2017-06-082024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681572摘要:有別於河濱、潮間帶及海岸濕地,高山濕地的水源供給多仰賴雨水供應,然而近年氣候變遷顯著,對許多地區之水文條件造成不可忽略之改變,進因而影響其原生生物之生存環境,嚴重者可能對其造成威脅。本研究進行陽明山夢幻湖完整水文調查,包括降水量、地表逕流量、蒸發量、入滲量、水位等,並根據這些調查資料建立水文收支模式,以量化評估各水文參數的影對該保護區的影響程度。另外,夢幻湖為該區域相對低漥處,是周遭地表逕流之匯流點,故於湖區內設置自計式水位計,結合地形測量成果,即可得夢幻湖湖區之水位超越機率曲線,並繪製浸淹機率空間分布圖,可據此瞭解該濕地原生特有種「臺灣水韭」(Isoets taiwanensis DeVol.)生育地的浸淹時間及頻率。研究發現,本區1月跟7月總雨量相近,但降雨強度差異有明顯差異,表示7月降雨集中在某幾天,主要為颱風的影響,而1月降雨屬延續型的小雨量;水收量主要為降雨(precipitation),由當年度颱風強度(豐水)及東北季風挾帶降雨(枯水)所主導,降雨總量及降雨強度直接影響湖區水位變動;水支量於豐水時為逕流出流(runoff out),枯水時為入滲(infiltration),入滲量於湖區水位穩定時呈現穩定狀態(日平均入滲量約為5~6公分)。統整前述資料及成果,並結合臺灣水韭之生活史,可以定性、定量描述臺灣水韭於此濕地中面對之生存挑戰及威脅,以作為本區經營管理及生態保育之基礎。<br> Abstract: This study aims at hydrological survey and water-budget model development for Menghuan Lake of Yangming Mountain National Park. The hydrological condition of the Ecological Reserve is one of the important factors that affects the aquatic ecosystem. Aquatic plants growing in the lake were replaced by terrestrial plants gradually. The existence of the endemic pteridophyte Isoetes taiwanensis was found to be threatened seriously due to water level fluctuation. Field investigations and laboratory analysis were conducted during one year including water level and water depth survey, water depth and inundation frequency calculation, evapotranspiration and infiltration survey, rainfall and surface runoff survey, hydrological model establishment and water budget analysis.陽明山夢幻湖臺灣水韭水文水收支Menghuan LakeEcological Reservehydrologicalwater depthpteridophyte Isoetes taiwanensis106-107年陽明山國家公園夢幻湖生態保護區水文長期監測