底栖生物完整性指数的构建及生物基准的确定

基于2009～2013年7个航次渤海湾天津段的大型底栖动物和水质、沉积物环境数据，结合国内外已有的研究结果，首次尝试采用AZTI海洋生物指数以及水质和沉积物质量确定参考点，同时采取标准化方法筛选生物指标，确定各指标的阈值分级标准，从而构建出生物完整性指数.取参考点生物完整性指数值的90%分位数作为基准值，得出该海域生物基准值为5.适用性验证结果表明，生物完整性指数能够较好地指示研究区受干扰的生态质量状况，较为敏感地响应营养盐及重金属压力，也适用于评价该区域的底栖生态质量状况.因此，采用生物完整性指数法来确定生物基准是合理可行的.

Development on the benthic index of biological integrity and determination for the biocriteria

The Benthic Index of Biological index (B-IBI) was erected based on the related data (macrozoobenthos, water quality and sediment environment) collected from the Tianjin coastal areas of the Bohai Bay during 2009 to 2013 as well as the available research experience. This is the first time to determine reference sites using AZTI marine biotic indices, water quality and sediment quality. Meanwhile, the standard method was employed to select biological indicators and to define the different levels for their thresholds. Thus, the index of biological integrity was developed. The 90% quantile of the IBI values in the reference sites was adopted as the base value and the calculated biocriteria value was 5. Results showed that the IBI could indicate the ecological quality of the study area, and also could response to nutrients and heavy metals pressures in this area. Therefore, it was reasonable and feasible to determine the biocriteria with the IBI method.