异龙湖水质参数的季节性变化

Seasonal Changes of Water QualityParameters in Lake Yilong

摘要: 本文对2016年9月、10月、11月和2017年1月、3月、5月异龙湖不同湖区的温度(Temp)、叶绿素a(Chl-a)、溶解氧(DO)以及pH的水质参数特征进行分析，结果表明：异龙湖水质最好的是湖西北，坝心与湖心位置水质没有明显差异，主要是由于湖西北水生植物对湖水的净化作用；湖西北部9月、10月水深1m左右开始出现DO骤降现象形成缺氧环境，且不同季节溶解氧降低的深度和幅度各不相同；湖泊富营养化指标中的叶绿素a在异龙湖整个湖体中存在明显的季节性变化。不仅如此，不同湖区有所不同，其中坝心与湖心位置表现为1月浓度达到最大值，湖西北则是9月和10月为最大值；在所监测的月份中，异龙湖pH值的变化是多种因素综合作用的结果，其中水体藻类的浓度对其有主导作用。通过水质参数分析不同湖区水质差异，认为异龙湖水质恶化的主要原因是人类活动影响的结果。所以今后的发展中，必须重视水资源的有效保护和生态环境的修复与重建，充分加强科学监测、科学管理、科学治理，落实可持续发展思想，改善湖泊流域生态环境。

Abstract: Based on the analysis of water quality parameters, including temperature, chlorophyll-a (Chl-a), dissolved oxygen (DO) and pH of the Lake Yilong during September 2016 to May 2017, the water quality and its spatial-temporal variations were discussed. The results showed that the best water quality of the lake appears in northwest of the lake, attributing to the purification of aquatic plants in the area. There is no notable difference between the water quality in the Dam and center of the lake. The appearances of a DO plunge in the northwest of the lake in September and October re-sulted in a hypoxia condition in the lake water, and it was found that the depth and amplitude of this DO reduction varies from one place to another, with the seasonal difference. The Chl-a con-centration in Lake Yilong showed seasonal and spatial changes too. In the center and the Dam area of the lake, the maximum value occurs in January. However, in the northwest of the lake, the maximum value appears in September and October. The variations of pH of the lake water indicated a strong linkage with algae concentrations. Based on the analysis of water quality parameter in different sites of the lake, it was concluded that the main reason for water quality deterioration of Lake Yilong is unreasonable anthropogenic activities in the area. Therefore, it has been suggested that more attentions should be addressed on effective water quality protection and ecological restoration in the future. Most importantly, all the measurements concerning on the lake water utilization and so-called lake environmental protection should be based on the detailed scientific monitoring, administration and application. This is the only way to keep a sustainable development, with improvement of the eco-environmental in the drainage area.