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太湖流域平原水网区大型底栖动物完整性评价
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摘要
基于75个典型断面底栖动物的监测数据,应用生物完整性的理论和方法,对太湖流域平原水网区进行水生态健康评估。首先,以样点环境所承受的干扰程度为标准,确定参照点(13个)和受损点(62个)。其次,对底栖动物的21个候选参数(涉及群落丰富度、组成、耐污能力及摄食功能四大类)进行分布范围、判别能力及相关性分析。根据这些分析,筛选出有较强预判能力且相对独立的6个核心参数-总分类单元、软体动物分类单元、香农多样性指数、前3位优势分类单元相对丰度、BI指数、滤食者相对丰度-构成B-IBI的评价体系。然后,通过比值法统一量纲,以参照点B-IBI值的25%分位数值作为健康基准,运用4分法划分健康分级标准:B-IBI≥2.84为健康;2.13≤B-IB<2.84为亚健康;1.42≤B-IB<2.13为一般;0.71≤B-IB<1.42为差;B-IB<0.71为极差。最后,应用经建立的B-IBI标准,对该流域的水体进行健康评估,结果显示:B-IBI评价与基于水质及富营养化评价的结果高度吻合。但今后仍需加强该评价体系的标准化及本土化等方面的研究。
A preliminary Benthic Index of Biotic Integrity(B-IBI) was developed to assess aquatic ecosystem health in the plain waterway network of Taihu-basin. To do so we used 21 candidate metrics describing structure and function of macroinvertebrate assemblages from 13 reference sites and 62 impaired sites.Twenty-one candidate metrics were evaluted by distributing range analysis, discriminatory power analysis and Pearson correlation analysis. The final B-IBI was composed of total taxa number, the molluscan taxa number,Shannon-winner index, percentage of three most-dominant taxa, the Biotic index and percentage of the filter-group. Finally, the scoring criteria of B-IBI were normalized based on the quadrisection system, and these scores were interpreted as excellent(≥2.84), good(2.04-2.84), moderate(1.42-2.04), poor(0.71-1.42), very poor(<0.71). The application of B-IBI showed the relatively good for the southern-and-eastern lakeshores and the Daxi reservoir, but poor for the northern-and-western ones and its upstream river networks. Our B-IBI distinguished well between reference and impaired sites, giving a significant negative linear response to a gradient of chemical anthropogenic disturbances. In future, more work should focus on strengthening standardization and localization of B-IBI for local government and managing agencies.
引文
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