Effect of Human Activity on Oligotrophic Lake and its C onservation

人类活动对寡营养湖泊的影响及其保护

• 批准号: 11680564
• 负责人: TACHIBANA Harukuni
• 金额: $ 2.5万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680564/
• 关键词: Oligotrophic Lake; Chlorotec; Water Quality; Nutrients; Transparency; Conservation; Lake Kuttara; Lake Mashu; 水質; 生態系; 降雨; 流域環境; 人間活動; 影響評価; 小環境保全

Hokkaido, the land blessed with nature has many oligotrophic lakes. The state of such lakes is changing by development of the area. This report means to show how human activities effect on water of Lake Kuttara and Mashu, the representative ologotrophic lake of Hokakido. Especially we analyzed the behavior of nutrients of the lakes. Besides that, we proposed the way to manage water flow into the lakes to keep them natural depending on the data.In 1999, we investigated the actual conditions of lake water quality and rivers flowing into lake, and in 2000, we made more precise water quality research on lake Kuttara. And we also studied load-production mechanism of nutrients and other pollution matters and management of catchments area to keep oligotrophic lakes in desirable state.【Results】(1999)We grasped general water quality of Lake Kuttara and Lake Mashu by our survey.. After the collection of data in the past, we could make clear the trend of water quality of Lake Kuttara. As Chlorotec(water quality monitoring instrument), which we purchased in 1999, did not work well, we made some improvements and at the end of the year, we could make use of it.(2000)We researched on Lake Kuttara for 7times, from May to October, and on Lake Mashu, once in August with Ministry of Environment. Especially on Lake Kuttara, we made the research in rainy season in August successively. We took water samples from 9 layers, at the deepest, 146m. From the research, we saw nitrate-nitrogen increases a little recently but transparency did not change so much. As the concentration of nitrate nitrogen is more than in Lake Mashu, it is necessary to manage the catchments area. And from the chlorophyll range in Lake Kuttara, we could find the new concepts about the movement of algae(phytoplankton).

北海道，这片得天独厚的土地上有许多低营养湖泊。随着该地区的发展，这些湖泊的状况正在发生变化。该报告书是为了展示人类活动对北角道代表性生态营养化湖泊库塔拉湖和麻树湖的影响。特别分析了湖泊营养物的变化规律。除此之外，我们还根据数据提出了管理流入湖泊的水流的方法，以保持湖泊的自然。1999年，我们对库塔拉湖的水质和入湖河流的实际情况进行了调查，2000年，我们对库塔拉湖进行了更精确的水质研究。研究了营养物及其他污染物质的负产机制和集水区的治理，以保持湖泊的低营养状态。【结果】（1999）通过调查，掌握了库塔拉湖和马苏湖的水质概况。通过以往资料的收集，可以明确库塔拉湖水质的变化趋势。由于我们在1999年购买的氯泰克（水质监测仪）工作效果不佳，我们做了一些改进，年底可以使用。（2000） 5月至10月对库塔拉湖进行了7次考察，8月与环境部对马苏湖进行了1次考察。特别是库塔拉湖，我们先后在8月份的雨季进行了研究。我们从9层采集了水样，最深的是146米。从研究中，我们看到硝酸盐氮最近有所增加，但透明度没有太大变化。由于麻叔湖水体中硝酸盐氮浓度偏高，有必要对汇水区进行治理。从库塔拉湖的叶绿素范围可以发现藻类（浮游植物）运动的新概念。