贵州高原三板溪水库富营养化时空特征与影响因素

Spatial-temporal characteristics and affecting factors of eutrophication in Sanbanxi Reservoir,Guizhou Province

为揭示大型深水水库--三板溪水库富营养化的时空特征及影响因素,于2012年11月（枯水期）,2013年4月（平水期）和7月（丰水期）对其水体的富营养化指标和相关环境因子进行研究。结果表明：三板溪水库富营养化分布状况存在着明显的时空差异;枯水期综合营养指数（TLI）为33.39-39.20,垂直断面内均为中营养水平;平水期和丰水期TLI分别在39.70-59.44和39.19-56.27,上层为轻度富营养化水平,中层和下层为中营养水平,富营养化水平随水深增加呈先降低后升高的趋势;氮和磷是引起三板溪水库富营养化水平较高的主要因素,尤其是磷对富营养化程度加剧的贡献最大,降低水库磷的输入能够有效控制水库富营养化趋势。

In order to reveal the spatial and temporal characteristics of eutrophication in SanbanxiReservoir, a large and deep reservoir, and its influencing factors, the eutrophic index and relatedenvironmental factors were investigated in November （dry period） 2012, April （normal period）and July （wet period） 2013. The results indicated that the eutrophication characteristics of San-banxi Reservoir showed obvious spatial and temporal variations. The trophic level index （TLI）was 33.39-39.20 in the dry period and the eutrophication status kept at mesotropher. The TLIwas 39.70-59.44 in the normal period and 39.19-56.27 in the wet period. The upper layer wasat light eutropher, and the middle and lower layer kept at mesotropher. The eutrophication statusdecreased at first and then increased with the increasing depth. Nitrogen and phosphorus were themain factors causing the eutrophication status of Sanbanxi Reservoir, especially phosphorus madethe greatest contribution to the eutrophication status. Reducing the discharge of phosphorus caneffectively control the trend of eutrophication.