| 底栖动物完整性指数评价西苕溪溪流健康 |
| 摘要点击 2986 全文点击 2873 投稿时间：2006-11-06 修订日期：2007-02-05 |
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| 中文关键词 B-IBI指数 溪流 健康评价 大型底栖无脊椎动物 |
| 英文关键词 benthic index of biotic integrity stream health assessment macro-invertebrate |
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| 中文摘要 |
| 根据浙江安吉县西苕溪的64个底栖动物样点数据，对36个生物参数的分布范围、Pearson相关性和判别能力进行分析，确定B-IBI指数由总分类单元数、EPT分类单元数、鞘翅目%、前3位优势分类单元%、(纹石蛾科/毛翅目)%、滤食者%和BI指数构成.用比值法统一参数量纲，采用直接累加、变异系数权重法和熵值权重法分别计算B-IBI值并进行B-IBI健康标准的准确性检验，结果表明，熵值权重法的准确性（92.9%）优于直接累加（85.7%）和变异系数权重法（78.5%）.建立了评价西苕溪健康的B-IBI标准：B-IBI>0.69 健康，0.52～0.68 亚健康，0.35～0.51 一般，0.18～0.34 差，B-IBI<0.17 极差.B-IBI指数与栖境指数（r=0.62，p<0.01）、水温（r=-0.64，p<0.01）和海拔（r=0.64，p<0.01）显著相关. |
| 英文摘要 |
| Stream macro-invertebrate assemblages were collected from 64 stream sites in Xitiaoxi Stream, Anji County, Zhejiang Province, China. Thirty-six candidate metrics were evaluated stepwise by distributing range analysis, discriminatory power analysis, and Pearson's correlation analysis. The B-IBI was composed of seven metrics: total taxa, EPT taxa, Coleoptera %, three dominant taxa, Hydropsychidae (Trichoptera) %, filterers %, and Biotic Index (BI). The ratio scoring method was used to transform the value of each metric into a uniform score. A variability coefficient method and an entropy method were used to calculate the weight value of each metric of the B-IBI. The measurement accuracy of the health criteria for the B-IBI derived from all sample data was better than that from only reference data. The entropy method had a higher accuracy (92.9%) than the sum total score method (85.7%) and the variability coefficient method (78.5%) in discriminating stressed and reference sites. The B-IBI health criteria for Xitiaoxi Stream were: B-IBI>0.69=healthy, 0.52-0.68=sub-healthy, 0.35-0.51=good-fair, 0.18-0.34=fair, B-IBI<0.17=poor. The Pearson's correlation analysis between B-IBI and chemical-physical variables showed that the B-IBI strongly corresponded with the habitat quality index (r=0.62, p<0.01), water temperature (r=-0.64, p<0.01), and altitude (r=0.64, p<0.01). Our results suggest that the B-IBI is a good indicator in stream health assessment and should be used in water resource management in China. |
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