Hydropower reservoirs on the upper Mekong River modify nutrient bioavailability downstream.
Hydropower reservoirs on the upper Mekong River modify nutrient bioavailability downstream.
复制标题
湄公河上游的水电站改变了下游的养分生物利用度
DOI:
10.1093/nsr/nwaa026
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发表时间:
2020-09
影响因子:
20.6
通讯作者:
Yi Q
中科院分区:
文献类型:
--
作者:
Chen Q;Shi W;Huisman J;Maberly SC;Zhang J;Yu J;Chen Y;Tonina D;Yi Q
Abstract Hydropower development is the key strategy in many developing countries for energy supply, climate-change mitigation and economic development. However, it is commonly assumed that river dams retain nutrients and therefore reduce downstream primary productivity and fishery catches, compromising food security and causing trans-boundary disputes. Contrary to expectation, here we found that a cascade of reservoirs along the upper Mekong River increased downstream bioavailability of nitrogen and phosphorus. The dams caused phytoplankton density to increase with hydraulic residence time and stratification of the stagnant reservoirs caused hypoxia at depth. This allowed the release of bioavailable phosphorus from the sediment and an increase in dissolved inorganic nitrogen as well as a shift in nitrogen species from nitrate to ammonium, which were transported downstream by the discharge of water from the base of the dam. Our findings provide a new perspective on the environmental impacts of river dams on nutrient cycling and ecosystem functioning, with potential implications for sustainable development of hydropower worldwide.
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