Field investigations were performed in the central Lena Delta. In total, 26 sites were investigated. The sites were chosen to represent a variety of vegetation communities of the investigated region. For every field site a detailed description of the vegetation was made. Foliage projective cover for all major taxa estimated as percent and averaged from five representative 2 x 2 m plots within 30 m² sites (for Larix Cajanderi directly on the 30 x 30 m site). All data was collected by scientists from Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Research and University of Potsdam, Germany.