Energy and mass exchange and the productivity of main Siberian ecosystems (from Eddy covariance measurements). 1. heat balance structure over the vegetation season

Direct measurements of heat balance (latent heat and sensible heat fluxes) by the eddy covariance method, undertaken in 1998–2000 and 2002–2004, are used to obtain information on the daily, seasonal, and annual dynamics of energy and mass exchange between the atmosphere and the typical ecosystems of Siberia (middle taiga pine forest, raised bog, and true four grass steppe with data for typical tundra) along the Yenisei meridian (90° E).