大鹏澳网箱养殖海域水质评价及因子分析

Evaluation and factor analysis of water quality of fish cage aquaculture area in Dapengao

根据2001年6月至2002年6月对大鹏澳网箱养殖海域6个航次的水质监测数据,采用有机污染评价指数法对养殖区水质状况进行了评价,同时应用因子分析方法对T(水温)、DO、SS(悬浮物)、CODMn、BOD5、NO2-N、NO3-N、NH3-N、TIN(总无机氮)、PO4-P等10个水质成分的监测数据进行了分析。结果表明,(1)2001年9月和2002年3月海水出现轻度污染,前者主要是由NO3-N、CODMn和BOD5所引起,后者是由NH3-N、PO4-P引起的。(2)水质监测数据的总体方差主要来源于T、DO、SS、NO3-N及TIN等5个成分,其次是NO2-N、NH3-N、PO4-P,再次是CODMn和BOD5。(3)因子分析结果表明,各水质成分之间存在一定的相关关系。其中,T、DO、SS、NO3-N及TIN同时载荷于第1主因子上,说明此5个水质成分之间具有较好的相关性;NO2-N、NH3-N、PO4-P同时载荷于第2主因子上,则此3个水质成分之间的相关程性较好;CODMn和BOD5同时载荷于第3主因子上,二者之间具有较好的相关性。

The water quality of fish cage aquaculture area was investigated 6 times from June of 2001 to June of 2002 in Dapengao, and the organic pollution exponent evaluation method was used to evaluate the pollution degree,and the factor analysis method was used to analyse the variety of water quality components including T、DO、SS、COD_ Mn 、BOD_ 5 、NO_ 2 -N、NO_ 3 -N、NH_ 3 -N、TIN and PO_ 4 -P. The results show :(1) The water of fish cage aquaculture area was contaminated in the September of 2001 and the March of 2002, and the contamination was caused by NO_ 3 -N、COD_ Mn and BOD_ 5 in the September of 2001, while the contamination was caused by NH_ 3 -N and PO_ 4 -P in the March of 2002. (2)The variance of data from 6 times investigation was caused by T、DO、SS、NO_ 3 -N、TIN primarily, by NO_ 2 -N、NH_ 3 -N、PO_ 4 -P secondly and by COD_ Mn 、BOD_ 5 thirdly. (3)T、DO、SS、NO_ 3 -N、TIN were loaded on the first factor,so they were correlative obviously. In the same way,NO_ 2 -N、NH_ 3 -N 、PO_ 4 -P were loaded on the second factor, so they were correlative obviously, and COD_ Mn 、BOD_ 5 were loaded on the third factor, they have obvious correlation.