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Impacts of water residence time on nitrogen budget of lakes and reservoirs
- Source :
- Science of The Total Environment. 646:75-83
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- As an important factor related to the self-purification capacity (e.g. denitrification, burial rate, and downstream output) in aquatic systems, water residence time (WRT) has great impacts on the nitrogen (N) dynamics and its removal process in lakes and reservoirs. In this study, we have analysed the impacts of WRT on the change rates of total nitrogen (TN) concentrations in 50 waterbodies (including 33 lakes and 17 reservoirs) in China, with different change trends (e.g. increasing trends and decreasing trends) and TN concentrations during 2012–2016. Based on the annual ecosystem-scale N mass balance, TN input and output flux in the waterbodies are estimated. The results showed that the decreases of TN concentrations usually occur in the waterbodies with the relatively high TN concentrations in 2012, and WRT has significant impacts on the TN change rates in the waterbodies. Longer WRT could slow down the TN increasing rates in the waterbodies acting as N sinks, but could accelerate the removal from the waterbodies acting as N sources. Higher water phosphorus (P) concentrations could also be beneficial for the faster N removal from the waterbodies, which is mediated via the coupled processes regulating the N transfer from water column to anoxic sediments. China has recently issued the “lake-chief” systems, addressing the specific and flexible strategies for water pollution control in different lakes. The self-purification capacity through denitrification and burial rate, which are closely related to WRT, should be taken into consideration when making specific water management plans in the future.
- Subjects :
- Hydrology
Pollution
Environmental Engineering
Denitrification
010504 meteorology & atmospheric sciences
Phosphorus
Aquatic ecosystem
media_common.quotation_subject
Sediment
chemistry.chemical_element
010501 environmental sciences
01 natural sciences
Nitrogen
Water column
chemistry
Environmental Chemistry
Environmental science
Water pollution
Waste Management and Disposal
0105 earth and related environmental sciences
media_common
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 646
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....c971860aa0154e52c9bb454d8c9100e8