Article
Engineering, Environmental
Derrick R. Vaughn, Anne M. Kellerman, Kimberly P. Wickland, Robert G. Striegl, David C. Podgorski, Jon R. Hawkings, Jaap H. Nienhuis, Mark M. Dornblaser, Edward G. Stets, Robert G. M. Spencer
Summary: Anthropogenic conversion of forests and wetlands to agricultural and urban landcovers impacts dissolved organic matter (DOM) within streams draining these catchments, but research on how it affects DOM molecular composition and bioavailability is lacking. In a study of the Upper Mississippi River Basin, it was found that streams draining urban areas had higher bioavailable DOC (BDOC) concentrations compared to streams draining agricultural and forested areas. The conversion of forested landcover to urban had a greater impact on stream DOM bioavailability than conversion to agricultural landcover.
Article
Environmental Sciences
Su -Huai Chang, Xu-Guang Huang, Li -Ping Jia, Xiao-Huang Chen, Ling-chuan Fang, Zhen-Hong Wang, Shun -Xing Li, Feng-Jiao Liu
Summary: This study investigated the effects of urea, nickel, and dissolved organic matter (DOM) from different sources on the offshore ecosystem. It found that the composition of DOM significantly influenced the bioavailability and toxicity of nickel, which in turn affected the dynamics of phytoplankton.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Environmental Sciences
Yanwen Huang, Yao Du, Teng Ma, Yamin Deng, Yanqiu Tao, Yu Xu, Zhichao Leng
Summary: High levels of ammonium in groundwater can pose a potential threat to drinking water security and ecosystem health. This study investigated the role of dissolved organic matter (DOM) in mobilizing natural ammonium in groundwater, revealing that groundwater with higher ammonium levels had DOM characterized by larger molecular weight in a more reductive environment, while groundwater with lower ammonium levels had DOM with smaller molecular weight in a more oxidative condition.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Hongyan Bao, Jing Qiao, Dekun Huang, Jutta Niggemann, Yuanbi Yi, Weiqiang Zhao, Silin Ni, Thorsten Dittmar, Shuh-Ji Kao
Summary: The biolability of rainwater dissolved organic matter (DOM) at the molecular level has been examined for the first time in this study. Results showed that approximately 50% of rainwater DOC and around 90% of formic acid (FA) and acetic acid (AA) were bioconsumed within 28 days. Additionally, our findings revealed the quantitative and qualitative understanding of the bioavailability of rainwater DOM, which is crucial for comprehending their impact on biogeochemical cycles and environmental health in receiving waters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Ashley A. Coble, Adam S. Wymore, Jody D. Potter, William H. McDowell
Summary: Anthropogenic land use has altered the character and bioavailability of dissolved organic matter (DOM). This study found that land use has a greater influence than stream order on the variability of DOM characteristics and bioavailability throughout the year. Watersheds with less aromatic and more recently produced DOM, as well as more development and impervious surface, have greater bioavailability.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yijun Yang, Qian Wang, Jiangkai Xue, Shuhang Tian, Yao Du, Xianjun Xie, Yiqun Gan, Yamin Deng, Yanxin Wang
Summary: By comparing the optical properties and molecular compositions of dissolved organic matter (DOM) with hydrochemical and isotopic data in two floodplain aquifer systems along the middle reaches of Yangtze River, it was found that the concentration of arsenic (As) in groundwater is mainly associated with terrestrial humic-like components. Molecular signatures indicate that high As groundwater has lower H/C ratios but greater DBE, AImod, and NOSC values. The relative abundance of CHON3 formulas gradually decreases with the increase of groundwater As concentration, while that of CHON2 and CHON1 increases, demonstrating the importance of N-containing organics in As mobility.
