关键词: 木质纤维素酶, 质量损失, 高山林线交错带, 锦丝藓, 高山冷蕨

Abstract: By using GIS technology, and taking water level change, bank slope of reservoir, and small scale geomorphology as the environmental evaluation indicators, the water level elevationslope and spatial geomorphological maps of the Three Gorges Reservoir were drawn, based on the digital topographic map, and, through overlay analysis, the ecological types of waterlevelfluctuating zone (WLFZ) in the Reservoir were classed. The ecological types of the WLFZ could be classified into 6 classes and 12 subclasses, including perennial submerged WLFZ (gentle slope and steep slope), periodic submerged WLFZ (gentle slope and steep slope), perennial nonsubmerged WLFZ (gentle slope and steep slope), island WLFZ (submerged and nonsubmerged), lake basinestuaryreservoir bayreservoir tail WLFZ (lake basin, estuary, bay, and reservoir tail), and valley WLFZ. The periodic submerged WLFZ, perennial nonsubmerged WLFZ, and lake basinestuaryreservoir bayreservoir tail WLFZ together accounted for 82.2% of the entire WLFZ area, indicating that the three main ecological types should be artificial ecological restorationbased and supplemented by natural recovery, while the perennial submerged WLFZ, island WLFZ, and valley WLFZ accounted for 17.8% of the entire WLFZ area, which should be natural recoverybased and supplemented by artificial ecological restoration.

Key words: lignocellulose enzyme, mass loss, alpine timberline ecotone, Actinothuidium hookeri,  Cystopteris montana.