Abstract: The estimations of thirteenyear interval vegetation fractional coverage (VFC) of Genhe forest reserve area were conducted using Landsat-5 TM data acquired in 2000 and GF-1 images in 2013 based on the dimidiate pixel model. The changes of VFC and the relationships between VFC and topographical factors were analyzed. Validated against the field measurement conducted in August 2013, the estimation of VFC using GF-1 image was reliable (R²=0.52, RSE=0.54). The factor that was most positively correlated to the VFC was the altitude, followed by the slope. The VFC declined generally from 2000 to 2013 and the high level of VFC experienced the most obvious change. In particular, both VFCs in 2000 and 2013, as well as their differences which were mostly positive, increased with the altitude until 1027 m, above which the VFC changed slightly. Forest fires, rich drainage and forest tending had great impacts on the decrease of VFC in the lowaltitude mountainous region.

Key words: the east of Daxing’an Mountains, allocation, forest vegetation, additive biomass model, carbon storage