Article
Environmental Sciences
Hezhong Yuan, Bingchan Jia, Qingfei Zeng, Yanwen Zhou, Juan Wu, Haixiang Wang, Hao Fang, Yiwei Cai, Qiang Li
Summary: This study assessed the impact of dissimilatory nitrate reduction on the phosphorus cycle in lacustrine sediment. The results showed that nitrate reduction facilitated the accumulation of phosphorus in lake water. The synchronous control of nitrogen and phosphorus is crucial for the management and restoration of lake eutrophication.
Article
Biotechnology & Applied Microbiology
Ying Li, Chun-Xian Li, Wei Lin, Shan-Shan Wang, Wen-Xian Zhang, Yong-Mei Jiang, Yong Zhang, Hong Zhang, Yong-He Han
Summary: A new bacterial strain Leclercia adecarboxylata AS3-1 capable of efficient nitrogen removal was isolated in this study, and its nitrogen transformation mechanisms were fully evaluated, providing a new example of diverse nitrogen transformation-regulating systems.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Agricultural Engineering
Xiaodan Zhao, Jie Jiang, Zhen Zhou, Yue Zheng, Yanjun Shao, Yi Zuo, Yuqing Ren, Ying An
Summary: This study investigated the effects of hydraulic retention time of anaerobic side-stream reactors on nitrogen removal in four anoxic/oxic membrane bioreactors. The results showed that upgrading with anaerobic side-stream reactors and carriers can enhance nitrogen removal efficiency by increasing denitrifying bacteria and secondary substrate release. Additionally, metagenomic analysis revealed higher abundances of genes related to nitrogen consumption processes in the upgraded reactors, confirming their pivotal roles in nitrogen metabolism.
BIORESOURCE TECHNOLOGY
(2021)
Article
Ecology
Taylor C. Ledford, Behzad Mortazavi, Corianne Tatariw, Sommer F. Starr, Erin Smyth, Abigail Griffin Wood, Lorae T. Simpson, Julia A. Cherry
Summary: The study shows that wetland construction can help recover plant structure and some ecosystem functions, but the recovery of certain biogeochemical functions may take longer. Although marsh structure can recover relatively quickly after construction, there may be long-term lags in the recovery of ecosystem functions in constructed marshes.
RESTORATION ECOLOGY
(2021)
Article
Chemistry, Physical
Zhiliang Chen, Lihang An, Hang Wei, Jianqiang Zhang, Qi Zou, Mengqiang Sun, Ling Huang, Minchao Liu
Summary: The study found that the addition of nitrate can accelerate the reduction of soil Eh, inhibit dissimilatory iron reduction, and promote arsenic speciation transformation, making it an effective amendment for arsenic immobilization in paddy soils.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Civil
Ya Wu
Summary: High levels of ammonium in the coastal acidic groundwater of Beihai, Southern China pose a threat to surface ecosystems and water supplies. A study was conducted using hydrochemical and isotopic analysis to investigate the occurrence of ammonium and its genesis. The findings suggest that dissimilatory nitrate reduction to ammonium plays a critical role in the enrichment of ammonium concentrations in groundwater.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Environmental
Zhanbiao Yang, Lan Lu, Zhang Cheng, Junren Xian, Yuanxiang Yang, Lixia Liu, Xiaoxun Xu
Summary: The occurrence, contribution, and mechanism of nitrate reduction in urban closed and open lakes are still unclear. An experimental study was conducted in six urban lakes in Chengdu, China, showing that open lakes had higher rates of nitrate reduction compared to closed lakes, and different bacterial communities played distinct roles in nitrate reduction.
Article
Engineering, Environmental
Ruiwen Hu, Songfeng Liu, Weiming Huang, Qiong Nan, P. J. Strong, Muhammad Saleem, Zhengyuan Zhou, Zhiwen Luo, Fangqi Shu, Qingyun Yan, Zhili He, Cheng Wang
Summary: This study combined stable isotope measurements, metagenomics, and metatranscriptomics to verify the occurrence of dissimilatory nitrate reduction to ammonium (DNRA) in the suspended particulate matter (SPM) of the Pearl River Estuary. The study found high abundance and expression of conventional functional genes of DNRA in SPM, contrary to the low potential rate. Through taxonomic and comparative genomic analyses, the study identified diverse bacterial lineages involved in assimilatory nitrate reduction (ANR) in SPM.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ruiwen Hu, Songfeng Liu, Weiming Huang, Qiong Nan, P. J. Strong, Muhammad Saleem, Zhengyuan Zhou, Zhiwen Luo, Fangqi Shu, Qingyun Yan, Zhili He, Cheng Wang
Summary: This study reveals a previously overlooked pathway of dissimilatory nitrate reduction to ammonium (DNRA) mediated by heterotrophic ANR bacteria in suspended particulate matter (SPM) in estuarine ecosystems. Through stable isotope measurements and genomic analyses, it was found that the conventional functional genes of DNRA were abundant and highly expressed in SPM, contradicting the low potential rate. Further analysis identified assimilatory nitrate reduction (ANR) as the main transformation pathway in SPM, with diverse bacteria playing a crucial role.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Soil Science
Yinghui Jiang, Guoyu Yin, Lijun Hou, Min Liu, Dengzhou Gao, Zongxiao Zhang, Yanling Zheng, Ping Han
Summary: Conversion of coastal wetland to paddy soil can significantly increase dissimilatory nitrate reduction rates, with denitrification being the dominant pathway. However, more reactive nitrogen may be exported in paddy soil due to intensive N fertilizer application and increased nitrification and ammonification rates, leading to stimulated N2O emission along reclamation chronosequences. This study provides valuable insights into the mechanisms of reclamation influences on soil nitrogen cycling.
