摘要
基于2013年夏、秋季和2014年春季黄渤海海域调查数据,分析了该海域叶绿素a的含量、分布特征及其环境影响因素(温度、盐度、pH值、溶解无机氮、硅酸盐、磷酸盐).结果表明:2013年夏、秋季和2014年春季,黄渤海海水中叶绿素a含量范围分别是0.918~9.287,1.477~6.435,1.837~5.966mg/L,平均浓度分别为3.527,3.467,3.524mg/L;夏季和春季叶绿素a含量略高,秋季叶绿素a含量最低且变化范围较小;渤海海域叶绿素a分布具有明显区域特征,其分布基本呈近岸高、中部海域低的分布趋势;将水质参数作为自变量输入支持向量机(SVM)中,GA-SVM算法拟合效果(R2>0.9)和精确度(MSE<0.01)较好,不同水质参数对海水叶绿素a含量的影响相对重要性具有季节差异,夏季,对海水叶绿素a含量影响最重要是磷酸盐和温度;秋季,对于海水叶绿素a含量影响最重要是硅酸盐和盐度;春季,对于海水叶绿素a含量影响最重要的是盐度和溶解无机氮.所有调查季节,对于海水叶绿素a含量影响最重要的是盐度和磷酸盐.综合参数影响重要性,表明陆源输入是黄渤海海域叶绿素a含量的最重要影响因素.
The distribution characteristics of chlorophyll-a(Chl-a) and the related environmental factors(T, S, pH, DIN, SiO_3^(2-)-Si, PO_4^(3-)-P) were examined for seawater samples obtained from the Yellow Sea(YS) and the Bohai Sea(BS) in the summer of 2013, the autumn of 2013 and the spring of 2014. The results showed that Chl-a concentration ranged 0.918~9.28μg/L in the summer of 2013 with an average of 3.527μg/L, 1.837~5.966μg/L in the autumn of 2013 with an average of 3.524μg/L and 1.477~6.435μg/L in the spring of 2014 with an average of 3.467μg/L; Chl-a spatial distribution showed a decreasing trend from inshore area to offshore area; The GA-SVM model was used to investigate the Chl-a response relationship with the above environmental factors and the results confirmed the good performance(R^2>0.9, MSE<0.01). The influence of parameters on the distribution of Chl-a had a significant seasonal variation. The two most significant variables to the distribution of Chl-a were PO_4^(3-)-P and T in summer, SiO_3^(2-)-Si and S in autumn, S and PO_4^(3-)-P in spring and S and PO_4^(3-)-P in all three seasons which demonstrated that the terrestrial input were most tightly related to the distribution of Chl-a in the BS and the YS.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第11期4259-4265,共7页
China Environmental Science
基金
国家重点研发计划项目(2016YFC1402101
2016YFC1400602)
国家海洋局海洋减灾中心科研项目(2014AA060)
关键词
黄渤海
叶绿素A
相关性分析
支持向量机
Bohai Sea and Yellow Sea
chlorophyll a
correlation analysis
support vector machine
