南亚热带地区水库夏季铁、锰垂直分布特征
发布时间：2018-08-16 16:51
【摘要】：铁(Fe)和锰(Mn)均为氧化还原敏感性元素,是水质评价的重要指标之一.为了解南亚热带地区供水水库夏季Fe、Mn的垂直分布特征,于2016年7月调查了粤东地区9座水库敞水区湖沼学变量和Fe、Mn浓度的垂直分布特征.在有明显温度分层的深水水库中Fe、Mn存在显著的梯度分布,表层水体中总Fe(TFe)、总Mn(TMn)以及溶解性Fe、Mn(DFe、DMn)的浓度显著(TFe,F=6.708,P=0.032;TMn,F=9.720,P=0.014;DFe,F=8.129,P=0.029;DMn,F=11.125,P=0.016)低于底层.5座深水水库底层水体中TFe、TMn平均浓度分别为0.399 mg·L~(-1)和0.422 mg·L~(-1),其中溶解态离子占70%以上,而在没有明显温度分层的浅水水库中,表层水体TFe、TMn以及DFe、DMn浓度略低于底层但无显著性差异(TFe,F=0.135,P=0.726;TMn,F=0,P=1;DFe,F=0.006,P=0.943;DMn,F=0.007,P=0.936),4座浅水水库底层水体中TFe、TMn平均浓度分别为0.110 mg·L~(-1)和0.089 mg·L~(-1),且主要以非溶解态存在.水体中TFe和DFe浓度与溶解氧(DO)浓度、p H值和深度呈显著相关关系(P0.05),与总磷(TP)、总氮(TN)浓度没有显著相关性.水体热分层及高的水体稳定性导致DO和p H值呈现明显的梯度分布,是导致深水水库Fe、Mn在水层间形成梯度分布的关键原因.深水水库底层水体低DO浓度和酸性条件有利于沉积物中Fe、Mn的释放,是导致Fe、Mn以溶解态存在的主要原因.同时,以红壤为主的土壤类型可能是该地区水体中Fe、Mn普遍较高的重要原因.以上结果表明,南亚热带地区夏季分层稳定的深水水库底层水体普遍存在Fe、Mn较高的现象,以深层取水的供水方式易出现Fe、Mn浓度超标,湖上层取水则可避免该问题.
[Abstract]:Iron (Fe) and manganese (Mn) are redox sensitive elements and are one of the important indexes in water quality evaluation. In order to understand the vertical distribution characteristics of Fe ~ (2 +) mn in summer of water supply reservoirs in subtropical region, the authors investigated the vertical distribution characteristics of limnological variables and Fe ~ (2 +) mn concentrations in open water areas of 9 reservoirs in eastern Guangdong in July 2016. In deep-water reservoirs with obvious temperature stratification, there is a significant gradient distribution of Fe ~ (2 +) mn. The concentrations of total Fe (TFe), total Mn (TMn) and dissolved FeOmn (DFeODMn) in the surface water were significantly lower than those in the bottom water (TFeFJ 6.708, P0. 032, TMnF0. 720, P0. 014, DFe0. 014, P0. 029, DMN, F11.125, P0. 016), respectively, and the average concentrations of TFeTmn in the bottom water of deep water reservoirs were 0.399 mg L-1 and 0.422 mg L-1, respectively, and the dissolved state ions accounted for more than 70%. However, in shallow water reservoirs without obvious temperature stratification, the concentrations of TFeTmn and DFeODMn in the surface water were slightly lower than those in the bottom layer, but there was no significant difference between them (TFeF0. 135, P0. 726 TMnF0. 006, P0. 943 DMnF0. 007, P0. 936). The average concentrations of TFeTmn in the bottom water of 4 shallow water reservoirs were 0.110 mg L-1 and 0.089 mg L-1, respectively, and were mainly insoluble. The concentrations of TFe and DFe were significantly correlated with the concentration of dissolved oxygen (DO) (P0.05), but not with the concentration of total nitrogen (TN) of total phosphorus (TP),). Water thermal stratification and high water stability lead to obvious gradient distribution of do and pH values, which is the key reason for the formation of gradient distribution of FeMn among water layers in deep water reservoirs. The low do concentration and acidic conditions in the bottom water of deep water reservoir are favorable to the release of Fe ~ (2 +) mn from sediments, which is the main reason for the existence of Fe ~ (2 +) mn in a dissolved state. At the same time, the main soil type of red soil may be the important reason for the high Feo mn in the water body in this area. The above results show that in the deep water of deep water reservoirs in the subtropical region in summer, the phenomenon of high Feo mn concentration is common in the bottom water of deep water reservoirs, and the concentration of Fe + mn in the deep water supply mode is easy to exceed the standard, which can be avoided in the upper layer of the lake.
