Article
Environmental Sciences
Antonio Castellano-Hinojosa, Eulogio J. Bedmar, Juan M. Medina-Sanchez
Summary: High-mountain lakes and rivers in Mediterranean ecosystems are influenced by atmospheric transport processes and receive reactive nitrogen (Nr) mainly in the form of nitrate (NO3-) through wet deposition. Bacterial denitrifiers are responsible for the reduction of NO3- to N2O and N-2, while nitrifiers can also contribute to NO3- and N2O production. Factors controlling Nr removal in aquatic ecosystems at different altitudes and seasons are uncertain. This study examined Nr removal efficiency in a high-mountain lake and its downwater river, finding that efficiency increased with altitude and varied over the ice-free period. Abundance of archaeal nitrifiers and bacterial denitrifiers controlled total Nr removal, while abiotic and biotic factors affected clean Nr removal efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Chaobiao Meng, Yating Xing, Yu Ding, Qichun Zhang, Hongjie Di, Caixian Tang, Jianming Xu, Yong Li
Summary: Soil acidification globally impacts soil nitrogen transformation, but its effects on net N mineralization, nitrification, and N2O emissions remain unclear. This study found that soil acidification significantly reduced net N mineralization, net nitrification, and N2O emissions, with the strongest effects observed in soils with pH 5.5. The decrease in net nitrification was attributed to limited N availability and reduced abundance of nitrifying microbes, while the decrease in N2O emissions resulted from suppressed nitrification and denitrification processes and limited N availability. These findings enhance our understanding of soil acidification's effects on N cycling and provide guidance for sustainable N management and N2O mitigation in acid soils.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Soil Science
Yulong Shi, Xingren Liu, Qingwen Zhang, Yingchun Li
Summary: This study found that biochar significantly reduced N2O emissions in both maize and wheat seasons, while organic fertilizer significantly increased N2O emissions in the maize season. Soil pH, NO3- -N content, and water-filled pore space were key factors influencing the community compositions of nitrifiers and denitrifiers.
APPLIED SOIL ECOLOGY
(2022)
Article
Agronomy
Ziwei Wang, Shuoran Liu, Yunze Ruan, Qing Wang, Zhijun Zhang
Summary: The use of biochar and lime can effectively mitigate soil acidification and reduce N2O emissions. The biochar and lime treatments reduced N2O emissions by 49.69% and 63.01% respectively, while increasing CO2 emissions by 27.51% and 19.35% respectively. Additionally, the treatments also altered the microbial composition in the soil, decreasing the abundance of certain ammonia-oxidizing bacteria while increasing the abundance of others.
Article
Engineering, Environmental
Cheng Chen, Guoyu Yin, Qiuxuan Li, Youran Gu, Dongyao Sun, Soonmo An, Xia Liang, Xiaofei Li, Yanling Zheng, Lijun Hou, Min Liu
Summary: Global estuarine and coastal zones are facing severe microplastics pollution. A study found that microplastics have different spatial response patterns on the interactions between sulfate reducers and denitrifiers, as well as denitrification and associated N2O emissions. The findings provide important insights into the impacts of microplastics on the nitrogen cycle in estuarine and coastal zones.
Article
Agronomy
Ziyi Feng, Yongxiang Yu, Huaiying Yao, Chaorong Ge
Summary: This study found that the presence of ZnO nanoparticles can increase N2O emissions in soil, especially when coupled with C and N substrate amendments. The action of ZnO NPs promotes nitrification and denitrification processes, further impacting the functional genes associated with N2O emissions.
Article
Environmental Sciences
Hu Li, Xiao-Ru Yang, Juan Wang, Guo-Wei Zhou, Yu-Sen Zhang, Simon Bo Lassen, Yong-Guan Zhu, Jian-Qiang Su
Summary: Soil fauna play an important role in nutrient cycling in terrestrial ecosystems. This study investigated the activity and community of anammox bacteria in earthworm guts and soils, finding that anammox rates in guts were significantly higher than in surrounding soils, while abundances of hzsB genes in guts were lower than in soils. Earthworms were shown to reduce anammox and denitrification-associated N loss by altering the community compositions of anammox bacteria in soils.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Forestry
Yajing Wang, Wenchao Cao, Jingheng Guo, Minghu Zhang
Summary: Increasing soil pH can suppress N2O emissions from denitrification and highlight the potential importance of abiotic denitrification on N2O emissions.
