三都澳四个水产养殖点水质周年变化分析

2011年8月-2012年7月对三都澳四个水产养殖点的营养盐(N、P)、溶解氧(D0)、化学需氧量(COD)、pH值进行了分析,结果表明,无机溶解氮(DIN)组成结构在春、秋、冬季节中主要以NO3-N为主,其次为NH4-N和NO2-N.夏季营养盐结构,NO3-N所占比例明显减低,NO2-N所占比例超过NH4-N.营养盐NO3-N浓度的周年变化为:冬季＞秋季＞春季＞夏季；NO2-N的浓度为:夏季＞秋季＞春季＞冬季；NH4-N浓度:夏、秋偏低,春、冬较高；P04-P的浓度:冬季＞秋季＞夏季＞春季.水体中DO浓度的周年变化为:冬季=春季＞秋季=夏季.pH变化的周年变化为:春季＞冬季＞夏季＞秋季.三都澳四个养殖点周年属于中度营养状态.

Annual variation analysis of the water quality elements in four aquaculture points in Sandu＇ao

According to the analysis of the nutrients （N, P）,dissolved oxygen （DO）,chemical oxygen de- mand（COD） and pH value in four aquaculture points in Sandu＇ao from August 2011 to July 2012,we found that the mainly inorganic composition of the dissolved nitrogen（DIN） is NO3-N in the spring, autumn and winter, fol- lowed by NH4-N and NO2-N. Nutrient structure changed in the summer,the proportion of the NO3-N reduced remarkably and the proportion of the NO2-N exceed NH4-N. The annual variation of the nutrients of the NO3-N concentration： winter 〉 autumn 〉 spring 〉 summer,the concentration of NO2-N： summer 〉 autumn 〉 spring 〉 winter;the concentration of the NH4-N is lower in summer and autumn, higher in spring and winter; but for the PO4-P,the concentration in winter is equal to that in spring and higher than autumn or summer. The annual variation of the water column DO value as follows： winter = spring 〉 autumn = summer, the annual variation of pH change is： spring 〉 winter 〉 summer 〉 autumn. All these data indicated that the moderate nutritional status of the four breeding points anniversary in Sandu＇ ao.