviciute, Marco Bartoli, Stefano Bonaglia, Ulisse Cardini, Giuseppe Castaldelli, Akvile Kancauskaite, Ugo Marzocchi, Jolita Petkuviene, Aurelija Samuiloviene, Irma Vybernaite-Lubiene, Anastasija Zaiko, Mindaugas Zilius
Summary: The study found that tube-dwelling chironomid larvae play a multifaceted role in shaping the nitrogen cycle in aquatic ecosystems, with significant impacts on denitrification processes. The larvae contribute to nitrate reduction primarily through denitrification, with additional effects from dinitrogen fixation, highlighting the versatility of their microbial community. Detection of nitrogen-cycling marker genes in flying adults suggests that chironomids retain nitrogen-cycling microbes during metamorphosis and migration to terrestrial ecosystems.
FRESHWATER BIOLOGY
(2021)
Article
Ecology
R. S. Fulford, K. Houghton, J. James, M. Russell
Summary: Estuaries play a vital role in providing ecosystem services, but they are facing increasing stress from human activities. This study focuses on the interaction between the management priorities of limiting eutrophication and restoring submerged aquatic vegetation (SAV) in estuaries. The research examines the contribution of SAV to nitrogen cycling and compares nitrogen cycling between SAV and bare sediment habitats in a coastal estuary. The findings highlight the importance of habitat type in nitrogen cycling, particularly near the river mouth where sediment nitrogen levels are higher.
Article
Geosciences, Multidisciplinary
Zun Yin, Catherine Ottle, Philippe Ciais, Feng Zhou, Xuhui Wang, Polcher Jan, Patrice Dumas, Shushi Peng, Laurent Li, Xudong Zhou, Yan Bo, Yi Xi, Shilong Piao
Summary: This study successfully simulated the streamflow of the Yellow River using a mechanistic global land surface model and quantified the impacts of irrigation and dam operation on streamflow fluctuations. The findings suggest that irrigation significantly reduces river streamflows, while dam operation has a greater impact on streamflow seasonality.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
C. B. Brinkerhoff, P. A. Raymond, T. Maavara, Y. Ishitsuka, K. S. Aho, C. J. Gleason
Summary: Lakes are key components of the inland water system and play a significant role in the degassing of soil CO2. The ability of lakes to evade CO2 is influenced by factors such as size and residence time, which in turn affect downstream CO2 transport.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Michelle E. Newcomer, Nicholas J. Bouskill, Haruko Wainwright, Taylor Maavara, Bhavna Arora, Erica R. Siirila-Woodburn, Dipankar Dwivedi, Kenneth H. Williams, Carl Steefel, Susan S. Hubbard
Summary: The patterns of watershed nitrogen retention and loss are influenced by various factors including atmospheric deposition, vegetation trends, and stream trends. The study identified two patterns of watershed nitrogen retention and loss, a hysteresis pattern and a one-way transition to a new state. Regions with increasing atmospheric deposition and vegetation health patterns have higher nitrogen retention capacity and experience declines in stream nitrogen exports.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Multidisciplinary Sciences
Taylor Maavara, Erica R. Siirila-Woodburn, Fadji Maina, Reed M. Maxwell, James E. Sample, K. Dana Chadwick, Rosemary Carroll, Michelle E. Newcomer, Wenming Dong, Kenneth H. Williams, Carl Steefel, Nicholas J. Bouskill
Summary: There is a growing understanding of the role of bedrock weathering as a nitrogen source in various environmental systems, especially in mountainous regions. However, the relative contributions of rock-derived nitrogen to nitrogen supply in mountainous watersheds are not well understood. The study developed a suite of models to quantify the sources, transformations, and sinks of geogenic and atmospheric nitrogen in a mountain watershed.
Correction
Geosciences, Multidisciplinary
Maodian Liu, Qianru Zhang, Taylor Maavara, Shaoda Liu, Xuejun Wang, Peter A. Raymond
Article
Geosciences, Multidisciplinary
Maodian Liu, Qianru Zhang, Taylor Maavara, Shaoda Liu, Xuejun Wang, Peter A. Raymond
Summary: Rivers transport a significant amount of mercury annually to coastal oceans, three times more than atmospheric deposition. High flow events play a significant role in mercury export, with coastal oceans receiving the majority of external mercury input. Rivers are identified as the largest source of mercury to coastal oceans worldwide.
