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OALib Journal期刊
ISSN: 2333-9721
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农业生产、小城镇和城市废水对西苕溪水质和底栖动物群落的影响
DOI: 10.3724/SP.J.1145.2009.00342, PP. 342-346
Keywords: 大型底栖无脊椎动物,农业污染,城镇溪流,西苕溪
Abstract:
摘要于2006年4月~2007年3月调查了西苕溪中上游3个参照、7个农业面源、3个小城镇和1个城市废水污染溪流的水质和底栖动物.结果表明，受污染溪流的nh3-n、tp、codmn和电导率显著高于参照(p<0.05).城市溪流的nh3-n[(2.46±2.69)mg/l]、tp[(0.573±0.179)mg/l]和codmn[(4.680±0.959)mg/l]显著高于农业面源和小城镇废水的(p<0.05)，但ph(7.34±0.06)和do[(4.47±0.88)mg/l]显著低于农业面源和小城镇的(p<0.05).小城镇污染溪流的tp和电导率显著高于农业面源的，其余指标均无显著差异.与参照相比，3种污染类型溪流底栖动物群落总分类单元丰富度、ept丰富度、shannon-wiener多样性指数和b-ibi生物完整性指数均显著降低.城市对底栖动物群落的影响最严重，但小城镇与农业面源之间对底栖动物群落结构的影响无显著差异.研究结果表明，农业生产废水和城镇废水污染是西苕溪中上游水生态系统健康退化的主要原因之一，但有关退化的机制还需深入研究.图2表4参19
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