SPATIAL DISTRIBUTION OF SOIL CARBON CYCLE COMPONENTS AND ENVIRONMENTAL FACTORS IN SOUTHERN TUNDRA ECOSYSTEMS OF THE TAZ PENINSULA
A.A. Bobrik1, O.Yu. Goncharova1, G.V. Matyshak1, M.O. Tarkhov1, N.M. Petrzhik1, D.S. Drozdov2, O.E. Ponomareva2
1 Lomonosov Moscow State University, Faculty of Soil Science, 1, Leninskie Gory, Moscow, 119991, Russia; ann-bobrik@yandex.ru
2 Earth Cryosphere Institute, SB RAS, 86, Malygina str., Tyumen, 625000, Russia
The spatial patterns of soil СO2 efflux measured at the Novyi Urengoy station in southern tundra (Taz Peninsula) correlate with soil volumetric moisture and water-extractable organic carbon and with elevations above sealevel. The contents of soil water-extractable and microbial biomass carbon are highly variable over the territory. The distribution of soil microbial biomass partly depends on organic layer thickness and soil moisture, which are responsible for 19 % and 8 % of its variance, respectively. The environmental factors of active layer thickness, soil volumetric moisture, and soil surface temperature are relatively stable as the soil and vegetation covers are homogeneous while the soil organic layer is thin.
Permafrost-affected soils, CO2 efflux, soil labile carbon, microbial biomass carbon, soil moisture, soil surface temperature