Article
Environmental Sciences
Huawei Li, Shaoxuan Ding, Wanchao Song, Xiaoyan Wang, Jincheng Ding, Jie Lu
Summary: This study found that the coexisting humic acid can enhance the reduction of iron and dissolution of goethite, as well as accelerate the generation of hydroxyl radicals in the redox process. By constructing an iron-reducing bacteria-HA-Fe(II)/Fe(III) reaction system, organic contaminants in black and odorous water can be effectively decomposed.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Yang Ding, Qianting Ye, Minqin Liu, Zhenqing Shi, Yuzhen Liang
Summary: The properties and composition of soil dissolved organic matter (DOM) are heavily influenced by the adsorption and desorption of organic matter (OM) on soil minerals and heterotrophic microbial respiration. Organic acids, like oxalic acid, have been shown to release organic matter (OM) and stimulate microbial degradation by dissolving protective mineral phases. This study found that oxalic acid induced long-lasting impacts on soil DOM properties and composition, enhancing the degradation of certain organic compounds while increasing the accumulation of others, under anoxic soil conditions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Lelde Krumina, Michiel op de Beeck, Viktoriia Meklesh, Anders Tunlid, Per Persson
Summary: Recent studies have shown that decomposition of dissolved organic matter by ectomycorrhizal fungi enhances the adsorptive properties of organic matter towards soil mineral surfaces. Additionally, the iron-reduction induced by ECM fungus Paxillus involutus during organic matter decomposition plays a significant role in non-enzymatic Fenton-based decomposition of DOM. The results suggest that organic matter associated with ferrihydrite may be more susceptible to radical oxidation compared to goethite.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Environmental
Yanting Zhang, Na Zhang, Ao Qian, Chenglong Yu, Peng Zhang, Songhu Yuan
Summary: This study reveals the significant influence of the C/Fe molar ratio on the production of hydrogen peroxide and hydroxyl radical during the oxygenation of reduced iron and natural organic matter in the subsurface. The accumulation of hydroxyl radical increases more prominently with the increase in the C/Fe ratio.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Soil Science
Angelika Kolbl, Klaus Kaiser, Aaron Thompson, Luke Mosley, Rob Fitzpatrick, Petra Marschner, Leopold Sauheitl, Robert Mikutta
Summary: This study tested the potential of wheat straw-derived dissolved organic carbon (DOC) for remediation of sandy sulfuric soil. The results showed that addition of wheat straw-derived DOC can induce reduction reactions and rapidly increase soil pH under submerged conditions. This method has the potential for rapid and sustainable remediation of sandy sulfuric subsoils.
Article
Engineering, Environmental
Chenglong Yu, Yuxi Lu, Yanting Zhang, Ao Qian, Peng Zhang, Man Tong, Songhu Yuan
Summary: This study investigated the production of hydroxyl radicals (.OH) from solid humic acid during oxidation. The results demonstrated that solid humic acid transferred electrons to oxygen, leading to the generation of .OH. The modeling results also confirmed that reduced solid organic matter played a significant role in .OH production.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Geochemistry & Geophysics
Wei Xiu, Wenjie Yuan, David A. Polya, Huaming Guo, Jonathan R. Lloyd
Summary: The study revealed a range of gamma and k' values in both natural and synthesized Fe(III) (oxyhydr)oxides, crucial for providing a proxy for abiotic Fe(III) reduction kinetics. Microbial parameters significantly influence the microbial Fe(III) reduction kinetics in addition to the heterogeneity in Fe(III) (oxyhydr)oxides, emphasizing the importance of microbial reactivities in better modeling the biogeochemical cycles of Fe(III) (oxyhydr)oxides as well as the fate of contaminants solubility in global terrestrial and aquatic ecosystems.
APPLIED GEOCHEMISTRY
(2021)
Article
Geochemistry & Geophysics
Fan Jiang, Chipeng Zhang, Kaixuan Zhang, Huan Luo, Jianglan Luo, Fengzhu Liu
Summary: In this study, ascorbic acid and fulvic acid were used as additives to enhance the mobility of arsenic in electrokinetic remediation (EKR) of arsenic-contaminated soil. Both ascorbic acid (EK-AA) and its combination with fulvic acid (EK-AF) increased soil water content and conductivity, creating more reducing conditions and enhancing the reduction and removal of iron, especially in the EK-AF treatment. After 14 days of EKR, the arsenic removal efficiency in EK-AF treatment reached 29.1%, while the control group was only 5.5%. The study demonstrated that ascorbic and fulvic acids can be ideal green additives to improve arsenic and co-existing heavy metals removal in EKR.
