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
1Lomonosov Moscow State University, Faculty of Soil Science, 1, Leninskie Gory, Moscow, 119991, Russia
ann-bobrik@yandex.ru
2Earth Cryosphere Institute, SB RAS, 86, Malygina str., Tyumen, 625000, Russia
Keywords: Криогенные почвы, эмиссия СО, лабильный углерод почв, углерод микробной биомассы почв, влаж ность почв, температура почв, Permafrost-aff ected soils, CO2 efflux, soil labile carbon, microbial biomass carbon, soil moisture, soil temperature
Abstract
The spatial distribution of soil СO2 efflux measured at Novyi Urengoy station in southern tundra (Taz Peninsula) is determined by the soil volumetric moisture content and water-extractable organic carbon and with elevations above sea level. The contents of soil water-extractable and microbial biomass carbon are highly variable over the territory. The spatial distribution of the soil microbial carbon content 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.
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