基于熵权模糊物元法的广东省海洋牧场生态效益评价

Ecological benefit evaluation of marine ranching in Guangdong Province based on Entropy Weight Fuzzy Matter Element Method

海洋牧场是广东省海洋渔业资源养护和环境修复的重要手段之一。为系统评估广东省海洋牧场的生态效益,采用熵权法(Entropy Weight Method)和模糊物元法(Fuzzy Matter Element Method)构建综合评价模型,根据2019—2021年广东省10个海域养护型海洋牧场的生物资源和环境因子调查数据,筛选出透明度、溶解氧、叶绿素、初级生产力、浮游生物多样性等26个关键指标,并制定三类标准作为参照。结果显示,2019—2021年广东省海洋牧场生态效益的综合得分分别为0.588113、0.609307和0.521257,均高于一类标准的评价值(0.462171),表明广东省海洋牧场保持了较高的生态质量,并有效改善了海域的生态环境;初级生产力在生态效益评价中具有较高的重要性,其2021年的得分略有下降,主要受到无机氮含量上升和浮游生物、底栖生物多样性指数降低的影响。研究建议,应进一步完善评价指标体系和加强对外部环境因素影响的研究,以更科学地评估海洋牧场的生态效益。

Marine ranching is one of the key measures for the conservation of marine fishery resources and environmental re-storation in Guangdong Province.To systematically evaluate the ecological benefits of marine ranching construction in Guang-dong Province,we applied Entropy Weight Method(EWM)and Fuzzy Matter Element Method(FMEM)to construct a compre-hensive evaluation model to evaluate the ecological benefits of the construction of marine ranching.Based on the survey data of biological resources and environmental factors of marine ranching in ten sea areas of Guangdong Province from 2019 to 2021,we screened out 26 key indicators such as transparency,dissolved oxygen,chlorophyll,primary productivity,planktonic biodi-versity,etc.,and developed three types of standards as a reference.The results show that the comprehensive evaluation scores of the ecological benefits of marine ranching in Guangdong Province from 2019 to 2021 are 0.588113,0.609307 and 0.521257,re-spectively,all of which are higher than the evaluation value of the first-class standard of 0.462171,revealing that the marine ranching in Guangdong Province have maintained high ecological quality and effectively improved the ecological environment of the sea area.Primary productivity has a high importance in ecological benefit evaluation,and the slight decline in the score in 2021 is mainly due to the rise in inorganic nitrogen content and the decrease in the biodiversity indices of plankton and benthic organisms.It is recommended to further improve the evaluation index system to provide a more scientific method for evaluat-ing the ecological benefits of marine ranching.