SWAP simulation of rotational irrigation models with saline and fresh water for seed maize in Shiyang River Basin
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DOI:10.7606/j.issn.1000-7601.2019.04.01
Key Words: saline water  rotation irrigation  seed maize  SWAP model  soil water and salinity balance  Shiyang River Basin
Author NameAffiliation
YUAN Cheng-fu College of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
Jiangxi Water Resources Institute, Nanchang, Jiangxi 330013, China 
FENG Shao-yuan College of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
Centre for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China 
JI Quan-yi College of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China 
HUO Zai-lin Centre for Agricultural Water Research in China, China Agricultural University, Beijing 100083, China 
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Abstract:
      In order to explore rotation irrigation models with saline and fresh water for seed maize in Shiyang River Basin, the SWAP model was calibrated and validated with the field experimental data collected from 2014. The SWAP model was used to simulate soil water and salinity balance under different rotation irrigation models with saline and fresh water. The optimal rotation irrigation models with saline and fresh water for seed maize were screened out by calculating and analyzing soil water and salinity balance. The SWAP model was also predicted long-term effects of soil salt dynamic and seed maize yield. The results showed that the RMSE values were all lower than 0.05 cm3·cm-3 and the MRE values were lower than 15% in soil water content calibration and validation. The RMSE values were all lower than 4.2 mg·cm-3 and the MRE values were lower than 25% in soil salinity calibration and validation. The RMSE and MRE values were less than 380 kg·hm-2 and 10% in seed maize yield calibration and validation, respectively. The SWAP model can be used as a management tool for simulation and prediction of rotation irrigation models with saline and fresh water in the study area. The SWAP model could properly reflect the change tendency of the measured values. The optimal rotation irrigation models were the irrigation of two times of fresh water and one time of saline water, one time of fresh water and two times of saline water under brackish water irrigation of 3.0 g·L-1, and two times of fresh water and one time of saline water under saline water irrigation of 6.0 g·L-1. These three optimal rotation irrigation models could achieve the aim of reducing soil salt accumulation in soil and improving seed maize yield. The long-term simulation and prediction indicated that soil salt content and seed maize yield could remain relatively stable for simulation period of time in the optimal irrigation models of seed maize. These three optimal rotation irrigation models would not result in soil secondary salinization and small reduction in seed maize production. The optimal irrigation models have guiding significance to effective irrigation of underground saline water in Shiyang River Basin.
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