5:15 PM - 6:45 PM
[AHW22-P03] Changes of greenhouse gas emissions and microbial communities in different rice plantation
Keywords:rice paddy, greenhouse gas emission, denitrification, straw return, water-saving irrigation
Climate change and global warming are widespread concerns for humanity today. The primary cause of global warming is the increased concentration of greenhouse gases (GHGs) in the atmosphere. Methane (CH4) and nitrous oxide (N2O) are major greenhouse gases with high global warming potential over a 100-year time horizon compared to CO2. Anthropogenic CH4 and N2O emissions are predominantly associated with agricultural activities, particularly rice cultivation, due to the extensive use of chemical fertilizers and the creation of prolonged anaerobic soil conditions. Therefore, it is crucial to reduce CH4 and N2O emissions from agricultural activities to mitigate global warming.
To investigate the effects of various environmental factors on GHG emissions from agricultural fields, a field experiment was conducted in Xindian District, New Taipei City, Taiwan. Four different rice cultivation practices were carried out simultaneously in the experimental site. One rice field was irrigated using water-saving techniques (WS), another was planted with returned rice straw to the farmland (S), a third received both treatments (S+WS), and the last field served as the control treatment (C). Soil samples were collected from the four rice plantations to analyze their physical and chemical properties, including physical properties such as soil water content and pH, and chemical properties such as NH4 and NO3-. Additionally, soil microbial communities were analyzed using next-generation sequencing of 16S rRNA genes.
The preliminary results showed that S+WS treatment has the lowest N2O emission rate in harvest season and straw return treatment has highest dissolved organic carbon in the soil (DOC).
The findings suggest that combine both straw return and water-saving treatments may significantly reduce the GHG emissions of N2O and CH4 and can be further considered for widespread application in the future.
To investigate the effects of various environmental factors on GHG emissions from agricultural fields, a field experiment was conducted in Xindian District, New Taipei City, Taiwan. Four different rice cultivation practices were carried out simultaneously in the experimental site. One rice field was irrigated using water-saving techniques (WS), another was planted with returned rice straw to the farmland (S), a third received both treatments (S+WS), and the last field served as the control treatment (C). Soil samples were collected from the four rice plantations to analyze their physical and chemical properties, including physical properties such as soil water content and pH, and chemical properties such as NH4 and NO3-. Additionally, soil microbial communities were analyzed using next-generation sequencing of 16S rRNA genes.
The preliminary results showed that S+WS treatment has the lowest N2O emission rate in harvest season and straw return treatment has highest dissolved organic carbon in the soil (DOC).
The findings suggest that combine both straw return and water-saving treatments may significantly reduce the GHG emissions of N2O and CH4 and can be further considered for widespread application in the future.