哑铃湾网箱养殖对表层沉积物的污染

Influence of cage farming pollution on superficial sediments at Yaling Bay

分养殖区与非养殖区、养殖网箱及周围海域沉积物,比较研究了哑铃湾网箱养殖对表层沉积物的影响。结果表明,养殖网箱下及养殖区内的沉积物C、N、P和硫化物含量均高于非养殖区,并且养殖年限越长含量越高,沉积物污染越严重,养殖区C、N、P和硫化物平均含量分别比非养殖区高1.23—2.12、1.33—2.79、3.71—9.99、3.02—11.84倍。对沉积物质量的评价结果显示,养殖网箱下沉积物各项指标均超标,养殖年限越长超标越严重,养殖区内的两站点超标也较严重,S6站点C、N、P和硫化物超标分别高达1.83、6.99、8.66、4.63倍,而对照点和非养殖区的两站点除总氮外,其它指标均未超标。

Influence of cage farming pollution on superficial sediments was investigated at the Yaling Bay by sediment comparison between culture and natural areas, and between areas beneath and adjacent to the cages. The results showed that the average contents of organic matter, TN, TP and sulfide of the sediments in the culture areas were respectively 1.23-2.12, 1.33-2.79, 3.71-9.99, and 3.02 11.84 times higher than those in the natural areas, and the longer the culture time was, the worse the sediment quality was. The assessment of sediment quality according to the concerned standards also showed that the average contents of organic matter,TN, TP and sulfide of the sediments both beneath the cages and in the cul ture areas all exceeded the standards, especially in long term culture areas. The average contents of organ iematter, TN, TP and sulfide in the sediments of culture areas exceeded the standards by 1.83, 6.99, 8.66, and 4. 63 times respectively, whereas those in the sediments of natural areas were all within the standards except TN.