哑铃湾网箱养殖区底层水中各种形态P的含量和季节变化

Content and seasonal variation of various forms of phosphorus in bottom water in cage culture area,Yaling Bay

根据2002年4月～2003年1月在哑铃湾网箱养殖区的水化学现场调查,分析了底层海水中P的形态构成以及各种形态P的时空分布特征,讨论了各种形态P之间的线性相关性以及影响溶解态P(DTP)和溶解无机P(DIP)的环境因素,比较了网箱区与附近海区溶解态P的含量差异.结果表明:养殖区底层海水中的P主要以DTP形态存在,夏季DTP主要以DOP形态存在,春、秋、冬季主要以DIP形态存在;网箱养殖使底层海水中各形态P都有不同程度的增加,DIP和DTP的增加更明显,短期养殖的影响较小,长期养殖的影响明显,停养后仍对水体产生一定影响;网箱养殖对养殖区外水体中溶解态P含量的影响范围有限,对网箱区内的影响明显.

Based on field investigation in the cage culture area, Yaling Bay, from Apr 2002 to Jan 2003, the percentages of various forms of phosphorus in bottom water of cage culture area in total phosphorus （TP） and total dissolved phosphorus （DTP） were calculated. The seasonal and spatial variation of various forms of phosphorus were analyzed. The linear relationships among the various forms of phosphorus were discussed. The environmental factors which affected DTP and DIP were analyzed. The content of dissolved phosphorus in bottom water in cage and near area were compared. The results showed that DTP was the main form in TP, and the main form in DTP was DOP in summer, while was DIP in other seasons. The contents of various forms of phosphorus in bottom water were increased in cage, especially DIP and DTP. The impact on various forms of phosphorus was increased markedly with the time. The impact outsite the cage area was also limited. The range of the impact on dissolved phosphorus in bottom water was obvious in the cage area.