关键词: 养殖库区, 水体, 氮, 时空变化, aquaculture reservoir, water, nitrogen, temporal and spatial variations

Abstract: Monthly samplings (15 selected sites) were determined regularly from March 2014 to February 2015 to study the characteristics of spatial and temporal distributions of water nitrogen in main aquaculture reservoir of Shuikou. The results indicated that the concentrations of TN,NH3-N,NO2-N in main aquaculture reservoir of Shuikou were averaged at 1.38～2.15 mg/L, 0.24～0.53 mg/L and 0.03～0.06 mg/L. The concentrations of nitrogen in different forms were influenced obviously by seasons. The total nitrogen concentration was higher in winter. In addition to the Taiping aquaculture reservoir, the concentrations of ammonia nitrogen were higher in spring and ranged at 0.466~ 0.596 mg/L. The variations in nitrite nitrogen concentration were small, ranged at 0.009 ~ 0.031 mg/L. There has a certain correlation on nitrogen in different forms at different aquaculture reservoir areas. Total nitrogen and ammonia nitrogen, nitrate nitrogen had no significant correlation in Xiongjiang and Taiping. Negative correlation between total nitrogen and ammonia nitrogen, nitrate nitrogen was found only in aquaculture water of Huantian and Wankou. The negative correlation between ammonia nitrogen and nitrate nitrogen was significant in Youxikou.