APPLIED GEOCHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Shanshan Yang, Xiao Ge, Yanzhang Li, Hongrui Ding, Yan Li, Changqiu Wang, Anhuai Lu
Summary: This study explored the complex interactions between dissolved organic matters (DOM) and iron oxides, and their influence on carbon and iron cycling in soil. The results revealed that the accumulation of Fe-(aq)(2+) at the DOM-goethite interface under irradiation, along with the generation of reactive oxidative species (ROS), played a crucial role in driving the coupling process of iron redox cycle and oxidative decomposition of DOM.
Review
Environmental Sciences
Qi Li, Weifang Hu, Linfeng Li, Yichun Li
Summary: This paper reviews the research on Fe-OC content in different environments and describes the mechanisms and processes of OM transformation dynamics at mineral-organic interfaces. Recent studies emphasize the diverse interactions between Fe oxides and OC, with organic compounds adhering to Fe oxides.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Rachel M. Wilson, Moira A. Hough, Brittany A. Verbeke, Suzanne B. Hodgkins, Jeff P. Chanton, Scott D. Saleska, Virginia Rich, Malak M. Tfaily, Gene Tyson, Matthew B. Sullivan, Eoin Brodie, William J. Riley, Ben Woodcroft, Carmody McCalley, Sky C. Dominguez, Patrick M. Crill, Ruth K. Varner, Steve Frolking, William T. Cooper
Summary: This study investigates the relationship between plant tissue chemistry and soil organic matter (SOM) in an Arctic peatland, and its impact on carbon emissions. The results show that the quality of organic matter differs between different plant species and is influenced by vegetation shifts and moisture levels. The findings highlight the importance of vegetation changes in peatlands in controlling carbon emissions under climate change.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Youru Yao, Kang Ma, Shiyin Li, Yong Zhang, Zhiming Zhang, Fengman Fang, Yuesheng Lin, Li Yin, Lian Sun, Chonghong Zhang
Summary: The phenomenon of algal blooms resulting from lake eutrophication can increase the concentration of dissolved organic matter (DOM) and affect the behavior of arsenic (As) in the environment. In this study, the levels of DOM, As, Fe, and Mn in the Chaohu Lake Basin were investigated, and the interaction mechanism between DOM-Fe/Mn and As was examined in a controlled laboratory environment. The results showed that the concentrations of Fe and Mn can influence the transformation of As species, with DOM acting as a connector between DOM and As.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2024)
Article
Engineering, Environmental
Andreas Fritzsche, Julian Bosch, Michael Sander, Christian Schroder, James M. Byrne, Thomas Ritschel, Prachi Joshi, Markus Maisch, Rainer U. Meckenstock, Andreas Kappler, Kai U. Totsche
Summary: In redoximorphic soils, microbial reduction of iron (III) minerals is significantly influenced by organic matter, which can either decelerate or accelerate the reduction rate. The organic matter released by microbial activity under anaerobic conditions (efOM) plays a key role in affecting the electron uptake and crystallinity of iron (III) minerals. The presence of efOM, whether adsorbed or coprecipitated, leads to distinct effects on microbial reduction of iron (III) minerals by affecting the surface passivation and altering the mineral structure.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jiaxin Lv, Ruixin Chen, Zhen Wu, Yang Bai, Han Song, Chen Tian, Mengye Wang, Zhang Lin
Summary: The enrichment of microplastics in polar ice is a common phenomenon. Therefore, studying the degradation behavior of microplastics in frozen environments is important in evaluating their impact on polar ecosystems. This study investigated the degradation of polystyrene (PS) in frozen anoxic Fe(ii)-containing solutions, revealing a 14.6-fold higher degradation rate compared to water. The study provides insights into an overlooked pathway for microplastic degradation in frozen environments, which is crucial for understanding their environmental behavior.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Chemistry, Multidisciplinary
Phoomipat Jungcharoen, Mathieu Pedrot, Frank Heberling, Khalil Hanna, Fadi Choueikani, Charlotte Catrouillet, Aline Dia, Remi Marsac
Summary: Magnetite nanoparticles are interesting due to their electronic, magnetic and chemical properties. Previous studies have shown that partial oxidation of magnetite nanoparticles can occur, but these transformations were only monitored under oxidizing or acidic conditions. This study found that 10 nm-sized stoichiometric magnetite particles are not stable in aqueous solutions over a biologically and environmentally relevant pH range. A thermodynamic model was developed to predict the chemical stability of these nanoparticles.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Soil Science
Yue Cai, Tian Ma, Yiyun Wang, Juan Jia, Yufu Jia, Chao Liang, Xiaojuan Feng
Summary: The accumulation of microbial necromass relative to labile organic carbon consumption is influenced by various factors including soil mineral content and composition. Clay promotes microbial respiration and enhances amino sugar accumulation efficiency, while ferrihydrite increases microbial respiration rate but decreases amino sugar accumulation efficiency.
