南亞熱帶地區(qū)水庫夏季鐵、錳垂直分布特征
發(fā)布時間：2018-08-16 16:51
【摘要】：鐵(Fe)和錳(Mn)均為氧化還原敏感性元素,是水質(zhì)評價的重要指標(biāo)之一.為了解南亞熱帶地區(qū)供水水庫夏季Fe、Mn的垂直分布特征,于2016年7月調(diào)查了粵東地區(qū)9座水庫敞水區(qū)湖沼學(xué)變量和Fe、Mn濃度的垂直分布特征.在有明顯溫度分層的深水水庫中Fe、Mn存在顯著的梯度分布,表層水體中總Fe(TFe)、總Mn(TMn)以及溶解性Fe、Mn(DFe、DMn)的濃度顯著(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)低于底層.5座深水水庫底層水體中TFe、TMn平均濃度分別為0.399 mg·L~(-1)和0.422 mg·L~(-1),其中溶解態(tài)離子占70%以上,而在沒有明顯溫度分層的淺水水庫中,表層水體TFe、TMn以及DFe、DMn濃度略低于底層但無顯著性差異(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座淺水水庫底層水體中TFe、TMn平均濃度分別為0.110 mg·L~(-1)和0.089 mg·L~(-1),且主要以非溶解態(tài)存在.水體中TFe和DFe濃度與溶解氧(DO)濃度、p H值和深度呈顯著相關(guān)關(guān)系(P0.05),與總磷(TP)、總氮(TN)濃度沒有顯著相關(guān)性.水體熱分層及高的水體穩(wěn)定性導(dǎo)致DO和p H值呈現(xiàn)明顯的梯度分布,是導(dǎo)致深水水庫Fe、Mn在水層間形成梯度分布的關(guān)鍵原因.深水水庫底層水體低DO濃度和酸性條件有利于沉積物中Fe、Mn的釋放,是導(dǎo)致Fe、Mn以溶解態(tài)存在的主要原因.同時,以紅壤為主的土壤類型可能是該地區(qū)水體中Fe、Mn普遍較高的重要原因.以上結(jié)果表明,南亞熱帶地區(qū)夏季分層穩(wěn)定的深水水庫底層水體普遍存在Fe、Mn較高的現(xiàn)象,以深層取水的供水方式易出現(xiàn)Fe、Mn濃度超標(biāo),湖上層取水則可避免該問題.
[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.
【作者單位】： 暨南大學(xué)水生生物研究中心;廣東省水文局汕頭水文分局;廣東省水庫藍藻水華防治中心;
【基金】：廣東省水利科技創(chuàng)新項目(2016-29) 廣東省應(yīng)用型重大項目(2015B020235007)
【分類號】：X524
本文編號：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.
【作者單位】： 暨南大學(xué)水生生物研究中心;廣東省水文局汕頭水文分局;廣東省水庫藍藻水華防治中心;
【基金】：廣東省水利科技創(chuàng)新項目(2016-29) 廣東省應(yīng)用型重大項目(2015B020235007)
【分類號】：X524
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