北仑河口近岸海域生态健康分析与评价

Marine Ecosystem Environmental Health Assessment in the Coastal Waters of Beilun Estuary

关键词:  北仑河口  生态环境  健康评价

Key words:  Beilun Estuary  ecological environment  health assessment

摘要:

[目的]对北仑河口近岸海域生态环境质量现状进行分析,评价该海域的生态系统健康状况。[方法]根据2011年11月对广西北仑河口近岸海域海洋的调查结果,采用《近岸海洋生态健康评价指南》中的河口及海湾生态系统健康评价方法对该海域的生态系统健康状况进行分析与评价。[结果]水环境健康指数、沉积环境健康指数、生物残毒健康指数、栖息地健康指数、生物健康指数分别为11.73、10.00、9.00、10.00、14.24,海域生态系统健康指数为54.97。表明,北仑河口近岸海域水环境和沉积环境都处于健康状态,未受生物残毒污染,而栖息地和生物指标分别处于亚健康和不健康状态;虽然水环境判定为健康状态,但其健康指数已接近亚健康标准阈值,且已呈现富营养化。[结论]综合5类评价因子的评价结果,判定北仑河口近岸海域的生态环境处于亚健康状态。

Abstract:

[Objective] The ecological environmental quality condition and marine ecosystem environmental health of Beilun Estuary was analyzed and assessed.[Method] According to the Guideline for the Assessment of Coastal Marine Ecosystem Health (2005), the assessment of marine ecosystem environmental health was conducted for the study area.[Result] The index of water environment, sedimentary environment, biological residue, habitat, and marine organism were 11.73, 10.00, 9.00, 10.00 and 14.24, respectively.The index value of marine ecosystem environmental health was 54.97.The result indicated that the water environment, sedimentary environment, and biological residue were in healthy status, whereas the marine organism index has reached a sub-healthy status, and the habitat index was in unhealthy status. It is noteworthy that the water environment has reached the threshold of sub-healthy status, and the eutrophication index (EI) indicated that the whole sea area was eutrophic.[Conclusion] The levels of the five categories were combined into a single rating for the coastal waters of Beilun Estuary, resulting in a rating of sub-healthy.