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Effects of water quality of the basin caused by nitrogen loss from soil in drought

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Abstract

Under the background of climate change and man-made alterations to the environment, there has been an increase in the frequency of droughts and the range of their impact. Droughts may give rise to a series of resource, environmental and ecological effects, i.e., water shortage, water quality deterioration, as well as the decrease in the diversity of aquatic organisms. This paper, above all, identifies the impact mechanism of drought on the surface water quality of the basin, and then systematically studies the laws of generation, transfer, transformation and degradation of pollutants during the drought, finding that the alternating droughts and floods stage is the critical period during which the surface water quality is affected. Secondly, through employing indoor orthogonality experiments, serving drought degree, rainfall intensity and rainfall duration as the main elements and designing various scenario models, the study inspects the effects of various factors on the nitrogen loss in soil, as well as the loss of nonpoint source pollution and the leaching rate of nitrogen under the different alternating scenarios of drought and flood. It comes to the conclusion that the various factors and the loss of nonpoint source pollution are positively correlated, and under the alternating scenarios of drought and flood, there is an exacerbation in the loss of ammonium nitrogen and nitrate nitrogen in soil, which generates the transfer and transformation mechanisms of nonpoint source pollution from a micro level.

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Acknowledgments

This research work was supported by the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Grant No. IWHR-SKL-201406. This work was supported by the General Program of the National Natural Science Foundation of China (Grant No. 51409266). It also funded by NSFC (51309129, 51269020), Jiang’xi educational committee (GJJ13752), Jiang’xi science and technology department (20123BBG70215, 2013ZBAB203003).

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Correspondence to B. B. Huang.

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Huang, B.B., Yan, D.H., Wang, H. et al. Effects of water quality of the basin caused by nitrogen loss from soil in drought. Nat Hazards 75, 2357–2368 (2015). https://doi.org/10.1007/s11069-014-1433-8

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  • DOI: https://doi.org/10.1007/s11069-014-1433-8

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