大亚湾养殖海域营养盐的周年变化及其来源分析

Annual variation and analysis of nutrients in aquaculture area of Daya Bay

根据2002年6月～2003年6月对广东大亚湾大鹏澳海区进行的每月1次大面调查的资料,对该海域的无机氮、磷酸盐及硅酸盐的周年变化及其来源进行分析.结果表明,无机氮含量范围是0.0103～0.5646 mg/L,各区域最大值都出现在9月份.PO4-P含量的范围是0～0.0129 mg/L,核电站排水区的含量最大值出现在4月,其他三个区域的含量最大值出现在9月份. SiO2-Si的含量范围是0.0204～1.4706 mg/L, 河口区的含量从6～11月都高于其他三个区域, 养殖区及核电站排水区的含量全年变化幅度很小.调查海域无机氮来源于养殖区本身和地表径流,磷酸盐来源于养殖区本身,而硅酸盐则来源于地表径流.P是大鹏澳海域浮游植物繁殖生长的主要限制因子,N次之,Si是本海域最为丰富的营养盐.

The continuous survey was carried out from June 2002 to June 2003 monthly in sea area of Dapeng＇ao in Daya Bay. Annum variation characteristics and sources of inorganic nitrogen, phosphor and silicate were analyzed. The result shows that the range of concentration of inorganic nitrogen was 0. 0103 - 0. 5646 rag/L, and the highest concentration of inorganic nitrogen was in September, and the variations range was big. The range of concentration of PO4-P was 0 ～ 0.0129 mg/L , and the highest concentration of PO4-P was in April at the nuclear power plant drainage, and in September at three other areas. The range of concentration of SiO2-Si was 0,0204 - 1.4706 mg/L, The concentration of SiO2-Si at outfall area was higher than at three other areas from June to November. The variations range of concentration of SiO2-Si was smaller at aquaculture area and nuclear power plant drainage. The source of inorganic nitrogen is aquaculture area itself and surface runoff and phosphor aquaculture area itself. But, the source of silicate is the surface runoff. The influence factors on the phytoplankton in the sea area, P was first and N second. Si was the richest nutrient salt in the sea area.