Article
Environmental Sciences
Chao Wang, Xuanyu Hu, Yilin Liu, Guangzhe Jin
Summary: Groundwater discharge and river runoff are important pathways for allochthonous dissolved organic matter (DOM) to enter the South China Sea. The source, composition, and efflux of DOM from these sources remains poorly understood. This study conducted analysis along the coast of western Guangdong and found that groundwater DOM mainly originates from microbial activities, while river water DOM has a considerable contribution from terrestrial soil. The findings emphasize the importance of considering groundwater discharge and river runoff in coastal carbon budgets.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Agricultural Engineering
Dingmei Wang, Liwen Mai, Zhen Yu, Kongtan Wang, Ze Meng, Xiongfei Wang, Qinfen Li, Jiacong Lin, Dongming Wu
Summary: Previous studies on compost dissolved organic matter (DOM) have mainly focused on its composition and humification, neglecting the importance of DOM bioavailability in understanding compost fertility. This study investigated the bioavailability of DOM in thermophilic compost (TC) and vermicompost (VC), and linked it to its molecular composition. It was found that the bioavailability of VC DOM (36% BDOC) was generally higher than that of TC (22% BDOC) due to higher content of tannin-like substances. Furthermore, the differences in bioavailability between VC and TC increased as the C/N ratio decreased in the composting materials.
BIORESOURCE TECHNOLOGY
(2024)
Article
Environmental Sciences
Gwilym A. V. Price, Jenny L. Stauber, Dianne F. Jolley, Darren J. Koppel, Eric J. Van Genderen, Adam C. Ryan, Aleicia Holland
Summary: This study investigated the influence of dissolved organic matter (DOM) concentration, source, and water pH on the chronic toxicity of zinc to a freshwater microalga. The results showed that the toxicity of zinc was influenced by both the concentration and source of DOM, and could be increased by the presence of certain DOM components.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Shuiyuan He, Tingting Liu, Chunli Kang, Honghai Xue, Siyang Sun, Shuyi Yu
Summary: This research focused on the characteristics and effects of dissolved organic matter (DOM) in untreated livestock manure. By studying fresh chicken manure from a large-scale chicken farm, it was found that photodegradation can reduce the aromaticity and humus content of DOM, while increasing the proportion of medium and/or small molecular weight components. Additionally, the binding ability of DOM with Cu2+ and Zn2+ in water solution decreased significantly after photodegradation.
Article
Environmental Sciences
Angela Hansen, Tamara Kraus, Matthew Landon, Peter Mcmahon
Summary: This study analyzed dissolved organic carbon concentration and optical spectroscopic techniques (absorbance and fluorescence) of oil-field water and groundwater samples in southern California. The results showed significantly higher DOC concentrations in oil-field water compared to native groundwater samples. Multivariate statistical analysis identified 10 optical properties that were significant in distinguishing water categories. Principal component analysis demonstrated the ability to successfully differentiate oil-field water samples from native groundwater mixed with oil-field water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Kai Xiao, Peng Zhang, Isaac R. Santos, Jun-Jian Wang, Zhenyang Li, Xuejing Wang, Ying-Hui Wang, Meiqing Lu, Licong Zhang, Hailong Li
Summary: Dissolved organic matter (DOM) in highly productive intertidal mangroves plays a significant role as a carbon and nutrient source in the coastal ocean. The influence of groundwater flow on DOM properties and fluxes remains poorly understood. This study highlights the importance of tidal hydrology in controlling groundwater DOM characteristics.
WATER RESOURCES RESEARCH
(2023)
Review
Environmental Sciences
Adeleh Aftabtalab, Joerg Rinklebe, Sabry M. Shaheen, Nabeel Khan Niazi, Eduardo Moreno-Jimenez, Joerg Schaller, Klaus-Holger Knorr
Summary: High concentrations of arsenic in groundwater are primarily influenced by arsenic-rich sediments underground. Various processes drive the mobilization of arsenic in aquatic ecosystems, with dissolved arsenic exhibiting high affinity for dissolved organic matter. Understanding the complex interactions and biogeochemical cycling of arsenic, dissolved organic matter, and iron oxides is essential for preventing arsenic contamination spread in aquatic resources.
