大渡河安谷水电站施工期春、秋季浮游动物群落特征分析

研究安谷水电站施工期浮游动物对水文情势改变、栖息地条件变化等工程影响的响应,为径流式水电工程建设对浮游动物的影响预测评价提供参考,为安谷水电站水生态环境发展或生态修复提供科学依据。2014年春季、秋季对大渡河安谷水电站施工期浮游动物及水环境因子进行调查采样,利用SPSS和Canoco软件进行数据分析。结果表明:大渡河安谷水电站施工期春、秋季共检出浮游动物69属116种,密度平均为619.65个/L、生物量平均0.093 mg/L。左侧河网浮游动物种类、密度和生物量高于干流。浮游动物种类、密度、生物量和多样性指数在季节分布上差异显著,春季明显高于秋季。浮游动物种类、密度、生物量与环境因子硝氮、总氮、磷酸盐、总磷呈显著正相关,与流速呈负相关;RDA结果进一步说明硝氮、磷酸盐、TN、TP是影响浮游动物群落结构的重要环境因子。

Spring and Autumn Zooplankton Community Characteristics during Construction of Angu Hydropower Station on Dadu River

The zooplankton and water environment factors in spring and autumn during the construction period of the Dagu River Angu Hydropower Station are investigated and sampled, and Spss22 and Canoco 4.5 software are used for data analysis. The results show: During the construction period of the Dagu River Angu Hydropower Station, 116 species and 69 genera of zooplankton are detected in spring and autumn. The average density is 619.65 ind./L and the average biomass is 0.0930 mg/L. The species, density and biomass of zooplankton in the river network on the left are higher than those in the mainstream. The species, density, biomass, and diversity index of zooplankton differed significantly in seasonal distribution, which is significantly higher in spring than in autumn. The species, density and biomass of zooplankton were positively correlated with environmental factors such as potassium nitrate, TN, phosphate and TP, and negatively correlated with the flow rate. The results of RDA further demonstrated that potassium nitrate, phosphate, TN and TP are important environmental factors that affect the community structure of zooplankton in the surveyed waters. The construction of hydropower project has brought great economic and social benefits to us, and also has a certain impact on the surrounding aquatic environment. The density and biomass of zooplankton during the construction period of Angu Hydropower Station are higher than that of the eia period. On the one hand, it is affected by the construction, on the other hand, human interference is too frequent. Therefore, we must develop in the protection and achieve harmony between people and water.