应用O/E模型评价淮河流域典型水体底栖动物完整性健康的研究

被引:8
作者
陈凯 [1 ,2 ]
刘祥 [1 ]
陈求稳 [1 ]
王敏 [1 ]
王丽 [1 ]
王备新 [2 ]
机构
[1] 南京水利科学研究院生态环境研究中心
[2] 南京农业大学昆虫系水生昆虫与溪流生态实验室
关键词
O/E指数; RIVPACS; 随机森林; 大型底栖无脊椎动物; 生物评价; 淮河;
D O I
10.13671/j.hjkxxb.2015.0702
中图分类号
X826 [生物评价、生态评价];
学科分类号
1402 ;
摘要
本研究尝试采用我国已有的季风气候区底栖动物观测值(O)/期望值(E)比值模型,在无足够数量参照样点的情况下,建立淮河流域O/E指数健康评价指标体系,评价淮河流域典型水体底栖动物物种组成完整性现状.于2014年夏季(8月)和秋季(11月)分别调查了淮河流域20和25个典型水体的底栖动物和水质指标.O/E模型评价结果表明,监测点位在PC(Probabilities of Capture)>0和PC≥0.5条件下,夏季和秋季的物种期望丰富度分别约为25和9.所有25个点位中,仅1个点位为健康,其余为一般或较差;模型控制自然梯度后O/E0和O/E50值均没有显著的季节性差异(p=0.565和0.229).环境胁迫因子(TN、EC、CODCr和p H)和土地覆盖数据(水体比例、湿地比例、裸地比例、森林比例和草地比例)对秋季O/E50和O/E50-null的解释量高于夏季,TN是能够解释淮河流域典型水体夏季O/E指数变异最多的环境因子,p H和CODCr是能够解释秋季O/E指数变异最多的环境因子.研究表明,在缺少有效参照点位构建评价指标体系的情况下,在淮河流域应用已经构建的季风气候区底栖动物O/E指数模型进行健康评价是比较可靠的方法.
引用
收藏
页码:2677 / 2686
页数:10
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