本文關(guān)鍵詞： 阿哈水庫 沉積物-水界面 薄膜擴(kuò)散梯度技術(shù) 磷 硫 鐵　出處：《環(huán)境科學(xué)》2017年07期 　論文類型：期刊論文

【摘要】：選取貴州典型高原亞深水型湖庫阿哈水庫為研究對象,利用薄膜擴(kuò)散梯度技術(shù)獲取夏季分層期不同湖區(qū)沉積物-水界面磷、鐵、硫的原位、二維高分辨分布信息,并結(jié)合水化學(xué)及沉積物磷形態(tài)分析,探討了沉積物P-Fe-S分布規(guī)律及控制因素.結(jié)果表明:沉積物-水界面DGT-P的濃度變化范圍0.00~0.43 mg·L~(-1),DGT-Fe的濃度變化范圍0.00~2.83 mg·L~(-1),DGT-S的濃度變化范圍0.00~0.10 mg·L~(-1).阿哈水庫沉積物孔隙水磷、鐵、硫濃度在垂向分布上沒有顯著的相關(guān)性,DGT-P、DGT-Fe甚至還呈反向變化,這與很多湖泊的研究結(jié)果存在明顯差異,其原因可能是阿哈水庫沉積物具有很高的Fe/P和Fe/S比值,過剩的Fe導(dǎo)致還原態(tài)S以FeS/FeS_2形式沉淀后,P仍然被Fe(Ⅲ)固定在沉積物中.阿哈水庫沉積物磷形態(tài)以Na OH-SRP和BD-P為主,Na OH-SRP含量變化范圍為192~604 mg·kg~(-1),平均值約為392 mg·kg~(-1),BD-P含量變化范圍為143~524mg·kg~(-1),平均值約為225 mg·kg~(-1).阿哈水庫底層水體長期處于厭氧環(huán)境,Fe、S地球化學(xué)循環(huán)對沉積物內(nèi)源磷釋放起著重要控制作用.
[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，

本文編號：1463277