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根据2005年5月航次调查数据,采用主成分分析和聚类分析的方法,评价了东海调查海区(27o00’～31o30’N,121o00’～123o30’E)的营养盐来源,并根据海区营养盐特点将所调查海区进行分区。数据中可提取3个主成分,分别为“水文因子”、“光合作用因子”和“再生生产因子”。原始样本聚类方法能较全面地考虑海区水团运动情况,而以考察海区富营养化程度作为目标,按主成分聚类的结果更完善。根据聚类结果对调查样本富营养化程度进行评价,可将调查海域分为三类,随着离岸距离的增加,陆地径流的影响越来越小。
According to the voyage survey data of May, 2005, using principal component analysis and cluster analysis, the source of nutrient in the sea area of East China Sea (27o00 ’~ 31o30’N, 121o00’ ~ 123o30’E) was evaluated, and according to the sea area nutrient Features The area under investigation will be zoned. Data can be extracted three main components, namely “Hydrological factor ”, “Photosynthesis factor ” and “Regeneration factor ”. The original sample clustering method can comprehensively consider the movement of water mass in the sea area, but the eutrophication degree of the sea area is taken as the target, and the result of clustering by principal component is more perfect. According to the clustering results, the eutrophication degree of the surveyed samples can be divided into three categories. With the increase of the offshore distance, the influence of land runoff is getting smaller and smaller.