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
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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