大亚湾养殖区营养盐状况分析与评价

Analysis and evaluation trophic status in aquaculture areas of Daya Bay

研究了1997年春季大亚湾大鹏澳海域及1997～1998年度和1998～2000年春季澳头海域营养盐及其他水化参数的变化。大鹏澳和澳头海域平均DIN含量分别为52.37、115.07μg/L,DIP为5.33、9.19μg/L,DSi为351.81、1068.3μg/L。大鹏澳海域营养状态质量指数(NQI)值多在1.0以下,平均0.97;1998～2000年春澳头海域NQI平均值分别为1.94、1.63、1.51。从1997年澳头海域水质状况来看,春夏季节水质污染程度较高,秋冬季节较低。研究结果表明:大亚湾海域整体水质良好,而且大鹏澳海域水质优于澳头海域,但近岸海区和养殖区已受到一定程度的污染,水质已接近中营养型水平。

Variations of nutrient contents, other chemical factors and phytoplankton community structure were investigated in Dapengao area in the spring of 1997 and Aotou Area form 1997 to 1998 and three springs from 1998 to 2000 of Daya Bay, the South China Sea. The average values of DIN, DIP and DSi in Dapengao area and Aotou area were 52.37 and 115.07μg/L N, 5.33 and 9.19μg/L P, 351.81 and 1068.3μg/L Si respectively. The values of Nutrient Quality Index (NQI) were below 1.0 in the most stations in Dapengao area with an average of 0.97, while the values NQI in Aotou area were 1.94, 1.63 and 1.51 respectively in the springs from 1998 to 2000. The water qualities were better in autumn and winter, while worse in spring and summer. Generally, the water quality was well in Daya Bay, and much better in Dapengao area than Aotou area. However, inshore and culture areas have already been polluted to some extent recently.