Journal of Tropical Oceanography ›› 2018, Vol. 37 ›› Issue (4): 52-60.doi: 10.11978/2017078CSTR: 32234.14.2017078

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Assessment of eutrophication status by using the Pressure-Status-Response Model in Xiangshan Bay, China

Guofeng XU(), Yongping CUI, Lian LIU()   

  1. Marine Environmental Monitoring Center of Ningbo, State Oceanic Administration, Ningbo 315012, China
  • Received:2017-07-07 Revised:2017-09-08 Online:2018-07-20 Published:2018-07-16
  • Supported by:
    National Marine Special Founds for Public Welfare Project (201105010-14);Shanghai Committee of Science and Technology Research Plan Project (12231203401);Marine Environmental Resources to Repair the Special Subsidy Funds of 2014 (Ningbo Ocean [2014] 46)

Abstract:

Due to its unique geographical position and marine functional zoning, Xiangshan Bay (XSB) has suffered severe eutrophication for many years. Nutrients-based indices have been widely used to assess eutrophication status; however, they cannot comprehensively reflect the true state, and the actual eutrophication status of the bay remains unclear. According to the assessment of eutrophication framework and with the consideration of practical situation in XSB, we modified the assessment framework and optimized partial indices to make the assessment method more suitable for XSB. Using this new assessment framework and field monitoring data from 2001 to 2015, we analyzed the eutrophication pressure and the grade of overall eutrophic conditions, including using chlorophyll as primary symptom and using dissolved oxygen in the bottom layer and red-tide occurrence as secondary symptoms, and predicted the eutrophication trend by taking into consideration of the coastal zone management policy for comprehensive water cleaning activities, and drainage control of total amount of pollutants. The results showed that the integrated eutrophic grade, the eutrophication pressure and the degree of eutrophication status and its response were all at moderate level, based on a scheme of five categories: Superior, Superior-Moderate, Moderate, Moderate-Poor, and Poor. Our results showed that the comprehensive assessment of eutrophication status would remain at the moderate level in next several years. The results reflect the overall degree of eutrophication in the Bay, which is more in accordance with reality. Thus, these results will be helpful for making better new regulations and management plans of eutrophication in XSB.

Key words: Xiangshan Bay, Pressure-Status-Response, eutrophication, forecast

CLC Number: 

  • P735.12