СО2 FLUXES AT THE CLEAR-CUT IN THE SOUTHERN TAIGA OF EUROPEAN RUSSIA
V. V. Mamkin1, V. K. Avilov1, D. G. Ivanov1, A. V. Olchev1,2, J. A. Kurbatova1
1A.N. Severtsov Institute of Ecology and Evolution of RAS, Moscow, Russia
2Lomonosov Moscow State University, Moscow, Russia
Keywords: сплошная вырубка, потоки CO, углеродный цикл, южная тайга, NEE, TER, GPP, Clear-cut, CO fluxes, carbon cycle, southern taiga, NEE, TER, GPP
Abstract
Forest disturbances induced by the clear-cutting (CC) leads to the transformation of the natural biogeochemical processes, which determining main greenhouse gas fluxes (principally CO2) between forest ecosystems and the atmosphere. Effects of clear-cutting on CO2 exchange substantially vary depending on local environmental and climate conditions. This study is focused on estimation of net ecosystem exchange of СО2 (NEE), gross primary production (GPP), total ecosystem respiration (TER) and soil respiration in southern taiga in European Russia. The results are based on continious eddy covariance measurements during the 2 growing seasons (2016 and 2017). The research showed that the clear-cut was a consistent source of CO2 for the atmosphere during the first years following harvest (NEE since May to october is 553.3 2016 and 193.3 g С∙m-2 in 2017). Interannual variability of the cumulative NEE, of GPP (777.5 g С∙m-2 in 2016 and 1020.5 g С∙m-2) and decrease in TER (1330.95 g С∙m-2 in 2016 and 1213.7 g С∙m-2 in 2017). The results of chamber measurements showed, that soil respiration in the midday hours in summer changed between 3.6 ± 0.7 and 11.8 ± 3.0 μmol∙m-2∙s-1 in 2016 and between 6.0±1.3 and 14.8±3.5 μmol∙m-2∙s-1 in 2017 at the different plots within the clear-cut site. The estimates of the cumulative GPP at the clear-cut in southern taiga of European Russia exceed the GPP rates obtained previously in the other clear-cut forest ecosystems, located in boreal and sub-boreal ecozones.
|
