摘要
为了解尼洋河干流水体重金属Cd与pH、COD、TN、TP的关系,摸清重金属Cd的空间分布及来源,运用SPSS及GIS模型,对尼洋河干流上10个监测点的pH、COD、TN、TP及Cd指标检测结果进行统计分析,同时利用反距离权重插值法分析干流重金属Cd的空间分布状况。结果表明:(1)尼洋河丰水期干流水体满足Ⅲ类地表水质标准,空间分布上变化幅度最大的指标为COD,巴河与娘曲对尼洋河干流水环境指标浓度影响较大。(2)干流水体中TN与pH、Cd与TP之间存在极显著的正相关性(P<0.01),重金属Cd与TP存在多元回归的线性关系,回归常数为0.003,回归参数为83.072。(3)干流水体重金属Cd沿河流方向总体呈逐步下降的趋势,主要来源于自然矿产及沿河两岸的农业面源污染。研究结果可为尼洋河流域水环境保护治理和重金属Cd的防治提供一定的依据。
In order to understand the relationship between Cd and pH,COD,TN,TP,and find out the spatial distribution and source of Cd,SPSS and GIS models were used to analyze the detection results of pH,COD,TN,TP and Cd in 10 monitoring points of the main stream of Nyang River,and the spatial distribution of heavy metal Cd in the main stream was analyzed by inverse distance weight interpolation.The results showed that:(1) the main stream water body of the Nyang River met the class III surface water quality standard in the flood season,and COD was the most variable index in the spatial distribution,Bahe River and Niangqu River had great influence on the water environmental index concentration in the main stream of Nyang River.(2) There was a significant positive correlation between TN and pH,Cd and TP in the main stream water(P < 0.01).There was a linear multiple regression relationship between Cd and TP.The regression constant was 0.003,and the regression parameter was 83.072.(3) The metal Cd in the main stream water decreased gradually along the river,mainly from natural mineral resources and agricultural non-point source pollution along both banks of the river.The results can provide a reference for water environment protection and control of heavy metal Cd in Nyang River Basin.
作者
郝守宁
付意成
HAO Shouning;FU Yicheng(School of Water Resources and Civil Engineering,Tibet Agriculture and Animal Husbandry University,Nyingchi 860000,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《人民长江》
北大核心
2021年第1期39-43,共5页
Yangtze River
基金
国家重点研发计划项目(2016YFC04014-08)
西藏自治区自然科学基金项目(XZ 2018ZR G-29(Z))
中国水科院科研专项(WE0145B532017)
国家自然科学基金项目(51509271)
水利部技术示范项目(SF-201808)。
关键词
水环境因子
重金属
关联分析
尼洋河
water environment factors
heavy metal
correlation analysis
Nyang River
