乐清湾海水养殖环境水质质量时空变化及富营养化状况评价

Analysis of spatial-temporal variation and nutritional status of environmental quality in the mariculture zone at the Yueqing bay

  • 摘要: 本文分析了2016-2018年乐清湾养殖区水体中pH、温度、盐度、溶解氧(dissolved oxygen,DO)、叶绿素(chlorophyl A,Chl a)、氨氮(ammonia nitrogen,NH4-N)、亚硝酸盐氮(nitrite nitrogen,NO2-N)、硝酸盐氮(nitrate nitrogen,NO3-N)、可溶性磷酸盐(soluble active phosphors,DIP)等海水水质质量指标,并研究了其水质质量状况。通过单因子污染指数法的评价结果表明,乐清湾养殖区的pH、温度、盐度、DO等指标均符合国家二类水质标准。与其他海域养殖区比较,DO浓度处于偏低状态;而DIN和DIP的浓度较高。利用水质质量富营养化指标分析法(the analysis of water quality eutrophication index,TRIX),本研究发现乐清湾养殖区的水质富营养指标值较大,处于较高的富营养化状态。通过主成分分析(principal component analysis,PCA)可知,第一主成分相关指标主要是NO2-N、NH4-N、DIP、温度以及NO3-N,且NH4-N、NO3-N、DIN与TRIX之间存在良好的正相关关系。

     

    Abstract: Based on the monitoring data of the mariculture zone at the Yueqing bay from 2016 to 2018, the assessment and analysis on the marine environmental quality is conducted. The spatial-temporal variation and the relevance of pH, temperature, salinity, DO, Chl a, NH4-N, NO2-N, NO3-N and DIP of seawater in these areas were analyzed and their nutritional status were also evaluated. Assessment by single factor pollution index method revealed that the levels of pH, temperature, salinity and DO in these areas were in accordance with the national second-class water quality standard. Compared with those in other marine aquaculture zones, the DO concentration levels were in the low, and the DIN and DIP levels were in the high. According to TRIX, the eutrophication index of water quality in these areas were relatively high and may be in a state of high eutrophication. The related indexes of the first principal component were NO2-N, NH4-N, DIP, temperature and NO3-N by PCA, and there were positive correlation among NH4-N, NO3-N, DIN and TRIX.

     

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