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首页> 外文期刊>Lakes & Reservoirs >Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)
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Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)

机译：阿尔卑斯山南部高海拔湖泊的化学和生物学特征（瑞士拉格托·托菲奥雷）

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摘要

Since 1980, surveys have been performed nearly every three years on approximately 50 small high altitude alpine lakes located in the Swiss part of the Lake Maggiore watershed. On the basis of this information, since 1996 Laghetto Inferiore has been included in the Mountain Lakes Research (MOLAR) project, an extensive European cooperative research project with 23 partners. Laghetto Inferiore is located at 2074 m a.s.l.; its watershed is mainly composed of crystalline silicic rocks; it has a maximum depth of 33 m, and a theoretical renewal time of 41 days. The pH of the water is approximately 5.6; the alkalinity of the surface water is approximately 30 Μmol and that of the bottom water approximately 60 Μmol. Chemical studies were performed on the inputs from atmospheric deposition and the main tributary streams, the lake concentration (on a monthly basis), and the outflow. The results show that the characteristics of summer deposition (rain) differ significantly from those of winter deposition (snow). By means of a budget model it was possible to distinguish between the contribution from atmospheric deposition and the contribution from weathering. Biological studies revealed a considerable variety of phytoplankton species and a scarcity of zooplankton species. The vertical distribution of the main algal species shows a marked vertical stratification, with biomass concentrations higher in the profundal. Along this profile, the species of the same taxonomic class tend to gather in a particular depth band, while the single classes tend to be distributed at different depths, according to their specific light requirements.
机译：自1980年以来，几乎每三年对位于马焦雷湖流域瑞士部分的约50个小型高海拔高山湖泊进行调查。根据这些信息，自1996年以来，Laghetto Inferiore已被纳入Mountain Lakes Research（MOLAR）项目，该项目是与23个合作伙伴进行的一项广泛的欧洲合作研究项目。 Laghetto Inferiore位于2074 m a.s.l .；其分水岭主要由结晶硅质岩组成。它的最大深度为33 m，理论更新时间为41天。水的pH值约为5.6。地表水的碱度约为30摩尔，底部水的碱度约为60摩尔。对大气沉积和主要支流的输入，湖泊浓度（每月）和流出量进行了化学研究。结果表明，夏季沉积（雨）的特征与冬季沉积（雪）的特征明显不同。通过预算模型，可以区分来自大气沉积的贡献和来自风化的贡献。生物学研究表明，浮游植物种类繁多，浮游动物种类稀少。主要藻类的垂直分布显示出明显的垂直分层，其中深部生物量浓度较高。沿着这个轮廓，同一分类类别的物种倾向于聚集在特定的深度带中，而单个类别倾向于根据其特定的光照要求分布在不同的深度。

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