Su Yin, Ling Bingze, Ren Jintong
College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, China.
Guizhou Key Laboratory of Plateau Wetland Conservation and Restoration, Guizhou University of Engineering Science, Bijie, China.
PLoS One. 2025 May 7;20(5):e0321562. doi: 10.1371/journal.pone.0321562. eCollection 2025.
This study aimed to analyze the spatial and temporal variations in water quality status and eutrophication level of Lake Aha, influenced by human activities and seasonal changes. Ten indicators were sampled and analyzed at seven sampling points in Lake Aha in different seasons and vertical layers. The eutrophication level and water quality status were evaluated using the Trophic Level Index (TLI) and Water Quality Index (WQI). Results showed that the average TLI and WQI values during the wet season (July) were 31.06 and 92.14, respectively, compared to 28.64 and 109.14 during the dry season (April). Eutrophication was more severe in the wet season than in the dry season, whereas water quality was poorer in the dry season than in the wet season. The main factors driving these patters were temperature and precipitation, respectively. Spatially, the northern part of Lake Aha exhibited higher eutrophication levels than the southern part, while water quality was better in the south than in the north, largely due to the impact of human activities. Significant differences in eutrophication levels and water quality were observed among the seven sampling points, though variations across vertical layers were minimal. Strong positive correlations between key indicators-such as CODMn, TP, and Chl-a-highlighted interdependencies affecting overall water quality, with these factors identified as critical drivers of TLI and WQI. These findings indicate the important impacts of seasonal changes and human activities on the water quality of Lake Aha and suggest the need for targeted water pollution management strategies.
本研究旨在分析受人类活动和季节变化影响的阿哈湖水质状况和富营养化水平的时空变化。在阿哈湖不同季节和垂直层次的七个采样点采集并分析了十个指标。采用营养状态指数（TLI）和水质指数（WQI）对富营养化水平和水质状况进行评估。结果表明，雨季（7月）的平均TLI和WQI值分别为31.06和92.14，而旱季（4月）为28.64和109.14。富营养化在雨季比旱季更严重，而水质在旱季比雨季更差。驱动这些模式的主要因素分别是温度和降水。在空间上，阿哈湖北部的富营养化水平高于南部，而南部的水质优于北部，这主要是由于人类活动的影响。七个采样点的富营养化水平和水质存在显著差异，尽管垂直层次间的变化很小。关键指标如化学需氧量、总磷和叶绿素a之间的强正相关突出了影响整体水质的相互依存关系，这些因素被确定为TLI和WQI的关键驱动因素。这些发现表明了季节变化和人类活动对阿哈湖水质的重要影响，并表明需要制定有针对性的水污染管理策略。
