Africa Center of Excellence for Water Management, Addis Ababa University, Addis Ababa, Ethiopia; Department of Biology, Wollo University, Dessie, Ethiopia E-mail:
Africa Center of Excellence for Water Management, Addis Ababa University, Addis Ababa, Ethiopia.
Water Sci Technol. 2024 May;89(10):2703-2715. doi: 10.2166/wst.2024.128. Epub 2024 Apr 24.
The aim of the present study was to evaluate the spatio-temporal variability of various physical and chemical parameters of water quality and to determine the trophic state of Lake Ardibo. Water samples were collected from October 2020 to September 2021 at three sampling stations in four different seasons. A total of 14 physico-chemical parameters, such as water temperature, pH, dissolved oxygen (DO), electrical conductivity, turbidity, alkalinity, Secchi-depth, nitrate, ammonia, silicon dioxide, soluble reactive phosphorus, total phosphorus, chloride, and fluoride were measured using standard methods. The results demonstrated that temporal variation existed throughout the study period. Except for turbidity, the water quality of the lake varied significantly within the four seasons (ANOVA, < 0.05). DO levels decreased significantly during the dry season following water mixing events. Chlorophyll-a measurements showed significant seasonal differences ranging from 0.58 μg L in the main-rainy season to 8.44 μg L in the post-rainy period, indicating moderate algal biomass production. The overall category of Lake Ardibo was found to be under a mesotrophic state with medium biological productivity. A holistic lake basin approach management is suggested to maintain water quality and ecological processes and to improve the lake ecosystem services.
本研究旨在评估 Ardibo 湖水质的各种物理和化学参数的时空变异性，并确定其营养状态。于 2020 年 10 月至 2021 年 9 月，在四个不同季节的三个采样点采集水样。共测定了 14 种理化参数，如水温、pH 值、溶解氧（DO）、电导率、浊度、碱度、透明度、硝酸盐、氨氮、二氧化硅、可溶性活性磷、总磷、氯和氟化物，采用标准方法。结果表明，整个研究期间存在时间变化。除浊度外，四个季节的湖水水质差异显著（ANOVA， < 0.05）。混合水事件后，旱季 DO 水平显著下降。叶绿素-a 测量显示出显著的季节性差异，范围从主雨季的 0.58 μg/L 到后雨季的 8.44 μg/L，表明中等藻类生物量的产生。Ardibo 湖的整体类别被发现处于中营养状态，具有中等生物生产力。建议采用整体湖泊流域管理方法，以维持水质和生态过程，并改善湖泊生态系统服务。