Article
Geochemistry & Geophysics
Jingjing Guo, Tian Ma, Nana Liu, Xinying Zhang, Huifeng Hu, Wenhong Ma, Zhiheng Wang, Xiaojuan Feng, Francien Peterse
Summary: Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane lipids of certain soil bacteria and can be used to proxy air temperature and soil pH. This study evaluated the influence of soil pH and aridity on brGDGT distributions in grassland soils in Inner Mongolia. The relative abundance of 6-methyl brGDGTs increased with increasing soil pH and aridity, suggesting that soil pH reconstructions based on this compound may be more reliable. Additionally, different bacterial community compositions responded differently to aridity, indicating the complex factors influencing brGDGT production.
ORGANIC GEOCHEMISTRY
(2022)
Article
Plant Sciences
Yuqing Liu, Qiaodong Chi, Hui Cheng, Huanxin Ding, Teng Wen, Jun Zhao, Xiaojuan Feng, Jinbo Zhang, Zucong Cai, Guohua Liu
Summary: This study investigated the abundance and distribution of nitrogen functional genes (NFGs) in different soil layers in grassland habitats in northern China. The results showed that the distribution of NFGs was influenced by soil depth and grassland habitats, with vertical differences having a greater impact. Furthermore, redundancy analysis indicated that soil resource supply may control the vertical distribution of these microorganisms.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Soil Science
Guohua Dai, Shanshan Zhu, Yue Cai, Erxiong Zhu, Yufu Jia, Chengjun Ji, Zhiyao Tang, Jingyun Fang, Xiaojuan Feng
Summary: Plant and microbial residues are the main sources of soil organic carbon (SOC). This study found that forests have lower microbial necromass in SOC compared to grasslands, indicating a higher contribution of plant-derived components to forest SOC. Plant-derived lignin phenols do not play a major role in SOC accumulation, while leaf- and root-derived hydrolysable lipids make up a higher proportion of SOC in forests. Soil pH, reactive iron and aluminum contents, and lignin oxidation are factors that influence the accumulation of plant lipids and SOC in forest soils.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Biodiversity Conservation
Laura Castaneda-Gomez, Kate Lajtha, Richard Bowden, Fathima Nahidha Mohammed Jauhar, Juan Jia, Xiaojuan Feng, Myrna J. Simpson
Summary: Forest ecosystems as global soil carbon reservoirs are affected by climate change factors that change carbon inputs. This study integrated molecular composition data sets of soil organic matter and microbial communities to investigate the effects of detrital input and removal treatments on forest soil carbon dynamics. The results showed that long-term litter additions did not increase soil carbon content, while litter reductions negatively impacted soil carbon concentrations. This highlights the sensitivity of soil carbon biogeochemistry to changes in litter deposition.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Soil Science
Yufu Jia, Zongguang Liu, Lei Zhou, Xiaojuan Liu, Keping Ma, Xiaojuan Feng
Summary: Soil organic carbon (SOC) is important for ecosystem carbon sequestration and climate change mitigation, but its sourcing and regulating mechanisms in the rhizosphere remain poorly understood. This study collected rhizosphere and non-rhizosphere soils under different mycorrhizal tree species and assessed potential mechanisms influencing the distribution of plant and microbial residues. The results showed that rhizosphere SOC had higher concentrations of lignin phenols and amino sugars, especially under ectomycorrhizal trees. These findings highlight differences in and controls on rhizosphere SOC sourcing related to different mycorrhizal tree species.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Soil Science
Yue Cai, Xiaojuan Feng
Summary: Microbial necromass accrual via anabolism is an important process contributing to the formation and accumulation of stable soil organic C (SOC). Both substrates and microbial community traits impact the rate and efficiency of microbial biomass production, yet their effects on necromass accumulation patterns and efficiency remain unclear.
