The microbial mechanism of soil greenhouse gas emissions under long-term conservation tillage in dryland (Soil Metagenome)
Dryland area in our country accounts for about 56.84% of the total arable land area, is the main agricultural production in the process of CO2 and N2O emission source. Conservation tillage because of its advantage such as soil improvement, soil, it has been a large area of arid regions in the north extension and application. At the same time, long-term conservation tillage can change soil microenvironment, influence the soil microbial community structure and ecological function, and, in turn, affects the soil in greenhouse gas emissions. So the long-term conservation tillage under dryland farmland CO2 and N2O emissions of microbial mechanism has important guiding significance to the production and application of ecological value. This project base on dryland agricultural production and farmland ecological status quo, research on dryland farmland major greenhouse gas CO2 and N2O emission characteristics, combined with the soil carbon source utilization of the microbial community diversity, carbon and nitrogen function the change of the microbial community structure and abundance composition, constructing a structural equation model, revealing the microorganisms in long-term conservation tillage under dryland farmland and the functional mechanism of CO2 and N2O emissions, to build efficient, ecological and sustainable conservation tillage technology system to provide theoretical support, and for the science promotion of conservation tillage technology to lay the theoretical foundation.