【作者单位】： 暨南大学水生生物研究中心;广东省水文局汕头水文分局;广东省水库蓝藻水华防治中心;
【基金】：广东省水利科技创新项目(2016-29) 广东省应用型重大项目(2015B020235007)
【分类号】：X524
本文编号：2186590
[Abstract]:Iron (Fe) and manganese (Mn) are redox sensitive elements and are one of the important indexes in water quality evaluation. In order to understand the vertical distribution characteristics of Fe ~ (2 +) mn in summer of water supply reservoirs in subtropical region, the authors investigated the vertical distribution characteristics of limnological variables and Fe ~ (2 +) mn concentrations in open water areas of 9 reservoirs in eastern Guangdong in July 2016. In deep-water reservoirs with obvious temperature stratification, there is a significant gradient distribution of Fe ~ (2 +) mn. The concentrations of total Fe (TFe), total Mn (TMn) and dissolved FeOmn (DFeODMn) in the surface water were significantly lower than those in the bottom water (TFeFJ 6.708, P0. 032, TMnF0. 720, P0. 014, DFe0. 014, P0. 029, DMN, F11.125, P0. 016), respectively, and the average concentrations of TFeTmn in the bottom water of deep water reservoirs were 0.399 mg L-1 and 0.422 mg L-1, respectively, and the dissolved state ions accounted for more than 70%. However, in shallow water reservoirs without obvious temperature stratification, the concentrations of TFeTmn and DFeODMn in the surface water were slightly lower than those in the bottom layer, but there was no significant difference between them (TFeF0. 135, P0. 726 TMnF0. 006, P0. 943 DMnF0. 007, P0. 936). The average concentrations of TFeTmn in the bottom water of 4 shallow water reservoirs were 0.110 mg L-1 and 0.089 mg L-1, respectively, and were mainly insoluble. The concentrations of TFe and DFe were significantly correlated with the concentration of dissolved oxygen (DO) (P0.05), but not with the concentration of total nitrogen (TN) of total phosphorus (TP),). Water thermal stratification and high water stability lead to obvious gradient distribution of do and pH values, which is the key reason for the formation of gradient distribution of FeMn among water layers in deep water reservoirs. The low do concentration and acidic conditions in the bottom water of deep water reservoir are favorable to the release of Fe ~ (2 +) mn from sediments, which is the main reason for the existence of Fe ~ (2 +) mn in a dissolved state. At the same time, the main soil type of red soil may be the important reason for the high Feo mn in the water body in this area. The above results show that in the deep water of deep water reservoirs in the subtropical region in summer, the phenomenon of high Feo mn concentration is common in the bottom water of deep water reservoirs, and the concentration of Fe + mn in the deep water supply mode is easy to exceed the standard, which can be avoided in the upper layer of the lake.
【作者单位】： 暨南大学水生生物研究中心;广东省水文局汕头水文分局;广东省水库蓝藻水华防治中心;
【基金】：广东省水利科技创新项目(2016-29) 广东省应用型重大项目(2015B020235007)
【分类号】：X524
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