How to reduce greenhouse gas emissions from soil amended with organic matter?
Agriculture is responsible for emissions of greenhouse gases such as carbon dioxide (CO2) and nitrous oxide (N2O). Production of these gases in soil results from the biological processes like organic matter decomposition, nitrification and denitrification. These processes are regulated by easily decomposable carbon, mineral nitrogen, temperature, pH and moisture content in soil. We aim at analyzing effects of these parameters on CO2 and N2O emissions. In particular, we are interested in agricultural soil amended with livestock compost.
Analysis of groundwater contamination with inorganic N in Central Vietnam by using stable isotopes and microbial technologies
High concentrations of inorganic nitrogen (NH4-N and/or NO3-N) were found in groundwater below vegetable fields in the downstream areas of the Huong River, Central Vietnam. The objective of the study is to determine the contamination sources and mechanisms of nitrogen contamination in groundwater by using 15N natural abundance (δ15N) and functional genes of microorganisms. We have developed a new method to collect NH4-N, NO3-N, and organic N in water samples for δ15N analysis. Functional genes like narG, napK, and nosZ are quantified to obtain the information on nitrogen dynamics in deep soil.