滇池宝象河水体氨氮时空变化特征研究

宝象河作为流入滇池的第二大河流,其水质状况将影响滇池的富营养化程度。通过对宝象河主要耗氧污染物之一氨氮(NH_3-N)含量的动态监测与研究,探讨了宝象河水体氨氮的时空变化规律及其影响因素。研究结果表明:宝象河流域水体NH3-N浓度在雨季主汛期达到最低值,在枯水季节12月至次年1月达到峰值,随季节变化大致呈现旱季升高,雨季降低的趋势;从空间上来看,上游白土镇到下游入滇口水体NH_3-N浓度总体呈现逐渐降低的趋势;流域内频繁的农业生产活动及生活污水汇入是影响宝象河水体氨氮浓度变化的主要因素,在一定程度上加剧了宝象河的水体富营养化。根据分析结果,提出了具有针对性的宝象河污染防控措施。

Study on spatiotemporal variation characteristics of Ammonia Nitrogen in Baoxiang River of Dianchi Lake

The Baoxiang River is the secondary largest river in Dianchi Lake Basin and its water quality directly influences the eutrophication of Dianchi Lake. Through dynamic monitoring and analysis on the content of main pollutant NH3-N, this paper researches the spatial and temporal variation law and influential factors. The results show that NH3-N in the Baoxiang River is lowest in main flood season and rises to the highest in the period of December to next year January in dry season; in temporal, with the seasonal variation, the content takes on a trend of rising in dry season and declining in rainy season; in spatial, the content takes on a trend of gradually declining from Baitu Town to downstream entrance of Dianchi Lake; the active agricultural activities and domestic sewage in the basin are the main influential factors to the variation of NH3-N content, which worsens the water eutrophication of the Baoxiang River in some extent. According to the analysis results, the targeted pollution control measures for the Baoxiang River are suggested.