The agricultural environment research team of the Institute of Environmental and Plant Protection Research Institute of the Chinese Academy of Tropical Agricultural Sciences has made new progress in the research on the emission reduction and mechanism of active gaseous nitrogen in tropical farmland soil. It reported for the first time that the combined application of biochar and nitrification inhibitor can synergistically reduce the emission of nitric oxide (no) in tropical farmland soil, and revealed the relevant microbial regulation mechanism. The research results have important theoretical guiding significance for breakthrough of greenhouse gas emission reduction in tropical farmland and agricultural non-point source pollution prevention and control technology.
Schematic diagram of combined application of biochar and nitrification inhibitor to synergistically slow down no emission from tropical farmland soil
No is a typical atmospheric pollutant, which will lead to indirect greenhouse effect. Farmland soil is an important source of no release, and the application of chemical fertilizers intensifies its release intensity. Nitrification and denitrification are the two main microbial processes of soil NO production. How to utilize and regulate this process is the key to the reduction strategy of farmland active nitrogen. The results showed that nitrification inhibitor could weaken the effect of activated nitrification process caused by biochar application, and thus slow down no emission driven by nitrification process; Biochar can promote the consumption of no under the application of nitrification inhibitors, thereby reducing the no emission driven by denitrification process; The combination of the two treatments could synergistically reduce the abundance of nirK gene and significantly affect the bacterial community structure. Therefore, the combined application of biochar and nitrification inhibitor can synergistically and efficiently slow down no emission from tropical farmland soil.
The relevant research results were published in environmental research, a journal of JCR district I, under the title of "synergistically limiting nitric oxide emission by CO applications of biochar and industrialization inhibitor in a tropical agricultural soil". Dr. Fan Changhua of the Environmental and Plant Protection Research Institute of CATAS is the first author, and associate researcher Chen Miao and researcher Li Qinli are the co authors of the paper. The research was completed at the auxiliary point of Danzhou national field scientific observation and research station of tropical agricultural ecosystem, and was supported by the National Natural Science Foundation of China, Hainan Provincial Natural Science Foundation, Hainan provincial major science and technology plan and other projects.