SOIL & TILLAGE RESEARCH
(2021)
Article
Environmental Sciences
Dan Wang, Peiyue Li, Dawei Mu, Weichao Liu, Yinfu Chen, Misbah Fida
Summary: This study investigates the biogeochemical processes of nitrate in the vadose zone-groundwater system using hydrogeochemistry, stable isotopes, and microbial techniques. The results indicate that nitrate concentration is influenced by plant root absorption, assimilation, and nitrification processes. Denitrification mainly occurs in the 60-80 cm soil layer. The microbial community structure is affected by soil sampling depths and groundwater nitrate concentrations. The study provides important insights for understanding and managing groundwater nitrogen in agricultural areas.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
R. Kyle Derby, Brian A. Needelman, Ana A. Roden, J. Patrick Megonigal
Summary: Direct measurement of methane emissions is expensive for greenhouse gas offset projects, leading to the development of alternative accounting methods such as proxies. This study found that different plant and hydrological conditions significantly influence methane emissions in wetland communities, suggesting that these factors can be used as proxies to estimate methane emissions.
Article
Agricultural Engineering
Yiwu Wang, Qunliang Li
Summary: This study investigated the competition between denitrification and dissimilatory nitrate reduction to ammonium (DNRA) for nitrite in composting of sugarcane pith and cow manure. Metagenomic analysis revealed that Actinobacteria was the dominant DNRA microorganism. The abundances of denitrification and DNRA functional genes showed different trends during the heating, thermophilic, cooling, and maturity phases, with some genes decreasing and others increasing in abundance. Mantel test and network analysis identified key microorganisms and their driving factors affecting DNRA and nitrogen management in the composting ecosystems.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Yuecheng She, Xin Qi, Xiaodong Xin, Yanqing He, Wei Wang, Zhengkui Li
Summary: Microbial mechanisms play a crucial role in nitrate reduction in sediments of aquaculture ponds, with denitrification being the dominant process. The activities and composition of microbial communities in aquaculture ponds are influenced by the availability of carbon and nitrogen substrates, while autotrophic denitrifiers control the microbial network in natural freshwater sediments.
ENVIRONMENTAL RESEARCH
(2023)
Article
Soil Science
Yuxuan Wan, Qing Du, Yue Wu, Ruixiang Li, Xuejun Yan, Nan Li, Xin Wang
Summary: Large amounts of nitrogen fertilized to food production are lost via denitrification and leaching. Dissimilatory nitrate reduction to ammonium (DNRA) is a bioprocess competing with denitrification, and it conserves bioavailable nitrogen in soil ecosystems. Our results found a sustainable way of nitrogen retention in soils, and have broader implications for understanding nitrogen turnover in ecosystems.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Soil Science
Yinghui Jiang, Guoyu Yin, Ye Li, Lijun Hou, Min Liu, Cheng Chen, Dongsheng Zheng, Han Wu, Dengzhou Gao, Yanling Zheng, Ping Han
Summary: The study investigates the effects of salinity on nitrogen transformation processes and N2O emission rates. The results show that saltwater incursion can increase the contribution of heterotrophic denitrification to N2O emission, and under high salinity, nitrification-coupled denitrification becomes the dominant pathway of N2O emission.
BIOLOGY AND FERTILITY OF SOILS
(2023)
Article
Engineering, Environmental
Bolin Liu, Lijun Hou, Yanling Zheng, Zongxiao Zhang, Xiufeng Tang, Tieqiang Mao, Jinzhou Du, Qianqian Bi, Hongpo Dong, Guoyu Yin, Ping Han, Xia Liang, Min Liu
Summary: The study reveals that the rate of dark carbon fixation in intertidal sediments is closely related to the availability of reductive substrates and the sulfide content in sediments. Bacteria harboring the cbbM gene play a dominant role in dark carbon fixation, primarily belonging to the Burkholderia genus. Furthermore, these chemoautotrophic microorganisms may play important roles in the coupled carbon, nitrogen, and sulfur cycles.
