Seasonal Dynamics of СO.sub.2 Emission from Soils of Kursk

The spatiotemporal variability of CO.sub.2 emission from soils of Kursk under different land uses, pollution levels, and soil geneses has been assessed. Data on the seasonal dynamics of CO.sub.2 emissions in background (forested recreational areas) and urban soils under the anthropogenic impact are presented. Seasonal dynamics of soil СÐ.sub.2 emission depends on a number of factors: season, type of soil, organic matter content, anthropogenic modifications of soil profiles, hydrothermic conditions, and heavy metal pollution. Soil hydrothermic conditions to a greater extent determine the intensity and characteristics of the seasonal dynamics of soil CO.sub.2 emission with a maximum in summer. In anthropogenic soils, multidirectional transformation of soil CO.sub.2 emissions is noted. The intensity of CO.sub.2 emission from soils of various geneses is quite different. Heavy metal pollution of the soil has an ambiguous effect on the CO.sub.2 emission processes. The CO.sub.2 emission rate from Urbic Technosol increased by 16.4% in comparison with that from the background Luvic Chernozem (Loamic, Pachic), while for Technic Greyzemic Phaeozem (Loamic) this parameter decreased by 47% in comparison with the background Greyzemic Phaeozem (Loamic). In Carbic Podzols polluted by heavy metals, the averaged CO.sub.2 emissions are generally similar to those from the background soils unpolluted by heavy metals.