三湖连江水库水化学特征

HYDROCHEMICAL CHARACTERISTICS OF SANHULIANJIANG RESERVOIR

  • 摘要: 总结了1987年4月至1989年10月三湖连江水库水化学特征,季节变化及其年际变动,结果表明:该水库水质清澈,透明度平均为313cm,pH值平均为7.8,水呈中性,溶解氧丰富平均为8.81mg/L;矿化度平均为121.82mg/L,水型属重碳酸盐类,钙组Ⅱ型水(CⅡCa);水中主要营养元素氮含量高,总氮平均为1.38mg/L,磷含量低,总磷平均为0.022mg/L,氮和磷比为62.7:1,表明磷是水体生物生产力的主要限制性营养元素。多数理化组分周年中出现明显的季节变化,和在平面分布上差异显着,多数理化组分年际变化不明显。

     

    Abstract: This paper presents physicochemical properties of water and their seasonal changes during April,1987-October,1989, in Sanhulianjiang Reservoir.The result are summarized as follows(data as means): 1. The normal conditions of water quality were:Water temperature-18.5,Secchi transparency(cm) 313,pH value-7.80,conductivity(us/cm)-129,dissolved oxygen(mg/ L) 8.81,chemical oxygen demand(mg/L) 2.43,hardness(Germany degree) 3.79,alkalinity(as CaCO3,mg/L) 62.56. 2. Main ionic contents(mg/L)were:calcium-1960,magnesium-3.73,bicarbonate(carbonate) 76.55,sulphate-9.71,chloride-4.77,total ionic amounts-121.82,the water type belongs to CCaⅡ. 3. The contents of main nutrient elements(mg/L)were:nitritenitrogen-0.007,nitrate nitrogen 0.131,ammonia nitrogen-0.379,total nitrogen-1.38,phosphate-0.006,total phosphorus 0.022,silica-2.12. 4. There were marked seasonal changes in most physicochemical components in the water. Also,there were conspicuous differences in horizontal distribution of most physicochemical components.The differences of most physicochemical components were inconspicuous in different years. 5. Sanhulianjiang Reservoir has good water quality and high potential for fish development. However,the N/P ratio was 62.7:1,which means that phosphorus was the major nutrient limiting biological productivity.

     

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