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Modeling effects of different irrigation managements on root-zone soil salinity |
Chen Yanmei1,2, Wang Shaoli1,2, Gao Zhanyi1,2, Guan Xiaoyan1,2, Hu Yaqiong1,2 |
1.National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 2. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China |
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Abstract Taking Shahao canal irrigation region in Hetao irrigation district as an example, effects of different irrigation management on root-zone soil salinity were explored based on the SaltMod model in the paper. The model was calibrated and validated by using the data in 2008—2010, then the root-zone soil salinity in that region was simulated and predicted. The results showed that under the present irrigation and drainage conditions, the soil salinity not only stayed in a stable level, but has exhibited a slightly desalinated tendency, it was predicted that the root-zone salinity would be reduced by 3% after 10 years. During crop growth stage, the exchange between water and salt is remarked in the vertical direction; to control the soil salinity, irrigation water amount should be kept as small as possible. In winter, the root-zone soil salinity was decreased with increasing irrigation quota, but the slope of increase in the salinity was gradually decreased. According to the crop planting structure in a local irrigation district and comprehensively considering water saving irrigation, crop production, water and salt concentrations in the soil of root-zone, it is suggested that optimal irrigation net quota should be 2 700-3 500 m3/hm2 in crop growth stage, the quota in winter should be about 2 700 m3/hm2.
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Received: 11 December 2012
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