浙江省长潭水库溶解氧变化特性及其与水温相关性

Study on Changing Characteristics of Dissolved Oxygen and Its Relationship to Water Temperature in Changtan Reservoir in Zhejiang Province

根据2003-2008年浙江省长潭水库多点水质监测数据,探讨了水库水体中溶解氧的时空分布特征及其与水温的相关性.结果表明：长潭水库大部分时间水体中溶解氧都处在Ⅰ类水平.溶解氧浓度以冬季的为最高,夏秋季节比较低.年度间溶解氧水平夏季变化较大,冬季变化相对较小.相关和回归分析表明,长潭水库水体溶解氧浓度与水温呈极显著负相关,并存在DO=9.479-0.074T的线性关系.

Based on annual water quality monitoring data from January in 2003 to December in 2008 inChangtan reservoir in Zhejiang Province,,the spatial and temporal variability of contents of dissolvedoxygen and its relationship to water temperature were analyzed in this water body. The results showedthat DO contents in the water body of Changtan reservoir is in the first grade ,according to the standardfor surface water environment GB3838-2002. There existed obvious seasonal and spatial variability forDO contents in the reservoir. The DO contents in the water body in winter is the highest among that ofall seasons, while in summer and autumn, the DO contents are a little lower than that in winter.Frommany years observation , the tendency showed that the variation of DO contents in the water body inwinter is greater than that in winter. The results of the correlation and regression analysis indicated thatthere existed very significant negative correlation between DO and water temperature （ R = 0. 348 , p =0. 000） , and the linear relationship was DO=9.479-0.074T .