Article
Environmental Sciences
Yongxing Lu, Ye Tao, Benfeng Yin, Yonggang Li, Colin Tucker, Xiaobing Zhou, Yuanming Zhang
Summary: Dryland ecosystems are often nitrogen-limited, and small nitrogen inputs can have significant effects on nitrogen emissions. This study investigated the impact of increased anthropogenic nitrogen deposition in desert ecosystems during non-growing seasons. Results showed that nitrogen addition significantly affected N2O emissions and increased the abundances of key functional genes for nitrogen cycle. However, the effect on NO emissions was minimal. The composition of biological soil crusts played a crucial role in determining the effects of nitrogen addition on N2O emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ting Lan, Mengxiao Li, Xiaoqian He, Junji Yuan, Minghua Zhou, Xiaoyan Tang, Yanyan Zhang, Yang Li, Zhaonan Tian, Xuesong Gao
Summary: Exogenous carbon and nitrification inhibitors are commonly used to regulate soil nitrogen cycling and mitigate greenhouse gas emissions, but their direct effects on denitrification processes are not well understood.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Microbiology
Jiajin Song, Tongxin Li, Zhiruo Zheng, Wenjie Fu, Zhengnan Long, Nan Shi, Yuling Han, Luqing Zhang, Yunlong Yu, Hua Fang
Summary: CBD residues have significant effects on the gut microbiome and resistome in earthworms, leading to increased abundance and diversity of antibiotic resistance genes. This enhancement effect is attributed to the stress on the gut microbiome caused by CBD and facilitated dissemination of resistance genes through mobile genetic elements.
Article
Soil Science
Alessandra Santos, Marcus Vinicius Cremonesi, Josileia Acordi Zanatta, Luis Cunha, Harold L. Drake, George Gardner Brown
Summary: Research has shown significant differences in the chemical and microbial environments between earthworm casts and non-ingested control soil, despite minimal variations in CO2, N2O, and CH4 emissions. The moist and NH4-rich environment within earthworm casts provides ideal conditions for sustained anaerobic activity, affecting nitrogen transformations, soil microbial biomass, and activity. Additionally, selective ingestion concentrates C and N contents in the casts, impacting nutrient availability and deserving further attention in light of widespread collection of this species for fish-bait use in Brazil.
BIOLOGY AND FERTILITY OF SOILS
(2021)
Article
Microbiology
Setor Kwami Fudjoe, Lingling Li, Yuji Jiang, Abdul-Rauf Malimanga Alhassan, Junhong Xie, Sumera Anwar, Linlin Wang, Lihua Xie
Summary: This study evaluated the effects of organic fertilization treatments on denitrifying communities and N2O emissions in the semi-arid Loess Plateau. The results showed that organic fertilization treatments significantly increased the abundance and diversity of denitrifiers, particularly nirS-harboring denitrifiers, and modified the community structure. These findings highlight the ecological importance of denitrifying communities in mediating denitrification potentials and the stimulatory impact of organic fertilization treatments on nitrogen dynamics.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Agronomy
Jinmei Zhong, Yaqi Song, Man Yang, Wei Wang, Zhaohua Li, Liya Zhao, Kun Li, Ling Wang
Summary: Paddy fields are significant sources of N2O emissions due to frequent fluctuations in soil water content. The contribution of N2O uptake to the reduction in net N2O emission varies with water content and is influenced by physicochemical factors and microbial regulatory mechanisms. However, the specific impact of these factors on N2O uptake in paddy soil remains largely unknown.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Agronomy
Jong-Mun Lee, Do-Gyun Park, Seong-Su Kang, Eun-Jung Choi, Hyo-Suk Gwon, Hyoung-Seok Lee, Sun-Il Lee
Summary: This study evaluated the effects of biochar application on soil organic carbon improvement and greenhouse gas reduction in different soil characteristics. The results showed that biochar application significantly increased soil organic carbon in all soils, with the highest rate of increase in poor soil. Barley straw biochar effectively reduced N2O emissions, while poultry manure biochar improved SOC and reduced N2O emissions in poor soil.
