Prediction of salt transport in different soil textures under drip irrigation in an arid zone using the SWAGMAN Destiny model
Haichang Yang A , Yun Chen B , Fenghua Zhang A D , Tingbao Xu C and Xu Cai AA Agricultural College, Shihezi University, Shihezi City, Xinjiang 832003, China.
B CSIRO Land and Water, Canberra, ACT 2601, Australia.
C Fenner School of Environment and Society, The Australian National University, Canberra, ACT 2601, Australia.
D Corresponding author. Email: zfh2000@126.com
Soil Research 54(7) 869-879 https://doi.org/10.1071/SR15169
Submitted: 13 June 2015 Accepted: 1 March 2016 Published: 22 August 2016
Abstract
In recent years, Xinjiang Oasis has faced a major challenge of increasing risk of secondary salinization caused by drip irrigation under plastic mulch. Predicting the salt balance is therefore essential for understanding how to sustain the use of salinized land in this arid area. This research validated the SWAGMAN (Salt, Water And Groundwater MANagement) Destiny model to simulate and forecast the movement of salt in different soil textures based on field experiments. The results were verified with extensive field work in Shihutan, Xinjiang, China. They show that soil salinity decreases in the upper layers and increases in the bottom layers of the investigated soil profile. The desalinization rate in sand, which shows an overall steady trend throughout the soil profile, is generally higher than that in loam and clay. The depth of 60 cm is critical for loam and clay; soil salinity decreases above it but increases below it. Model sensitivity analysis reveals the variation of soil salinity is independent of the initial electrical conductivity setting of SWAGMAN Destiny simulations. This study indicates that numerical modelling is a useful approach for efficiently estimating the salt balance under drip irrigation. The result provides a scientific basis for making adaptive strategies to manage salinised farmlands in arid zones.
Additional keywords: arid area, drip irrigation, soil salinity, soil texture, SWAGMAN Destiny.
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