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Varying water column stability controls the denitrification process in a subtropical reservoir, Southwest China
- 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
- Subjects :
- China
Environmental Engineering
Denitrification
010504 meteorology & atmospheric sciences
Nitrogen
chemistry.chemical_element
Subtropics
010501 environmental sciences
01 natural sciences
chemistry.chemical_compound
Water column
Nitrate
Rivers
Environmental Chemistry
0105 earth and related environmental sciences
General Environmental Science
Nitrates
Water
General Medicine
Nitrous oxide
Nitrification
chemistry
Environmental chemistry
Environmental science
Eutrophication
Environmental Monitoring
Subjects
Details
- ISSN :
- 10010742
- Volume :
- 111
- Database :
- OpenAIRE
- Journal :
- Journal of environmental sciences (China)
- Accession number :
- edsair.doi.dedup.....b92073ad4e2227cbb300b098fddf9d3b