Article
Engineering, Civil
Yanqiu Tao, Yao Du, Yamin Deng, Teng Ma, Yanxin Wang
Summary: This study reveals that phosphorus-containing dissolved organic matter (DOM) is an important factor controlling groundwater phosphorus enrichment. Through the degradation of DOM, an accumulation and retention process of phosphorus is observed at the molecular level, eventually becoming the predominant phosphorus pool in groundwater.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Zhou Liang, Robert T. Letscher, Angela N. Knapp
Summary: Surface ocean bulk and semi-labile dissolved organic matter (DOM) stoichiometry vary across ocean regions with global means of 387:26:1 and 179:20:1, respectively. Surface ocean DOC:DOP and DON:DOP concentration ratios are more variable than DOC:DON concentration ratios. Surface ocean gradients in P-depleted DOM stoichiometries in the Pacific and Atlantic basins reflect variable nutrient stress.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Oceanography
Matthew A. Charette, Lauren E. Kipp, Laramie T. Jensen, Jessica S. Dabrowski, Laura M. Whitmore, Jessica N. Fitzsimmons, Tatiana Williford, Adam Ulfsbo, Elizabeth Jones, Randelle M. Bundy, Sebastian M. Vivancos, Katharina Pahnke, Seth G. John, Yang Xiang, Mariko Hatta, Mariia Petrova, LarsEric Heimburger-Boavida, Dorothea Bauch, Robert Newton, Angelica Pasqualini, Alison M. Agather, Rainer M. W. Amon, Robert F. Anderson, Per S. Andersson, Ronald Benner, Katlin L. Bowman, R. Lawrence Edwards, Sandra Gdaniec, Loes J. A. Gerringa, Aridane G. Gonzalez, Mats Granskog, Brian Haley, Chad R. Hammerschmidt, Dennis A. Hansell, Paul B. Henderson, David C. Kadko, Karl Kaiser, Patrick Laan, Phoebe J. Lam, Carl H. Lamborg, Martin Levier, Xianglei Li, Andrew R. Margolin, Chris Measures, Rob Middag, Frank J. Millero, Willard S. Moore, Ronja Paffrath, Hlne Planquette, Benjamin Rabe, Heather Reader, Robert Rember, Micha J. A. Rijkenberg, Matthieu Roy-Barman, Michiel Rutgers van der Loeff, Mak Saito, Ursula Schauer, Peter Schlosser, Robert M. Sherrell, Alan M. Shiller, Hans Slagter, Jeroen E. Sonke, Colin Stedmon, Ryan J. Woosley, Ole Valk, Jan van Ooijen, Ruifeng Zhang
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2020)
Article
Limnology
Qiang Zheng, Wenxin Lin, Yu Wang, Yunyun Li, Chen He, Yuan Shen, Weidong Guo, Quan Shi, Nianzhi Jiao
Summary: Phytoplankton are major contributors of labile dissolved organic matter to marine euphotic zone ecosystems. Viral-mediated phytoplankton lysis releases a considerable amount of bioavailable cellular contents and facilitates localized heterotrophic bacterial growth. The study showed that viral lysis promoted the transformation ofSynechococcusbiomass to dissolved organic matter, and the organic molecules from relatively high molecular weight to low molecular weight, corresponding to variation in their bioavailability. TheSynechococcus-derived organic matter was highly enriched in N-containing organic molecules, and oligopeptides, nucleotides, and lipid compounds significantly increased with viral lysis.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Limnology
Richard LaBrie, Simon Belanger, Ronald Benner, Roxane Maranger
Summary: This study utilizes empirical data and SpAD modeling to investigate the relationships among DOM compounds, metabolic processes, and prokaryotic diversity. Different SpAD taxonomic groups were found to be associated with specific organic compounds and metabolic rates. The study proposes a framework to bridge the gap between prokaryotic diversity, microbial ecology, and biogeochemistry across scales.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Geochemistry & Geophysics
Yuan Shen, Thomas P. Guilderson, Owen A. Sherwood, Carmen G. Castro, Francisco P. Chavez, Matthew D. McCarthy
Summary: Recent research on compound-specific stable isotopes of amino acids in proteinaceous deep-sea corals has opened up a new realm of high-fidelity reconstruction for biogeochemical and ecological changes in the ocean. By testing fundamental assumptions underlying these applications, it was found that baseline-proxy AA isotope values are fixed at the base of food webs and remain unaltered during subsequent export and incorporation from particles into corals. The study demonstrates for the first time that CSI-AA in proteinaceous deep-sea corals can accurately reconstruct known bulk delta N-15 values of export production, source nitrogen delta N-15 values, and exported TPCSI-AA values.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Limnology
