伊通河城区段生境评价与水质指标的关系分析

Analysis on the Relationship Between the Ecological Environment Evaluation and Water Quality Indicators in Yitong River City

为了科学评价伊通河城区段河流生境状况,构建具有科学性的伊通河生境质量评价指标体系,对此区域进行了生境指标调查、水质指标检测工作,深刻掌握了伊通河城区段河流现状,进而探讨生境质量与水质的关系。结果表明:伊通河城区段实证点位中,新立城水库坝下、北湖桥下生境状况为良好,自由拦河闸前、新华拦河闸前、四化拦河闸前、吉顺明沟生境状况较差,生境指标高的采样点离人类活动密集区域较远,受人为干扰较小。伊通河城区段各样点水体中TP质量浓度为0.06~0.35mg·L^(-1)、TN的质量浓度为0.23~6.39mg·L^(-1)、NH_(4)^(+)-N质量浓度为0.03~1.9mg·L^(-1)、CODCr质量浓度为10.54~47.41 mg·L^(-1)。溶解氧指标均符合国家地表水环境标准Ⅲ类水。伊通河城区段生境综合评价指数与TN、NH_(4)^(+)-N、TP呈显著负相关,主要水生植物、河岸植被总体状况、水体气味、河岸土地利用等生境指标对水质影响较大。

In order to scientifically evaluate the ecological environment of the river in the urban area of Yitong River and construct a scientific evaluation index system for the quality of the ecological environment of the Yitong River, the area was investigated for habitat indicators and water quality indicators;and the current status of the river in the urban area of the Yitong River was deeply grasped. And then the relationship between habitat quality and water quality was discussed. The results showed that among the demonstration points in the Yitong River city section, the habitat conditions under the dam of Xinlicheng Reservoir and under the Beihu Bridge were good;the habitat conditions in front of the free barrier gate, in front of the Xinhua barrier gate, in front of the Sihua barrier gate, Jishun Minggou were poor, and the sampling points with high habitat indicators were far away from the areas where human activities were intensive, and were less subject to human interference. The content of TP in the water at each sampling point in the Yitong River section was 0.06~0.35 mg·L^(-1), the content of TN was 0.23~6.39 mg·L^(-1), the content of NH_(4)^(+)-N was 0.03~1.9 mg·L^(-1), CODCr content was 10.54~47.41 mg·L^(-1). The dissolved oxygen content was in line with the national surface water environmental standard III water. The comprehensive evaluation index of the ecological environment in Yitong River City was negatively correlated with TN, NH_(4)^(+)-N, and TP. The main aquatic plants, the overall status of riparian vegetation, the smell of water bodies, and the use of riparian land had a greater impact on water quality.