Article
Environmental Sciences
Taylor Maavara, Laura Logozzo, Aron Stubbins, Kelly Aho, Craig Brinkerhoff, Jacob Hosen, Peter Raymond
Summary: The study focuses on the photomineralization of dissolved organic carbon (DOC) in temperate rivers, specifically in the Connecticut River Watershed (CRW). Results show that photomineralization is a minor sink for DOC in temperate rivers, with varied rates across different flow conditions and seasons, but overall negligible compared to DOC fluxes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geosciences, Multidisciplinary
R. Xu, H. Tian, N. Pan, R. L. Thompson, J. G. Canadell, E. A. Davidson, C. Nevison, W. Winiwarter, H. Shi, S. Pan, J. Chang, P. Ciais, S. R. S. Dangal, A. Ito, R. B. Jackson, F. Joos, R. Lauerwald, S. Lienert, T. Maavara, D. B. Millet, P. A. Raymond, P. Regnier, F. N. Tubiello, N. Vuichard, K. C. Wells, C. Wilson, J. Yang, Y. Yao, S. Zaehle, F. Zhou
Summary: We synthesized 17 bottom-up and 5 top-down estimates of N2O emissions over North America, finding a slight increase in emissions due to U.S. agriculture. Anthropogenic emissions were twice as large as natural fluxes, with the U.S. contributing the most. Agricultural emissions in the U.S. closely matched EPA inventory results, while Canada and Mexico had higher agricultural emissions than their national inventories.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Shaoda Liu, Taylor Maavara, Craig B. Brinkerhoff, Peter A. Raymond
Summary: The capacity of watersheds to eliminate or export reactive constituents has significant implications for aquatic ecosystem ecology and biogeochemistry. This study characterized the Damkohler number (Da) for dissolved organic carbon (DOC) uptake in global river networks. The results showed that watershed size is a primary controlling factor for river network DOC uptake, and tropical river networks have higher DOC uptake capacity compared to temperate and Arctic river networks. Additionally, river damming has a profound impact on DOC uptake, particularly in temperate watersheds.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Editorial Material
Environmental Sciences
Shaoda Liu, Taylor Maavara, Xiankun Yang, Lee E. Brown
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Limnology
Taylor Maavara, Craig Brinkerhoff, Jacob Hosen, Kelly Aho, Laura Logozzo, James Saiers, Aron Stubbins, Peter Raymond
Summary: River networks play an important role in transporting dissolved organic carbon (DOC) from land to the coastal ocean. The uptake of DOC in a river network is influenced by factors such as stream order, seasonal conditions, and flow. However, the dominance of biological or abiotic processes in DOC uptake and the partitioning of uptake between lakes and rivers are still unclear. In this study, a new model named CUPS-OF-DOC is presented to quantify DOC cycling in a river network, taking into account river-lake connectivity. The model is applied to the Connecticut River Watershed, revealing that the proportion of DOC uptake from photomineralization varies across different flow conditions and stream orders.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Review
Multidisciplinary Sciences
Tom J. Battin, Ronny Lauerwald, Emily S. Bernhardt, Enrico Bertuzzo, Lluis Gomez Gener, Robert O. Hall Jr, Erin R. Hotchkiss, Taylor Maavara, Tamlin M. Pavelsky, Lishan Ran, Peter Raymond, Judith A. Rosentreter, Pierre Regnier
Summary: River networks are the largest biogeochemical connection between land, ocean and atmosphere. Our understanding of the role of rivers in the global carbon cycle is limited, making it difficult to predict how global change will affect riverine carbon sequestration and greenhouse gas emissions. This review summarizes the current state of river ecosystem metabolism research and provides estimates of carbon flux from land to rivers. The study highlights the importance of a global river observing system in understanding river networks and their future evolution in the context of the global carbon budget.
Review
Environmental Sciences
Ronny Lauerwald, George H. Allen, Bridget R. Deemer, Shaoda Liu, Taylor Maavara, Peter Raymond, Lewis Alcott, David Bastviken, Adam Hastie, Meredith A. Holgerson, Matthew S. Johnson, Bernhard Lehner, Peirong Lin, Alessandra Marzadri, Lishan Ran, Hanqin Tian, Xiao Yang, Yuanzhi Yao, Pierre Regnier
Summary: This study reviews the progress made in estimating greenhouse gas (GHG) emissions from inland waters over the past decade, highlighting the remaining challenges and uncertainties. More empirical work is needed to reduce these uncertainties, particularly in understanding the contributions of specific areas and moments to overall GHG emissions.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Engineering, Civil
Wenqing Shi, Taylor Maavara, Qiuwen Chen, Jianyun Zhang, Jinren Ni, Daniele Tonina
Summary: This study investigated the greenhouse gas (GHG) emissions in a cascade hydropower system in the upper Mekong River, China. The results showed that GHG emissions were higher in cascade reservoirs compared to the upstream channel due to accumulated sediments. CO2 was the largest contributor to total CO2-eq, while N2O had a minimal contribution. The most upstream reservoir emitted the most CH4, possibly due to sediment accumulation.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Judith A. Rosentreter, Goulven G. Laruelle, Hermann W. Bange, Thomas S. Bianchi, Julius J. M. Busecke, Wei-Jun Cai, Bradley D. Eyre, Inke Forbrich, Eun Young Kwon, Taylor Maavara, Nils Moosdorf, Raymond G. Najjar, V. V. S. S. Sarma, Bryce Van Dam, Pierre Regnier
Summary: This article analyzes data from 738 observation sites and finds that coastal ecosystems have a certain absorption effect on greenhouse gases in the atmosphere, but methane and nitrous oxide emissions counteract the absorption of carbon dioxide. Southeast Asia, North America, and Africa are identified as hotspots for coastal greenhouse gas absorption.
NATURE CLIMATE CHANGE
(2023)
Article
Green & Sustainable Science & Technology
Tariq Aziz, Alain-Desire Nimubona, Philippe Van Cappellen
Summary: Economic valuations of ecosystem services often rely on transferring global unit values to the local context, but the reliability of this approach depends on the representativeness of the large-scale average unit values. This study compared local, regional, and global unit values to estimate the values of water filtration, nutrient cycling, and carbon sequestration in the Grand River watershed. The results showed that the global database provided significantly higher monetary values for ecosystem services compared to local and regional estimates. The research highlights the importance of critically assessing the origin of unit values and land cover resolution in ecosystem services valuation.
