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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。
According to the water quality monitoring data of 6 voyages in the cage culture area of Dapeng’ao from June 2001 to June 2002, the water quality of the aquaculture area was evaluated by using the organic pollution evaluation index method. Meanwhile, the water quality of T ), DO, SS (suspended solids), CODMn, BOD5, NO2-N, NO3-N, NH3-N, TIN and PO4-P were analyzed. The results showed that: (1) Seawater was slightly polluted in September 2001 and March 2002, the former was mainly caused by NO3-N, CODMn and BOD5, while the latter was caused by NH3-N and PO4-P. (2) The total variance of water quality monitoring data mainly comes from five components of T, DO, SS, NO3-N and TIN, followed by NO2-N, NH3-N and PO4-P and again CODMn and BOD5. (3) The result of factor analysis shows that there is a certain correlation between the water quality components. Among them, T, DO, SS, NO3-N and TIN were simultaneously loaded on the first principal factor, indicating good correlation between the five water quality components. NO2-N, NH3-N and PO4- On the second main factor, the correlativity between the three water quality components is better; CODMn and BOD5 are simultaneously loaded on the third main factor, and there is a good correlation between the two.