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Varying water column stability controls the denitrification process in a subtropical reservoir, Southwest China

Authors :
Siqi Li
Qinkai Li
Xiao-Dong Li
Hong Lv
Gaoyang Cui
Shiyuan Ding
Yiyao Wang
Mengdi Yang
Source :
Journal of environmental sciences (China). 111
Publication Year :
2020

Abstract

Reservoirs are regarded as hotspots of nitrogen transformation and potential sources of nitrous oxide (N2O). However, it remains unclear how the hydrological conditions due to dam construction control the processes of nitrogen transformation in reservoir waters. To address this issue, we examined the spatial-temporal characteristics of nitrate concentrations, δ15N-NO3-, δ18O-NO3-, δ18O-H2O, relative water column stability (RWCS), and related environmental factors in a subtropical eutrophic reservoir (Hongfeng Reservoir, HFR), Southwest China. We found that denitrification was the most important nitrogen transformation process in the HFR and that higher denitrification intensity was associated with increased RWCS in summer, which suggested hydrological control of the denitrification process. In contrast, low RWCS conditions favored the nitrification process in the HFR in winter. Additionally, dissolved oxygen (DO; p

Details

ISSN :
10010742
Volume :
111
Database :
OpenAIRE
Journal :
Journal of environmental sciences (China)
Accession number :
edsair.doi.dedup.....b92073ad4e2227cbb300b098fddf9d3b