The second investigation of Lake Puma Yum Co located in the Southern Tibetan Plateau,China |
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Authors: | Tetuo Murakami Hisayoshi Terai Yoko Yoshiyama Takafumi Tezuka Liping Zhu Tetsuya Matsunaka Mitsugu Nishimura |
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Institution: | (1) Department of Life Environmental Science, Nagoya Women’s University, 3-40 Shioji-cho, Mizuho-ku Nagoya, 467-8610, Japan;(2) Department of Environmental Biology, Chubu University, Kasugai, Japan;(3) Nagoya Bunri University, Inazawa, Japan;(4) Institute of Geographical Sciences and Natural Resources Research, Beijing, China;(5) Department of Marine Science, Tokai University, Shizuoka, Japan |
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Abstract: | Limnological features of Lake Puma Yum Co, a typical alpine lake located at the altitude of 5030 m in the Tibetan Plateau,
China, are described based on the findings of the second expedition in September 2004. The lake surface is about 280km2 and maximal depth is 65 m. Total inflow just after the rainy season was estimated to be about 860 000m3 day−1, and the lake water was drained from a newly excavated channel at a rate of 960 000m3 day−1. We may have to expect undesirable lowering of the water level by this new drainage, especially in the dry season. Thermocline
developed from 20 to 30 m depth, and the euphotic zone reached the 50 m depth. Dissolved oxygen in surface water was supersaturated
as in productive lakes, although there were no large point and nonpoint sources of nutrient in the catchment. Vertical distribution
of phytoplankton biomass and primary production suggested the presence of photoinhibition. What should be noted about the
flora and fauna is that a Chara zone and a shell zone were distributed at about 30 or 40 m of depth. |
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Keywords: | Alpine lake Lake Puma Yum Co Primary production Tibetan Plateau Water balance |
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