Article
Soil Science
Zhirui An, Yanling Zheng, Lijun Hou, Dengzhou Gao, Feiyang Chen, Jie Zhou, Bolin Liu, Li Wu, Lin Qi, Guoyu Yin, Min Liu
Summary: This study reveals the effects of crab bioturbation on N2O emissions in coastal wetlands and their underlying molecular mechanisms. The presence of crabs significantly increases N2O emissions, positively correlated with the intensity of crab bioturbation. Hydroxylamine oxidation and bacterial denitrification are the dominant pathways for N2O production, and changes in microbial communities may drive the increase in N2O emissions in crab-disturbed habitats.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Engineering, Environmental
Cheng Chen, Jiongyu Pan, Shuxin Xiao, Jiayi Wang, Xiaoluo Gong, Guoyu Yin, Lijun Hou, Min Liu, Yanling Zheng
Summary: Both traditional petroleum-based and emerging biodegradable microplastics promote N2O production in sediment, but the pathways vary. Biodegradable polylactic acid (PLA) microplastics have a greater promotion of N2O production compared to petroleum-based polyvinyl chloride (PVC) and polyethylene (PE), with PLA promoting it through nitrifier nitrification and heterotrophic denitrification, PE through nitrifier denitrification and heterotrophic denitrification, and PVC through nitrifier nitrification. Different nitrogen cycling microbes' response to microplastics leads to the differences in N2O increase pathways, with nitrifying bacteria significantly enriched in all microplastic treatments, while part of denitrifying bacteria significantly enriched in treatments containing PLA and PE microplastics.
Article
Engineering, Environmental
Cheng Chen, Ye Li, Guoyu Yin, Lijun Hou, Min Liu, Yinghui Jiang, Dongsheng Zheng, Han Wu, Yanling Zheng, Dongyao Sun
Summary: This study investigated the impacts of sulfamethoxazole on N2O production pathways in estuarine sediments using N-15-O-18 labeling technique and molecular methods. The results showed that sulfamethoxazole promoted the contribution of nitrifier denitrification to total N2O production. Furthermore, different concentrations of sulfamethoxazole had varying effects on the dominance of nitrification denitrification, heterotrophic denitrification, and nitrifier nitrification in N2O production.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Dengzhou Gao, Cheng Liu, Xiaofei Li, Yanling Zheng, Hongpo Dong, Xia Liang, Yuhui Niu, Guoyu Yin, Min Liu, Lijun Hou
Summary: The coupling between nitrification and denitrification/anammox plays a significant role in periodically low-oxygen estuaries and coasts, but the dynamics of this process are not well understood. In this study, experiments were conducted in the Yangtze Estuary to investigate the changes in denitrification and anammox under low-oxygen conditions. The results showed that denitrification increased while anammox decreased during low-oxygen summer. Low oxygen also promoted the coupling of nitrification-denitrification but decreased nitrification-anammox coupling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Soil Science
Shuntao Chen, Dengzhou Gao, Jinbo Zhang, Christoph Muller, Xiaofei Li, Yanling Zheng, Hongpo Dong, Guoyu Yin, Ping Han, Xia Liang, Min Liu, Lijun Hou
Summary: Saltmarsh plants play a crucial role in regulating nitrogen dynamics in estuarine and coastal wetlands. They enhance the availability of ammonium (NH4+) for plant uptake while reducing NH4+ immobilization and autotrophic nitrification rates. The invasive plant Spartina alterniflora has a greater impact on soil nitrogen transformations compared to the native Phragmites australis. The findings provide valuable insights into the ecological management of invasive plants in estuarine and coastal ecosystems.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Soil Science
Dongyao Sun, Xiufeng Tang, Jun Li, Min Liu, Lijun Hou, Guoyu Yin, Cheng Chen, Qiang Zhao, Uli Klumper, Ping Han
Summary: The study evaluated the impact and specificity of various specific nitrification inhibitors on comammox Nitrospira in pure and mixed cultures. It was found that chlorate specifically inhibited the ammonia and nitrite oxidation activity of comammox Nitrospira, allowing for the quantification of comammox activity in wetlands and providing insights into the ecological roles of comammox bacteria in coastal environments.
SOIL BIOLOGY & BIOCHEMISTRY
(2022)
Article
Soil Science
Shuntao Chen, Dengzhou Gao, Jinbo Zhang, Yanling Zheng, Xiaofei Li, Hongpo Dong, Guoyu Yin, Ping Han, Xia Liang, Min Liu, Christoph Mueller, Lijun Hou
Summary: This study investigated the spatial changes in gross nitrogen transformation rates and related functional gene abundances in the intertidal zone of the Yangtze Estuary. The results suggest that gross nitrogen transformation rates vary significantly in estuarine and intertidal wetlands, with higher rates observed in freshwater and low-salinity areas. Sedimentary total organic carbon, nitrite, ferrous iron, and microbial functional gene abundances jointly mediate the gross nitrogen transformations. This research provides a better understanding of nitrogen cycling and management strategies in estuarine and coastal environments.
