大亚湾大鹏澳网箱养殖海域沉积物中Pb的分布特征

通过4个航次的调查,研究了大鹏澳海水网箱养殖海域沉积物中铅(Pb)的时空分布特征。网箱养殖区沉积物中的Pb含量明显高于贝类养殖区和对照区;网箱养殖区0～15cm层沉积物的Pb含量明显受到环境扰动的影响,呈垂直梯度减少趋势,而对照区沉积物的Pb含量垂直变化不明显;网箱养殖区,贝类养殖区和对照区沉积物的Pb含量均以春、夏季较高,秋季最低;网箱养殖区沉积物的Pb含量高于其它区域。大鹏澳网箱养殖区沉积物中的Pb含量主要受到网箱养殖活动的影响。

Distribution characteristic of Pb in sediments from the cage culture area of Dapeng''''ao Cove in Daya Bay

The spatial and temporal distribution characteristics of Pb in sediments from the cage culture area of Dapeng'ao Cove was studied through four times of investigation.The spatial distribution characteristics showed that the contents of Pb in sediments from cage culture area were significantly higher than that from shellfish culture area and control area.The vertical distribution characteristics showed that the disturbance in the layer from 0~15 cm of hole sediments was more evident and there was a decreasing trend of pb contents in cage culture area,but the vertical variations was not obvious in control area.The seasonal variations showed the similar characteristics in cage culture area,shellfish culture area and control area,and the contents of Pb in sediments were higher in spring and summer and lower in autumn,but the contents in cage culture area were higher than other areas.According to the results above,it was concluded that the content of Pb in the sediment of cage culture area was affected mainly by the activities of cage culture.