阿哈水库沉积物-水界面磷、铁、硫高分辨率空间分布特征

发布时间：2018-01-25 17:13

  本文关键词： 阿哈水库 沉积物-水界面 薄膜扩散梯度技术 磷 硫 铁　出处：《环境科学》2017年07期 　论文类型：期刊论文

【摘要】：选取贵州典型高原亚深水型湖库阿哈水库为研究对象,利用薄膜扩散梯度技术获取夏季分层期不同湖区沉积物-水界面磷、铁、硫的原位、二维高分辨分布信息,并结合水化学及沉积物磷形态分析,探讨了沉积物P-Fe-S分布规律及控制因素.结果表明:沉积物-水界面DGT-P的浓度变化范围0.00~0.43 mg·L~(-1),DGT-Fe的浓度变化范围0.00~2.83 mg·L~(-1),DGT-S的浓度变化范围0.00~0.10 mg·L~(-1).阿哈水库沉积物孔隙水磷、铁、硫浓度在垂向分布上没有显著的相关性,DGT-P、DGT-Fe甚至还呈反向变化,这与很多湖泊的研究结果存在明显差异,其原因可能是阿哈水库沉积物具有很高的Fe/P和Fe/S比值,过剩的Fe导致还原态S以FeS/FeS_2形式沉淀后,P仍然被Fe(Ⅲ)固定在沉积物中.阿哈水库沉积物磷形态以Na OH-SRP和BD-P为主,Na OH-SRP含量变化范围为192~604 mg·kg~(-1),平均值约为392 mg·kg~(-1),BD-P含量变化范围为143~524mg·kg~(-1),平均值约为225 mg·kg~(-1).阿哈水库底层水体长期处于厌氧环境,Fe、S地球化学循环对沉积物内源磷释放起着重要控制作用.
[Abstract]:The Kuaha reservoir of subdeepwater lake in Guizhou Plateau was selected as the research object. The in situ of P, Fe and S at the sediment-water interface of different lake areas in the delamination period in summer was obtained by using the thin film diffusion gradient technique. Two-dimensional high-resolution distribution information, combined with hydrochemistry and sediment phosphorus speciation analysis. The distribution of P-Fe-S in sediment and its controlling factors were discussed. The results showed that the concentration of DGT-P at the sediment-water interface varied from 0.0043 mg 路L ~ (-1) to 0.43 mg 路L ~ (-1). The concentration of DGT-Fe varied from 2. 83mg 路L ~ (-1) to 0. 0083mg 路L ~ (-1). The concentration of DGT-S varies from 0. 10 mg 路L ~ (-1) to 0. 10 mg 路L ~ (-1). There is no significant correlation in the vertical distribution of phosphorus, iron and sulfur in the sediment pore water of Aha Reservoir. DGT-Fe even shows reverse variation, which is obviously different from the results of many lakes, which may be due to the high ratio of Fe/P and Fe/S in the sediment of Aha Reservoir. Excess Fe results in the precipitation of reduced S in the form of FeS/FeS_2. P is still immobilized in sediment by Fe (鈪，

本文编号：1463277