尼洋河表层沉积物中TP、TN空间分布特征研究

Study on spatial distribution characteristics of TP and TN in surface sediments of Niyang River

采用现场调查、布点监测和实验室化学性质分析等方法,对西藏尼洋河流域表层沉积物中TP、TN含量进行调查,分析其来源和污染程度。结果表明:尼洋河上覆水中TN平均浓度为0.47 mg/kg, TP总体平均浓度为0.06 mg/kg;表层沉积物中TN平均浓度为421 mg/kg, TP总体平均浓度为445 mg/kg,通过空间分析呈现出先降低后增加在降低的趋势,不同采样点TP、TN的空间分布差异较明显。对沉积物和上覆水中TP、TN的相关性分析,表层沉积物中与上覆水中TP、TN主要来源基本相同。对层沉积物中TP、TN含量的污染评价,尼洋河表层沉积物中TP、TN暂时不具有生态风险的危害效应,对环境产生的危害较小。

The contents of TP and TN in the surface sediments of the Niyang River Basin in Tibet were investigated by means of field investigation, site monitoring and laboratory chemical property analysis, and their sources and pollution levels were analyzed. The results showed that the average concentration of TN in the overlying water of the Niyang River was 0.47 mg/kg, and the overall average concentration of TP was 0.06 mg/kg;the average concentration of TN in the surface sediments was 421 mg/kg, and the overall average concentration of TP was 445 mg/kg. The analysis showed a trend of decreasing at first, then increasing and then decreasing, and the spatial distribution of TP and TN at different sampling points was significantly different. The correlation analysis of TP and TN in the sediment and the overlying water shows that the main sources of TP and TN in the surface sediment and the overlying water are basically the same. According to the pollution evaluation of TP and TN content in the sediments, TP and TN in the surface sediments of the Niyang River do not have the harmful effect of ecological risk temporarily, and the harm to the environment is relatively small.