V.N. Sukachev Institute of Forest
Laboratory of Ecophysiology of Permafrost Systems
WP 4b. Dissolved carbon in terrestrial and aquatic systems of permafrost-affected terrains of Central Siberian Plateau (DOC)
Prokushkin A.S. (PI), Tokareva I.V., Klimchenko A.V., Titov S.V., Kolosov R.V.,
Arctic and boreal regions have undergone significant changes during the last few decades, including northward shifts of vegetation, declining permafrost, increasing ALT and
soil temperatures, shortened fire return interval and increased river discharge. The fluxes of dissolved C within boreal and arctic watersheds and C linkages between terrestrial
and aquatic systems are important aspects of the carbon cycle of high latitude biomes and will be affected by the projected global change. One of the likely changes, an input of
terrigenous organic matter to surface runoff, will cause significant deterioration of river water quality and represent the main concern of water pollution management in permafrost
regions of Siberia. Thus, predictive tools to quantify changes in the amounts and chemical properties of river natural organic matter are needed for implementation of effective water
Workpackage studies address to characterize quantitatively and quantitatively the dissolved carbon and its spatio-temporal variations in forested basins underlain by permafrost in terms of its production, retention, transformation and release to streams/rivers. Specific target is the analysis of basin characteristics such as climate, soil, vegetation and fire disturbances, which impose major controls on terrestrial C production and its release to river network.
Geography and Methodology of research:
Studies are based on facilities of Tura site and cover ca. 40% of Central Siberian Plateau. There are three scales of studies of C concentrations, composition and fluxes:
Small-to-medium size catchments (3–220 km2), n=18
Large size catchments (5,000–170,000 km2), n=8
Fig. 1. Three scales of studies of dissolved C concentrations, composition and fluxes within Central Siberian Plateau: large, small-to-medium size catchment and stand. Red star represent Tura station, yellow circles are experimental plots in stands of different regeneration stages after fire disturbance.
Sampling and measurements:
In situ measurements:
Water sampling frequency:
Five to seven days during frost-free season (soil solutions, streams and 3 large rivers)
Sample type and treatment:
Subsamples for specific measurements:
Research plan for the field campaign of 2014:
1. Ecosystem inventories based on catena approach and class-specific sites are planned to validate earlier produced local land cover map (Tura site) and specifically create a detailed map
for stream basins subjected to fire disturbance in 2013, 2009 and 1993.