棲蘭山鴛鴦湖水體的分層與混合現象

Stratification and Mixing Regime of the Yuan-Yang Lake, Chi-Lan Shan, Taiwan

薛郁欣(Yu-Hsing Hsueh) ； 藍煜翔(Yu-.Xiang Lan) ； 蔡正偉(Jeng-Wei Tsai) ； 吳俊宗(Jiunn-Tzong Wu) ； 柳文成(Wen-Cheng Liu) ； 林芳邦(Fang-Pan Lin) ； 周秀美(Hsiu-Mei Chou) ； 邱志郁(Chin-Yu Chiu)

《中華林學季刊》 43卷4期 (2010/12) Pp. 635-646

https://doi.org/10.30064/QJCF.201012.0009

摘要

鴛鴦湖地處亞熱帶高山地區，屬於富含腐植物質的淺水貧營養湖泊。水體溫度剖面隨各季節氣候而明顯不同，颱風時節的降雨量及逕流，對湖泊的水體分層造成成不同程度的擾動。本項研究的目的，在於探討鴛鴦湖不同季節的水體混合現象，及其主要的影響機制。夏季頻繁的午後陣雨、颱風、季節轉換，皆會改變湖水原有的溫度分層結構。其中，颱風暴雨引起的混合最為劇烈迅速，而湖水混合的程度與降雨量與水位變化成正相關；暴雨過後，受夏日大量太陽輻射能的照射，湖泊能夠在當日立即恢復分層結構。秋冬季節水體混合的時間維持較久，主要受到氣溫的影響。湖水混合現象能增加湖泊溶氧度及營養鹽濃度，進而影響生物群落消長以及生態系代謝之表現。

關鍵字

颱風 ； 分層 ； 混合效應 ； 湖沼學 ； 湖泊代謝

並列摘要

Yuan-Yang Lake (YYL) is a shallow humic and oligo-trophic lake located in a subtropical alpine area. It. Seasonally water temperature is the major diveing force for the stratification and mixing of the lake. However, rainfall is the main cause to mix the lake during typhoon seasons. The purpose of this study was to explore the seasonal changes of the mixing regime in YYL. Rainstorm, typhoons, and temperature determined the thermal stratified structure of the lake. Typhoons would cause fast mixing of YYL, and the lake stratification recovered within one or two days after the typhoon cease in summer. Temporal mixing events could release nutrients from the sediment and increase the concentration of dissolved oxygen in the hypolimnion, which might change the performance of the ecosystem metabolism and compositions of biological communities.

並列關鍵字

Typhoon ； Stratification ； Mixing ； Limnology ； Lake metabolism