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| Fuzzy comprehensive evaluation based on macroinvertebrate biological indices for water quality monitoring in the Qing River basin |
| Received:September 10, 2018 |
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| KeyWord:macroinvertebrates;biological indices;water quality;fuzzy comprehensive evaluation |
| Author Name | Affiliation | E-mail | | CHEN Jia-bo | Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun 113001, China | | | ZHAO Rui-chen | College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China | | | WANG Yan-jie | Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun 113001, China | yanjie_wang0810@hotmail.com | | LI Fa-yun | Institute of Eco-environmental Sciences, Liaoning Shihua University, Fushun 113001, China
School of Resources and Environmental Science, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| Macroinvertebrates, the main aquatic organisms in riverine environments, can reflect changes in river water quality. This study used a fuzzy comprehensive evaluation method based on macroinvertebrate indices to evaluate the quality of the water in the Qing River basin during different water periods. Macroinvertebrate species abundance, density, and related indices were first calculated and analyzed. Then the Shannon-Wiener diversity index, Margalef richness index, Simpson diversity index, Pielou evenness index, family biotic index (FBI), and sensitivity index for macroinvertebrates were used as evaluation factors to establish fuzzy and weight matrices and the water grades were calculated. By comparing these grades, the water level of each point in the dry and wet seasons was obtained. The macroinvertebrate community structure and biological indices in Qing River basin changed between dry and wet seasons at different sites. Overall, the abundance, diversity, richness, and sensitivity indices were higher in the wet season than in the dry season. The upper reaches of Qing River and its main tributaries were more biodiverse and sensitive to change than the lower reaches. Biodiversity decreased downstream, near townships and urban areas, and the proportion of benthic macroinvertebrates with a high tolerance for pollution increased. The results of the fuzzy comprehensive evaluation showed that the proportion of clean, slightly polluted, and moderately polluted samples from the dry and wet seasons was 12.5%, 12.5%, 75% and 18.75%, 43.75%, 37.5%, respectively. The number of moderately polluted sites decreased and the number of clean and slightly polluted sites increased, during the wet season. Most of the upper reaches of the main stream and its tributaries were clean or slightly polluted while the lower reaches were mostly moderately polluted. |
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