丹江口水库2-甲基异莰醇浓度变化成因和机理分析OA

To strengthen the water quality safety guarantee of the Danjiangkou Reservoir,the variation characteristics of 2-methylisoborneol(2-MIB)concentrations and their driving factors were analyzed based on algal monitoring data throughout 2025.The results indicated that:① 2-MIB concentrations were significantly synchronized with total algal density(AD)over time.During the intensive algal proliferation period(August～September),both variables exhibited pronounced peaks,with maxi-mum 2-MIB levels approaching 30 ng/L in the central area of the Danjiang sub-reservoir,45 ng/L at the 0+900 monitoring site downstream of the dam,35 ng/L at the Taocha Boundary Station,and 25 ng/L in the Liangshuihe-Taizishan section.AD displayed a similar spatial gradient.② The distribution of 2-MIB was jointly driven by two groups of factors:water quality and biological factors directly related to algal metabolism,basic factors associated with nutrients and habitat conditions.2-MIB was highly correlated with algal,water temperature(WT),pH,organic matter and nutrients,with particularly significant relationships observed for chlorophyll-a(Chla),total nitrogen(TN),WT,pH and electrical conductivity(EC).Operational measures such as aeration and ultrasonic algal control could regulate the release process of 2-MIB.