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3 Schematic illustration of N transformation (nitrification and denitrification) pathway and nitrous oxide production processes in soil
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Greenhouse gas (GHG) emission from agriculture contributes significantly to the global climate change. The major greenhouse gases emitted from agriculture are methane (CH4) and nitrous oxide (N2O). These two greenhouse gases have higher global warming potential than carbon dioxide (CO2). The manuscript embodies biogeochemical cycling of CH4 and N2O...
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Reservoirs are hotspots of greenhouse gas (GHG) emission, and the global warming potential of nitrous oxide (N2O) is higher than that of CO2 and CH4. To promote our understanding of the relationship of biotic and abiotic environments with the mechanism of N2O production in a quintessential karst reservoir, water samples were collected in a weak the...
Citations
... the standing water above the soil surface after flood events influences the CH 4 release positively (Shi et al., 2021). the two groups of methanogens (acetoclastic and hydrogenotrophic) play a key role in the biogenically produced CH 4 in anoxic conditions when the water stands above the soil surface (Kollah et al., 2018). Moreover, water table depth is negatively correlated with soil CH 4 emission (Soosaar et al., 2011). ...
Increasing atmospheric greenhouse gas (GHG) concentrations causes global temperature rising as well as extreme hydrological events. Understanding the effects of climate change-induced severe hydrological events such as flooding and drought on soil properties and subsequent GHG emissions from soil has enabled scientists to optimize different land management and global warming potential mitigation of a system. Flooding and drought dynamics affect soil physicochemical properties and GHG emissions specifically from land use systems that are adjacent to streams like riparian buffers. Drivers of soil GHG emissions and the effect of extreme hydrological events on the GHG flux from riparian systems in three climate zones (Mediterranean, temperate, and tropical/subtropical) were investigated in this review utilizing Web of Science and Scopus databases. Wet soil conditions contribute more to global warming (7.2 Mg CO2eq-C ha⁻¹ h⁻¹) than dry soils (2.1 Mg CO2eq-C ha⁻¹ h⁻¹) in riparian systems. Temperate riparian systems showed the greatest soil N2O emissions (0.7 mg N2O-N m⁻² h⁻¹) after flooding events/during wet seasons. The greatest CH4 (12 mg CH4-C m⁻² h⁻¹) and CO2 (15.2 g CO2-C m⁻² d⁻¹) flux from wet soils were observed in tropical/subtropical riparian systems. Greater soil inorganic N content (NO3⁻ and NH4⁺) in temperate riparian systems is responsible for the higher soil N2O flux during wet seasons. Intense precipitation events and greater soil carbon content in tropical/subtropical riparian systems contributed to more CO2 and CH4 emissions relative to the temperate and Mediterranean riparian systems.
