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首页> 外文期刊>Limnology >Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia
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Spatio-temporal variations in underwater light climate, thermal and chemical characteristics of the tropical soda lake, Lake Shala, Ethiopia

机译：埃塞俄比亚沙拉湖热带苏打湖的水下光气候，热化学特征的时空变化

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摘要

Although soda lakes are highly sensitive to environmental changes and suited for the study of vital ecological processes owing to their unique biological and physicochemical properties and closed nature, there are limited studies on and knowledge of their basic ecology. In this study, temporal and vertical fluctuations of underwater light climate, thermal and chemical characteristics of the soda lake Lake Shala were studied using data collected on 11 occasions over an annual cycle. Measured parameters of underwater light climate depicted light-limited conditions with slight temporal variations, which are attributable to non-biological turbidity and high water column mixing depth. Its water column exhibited superficial thermal stratification with turbulently mixing and well-oxygenated conditions. Alkalinity, pH and conductivity were high but exhibited small temporal and vertical variations. These parameters increased slightly during the rainy season, possibly due to saline inflows associated with precipitation. Most of the major algal nutrients showed small temporal and vertical variations. NO3 (-) and NH3 in the euphotic zone were often very low or undetectable, while soluble reactive phosphate and total phosphorus were very high throughout the study period. The concentration of SiO2 was remarkably low, which was probably associated with biological uptake and some chemical processes within the lake. In general, physicochemical parameters of Lake Shala exhibited small temporal and vertical variations despite the current threat of environmental degradation, possibly because of the high resilience of the lake associated with its low productivity and voluminous nature.
机译：尽管苏打湖由于其独特的生物学和理化特性以及封闭的自然环境而对环境变化高度敏感，并且适合于重要的生态过程的研究，但对其基本生态学的研究和知识有限。在这项研究中，使用一年周期内11次收集的数据研究了苏打湖Shala湖的水下光气候的时空和垂直波动，热化学特征。水下光气候的测量参数显示了受光限制的条件，并具有轻微的时间变化，这归因于非生物浊度和高水柱混合深度。其水柱在湍流混合和充氧条件下表现出表面热分层。碱度，pH和电导率很高，但在时间和垂直方向上变化较小。在雨季期间，这些参数略有增加，可能是由于与降水相关的盐分流入。大多数主要藻类营养素显示出较小的时间和垂直变化。在整个研究期间，常绿区中的NO3（-）和NH3通常很低或无法检测到，而可溶性反应性磷酸盐和总磷非常高。 SiO2的浓度非常低，这可能与湖泊中的生物吸收和某些化学过程有关。通常，尽管当前存在环境恶化的威胁，但沙拉湖的理化参数在时间和垂直方向上均表现出较小的变化，这可能是由于该湖的高复原力及其低生产率和大自然所致。

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