ИСТИНА

Along with other ecological functions soils can serve as a sink and a source of climatically active gases in urban ecosystems. The importance of studying the role of urban soils in climate change mitigation is reflected in the global climate agenda and the state development strategy. A large proportion of urban spaces are occupied by soils under lawns, which deposit carbon, including carbon dioxide and methane. According to many researchers, one of the factors influencing the emission of greenhouse gases from soils are fertilizers. Applied to increase the productivity and stability of lawns, fertilizers can affect the formation of CO2 and CH4 flows. However, currently the role of soils in this case has not been studied enough, therefore search for a mechanism of greenhouse gas emission control in urban ecosystems is relevant. The effect of mineral fertilizers on CO2 and CH4 emissions from urban lawn soils was investigated in 2021-2022 at the experimental plot in the MSU Botanical garden. 4 types of complex mineral fertilizers with different ratios of nutrients in higher and lower doses have been applied to the soils under urban lawns. Soddy soils on technogenic sediments contaminated with heavy metals were studied. Field sampling of soil and soil air and laboratory studies were carried out at 8 sites with fertilizers applied and a control site. Greenhouse gas emissions were investigated by static chamber method with quantitative analysis on a gas chromatograph, the main soil properties were studied by conventional methods. Laboratory incubation experiments involving microbial respiration and the potential formation and oxidation of methane were conducted by kinetic methods. Seasonal dynamics of research should be highlighted.