基于底栖动物完整性指数的小清河健康评价

Health Assessment of Xiaoqing River Based on Benthic-Index of Biotic Integrity(B-IBI)

为了建立河流生态系统健康的评价标准以保证河流的可持续性发展,以小清河为例,选用底栖动物完整性指数评价其健康状况。2014年5月—2015年10月,对小清河7个典型采样点的底栖动物共进行6次调查。通过分布范围、判别能力和Pearson相关性分析,从32个候选生物指标中筛选出适合于构建小清河B-IBI评价体系的5个参数,采用比值法将小清河健康状况按评分分为5个等级:>3.70为健康,(2.77,3.70]为亚健康,(1.85,2.77]为一般,(0.92,1.85]为差,≤0.92为极差。结果表明:小清河吴家堡采样点处于"健康"状态,五柳闸和石村采样点处于"亚健康"状态,黄台桥和五龙堂采样点处于"一般"状态,梁府庄、岔河水文站采样点处于"较差"状态,且底栖动物完整性指数值与总氮、总磷成负相关,与香浓威纳多样性指数成显著正相关。说明构建的B-IBI评价指标与标准对小清河的健康评估具有较好的适用性。

In order to build an evaluation criteria and standard of river ecosystem health for the sustainable development,the Benthic-Index of Biotic Integrity was applied to evaluate the health state of Xiaoqing River. From May 2014 to October 2015,32 candidate metrics were selected from 58 zoobenthos investigated for 6 times from 7 typical sampling sites in Xiaoqing River. Then,after distribution range,discriminant ability and correlation analysis,five key metrics were detected and entered into the final B-IBI system. The B-IBI standard for health assessment of Xiaoqing River established by ratio method was that 3.70 represented excellent,（ 2.77,3.70]represented good,（ 1.85,2.77]represented fair,（ 0.92,1.85] represented poor and ≤0.92 represented very poor. The results show that Wujiabao sampling point is in the state of ＂health＂,Wuliu Gate and Shicun Village sampling points are in the state of＂subhealth＂,Huangtai Bridge and Wulongtang sampling points are in the state of＂general＂,Liangfuzhuang and Chahe Hydrological Station sampling points are in the state of＂poor＂. The B-IBI value is negatively correlated with total nitrogen and total phosphorus and positively correlated with Shannon Wiener diversity index. In summary,the evaluation criteria and standard of B-IBI have better applicability on Xiaoqing River＇s health.