Yuan Shen, Ronald Benner
Summary: Recent bioassay experiments suggest that the microbial utilization of dissolved organic matter in the ocean is primarily regulated by molecular properties. However, a modeling study conducted by Lennartz and Dittmar challenges this finding, proposing that concentration-driven uptake may largely explain the observed results. We argue that their models are insufficient to establish the relative roles of molecular properties and concentration-driven uptake.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Chemistry, Multidisciplinary
Hope L. Ianiri, Yuan Shen, Taylor A. B. Broek, Matthew D. McCarthy
Summary: This study compares the distribution and degradation state of amino acids (AA) with different molecular weights in the ocean, and suggests that high molecular weight (HMW) and low molecular weight (LMW) AA have independent bacterial sources and degradation mechanisms. Although some indices in HMW and LMW material show conflicting results, the overall findings support the idea that AA dissolved organic nitrogen (DON) sources in the ocean are more diverse than previously believed, with a majority of them derived from non-proteinaceous material.
Article
Microbiology
Yu Wang, Rui Xie, Yuan Shen, Ruanhong Cai, Chen He, Qi Chen, Weidong Guo, Quan Shi, Nianzhi Jiao, Qiang Zheng
Summary: This study investigated the interactions between phytoplankton-derived dissolved organic matter (DOM) and heterotrophic prokaryotes at the molecular level. The findings revealed the importance and mechanisms of these interactions in the marine elemental cycle.
MICROBIOLOGY SPECTRUM
(2022)
Article
Oceanography
Tatiana Williford, Rainer M. W. Amon, Karl Kaiser, Ronald Benner, Colin Stedmon, Dorothea Bauch, Jessica N. Fitzsimmons, Loes J. A. Gerringa, Robert Newton, Dennis A. Hansell, Mats A. Granskog, Laramie Jensen, Luis M. Laglera, Angelica Pasqualini, Benjamin Rabe, Heather Reader, Michiel Rutgers van der Loeff, Ge Yan
Summary: This study investigates the distribution of dissolved organic matter (DOM) and its impact on the distribution of trace elements in different water masses of the Arctic Ocean. The findings suggest that DOM fluorescence closely follows the isopycnals, indicating the influence of sea-ice formation and melt on DOM distribution. Terrigenous and marine DOM components are carriers of dissolved Fe, Ni, and Cu from the Eurasian shelves into the central Arctic Ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Yuan Shen, Thomas P. Guilderson, Francisco P. Chavez, Matthew D. McCarthy
Summary: Photosynthesis in the surface ocean converts atmospheric CO2 into organic particles, which sink to depth as part of the ocean's biological pump. Previous studies indicated minimal replacement of plankton-derived particles by bacterial material during sinking. However, our research using bacteria-specific biomarkers reveals widespread accumulation of bacterial material in sinking particles. Bacterial detritus accounts for a significant proportion of the particulate organic carbon and nitrogen, exceeding cell count-based estimates. The contribution of bacteria to the biological pump increases with decreasing export production and is expected to rise with ocean warming.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Jinqiang Guo, Yuan Shen, Huamao Yuan, Jinming Song, Xuegang Li, Liqin Duan, Ning Li
Summary: Concentrations of particulate organic carbon (POC) and total hydrolyzable amino sugars (THAS) were measured along a transect in the South Yellow Sea (SYS) to study the reactivity and bacterial reworking of particulate organic matter (POM). The results showed that POM bioavailability was linked to primary production, as evidenced by the correlation between chlorophyll-a concentrations and the diagenetic indicator glucosamine/galactosamine (GlcN/GalN). Bacterial transformation of POM varied with productivity, and the extensive bacterial alteration of POM in the water column may enhance long-term carbon sequestration.
