Assessing the Effects of Acidification on N Dynamics in Jiyun River System of Tianjin, China.
Alterations in pH have significant effects on nitrification and denitrification processes in aquatic systems. The Jiyun River in northern China experiences significant acid precipitation, and as such was selected to investigate the effects of decreasing pH (river pH at 8.2, pH at 6 and 5) on N dynamics via incubation experiments (35 and 10°C). Statistical results indicated that the NO3 (-) concentrations of the control (pH at 8.2) were either significantly lower (at 35°C) or significantly higher (at 10°C) than the treatments of pH at 6 and 5 at the alpha level of 0.05 in the incubation. However, the NO3 (-) concentrations of the two pH treatments showed significant difference during part of the reaction stage at 35°C and no difference at 10°C. Analysis indicated that nitrification and coupled nitrification-aerobic denitrification occurred for all treatments, which resulted in NO3 (-) being either accumulated or removed at the end of the incubation.
Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China.
Dongmei
D
Xue
Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China.|Urban and Environmental Science College, Tianjin Normal University, Tianjin, 300387, China.
Mengfan
M
Yang
Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin, 300387, China. wangzhongliang@vip.skleg.cn.|State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China. wangzhongliang@vip.skleg.cn.
Zhong-Liang
ZL
Wang
D002681:China; D058440:Denitrification; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D058465:Nitrification; D045483:Rivers / Q000737:chemistry*; D060753:Water Quality
Acid precipitation; Coupled nitrification-aerobic denitrification; Decreasing pH; Nitrification