Evolution law of soil salinity in cotton fields with long-term drip irrigation under membrane
In order to explore whether there is a problem of soil salt accumulation in cotton fields with long-term application of membrane drip irrigation technology,continuous fixed-spot monitoring of total soluble salts and ions in soils of five saline cotton fields with different years of under-membrane drip ir-rigation was carried out in Manas River Irrigation District,Xinjiang,from 2009 to 2013.The spatial and temporal evolution patterns of total soluble salts and ions and changes in salt composition in saline cotton fields under the current irrigation system with the application of drip irrigation under membrane for 1-16 years were analyzed and presented.The results show that within 4 years of drip irrigation,the cotton field is saline,and the total soluble salt decreases rapidly from the initial 20.44 g/kg to 7.98 g/kg,and the cotton yield and survival rate increased rapidly.After 12 years of drip irrigation,the to-tal soluble salt of cotton field is less than 2.57 g/kg,the cotton field belongs to non-salinized soil,and the cotton survival rate is basically stable at more than 84.53％,and with a yield are more than 5 100 kg/hm2.With the extension of drip irrigation,the sodium adsorption ratio(SAR)and w(Cl-/S04-)(the ratio of the mass ratio of Cl-and SO4-)of the soil of cotton field are decreasing,indicating that the alkalinity of the soil under the current irrigation system has been reduced yearly.Under the current irrigation system,the soil alkalinity decreases year by year,and the composition of anions and cations has also changed year by year,and the leaching effect of Cl-is better than that of SO2.
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