【摘要】 构建河流底栖动物生物完整性指数指标体系是评价河流生态系统健康的重要基础。根据2018-2019年期间在赣江干流12个采样点的底栖动物数据,鉴定出赣江干流底栖动物分为3门6纲13科共24种属,其中优势种有3种,分别为铜锈环棱螺、苏氏尾鳃蚓和大沼螺。通过对18个候选生物指标进行分布范围判别、能力分析以及相关性分析,筛选出总分类单元数、总生物量、甲壳动物和软体动物的个体相对丰度、耐污类群的生物量百分组成完整性指数评价体系,然后采用比值法统一生物参数的量纲,累加各生物参数分值得到B-IBI指数值。赣江干流的健康评价标准由B-IBI值的25%分位数值确定。结果表明:赣江干流12个采样点中的4个为健康,1个为亚健康,1个为一般,其余6个断面的健康状况均处于差或者极差状态,赣江干流生态系统整体上处于一般健康状态。更多还原

【Abstract】 Establishing a benthic index of biotic integrity(B-IBI) for rivers is the premise of the health assessment of their ecosystems.Based on the data of benthos at 12 sampling points in the mainstream of the Ganjiang River during 2018-2019,a total of 24 genera from 3 phyla,6 classes and 13 families of benthos in the Ganjiang River were identified,of which three dominant species were identified as Bellamya aeruginosa,Branchiura sowerbyi and Parafossarulus eximius.Discrimination of the distribution range,ability analysis and correlation analysis of 18 candidate biological indicators were carried out,and the total number of taxon units,total biomass,relative abundance of crustaceans and mollusks,the complete composition of the biomass of pollution-resistant groups were screened out to establish the index evaluation system.Then the ratio method was used to unify the dimensions of biological parameters,from which the value of B-IBI was obtained by accumulating the scores of each biological parameter.Based on the 25% quantile of the B-IBI value,the health evaluation criteria for the mainstream of the Ganjiang River were finally determined.The results show that four of the 12 sampling points in the mainstream of the Ganjiang River are healthy,one is sub-healthy and one is average.The health status of the remaining six sections is in poor or extremely poor state,and the overall ecosystem of the Ganjiang River mainstream is in a general state of health.更多还原