[M-IS01] [EE] Environmental, socio-economic and climatic changes in Northern Eurasia

[MIS01-P06] CO₂ and heat fluxes in a recently clear-cut spruce forest in European Russia.

*Vadim Vital'evich Mamkin¹, Julia Alexandrovna Kurbatova¹, Vitaly Constantinovich Avilov¹, Dmitry Genad'evich Ivanov¹, Alexandr Valentinovich Olchev² (1.Severtsov Institute of Ecology and Evolution, Russian Academy of Science, Moscow, Russian Federation, 2.Faculty of Geography, Lomonosov Moscow State University, Moscow, Russian Federation)

Keywords:Carbon cycle, heat fluxes, eddy covariance, clear-cutting

Ecosystem carbon dioxide, energy and water fluxes were measured using eddy covariance and portable chambers in a fresh clear-cut surrounded by a mixed spruce-birch-aspen forest in the boreal zone of European Russia. Measurements started in April 2016 following harvest and continued for five months. The clear-cut was a permanent source of CO₂ to the atmosphere. Total ecosystem respiration (TER) and gross primary production (GPP) were about 7.4 gC m^-2 and 4.1 gC m^-2 per day respectively. Eddy covariance data showed a reasonable accordance with the chamber measurements. During the mid-spring the mean daily latent (LE) and sensible (H) heat fluxes were similar and the Bowen ratio (Bo=H/LE) averaged about 1.0. During the late spring and summer months the net ecosystem exchange of CO₂ (NEE) remained slightly positive following onset of vegetation growth, while Bo was changing in the range from 0.3 to 0.5. There was strong diurnal variability in NEE, LE and H over the measurement period that was governed by solar radiation and temperature as well as leaf area index (LAI) of regrown vegetation. This study was supported by a grant from the Russian Science Foundation (14-14-00956).