呼伦湖流域磷形态分布及颗粒态磷的溯源

Distribution characteristics of various forms of phosphorus and the traceability of phosphorus in particulate form in Hulun Lake basin

选择呼伦湖研究区23个点位,调查呼伦湖流域水体中不同形态磷的浓度,利用复合指纹识别技术解析沉积物颗粒态磷(PP)来源及不同来源对PP相对贡献.结果表明:呼伦湖流域水体总磷(TP)浓度范围为0.04~0.33mg/L,平均值为0.14mg/L,水体中颗粒态磷(PP)占TP比例范围为45.79%~92.78%.呼伦湖沉积物PP来源主要为退化草地(34.1%~100.0%)、其次为草地(0%~50.7%)和农田(0%~15.2%);乌尔逊河沉积物PP来源主要为退化草地(49.4%~57.1%)和草地(42.9%~50.6%);新开河沉积物PP来源是退化草地(100%);引河济湖(人工河)沉积物PP来源主要是退化草地(83.6%).本研究为呼伦湖流域磷污染的治理及湖泊水环境的改善提供了理论依据.

In this paper,we selected 23 sites in the Hulun Lake area to analyze the concentration of different phosphorus forms in the sediments of Hulun Lake and its inlet and outlet rivers.The composite fingerprint identification technology was then used to explore the sources of particulate phosphorus(PP)and the relative contributions of different sources.Results showed that the total phosphorus(TP)concentration in Hulun Lake Basin ranged from 0.04 to 0.33mg/L,with an average of 0.14mg/L.The proportions of PP to TP was 45.79%~92.78%.The main source of PP in Hulun Lake sediments was degraded grassland(34.1%~100.0%),followed by grassland(0%~50.7%)and farmland(0%~15.2%).Degraded grassland was also the main source of PP in the sediments of Urson River(49.4%~57.1%),Xinkai River(artificial river,100%)and Yinhejihu River(artificial river,83.6%).Grassland contributed an additional 42.9%~50.6%of PP in the Urson River sediments.This study provides a theoretical basis for the control of phosphorus pollution in the Hulun Lake Basin and the improvement of the lake water environment.