Komarova T., Vasenev I., Alilov D., Taller E. Ecological assessment of the succession dynamics in soil carbon stocks and CO2 fluxes in centenary sequence of fallow lands in the Central Forest reserve . Electronic science-productive magazine "AgroEcoInfo", 2018, N 3

2018, N 3 (33)

ECOLOGY

*Komarova T., Vasenev I., Alilov D., Taller E.*
Ecological assessment of the succession dynamics in soil carbon stocks and CO₂ fluxes in centenary sequence of fallow lands in the Central Forest reserve
Investigation of land use change impacts on the level of organic carbon accumulation and soil CO₂ fluxes in representative zonal ecosystems is important element of the modern system of greenhouse gas fluxes monitoring and management in terrestrial ecosystems. This paper presents the results of a round-the-year 2017 monitoring of soil CO₂ emission in comparable sites of the fallow lands chrono sequences in conditions of a representative area of the Central Forest Reserve with background wood-sorrel spruce forests which are typical for the southern taiga zone of Central Russia. In the basis of the analysis are statistically processed results of the monthly (in the summer – decadal) observations with measured in situ by mobile gas analyzer Li-820 soil CO₂ fluxes associated with measurements of temperature in the atmospheric surface layer and topsoil moisture and temperature plus adjoint estimation of aboveground biomass in chrono sequences: "0 – time" fallow with herbaceous cover, 10-15 years old, 20-30 years, 50-60 years and over 100 years of overgrowing forest lands. Studies were conducted in previously used for arable land plots in frame of geomorphologically comparable areas of the landscape “Krasnoye” in the southern forestry of the Central Forest Reserve, compactly located within the 300-meter transect with the same mesorelief form (the middle part of the long slope by Western exposure) and Sod-Podzoluvisols. Research revealed the maximum intensity of soil CO₂ emission (up to 11-12 g C-CO₂ m-2∙day-1) in the meadow fallow land and its gradual decreasing in process of reforestation down to values close to background ecosystems in 4-5 g C-CO₂ m-2∙day-1 in the last investigated succession study with wood-sorrel spruce older than 100 years, which is in good correlation with the gradual humus accumulation in topsoil due to reduced mineralization of organic compounds from dying vegetation. Keywords: SOIL ECOLOGICAL ASSESSMENT, GREENHOUSE GASES, GLOBAL CLIMATE CHANGE, CO₂ EMISSION, SOIL RESPIRATION, SOIL ORGANIZACI CARBON, SOD-PODZOLUVISOLS, LAND-USE CHANGE, MAN-MODIFIED SOILS, FALLOW SOILS, SOIL DYNAMICS, SUCCESSION