Simulating water and nitrogen loss from an irrigated paddy field under continuously flooded condition with Hydrus-1D model View Full Text


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Article Info

DATE

2017-05-11

AUTHORS

Rui Yang, Juxiu Tong, Bill X. Hu, Jiayun Li, Wenshuo Wei

ABSTRACT

Agricultural non-point source pollution is a major factor in surface water and groundwater pollution, especially for nitrogen (N) pollution. In this paper, an experiment was conducted in a direct-seeded paddy field under traditional continuously flooded irrigation (CFI). The water movement and N transport and transformation were simulated via the Hydrus-1D model, and the model was calibrated using field measurements. The model had a total water balance error of 0.236 cm and a relative error (error/input total water) of 0.23%. For the solute transport model, the N balance error and relative error (error/input total N) were 0.36 kg ha−1 and 0.40%, respectively. The study results indicate that the plow pan plays a crucial role in vertical water movement in paddy fields. Water flow was mainly lost through surface runoff and underground drainage, with proportions to total input water of 32.33 and 42.58%, respectively. The water productivity in the study was 0.36 kg m−3. The simulated N concentration results revealed that ammonia was the main form in rice uptake (95% of total N uptake), and its concentration was much larger than for nitrate under CFI. Denitrification and volatilization were the main losses, with proportions to total consumption of 23.18 and 14.49%, respectively. Leaching (10.28%) and surface runoff loss (2.05%) were the main losses of N pushed out of the system by water. Hydrus-1D simulation was an effective method to predict water flow and N concentrations in the three different forms. The study provides results that could be used to guide water and fertilization management and field results for numerical studies of water flow and N transport and transformation in the future. More... »

PAGES

15089-15106

References to SciGraph publications

  • 2006-02-10. The development of a coupled model (PCPF-SWMS) to simulate water flow and pollutant transport in Japanese paddy fields in PADDY AND WATER ENVIRONMENT
  • 2015-03-11. Application of modified export coefficient method on the load estimation of non-point source nitrogen and phosphorus pollution of soil and water loss in semiarid regions in ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
  • 1996-10. Nitrogen losses and fertilizer N use efficiency in irrigated porous soils in NUTRIENT CYCLING IN AGROECOSYSTEMS
  • 2010-07-27. Simulation of salt and water movement and estimation of water productivity of rice crop irrigated with saline water in PADDY AND WATER ENVIRONMENT
  • 2005-02-23. Nitrogen study fertilizes fears of pollution in NATURE
  • 2012-05-09. Effects of alternate wetting and drying irrigation on percolation and nitrogen leaching in paddy fields in PADDY AND WATER ENVIRONMENT
  • 2011-05-06. Modelling soil water and salt dynamics under pulsed and continuous surface drip irrigation of almond and implications of system design in IRRIGATION SCIENCE
  • 2004-08-19. Nitrogen transport and transformation in packed soil columns from paddy fields in PADDY AND WATER ENVIRONMENT
  • 2012-02-05. Agricultural Non-Point Source Pollution in China: Causes and Mitigation Measures in AMBIO
  • 2006-08-15. Physiological and Molecular Responses of Nitrogen-starved Rice Plants to Re-supply of Different Nitrogen Sources in PLANT AND SOIL
  • 2014-05-03. Prediction of root zone water and nitrogen balance in an irrigated rice field using a simulation model in PADDY AND WATER ENVIRONMENT
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11356-017-9142-y

    DOI

    http://dx.doi.org/10.1007/s11356-017-9142-y

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1085385984

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/28493192


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