Simulating total carbon changes in soil and carbon dioxide emissions was carried out using the simulating program DNDC. The assessment covered soils of three different types of land-use (arable, meadow and forest). The aim – simulating of carbon dioxide emissions from arable, meadow and forest soil and total carbon quantity in selected soil evaluating climate change. The assessment used the data received from an analysis of the total carbon quantities in soil of the Neris Regional Park. Data for the assessment of carbon dioxide emission were obtained upon carrying out investigations in autumn in the same locations where the total carbon quantity was determined. The value of total carbon simulated in meadow soil was lower by 3.4%, in arable soil was lower by 4.5%, in forest soil was lower by 1.4% comparing to experimental data. The value of CO₂ emission simulated from meadow soil was higher by 24%, from arable soil was higher by 26% and from forest soil was higher by 27% comparing to experimental data.