Abstract: By using remote sensing and GIS, this paper studied the temporal changes of forest resources in Lushuihe Forest Bureau of Changbai Mountains. The results showed that in 1985, mature broadleaved and coniferous forests occupied 68.52% of the forest resources, but in 1999, medium-age broadleaved and coniferous forests occupied 65.96%. During the fifteen years, forest area increased by 17.6%, and the proportion of mature forests decreased from 68.52% to 48.72%. The forest resources in the study area changed greatly under the effects of human activities and natural factors. Some forest management measures adopted were not rational, and harmful to the progressive succession of forests. The volume structure of the forests was relatively single, and some forest management measures should be modified, with the cultivation of more local forest species to be strengthened.

Key words: Songnen Plain, Ecotone, Ecologic landscape geochemistry, Ecological coupling