【摘要】 研究了密云水库在2001年一个完整水文年的水体地球化学特征。结果表明:该水库水质清澈,透明度平均为2.54m,pH平均值为8.81;水中溶解氧丰富,平均为6.98mg/L;有机物耗氧量平均为2.07mg/L;平均矿化度为246.97mg/L,水型属重碳酸盐类、钙组Ⅱ型水(CCaⅡ)。水体中的主要生物营养元素氮含量较高,总氮平均为0.96mg/L,磷含量较低,总磷平均为0.025mg/L。水库氮、磷浓度比为38.4∶1,显示磷为该水体生物生产力的主要限制性营养元素。水体中重金属铬、镍的含量变化特征反映了原始老变质基岩成分的有关特点;而重金属铁、镉、铅、汞、砷的含量变化规律则显示密云水库水体已受到上游流域工业活动的影响。更多还原

【Abstract】 Geochemical characteristics of water body in Miyun Reservoir during 2001 are studied in this paper. The results show that Miyun Reservoir had good water quality with following water quality parameters: transparency: 2.54 m, pH=8.81; average dissolved oxygen: 6.98 mg/L; mean total ionic amounts: 246.97 mg/L; value of total ionic amounts: 2.07 mg/L; average content of TN:0.96 mg/L; contents of TP: 0.025 mg/L; N/P ratio: 38.4∶1 (means that phosphorus is the major nutrient element limiting biological productivity). The type of the water belongs to CCaⅡ. The contents of heavy metals such as Cr and Ni in water body mark component changes of original metasediment in Miyun Reservoir. The contents of different heavy metal such as Fe, Cd, Pb, Hg and As show that the water body quality of Miyun Reservoir is affected by industrial mining activities in upper region.更多还原