摘要 巴松措是藏东南面积最大的冰川堰塞湖,是温带半湿润高原深水型湖泊。2019年7月,对巴松措暖季垂直剖面水温分层的基本特征、水体理化性质与水温分层的响应关系进行了分析。结果表明,巴松措暖季垂直剖面水温分布具有明显的深水湖泊分层特征。其表层0.5 m至水深20 m处为变温层,水温在9.4~13.9℃;水深20~40 m为温跃层,水温在6.9~9.4℃,平均强度为0.12℃/m;水深40 m以下为等温层,水温变幅在6.4~6.8℃,平均水温为6.5℃。巴松措湖底水温在6℃左右,与湖泊表层最大温差为7.5℃。水体的pH、溶解氧和浊度呈现与水温近似相同的层次结构与分层现象,而总溶解盐、电导率和矿化度这三者在垂向变化上具有相同的变化趋势,且在温跃层下随水深的增加而升高。巴松措暖季水体的分层,特别是温跃层的存在导致了湖水各层次水体理化性质的差异。 Basong Lakeis a largest glacier barrier lake in the southeastern Tibet.Characteristics of water temperature stratification in the vertical profile of the lake in warm season was studied in July 2019.Corresponding relationship between water temperature and the water physio-chemical properties was also evaluated.The results showed that in the warm season the vertical profile water temperature distribution in the Basong Lake has obvious stratification characteristics as a deep-water lake.Under the lake surface layer,from 0.5 m to 20 m depth was a thermophere and,the water temperature was between 9.4~13.9℃.From 20~40 m depth was thermocline and the temperature ranged from 6.9℃to 9.4℃,with an average strength of 0.12℃/m.Under the depth of 40 m,the water temperature slightly varied between 6.4℃to 6.8℃(average:6.5℃).It was so called constant temperature layer.The bottom water temperature of the lake was about 6℃and the maximum temperature difference between the lake surface and the bottom was 7.5℃.The lake water pH,DO and turbidity presented a similar hierarchical structure and stratification as the water temperature.In addition,TDS,EC and salinity of the lake water showed a same variation trend in vertical profile.Namely,the value of these three water quality parameters increased with a increasing water depth under the thermocline.The present of the themocline in the Basong Lake in warm season was the major controlling factor effecting the variations of studied physio-chemical parameters along the vertical profile of the lake.
机构地区 西藏大学理学院
出处 《环境生态学》 2021年第4期37-42,共6页 Environmental Ecology
基金 国家自然科学基金资助项目(21667027,31660620)资助。
关键词 深水湖泊 水温分层 理化参数 巴松措 Deep lake water temperature stratification physical and chemical parameters Basong Lake
