哑铃湾网箱养殖区底层水营养盐的分布与评价  

Distribution and Assessment of Dissolved Nutrients in Bottom Water at Cage Culture Area in Yaling Bay

作　　者：韦献革 温琰茂[1] 王文强[1] 贾后磊[1,2] 徐昕荣[1] 

机构地区：[1]中山大学环境科学系 [2]国家海洋局,南海海洋勘察与环境研究院,广东广州510300

出　　处：《中山大学学报（自然科学版）》2005年第4期115-119,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(40071074)广东省环保局科技研究开发项目(2000262424027)

摘　　要：根据2002年4月至2003年1月在哑铃湾网箱养殖区水化学的现场调查,分析了网箱区和对照点底层海水中溶解无机氮磷的含量差异和季节变化特征,讨论了溶解态无机氮磷与环境因子的线性相关性,并对哑铃湾网箱养殖区底层海水的富营养化水平进行评价。结果表明:哑铃湾网箱养殖对底层海水pH值、DO、COD、NO2--N和NO3--N的影响不明显,对NH4+-N、DIN和PO43--P的影响相对较大,短期养殖的影响较小,长期养殖的影响明显。溶解无机氮磷原子比值降低,使该海区营养盐结构的改变,对赤潮发生带来一定风险。季节上春、秋季的影响更明显。哑铃湾养殖区底层海水在春、秋两季已达到富营养化水平,养殖期越长,富营养化程度越高。Based on the field investigation over bottom water at cage culture area, Yaling Bay from April 2002 to January 2003, the concentration difference and seasonal change in dissolved nitrogen and phosphorus of bottom water at cage culture area and reference station were analyzed. The dissolved nitrogen and phosphorus concentrations were linearly correlated with environment factors; and the eutrophication level of bottom water at cage culture area was assessed. The results showed that pH, DO, COD, NO2^--N and NO3^--N in bottom water were not markedly affected by culturing, while NH4^＋-N, DIN and PO4^3--P were more obviously influenced, and were influenced severer by long-term culture than by short-term culture at the cage culture area of Yaling Bay. The decrease in N ： P ratio contributed to the occurrence of red tide at the cage culture area. The bottom water was eutrophic in Spring and Autumn, and the degreeof eutrophication was positively correlated with culturing period.

关 键 词：氮 磷 网箱养殖 底层海水 哑铃湾 

分 类 号：X171.5[环境科学与工程—环境科学]