查詢結果分析
來源資料
頁籤選單縮合
題名 | 七星山2001年野火對夢幻湖水質之影響=Influence of 2001 Wild Fire on the Water Chemistry of Dream Lake in Seven-Star Mountain |
---|---|
作者 | 王立志; 王怡平; 尤靖雅; 陳俊雄; Wang, Lih-jih; Wang, Yi-ping; Yo, Jing-ya; Chen, Chuen-hsiung; |
期刊 | 國家公園學報 |
出版日期 | 20060600 |
卷期 | 16:1 民95.06 |
頁次 | 頁53-64 |
分類號 | 371.5 |
語文 | chi |
關鍵詞 | 夢幻湖; 水質; 野火; 濱水植群緩衝; Dream lake; Water quality; Fire; Riparian vegetation buffering; |
中文摘要 | 公元20017月2日,陽明山國家公園後湖戰備公路發生火災,延燒七星山東麓約25公頃土地,甚至延燒至夢幻湖集水區西北側邊緣坡地,可能危及國寶植物—台灣水?的生存。本研究主要目的即在監測夢幻湖集水區降雨及湖水水質變化,以評估2001年野火對國寶植物—台灣水?生存的可能衝擊。自2001年9月至2002年8月籃測止,結果顯示,夢幻湖集水區降雨及湖水水質變異極大,皆呈酸性。水中離子平均濃度以□、□與□為最高,其次為□、□與□。此結果顯示夢幻湖集水區降雨及湖水水質可能因距海較近而受海鹽飛沫影響,且可能因近小油坑硫磺噴氣區及酸性沉降影響而致使□較高。而研究期間湖水水質變異亦受降水及間接水位變化影響。然與過去水質研究比較結果顯示,野火延燒並未影響至夢幻湖水質變化,野火後灰燼雖見於湖緣闊葉林及柳杉林地地表,然並未進入湖區。夢幻湖周圍的多層次植群系統可能提供重要的緩衝功能。本研究並進一步依集水區水流路徑,監測雨水、穿落水、土壤水及湖水間水質變化,以了解湖緣植群的緩衝機制。降雨進入三種湖緣植群後的水化學剖面性質不一;其中雨水滲入芒草區土壤,水中酸鹼值反小幅上升,而□濃度顯著下降,可能顯示芒草植群恢復生長後的主動吸收;而天然闊葉林下穿落水水質變異極大,除□離子濃度因樹冠淋溶作用而明顯增高外,其餘離子濃度與降水水質相近,有時於多日乾操後呈現海鹽及硫化物乾性沉降現象。闊葉林土壤水中酸鹼值亦小幅上升,然而□濃度顯著上升,可能顯示天然林地枝葉層旺盛的微生物分解作用;至於柳杉林穿落水水質除□離子濃度明顯增高外,其餘離子濃度與林外降雨水質相近。柳杉林土壤水中酸鹼值亦小幅上升,然而□濃度顯著上升,可能亦顯示柳杉林地枝葉層旺盛的生微生物活動。比較湖水與周邊柳杉林土壤水水質顯示差異不大,然而柳杉林土壤水中□濃度顯著較高,可也顯示柳杉林因不定期淤水所形成的旺盛微生物分解作用。綜合而言,比較過去其他相關研究結果顯示2001年野火前後水質條件,尚在夢幻湖水水質變異範圍之內,並未顯示明顯影響,依臺灣水?耐受性評估,短期內將不至於影響臺灣水?的生存,而湖緣多層次之亡草及森林植群亦可能提供重要的緩衝功能。 |
英文摘要 | A wildfire occurred in the Seven-Stars Mt. which burned 25 ha of the Reserve Area in Yangmingshan National Park on July 2, 2001. This burning also threatened the unique habitat, Dream Lake, for the endangered species Isoetes taiwanesis DeVol. In order to evaluate the burning impact on the survival of Isoete, weekly rain water and lake water samples were analyzed for aions and cations from September, 2001 to August, 2002. Results showed that rain water and lake water were both acidic. Dominant ions were □, □ and □, showing rain water and lake water were possibly affected by the sea-salt spray, geological sulfur release and acidic deposition. Dream lake water was also affected by precipitation and possible changes in water level. Compared with previous study, no significant change occurred to distinguish the burning impact on the lake water quality. Riparian vegetation might buffer the burning effects to avoid water quality impairment. In order to further understand the buffering mechanism from lakeside vegetation, further comparison among rainfall, throughfall, soil water and lake water were conducted along the flow paths in grassland, natural hardwoods and Cryptomerria plantation in the Dream Lake watershed. As water infiltrated into the grassland soil, pH increased slightly, yet □ concentration decreased significantly, possibly showing uptake by grass re-growth. Throughfall chemistry in hardwoods showed large variation, with significant increase in □, indicating canopy leaching. Chemistry of soil solution in the natural hardwoods showed □ increases in the rooting zone, indicating possible vigorous microbial activities for decomposition in soil layers. There were also signs of □ leaching in the canopy, and significant □ increases in the rooting zone of Cryptomerria plantation. Nevertheless, there were no significant differences between soil water of Cryptomerria plantation and the lake water, yet the high level of □ concentration in the deep soil water of the plantation might be the result from infrequent impoundment in lakeside plantation. In summary, results showed no significant effect on lake water chemistry from 2001 burning to endanger the survival of Isoetes in near future. Multi-layer of riparian vegetation might provide vital buffering in the Dream Lake watershed. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。