• 关键词：东平湖  水质分析  流域汇流  水体理化性质

• 基金项目：国家自然科学基金重点项目-山东联合基金项目（No.U1906219）

• 李琦
• 中国环境科学研究院，北京 100012

• 张秋英
• 中国环境科学研究院，北京 100012

• 张依章
• 中国环境科学研究院，北京 100012

• 吴春辉
• 泰安市生态环境局东平分局，泰安 271500

• 柏杨巍
• 中国环境科学研究院，北京 100012

• 栗照鑫
• 中国科学院地理科学与资源研究所，北京 100101

• 王健祺
• 中国科学院地理科学与资源研究所，北京 100101

• 摘要：目前，我国河流型湖泊水环境功能严重退化，水生态平衡逐渐失调.本研究通过对东平湖及其流域内水体酸碱度（pH）、溶解氧（DO）、 电导率（EC）和氧化还原电位（ORP）的分布情况进行调查分析，评价东平湖水质现状，并从多角度分析污染成因.结果显示，东平湖水环境指标pH、EC、DO和ORP的空间分布差异相对较小，变异系数分别为0.11、0.11、0.25和-0.12.湖泊中心区pH值小于河流入湖口及河流各点，高值点主要集中于东平湖东北部及河流下游，与DO、ORP的空间分布特征相反.水体流动性、光合作用强度的差异是导致流域内DO含量分布不均的主要因素，低DO含量使湖泊水体氧化还原体系向着还原反应进行并降低水体ORP.东平湖流域内ORP平均值仅为-656.09 mV，高值点主要 集中于湖泊南部、东部、北部，河流上下游之间未表现出较为明显的变化趋势，表明“南水北调”东线工程来水对东平湖水体产生了较明显的 影响.本研究对东平湖流域内水环境现状评价与生态修复具有重要参考意义.

• Abstract：Water environment function and the ecological balance of lakes in China is seriously destroyed. This study investigated the distribution of pH， EC， DO and ORP in Dongping Lake basin， assessed the overall situation of water quality in Dongping Lake and analyzed the water pollution level and its formation reasons from multiple perspectives. The results showed that the difference of spatial distribution of four conventional water environment indexes： pH， EC， DO and ORP of Dongping Lake were relatively small， and the variation coefficients were 0.11， 0.11， 0.25 and -0.12， respectively. The pH values in the central area of the lake were lower than those in the lake entrance and the river， and the points with high values were mainly concentrated in the northeast of Dongping Lake and the lower reaches of the river， which is contrary to the spatial distribution characteristics of DO and ORP. The differences in water fluidity and photosynthetic intensity were the main factors leading to the uneven distribution of DO in the Dongping Lake basin. Low DO concentration made the redox system of water moved towards reduction reaction， resulted in a low average ORP of -656.09 mV， far lower than the surface runoff（-21.5 mV）. The greater ORP points in the Dongping Lake basin were mainly concentrated in the south， east and north of the lake， and there was no obvious change trend between the upstream and downstream of the river， indicating that the incoming water from the eastern route of the South-to-North Water Transfer Project had a significant impact on the water body of Dongping Lake. This study has important reference significance for the evaluation of water environment status and ecological restoration in Dongping Lake basin.

• Key words：Dongping Lake  water quality analysis  watershed concentration  physicochemical properties of water

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