| 湖泊中溶解氧极大值之成因 |
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| 引用本文： | 陈镇东,万政康,王冰洁.湖泊中溶解氧极大值之成因[J].湖泊科学,1995,7(1):57-64. |
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| 作者姓名： | 陈镇东 万政康 王冰洁 |
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| 作者单位： | 国立中山大学海洋地质研究所 台湾高雄市 |
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| 摘 要： | 本文对位于台湾南部两个次高海拔湖泊－大鬼湖及万山神池进行研究，并试图探讨此二无明显进，出水口之封闭型湖泊中，水体溶解氧垂直分布出现极大值之成因，此二次高海拔湖泊地处偏远，人烟罕至，因此较不受人为干扰，为研究湖泊水体中种种自然作用的良好对象，大鬼湖平均水深约14.8m，最深处约40m，降冬季外，水体均有分层现象，1988年夏季资料显示，水深16m以下水体趋于无氧状态，且于此深度以上的溶氧饱和值，均接近当地的大气饱和值（约78％），经各种资料推断，此极大值的成因，除水团乃于春季时留下主溶氧值之外，应综合了季节增温效应下使表水向下温合的物理作用（尤其是山区明显的口，夜温差所引起的表水冷却向下混合作用，且其混合深度随季节增温而逐步变浅），消耗溶解氧的生物作用及跃层存在等影响因素，而非单纯的物理或生物作用所造成，1991年4月万山神池观测资料显示，湖水平均深度约8m，最深可达14m ,其氧饱和程序分布在80％－104％之间，表水接近近当地饱和值（78％），而于1.5m处往下增加，于2m处有溶解氧及和程度极大值，比当时大气饱合值高约20％，此极大值深度与叶绿素a极大值深度相吻合，主要由生物之光合作用造成，此外，于此深度pH值亦有明显增加现象，更证实了生物作用的存在，此二湖环境背景相似，且水泥中均出现溶氧极大值，但二者间极大值却有不同的成因，经曲两不同成因的比较，将可提供许多相关研究资料。
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| 关 键 词： | 大鬼湖 万山神池 溶解氧极大值 pH值 湖泊 成因 水温 |
| 收稿时间： | 1993/10/14 0:00:00 |
| 修稿时间： | 1993/12/22 0:00:00 |
Formation of dissolved oxygen maximum in lakes |
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| C. T. A. Chen,J. K. Wann and B. J. Wang.Formation of dissolved oxygen maximum in lakes[J].Journal of Lake Science,1995,7(1):57-64. |
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| Authors: | C T A Chen J K Wann and B J Wang |
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| Institution: | Institute of Marine Geulogy.National Hun Yal-sun Uniw., Kaushinng, Taiman,Institute of Marine Geulogy.National Hun Yal-sun Uniw., Kaushinng, Taiman and Institute of Marine Geulogy.National Hun Yal-sun Uniw., Kaushinng, Taiman |
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| Abstract: | This study elucidates the main cause for the dissolved oxygen maximum of the Great Ghost Lake and Wannsan Divine Lake, both belonging to the best preserved natural lakes in Taiwan, with little pollution because of high elevation and isolation. There are also deep natural lakes, suitable for study of chemical, physical, and biological processes under natural, undisturbed conditions.The average depth of the Great Ghost Lake is about 1 4. 8m , the max. depth is about 40m and the water body is stratified annually except in winter. Based on the data collected in summer(1988), the oxygen content was about 6 mg/L at surface and was sharply reduced between 10m and 16m, and became anoxic below 16m. There was an oxygen maximum of about 7 mg/L (close to saturation) at 8 - 10m. The maximum was mainly controlled by physical processes driven by surface cooling accompanied, with oxygen influx during the previous seasons. The subsurface remnant cooler water with high oxygen content remained steady while the surface layer warmed. Below the maximum oxygen, the oxygen content was sharply reduced because of mixing with anoxic water below. Photosynthesis did not play a major role and there was not a pH maximum at the oxygen maximum.The average depth of Wannsan Divine Lake is about 8m and about 14m in maximum depth. The saturation of oxygen ranged between 80% -104%. The surface water, at 80%, was close to the saturation value of 78%,and the oxygen content increased with depth below 1. 5m. There was a maximum of oxygen saturation, about 20% higher than the solubility, at 2m. Contrary to the phenomena found in the Great Ghost Lake, the maximum at Wannsan Divine Lake was mainly caused by photosynthesis and was accompanied by a pH maximum. |
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| Keywords: | Dissolved oxygen oxygen maximum pH the Great Ghost Lake Warmsan Divine Lake |
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