Methanogens, methanotrophs, nitrifiers and denitrifiers are the important microorganisms in the production and consumption of CH4 and N2O in soil. In order to understand the microbial processes related to the two greenhouse gases in paddy soil, the four bacteria groups in phaeozem (Hailun) and burozem (Shenyang) were surveyed during rice growth season by using MPN counting technique. The CH4 and N2O emissions were measured with closed chamber method. Two different water management regimes, i.e., continual irrigation and intermittent irrigation, were used for the two paddy soils. The results of multiple regression analysis showed that there was a significantly positive correlation between CH4 emission and methanogen population in both phaeozem and burozem under two water management regimes. In the soil of Shenyang, there was a significantly positive correlation between CH4 emission and methanotropli population. The N2O emission was significantly correlated to the denitrifier population in both phaeozem and burozem under intermittent irrigation, and in the soil of Shenyang, there was a significantly positive correlation between N2O emission and nitrifier population under two water managements.
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Sci Total Environ
January 2025
State Key Laboratory of Marine Resource Utilization in South China Sea, School of Ecology, School of Marine Science and Engineering, Hainan University, Haikou, Hainan, China; Collaborative Innovation Center of Marine Science and Technology, Hainan University, Haikou, Hainan, China. Electronic address:
The mangrove ecosystems store a significant amount of "blue carbon" to mitigate global climate change, but also serve as hotspots for greenhouse gases (GHGs: CO, CH and NO) production. The CH and NO emissions offset mangrove carbon benefits, however, the extent of this effect remains inadequately quantified. By applying the 36 h time-series observations and mapping cruises, here we investigated the spatial and temporal distribution of GHGs and their fluxes in Dongzhaigang (DZG) bay, the largest mangrove ecosystem in China, at tidal and monthly scales.
View Article and Find Full Text PDFWater Res
January 2025
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, Shandong, China; Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, Shandong, China. Electronic address:
Sulfur-siderite driven autotrophic denitrification (SSAD) has received increasing attention for nutrient removal in constructed wetlands (CWs). Nevertheless, its effectiveness in simultaneous water purification and greenhouse gases (GHGs) reduction remains obscure. In this study, three vertical flow constructed wetlands (VFCWs), filled with quartz sand (CCW), sulfur (S-CW), and sulfur-siderite mixed substrates (SS-CW), were constructed to investigate the underlying mechanisms of SSAD on water purification enhancement and GHGs reduction.
View Article and Find Full Text PDFEnviron Res
January 2025
Department of Environmental and Resource Engineering, Technical University of Denmark, Lyngby DK-2800, Denmark.
Wetlands are important carbon sinks for mitigating climate warming. In this paper, greenhouse gas (GHG) fluxes and carbon sequestration capacity of freshwater wetlands, coastal wetlands and constructed wetlands around the world are evaluated, and strategies to improve carbon sequestration by wetlands are proposed based on the main influencing factors. Air temperature and average annual rainfall are significantly positively correlated with CH flux and NO flux in freshwater wetlands and coastal wetlands.
View Article and Find Full Text PDFEnviron Evid
January 2025
Department of Soil and Environment, Swedish University of Agricultural Sciences, Box 7014, 750 07, Uppsala, Sweden.
Background: To align with climate goals, greenhouse gas (GHG) emissions from agriculture must be reduced significantly. Cultivated peatlands are an important source of such emissions. One proposed measure is to convert arable fields on peatlands to grassland, as the Intergovernmental Panel on Climate Change (IPCC) default emission factors (EF) for organic soils are lower from grasslands.
View Article and Find Full Text PDFSci Total Environ
January 2025
Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia 4072, QLD, Australia.
The role of biochar in reducing greenhouse gas (GHG) emissions and improving soil health is a topic of extensive research, yet its effects remain debated. Conflicting evidence exists regarding biochar's impact on soil microbial-mediated emissions with respect to different GHGs. This study systematically examines these divergent perspectives, aiming to investigate biochar's influence on GHG emissions and soil health in agricultural soils.
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