| Summary: | 碩士 === 國立宜蘭大學 === 森林暨自然資源學系碩士班 === 101 === This study investigated the 38 mountain’s shallow lakes and palustrine wetlands in Yilan area. A total of 1444 plots were analyzed by the processes of two-step methods. Detrended Correspondence Analysis (DCA) and Cluster Analysis were first used to classfy the vegetation types. Then the species covers of each vegetation type were combined to form a synoptic table. Finally similar vegetation types were combined into higher classes based ondiagnostic spccies. The vegetation of mountain’s shallow lakes and palustrine wetlands in Yilan area consists of 64 associations. These associations cauld be grouped into 17 alliances: Lemna aequinoctialis Alliance (3 associations), Potamogeton octandrus Alliance (3 associations), Hydrilla verticillata Alliance (1 association), Ceratophyllum demersum Alliance (1 association), Nymphaea tetragona Alliance (2 associations), Eleocharis congesta subsp. japonica Alliance (1 association), Schoenoplectus mucronatus subsp. robustus Alliance (4 associations), Eleocharis dulcis Alliance (1 association), Hyophila propagulifera Alliance (1 association), Pyrrhobryum dozyanum Alliance (3 associations), Sphagnum junghuhnianum Alliance (6 associations), Carex phacota Alliance (7 associations), Isachne globosa Alliance (8 associations), Polygonum foliosum Alliance (6 associations), Juncus effusus var. decipiens Alliance (10 associations), Miscanthus sinensis Alliance (5 associations) and Salix kusanoi Alliance (3 associations). The associations could be grouped into 8 formations including Floating plant Formation, Submerged plant Formation, Floating-leaved plant Formation, Emergent plant Formation, Moss plant Formation, Marsh Formation, Tall grass plant Formation and Swamp forest Formation. These 8 formations could be combined into 6 classes comprising Floating plant Class, Submerged plant Class, Floating-leaved plant Class, Marsh Class, Tall grass Class and Swamp forest Class.
In this study, a mountain wetland classification system was developed, and the proposal system may be useful for the purposes of management and conservation.
|
|---|
