Dams affect hydrologic cycle and water environment through intercepting river water. Therefore, “impounded rivers” or river reservoirs often affect river basin environments. That has become a worldwide problem, especially the effect on N2O emissions. This study investigates cascade reservoirs in the Wujiang River, and analyzes therelated parameters and N2O concentrations. It has been shown that the cascade development doeshave impacts on water parameters, nitrogen loadings and N2O emission. Saturation of N2O averaged 347% in the entiresurface water represents a N2O source with respect to atmosphere,
under influences of age of reservoirs, nutrient status and organic matters. N2O is emitted more in spring and summer than in winter and autumn. The key factors of influence are T, pH and DO. Organic matters and nutrient status are important in old reservoirs such as the Wujiangdu reservoir. Nitrification is a dominate process for N2O emission in surface water. But for water in discharge, denitrification is a dominate process. The annual average N2O fluxes were 0.33 μmol·m−2·h−1 for river water, 0.64 μmol·m−2·h−1 for discharge water, and 0.43 μmol·m−2·h−1 for surface water in dams. Compared to other surface water
in the world, emission of N2O acts as moderate emission fluxes in the Wujiang River. High concentration in discharge water should be emphasized since it contributes huge amount of N2O emission during hydroelectric production.
LIU Xiao-Long, WANG Fu-Shun, BAI Li, LI Si-Liang, WANG Bao-Li, LIU Cong-Jiang, WANG Zhong-Liang
. Impact of cascade reservoir development on N2O emissions in the Wujiang River[J]. Journal of Shanghai University, 2015
, 21(03)
: 301
-310
.
DOI: 10.3969/j.issn.1007-2861.2015.01.012
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