洱海溶解氧、五日生化需氧量变化趋势及影响因素分析  

Analysis on the Change Trend and Influencing Factors of Dissolved Oxygen and Five-day Biochemical Oxygen Demand in Erhai Lake

作　　者：周字能 ZHOU Zi-neng(Dali Ecological Environment Monitoring Station,Department of Ecology and Environment of Yunnan Province,Dali Yunnan 671000,China)

机构地区：[1]云南省生态环境厅驻大理州生态环境监测站,云南大理671000

出　　处：《环境科学导刊》2021年第1期25-29,共5页Environmental Science Survey

摘　　要：通过分析2015—2019年洱海水体中的DO、BOD 5浓度变化,研究水体中DO、BOD 5与温度、降雨之间的相互关系,结果表明:洱海水体中能被好氧微生物分解的有机污染物含量低,2015—2019年洱海BOD 5值在1.0~3.2mg/L,BOD 5表现出很强的稳定性,与温度及降雨的相关性很小;2015—2019年洱海水体DO月均浓度值5.47~8.47mg/L,季度平均值在5.98~8.47mg/L,年度平均值在6.86~7.44mg/L,当温度波动明显时,DO与温度呈现出明显的负相关性,但降水对洱海DO的影响不大。大理州委、州政府在保护和治理洱海“八大攻坚战”中构建的五大工程体系,是洱海BOD 5保持Ⅰ类水质,DO保持Ⅱ类水质的重要因素。By analyzing the concentration changes of DO and BOD 5 in Erhai Lake from 2015 to 2019,the relationship between DO,BOD 5 and temperature and rainfall was studied.The results indicated that the content of organic pollutants that can be decomposed by aerobic microorganisms was low in Erhai Lake.The BOD 5 value of Erhai Lake from 2015 to 2019 was between 1.0~3.2mg/L,and BOD 5 showed strong stability.It was not affected by temperature and rainfall.From 2015 to 2019,the monthly average concentration of DO in Erhai Lake was 5.47~8.47mg/L,the quarterly average was 5.98~8.47mg/L,and the annual average was 6.86~7.44mg/L.When the temperature fluctuated obviously,the relationship between DO and temperature was obviously negative,but the impact of rainfall on DO was not significant.The five engineering systems constructed by Dali Prefecture Party committee and state government in the“eight key battles”of Erhai Lake Protection and governance are important factors for Erhai Lake to maintain BOD 5 at class I water quality and DO at class II water quality.

关 键 词：DO BOD 5 变化趋势 影响因素 洱海 

分 类 号：X52[环境科学与工程—环境工程]