Abstract: An investigation was conducted on the living tree volume, coarse woody debris (CWD) loading, and composition of Larix gmelinii forest along a human disturbance gradient, i.e., no disturbance (natural larch forest), one-time d isturbance (natural forest was disturbed once only), and two-time disturbance (natural forest was disturbed two times consecutively), on the northern slope of Greater Hinggan Mountains. The results showed that under no disturbance, one -time disturbance, and two-time disturbance, the average living tree volume of L. gmelinii forest was 1616, 1383, and 1148 m3·hm-2, and the average CWD loading was 6977, 3664 and 3261 m3·hm-2, respectively . In natural L. gmelinii forest, most of CWD was of 20〖KG-*2〗-〖KG-*7〗40 c m diameter class, among which, fallen logs occupied 72%, and snags and stumps oc cupied 28%; while in one-time and two-time disturbance L. gmelinii forests, most CWD was of 10〖KG-*2〗-〖KG-*7〗30 cm diameter class, with the fallen logs , snags, and stumps occupied 70%, 14% and 16%, and 57%, 15% and 28%, respectivel y. Human disturbance reduced the CWD loading of L. gmelinii forest and altere d the composition of the CWD.

Key words: fiber quality index, meteorological factor, ecological distribution, GIS.