ORGANIC GEOCHEMISTRY
(2023)
Article
Geosciences, Multidisciplinary
Shicong Xiao, Jiaxin Chen, Yuan Shen, Qi Chen, Yu Wang, Yunyun Li, Chen He, Ruanhong Cai, Quan Shi, Nianzhi Jiao, Qiang Zheng
Summary: Dissolved organic matter (DOM) in the ocean is a significant carbon pool, and microbial metabolism plays a crucial role in shaping the marine DOM pool. However, the molecular characteristics of DOM under anoxic/hypoxic conditions are not well-studied. This study investigated the changes in microbial community responses and molecular characteristics of DOM during microbial-mediated transformation under hypoxic conditions. The results showed decreased microbial activity, inhibited growth of aerobic bacteria, and changes in DOM composition under low oxygen conditions.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Ecology
Allison N. N. Myers-Pigg, Karl Kaiser, Ronald Benner, Susan E. E. Ziegler
Summary: The fate of soil organic carbon in boreal forests depends on the ecosystem response to climate change. It is unclear how climate change affects the net effect of nitrogen cycling and primary productivity on soil organic carbon reservoirs. The diagenetic state of soil organic carbon is a useful indicator of the net response to climate change. A study conducted in boreal forests shows that the diagenetic state of soil organic carbon remains constant across different climate zones, suggesting the role of coupled soil carbon and nitrogen cycling in maintaining soil organic carbon stocks.
Article
Geosciences, Multidisciplinary
Philippe Massicotte, Rainer M. W. Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Belanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaelle Chaillou, Malik Chami, Bruno Charriere, Jing Chen, Herve Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Jens Ehn, Cedric Fichot, Marie-Helene Forget, Pingqing Fu, Jonathan Gagnon, Nicole Garcia, Beat Gasser, Jean-Francois Ghiglione, Gaby Gorsky, Michel Gosselin, Priscillia Gourvil, Yves Gratton, Pascal Guillot, Hermann J. Heipieper, Serge Heussner, Stanford B. Hooker, Yannick Huot, Christian Jeanthon, Wade Jeffrey, Fabien Joux, Kimitaka Kawamura, Bruno Lansard, Edouard Leymarie, Heike Link, Connie Lovejoy, Claudie Marec, Dominique Marie, Johannie Martin, Jacobo Martin, Guillaume Masse, Atsushi Matsuoka, Vanessa McKague, Alexandre Mignot, William L. Miller, Juan-Carlos Miquel, Alfonso Mucci, Kaori Ono, Eva Ortega-Retuerta, Christos Panagiotopoulos, Tim Papakyriakou, Marc Picheral, Louis Prieur, Patrick Raimbault, Josephine Ras, Rick A. Reynolds, Andre Rochon, Jean-Francois Rontani, Catherine Schmechtig, Sabine Schmidt, Richard Sempere, Yuan Shen, Guisheng Song, Dariusz Stramski, Eri Tachibana, Alexandre Thirouard, Imma Tolosa, Jean-Eric Tremblay, Mickael Vaitilingom, Daniel Vaulot, Frederic Vaultier, John K. Volkman, Huixiang Xie, Guangming Zheng, Marcel Babin
Summary: The MALINA oceanographic campaign in 2009 aimed to investigate carbon stocks and fluxes in the Mackenzie River estuary and Beaufort Sea, collecting a range of physical, chemical, and biological variables across seven transects. Data standardization and compilation efforts have been made to facilitate further studies on the changing Arctic Ocean.
EARTH SYSTEM SCIENCE DATA
(2021)