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首页> 外文期刊>Journal of Hydrology >Enhanced riparian denitrification in reservoirs following hydropower production
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Enhanced riparian denitrification in reservoirs following hydropower production

机译：水电生产后水库中的河岸反硝化增强

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摘要

It is commonly assumed that dams retain nutrients and cause eutrophication in reservoirs after impoundment. In this study, we explored denitrification in a riparian zone at the land-water interface in a hydropower reservoir of the upper Mekong River. Results demonstrated that hydropower production intensified water level fluctuations in the reservoir and significantly accelerated riparian denitrification process at the land-water interface; the denitrification rate exhibited a strong positive relationship with the period of water level rising-falling cycle (r(2) = 0.98, P < 0.05). Intensified water level fluctuations created frequently alternate wetting-drying cycles and enhanced hyporheic exchanges in the riparian zone, which accelerated organic carbon mineralization and thereby increased carbon source supply to fuel denitrification. In addition, river impoundment after dam construction appreciably enlarged the hot spots for riparian denitrification. The accelerated denitrification as well as the enlarged hot spots area jointly enhanced nitrogen removal from impounded rivers. These findings could advance fundamental knowledge on the environmental impacts of hydropower development on rivers.
机译：通常假设大坝保留营养素并在蓄水后导致储层中的富营养化。在这项研究中，我们在湄公河上部水电站落水区的陆路区探讨了河岸区的反硝化。结果表明，水电站生产加强水位在储层中的水位波动，土地水界面的岩土脱氮过程显着加速;反硝化率与水位上升循环期（R（2）= 0.98，P <0.05）表现出强烈的阳性关系。强化水位波动在河岸区产生了经常交替的润湿干燥循环和增强的低于过多的交换，其加速了有机碳矿化，从而增加了碳源供应到燃料脱氮。此外，大坝施工后的河流蓄积明显扩大了河岸反硝化的热点。加速脱氮以及扩大的热点区域联合增强了蓄积河流的氮气去除。这些调查结果可以推进关于水电开发对河流环境影响的基础知识。

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