Impact of closed sabo dams on manganese concentration change in mountainous streams
Impact of closed sabo dams on manganese concentration change in mountainous streams
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DOI：
10.1080/15715124.2016.1209510
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发表时间：
2017-01
影响因子：
2.5
通讯作者：
Susan Praise;Toru Watanabe;Kazuya Watanabe;Hiroaki Ito;H. Okubo
中科院分区：
文献类型：
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作者：
Susan Praise;Toru Watanabe;Kazuya Watanabe;Hiroaki Ito;H. Okubo
抽象的“萨博”水坝是日本山区的常见特征。它们的主要重要性是减少偶尔发生的自然灾害造成的影响。然而，沙波大坝的存在可能会改变河流的过程，如有机和无机物质的地球化学行为。沉积物的滞留和积累增加会影响铁和锰等重要元素的循环。有机质埋藏在溪流下方和溪流旁边的土壤质地分层图案中。这些条件带来氧化还原条件的变化以及厌氧分解，从而影响包括锰在内的各种元素的生物地球化学行为。在这项研究中，研究了关闭的沙波大坝对锰的地球化学行为的影响。用甲醛肟法测定了沙坝溪流中的锰浓度。结果显示，关闭的萨博大坝下游的锰浓度有所上升，最高增幅为2012年8月的276%。锰含量变化范围为0.14~0.01 mg/L，并受季节和坝址的影响。在所调查的所有地点，都注意到了沙波大坝中锰浓度的变化。萨博大坝建成后，锰浓度随采样时间的不同而增加，这表明关闭的萨博大坝内的氧化锰/氢氧化物减少。
ABSTRACT ‘Sabo’ dams are common features in the mountainous areas of Japan. Their major importance is to reduce the impact caused by occasional natural disasters. However, the existence of sabo dams may alter streams process such as the geochemical behaviour of organic and inorganic materials. Elevated retention and accumulation of sediments affect cycling of important elements such as iron and manganese (Mn). Organic matter is buried in layered patterns of soil textures beneath and alongside the streams. Such conditions bring change in redox conditions together with anaerobic decomposition, which affects the biogeochemical behaviour of various elements including Mn. In this study, the impact of closed sabo dams on the geochemical behaviour of Mn was investigated. Using the formaldoxime method, Mn concentration in sabo-dammed streams was determined. The results showed an increase in Mn concentration in the downstream of closed sabo dams with the highest increase of 276% in August 2012. Mn concentration varied in the range of 0.14 to <0.01 mg/l and it was retaliated to the season and dam location. Changes of Mn concentration in sabo dams were noted in all sites investigated. Mn concentration increased after sabo dams depending on the time of sampling, indicating reduction of Mn oxide/hydroxides within the closed sabo dams.