Article
Engineering, Environmental
Ye Li, Ye Huang, Lina Yuan, Yue He, Guoyu Yin, Tianhao He, Erkai He, Fangfang Ding, Haibin Xia, Haoran Xu, Min Liu, Shu Tao
Summary: The deposition of PAHs has significant impacts on Earth's surface system and human health. However, the understanding of PAHs' deposition in highly urbanized areas is limited due to data limitations and low resolution of current models. This research establishes a deposition map of PAHs in Shanghai, China, with a resolution of 2 x 2 km. The results show that the downtown area of Shanghai has the highest PAHs deposition, which is 4.3 times higher than that in the outlying areas. Wet deposition dominates in Shanghai, accounting for 77% of the area and 62% of the total deposition. The deposition of PAHs follows a seasonal trend of summer>fall>spring>winter, similar to rainfall patterns. Built-up land and human activities are identified as key driving factors of PAHs' deposition in Shanghai.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Feiyang Chen, Yuhui Niu, Zhirui An, Li Wu, Jie Zhou, Lin Qi, Guoyu Yin, Hongpo Dong, Xiaofei Li, Dengzhou Gao, Min Liu, Yanling Zheng, Lijun Hou
Summary: Tidal-induced shifts of n-DAMO activity and associated contribution to mitigating CH4 in intertidal wetlands were studied. The study found that the wetting-drying events caused by tidal cycling had significant effects on the abundance and activity of n-DAMO microbial communities. The presence of n-DAMO bacteria and archaea and their higher biodiversity under reflooded conditions were also observed. Structural equation modeling and correlation analysis indicated that n-DAMO activity was influenced by microbial abundance, substrate availability, and salt accumulation in sediment. This study provides valuable insights into accurately estimating CH4 emissions from intertidal wetlands under different tidal scenarios.
Article
Geosciences, Multidisciplinary
Shuntao Chen, Dengzhou Gao, Xiaofei Li, Dongyao Sun, Yanling Zheng, Hongpo Dong, Xia Liang, Guoyu Yin, Ping Han, Min Liu, Lijun Hou
Summary: This study assessed the potential activity of nitrate and ferric iron reduction and microbial diversity in coastal wetlands of China. The results showed higher activity in subtropical regions compared to temperate regions, with sediment characteristics and geographical factors having an indirect effect on the process.
Article
Soil Science
Bin Wang, Xianbiao Lin
Summary: The wide and rapid invasion of Spartina alterniflora threatens the sustainability of coastal wetlands in China and negatively impacts sediment biogeochemical processes. This study investigated the effects of this invasive species on sediment nitrate reduction processes in mangrove wetlands. The results showed significant spatial differences in denitrification, dissimilatory nitrate reduction to ammonium, and their contributions among different plant communities. Spartina alterniflora invasion increased sediment nitrogen loss while reducing nitrogen retention in mangrove wetlands, posing a threat to their buffer function and nitrogen pools protection in estuarine and coastal ecosystems.
Article
Biodiversity Conservation
Lin Qi, Yanling Zheng, Lijun Hou, Bolin Liu, Jie Zhou, Zhirui An, Li Wu, Feiyang Chen, Zhuke Lin, Guoyu Yin, Hongpo Dong, Xiaofei Li, Xia Liang, Min Liu
Summary: The study investigates the effect of temperature on the activity of chemoautotrophs in estuarine and coastal waters. The findings show that the response of dark carbon fixation (DCF) to temperature varies, with offshore sites being more vulnerable to global warming. The study also reveals the dominant pathways of chemoautotrophic carbon fixation in different areas, highlighting the importance of incorporating DCF thermal response into biogeochemical models.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Engineering, Environmental
Xiaoli Zhang, Cheng Yao, Bosong Zhang, Wenwen Tan, Jun Gong, Guang-yu Wang, Jianmin Zhao, Xianbiao Lin
Summary: Intensive mariculture activities can lead to eutrophication and coastal deoxygenation. This study investigated the role of sediment nitrate reduction pathways and microbial communities in seasonal deoxygenation in a coastal aquaculture zone. The results showed that denitrification was the dominant nitrate reduction process, and both denitrification and dissimilatory nitrate reduction to ammonium were enhanced during summer deoxygenation. The abundance of the nitrous oxide reductase gene nosZ increased during deoxygenation, with Azospirillum and Ruegeria being the main contributors. Effective management measures are needed to prevent further exacerbation of coastal deoxygenation and maintain sustainable mariculture.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)