This paper investigates the use of EVISAT/ASAR data for deriving forest information over Central Siberia. Temporal series of alternating polarisation data (HH and HV) at low and high incidence angles acquired at the Bolshemurstinsky test area are analysed. The backscattering coefficient of different forest types and land cover is analysed as a function of time, polarisation and incident angle using a GIS forest database available within the Siberia-II project. The results of the analysis indicate that HV data are adapted to forest/non forest mapping and both HH and HV are sensitive to low biomass values up to 50 m³ /ha