Study on the variation of dissolved oxygen and its influencing factors in Didu section of Rongjiang River,Guangdong
Based on the rainfall and water quality monitoring data of the Didu section of the Rongjiang River downstream over the past two years,this study analyzed the variation patterns of dissolved oxygen(DO)at different temporal scales.By integrating the water quality monitoring data from the upstream Donghu section,methods such as Pearson correlation analysis and multiple linear regression analysis were employed to examine the impact of various environmental factors on the DO at the Didu section.The results indicated that due to the influences of temperature,light and pollutants,the DO at the Didu section exhibited characteristics of being higher during the day and lower at night;higher in spring,autumn,winter,and lower in summer;higher during the dry season,and lower during the wet season.There was a significant positive correlation between the DO at the Didu section and the pH,electrical conductivity(P＜0.01)at the same section,and it had a strong negative correlation with water temperature.The impact of pollutant input along the river was greater during the wet season.The pH at the Didu section was the primary factor affecting the DO variation during both wet and dry seasons,explaining 48.7％and 45.1％of the overall DO changes,respectively.The electrical conductivity at the Didu section,total nitrogen at the Donghu section,and DO at the Donghu section also had certain influences on the DO at the Didu section.The DO concentration at the Didu section generally decreases with the increase of rainfall intensity,with the largest decrease observed during heavy rain,reached 41.95％.
万方数据
维普
