企沙半岛邻近海域春季水质营养状况分析

Analysis of Water Quality and Nutriture in the Adjacent Waters of Qisha Peninsula in Spring

根据2013年4月对企沙半岛邻近海域调查结果,分析了该区域春季水质营养状况。结果表明,表层海水中DIN、DIP和DSi浓度范围分别为0.077～0.760 mg/L、0.002～0.130 mg/L和0.267～0.928 mg/L,企沙半岛邻近的东部和西部海域DIN、DIP和DSi均高于南部海域,且东部海域均呈现西南方向递减,西部海域均呈现东南方向递减。从营养盐结构分析,对照■等提出的营养盐化学计量限制标准,春季企沙半岛邻近海域,磷是浮游植物生长的潜在限制因子。通过有机污染指数和营养状态指数分析,整个调查海区水质已开始受到污染并处于贫营养水平状态,但局部区域已出现中度和严重污染状况,营养状态呈现中营养和富营养水平。

The nutriture and water quality in the adjacent waters of Qisha Peninsula in spring was analyzed according to the investigation result in April,2013.The results showed that the concentration ranges of dissolved inorganic nitrogen(DIN),dissolved inorganic phosphorus(DIP) and dissolve silicate DSi in surface seawater were 0.077~0.760,0.002~0.130 and 0.267~0.928 mg/L,respectively.The horizontal distributions of DIN,DIP and DSi were higher in the eastern and western waters of Qisha Peninsula than those in the southern waters.The nutrients of eastern and western waters displayed decreasing trends toward southwest and southeast,respectively.By analyzing the nutrition structure and comparing with limit standard of chemical measure for the nutrients,it is concluded that phosphate should be a potential factor to limit phytoplankton growth in the adjacent waters of Qisha Peninsula in spring.The water quality was analyzed by using pollution index and eutrophication index.The results indicated that water quality of the whole surveyed area has been polluted and is in an oligotrophic condition,and the water quality in some areas has become moderately and severely polluted with nutriture displaying mesotropher and eutrophication level.