BIOLOGY AND FERTILITY OF SOILS
(2023)
Article
Soil Science
Ya Wang, Simin Wang, Chengzhu Liu, Erxiong Zhu, Juan Jia, Xiaojuan Feng
Summary: The relationship between soil organic matter (SOM) diversity and soil organic carbon (SOC) persistence is understudied in high-SOC soils such as wetlands. This study investigated shifts in SOM diversity after drainage in three wetland sites of varying SOC concentrations. The results showed that SOM diversity had a non-linear relationship with SOC concentration, with low-SOC wetlands exhibiting an increase in SOM diversity after drainage, while high-SOC wetlands did not show any change. Factors such as plant inputs and microbial processing influenced SOM diversity in high-SOC wetlands. These findings provide new insights into wetland SOC stability in the context of drainage.
Article
Environmental Sciences
Hongyan Bao, Ying Wu, Xiaoqian Zhan, Xiaona Wang, Robert G. M. Spencer, Peter J. J. Hernes, Xiaojuan Feng, Li-Chin Lee, Jr-Chuan Huang, Jingjing Zhang, Hongwei Zhao, Shuh-Ji Kao, Jing Zhang
Summary: The concentrations of dissolved lignin and dissolved organic carbon (DOC) were positively correlated globally, and were influenced by water discharge, mean basin slope, and forest coverage. The estimated global flux of dissolved lignin ranged from 0.58 to 1.2 Tg yr(-1), suggesting a significant impact of future land-cover changes on the land-to-ocean export of dissolved organic matter.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Biodiversity Conservation
Xiaojuan Feng, Simin Wang
Summary: Microbe-mediated carbon transformation is crucial for soil carbon sequestration, serving as a key strategy for long-term carbon neutrality. Evaluating the efficiency of microbial necromass accumulation in relation to plant carbon input or microbial respiration can provide insights into promoting soil carbon sequestration from an ecosystem perspective.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Multidisciplinary Sciences
Yunpeng Zhao, Chengzhu Liu, Xingqi Li, Lixiao Ma, Guoqing Zhai, Xiaojuan Feng
Summary: Sphagnum wetlands are important for carbon storage, as they accumulate decay-resistant litter and mineral-associated organic carbon (MAOC). This study found that Sphagnum promotes the accumulation of metal-bound OC through the activation of iron and aluminum oxides in the soil. The unique metabolites of Sphagnum further enhance metal-organic associations, leading to the dominance of metal-bound OC in soil MAOC. These findings demonstrate that Sphagnum acts as an efficient 'rust engineer' that boosts the rusty carbon sink in wetlands.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Environmental Sciences
Marguerite A. Xenopoulos, Ben Bond-Lamberty, Deborah Huntzinger, Ankur R. Desai, Xiaojuan Feng, William M. Hammond, David J. P. Moore, Xuefeng Peng, Dork Sahagian, Cristina Santin, Rodrigo Vargas, Naomi S. Wells, Paige Wooden
Summary: We have committed to improving the inclusion of underrepresented members in our community in the publication pipeline of JGR: Biogeosciences. Our commitment includes regular updates on policies, concrete actions, and efforts to tackle biases and promote equitable research. Progress has been made in diversifying our editorial teams, increasing awareness of unconscious bias in peer-review, and fostering inclusion in global collaborations. Our update highlights gender disparities in manuscript submissions and decisions, and presents a pilot program to address ethical and equitable collaborations in resource-poor settings. Next steps include a thorough analysis of reviewer demographics.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Erxiong Zhu, Zongguang Liu, Simin Wang, Yiyun Wang, Ting Liu, Xiaojuan Feng
Summary: The binding of organic carbon (OC) to minerals is crucial for the persistence of soil organic carbon (SOC), which is necessary for long-term sequestration of atmospheric carbon dioxide into soils. However, the relative importance of metal oxides and silicate clay in SOC protection remains unclear, limiting our ability to predict and protect this important reservoir of persistent SOC.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Review
Environmental Sciences
Huai Chen, Peijun Ju, Qiuan Zhu, Xingliang Xu, Ning Wu, Yongheng Gao, Xiaojuan Feng, Jianqing Tian, Shuli Niu, Yangjian Zhang, Changhui Peng, Yanfen Wang
Summary: The carbon and nitrogen cycling on the Qinghai-Tibetan Plateau has been influenced by atmospheric warming, cryosphere thaw, and intensified human activities. Despite the complexity of these changes, they largely offset each other. The plateau is predicted to continue functioning as a net carbon sink in the future, despite severe permafrost degradation, while nitrogen stocks are expected to remain relatively stable.
NATURE REVIEWS EARTH & ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
