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分别在2010年9月(暖季)和2011年3月(冷季),选取乌江渡水库网箱养鱼区和距离网箱100～200m的对照区(库心),对水体不同形态汞及其他相关参数进行了研究,以揭示网箱养鱼对水库汞地球化学行为的影响。结果表明,暖季养鱼区水体总汞含量为(2.04±0.53)ng·L-1,甲基汞含量为(0.146±0.231)ng·L-1,对照区水体总汞含量为(3.33±2.39)ng·L-1,甲基汞含量为(0.380±0.577)ng·L-1;冷季养鱼区水体总汞含量为(3.04±1.53)ng·L-1,甲基汞含量为(0.047±0.028)ng·L-1,对照区水体总汞含量为(3.24±1.23)ng·L-1,甲基汞含量为(0.046±0.013)ng·L-1;养鱼区与对照区总汞含量(n=35,P=0.875)、甲基汞含量(n=35,P=0.091)均无显著差异。结合对养鱼区与对照区水体中其他各参数(总氮、总磷、溶解性有机碳、叶绿素、温度、溶解氧等)综合分析表明,由于水库蓄水与泄水发电对水库水体的扰动及水库自身水体的交换作用导致水体呈混匀状态,网箱养鱼造成的水体甲基化程度差异不显著;而水库水体季节性分层造成的水体底部厌氧和温度的变化是影响水体甲基汞含量及分布的主要因素之一。
In September 2010 (warm season) and March 2011 (cold season), the fish culture area of Wujiangdu reservoir and the control area (100km ~ 200m) Other relevant parameters were studied to reveal the effect of cage fish culture on the geochemical behavior of mercury in the reservoir. The results showed that the total mercury content in the fish in the warm season was (2.04 ± 0.53) ng · L-1, the methylmercury content was (0.146 ± 0.231) ng · L-1, and the total mercury in the control area was 3.33 ± 2.39 ng · L-1, and the content of methylmercury was (0.380 ± 0.577) ng · L-1. The total mercury in the fish culture area was (3.04 ± 1.53) ng · L-1 in cold season, (0.047 ± 0.028) ng · L-1. The total mercury in the control water was (3.24 ± 1.23) ng · L-1 and the content of methyl mercury was (0.046 ± 0.013) ng · L-1. Total mercury content (n = 35, P = 0.875), methylmercury content (n = 35, P = 0.091) showed no significant difference. Comprehensive analysis of other parameters (total nitrogen, total phosphorus, dissolved organic carbon, chlorophyll, temperature, dissolved oxygen, etc.) In the water of the fish culture and control areas shows that due to the disturbance of reservoir water and discharge power to the reservoir water body And the exchange of the reservoir’s own water led to the mixing of the water body, and the difference of the methylation degree of the water body caused by the fish cage was not significant. The change of the anaerobic and temperature at the bottom of the reservoir caused by the seasonal stratification of the reservoir was the influence of the water body A Base mercury content and distribution of one of the main factors.