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Annual emission of carbon dioxide from soils of the southern taiga zone of Russia

Data on the dynamics of CO 2 emission from soddy weakly podzolic and gray forest soils of the southern taiga zone have been obtained in the course of year-round field observations for 26 months. A modified method of determining the CO 2 efflux from soils in the winter period is suggested. It is shown than annual dynamics of the CO 2 emission from soils depends on particular weather conditions. The curves of emission may have either one peak or several peaks (a serrate type of the curve) in the summer period. In the winter period (from November to April), the rate of soil respiration does not exceed 100 mg C/(m 2 h), but it is always higher than 0 mg C/m 2 per h. In the summer period (from May to October), the rate of soil respiration is 3.5 to 4.5 times higher than in the winter period. Annual efflux of CO 2 from the soils of the southern taiga zone varies from 2.65 to 11.5 t C/ha depending on the weather conditions of the year and the particular types of soils and phytocenoses. The contribution of winter respiration to annual respiration constitutes 21-27% in the soils under natural cenoses and 12-14% in the soils under agrocenoses. The most significant influence on the CO 2 emission is exerted by the soil temperature. In particular, the respiration intensity of soddy-podzolic soils is very sensitive to temperature fluctuations.