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| Evolution law of soil salinity in cotton fields with long-term drip irrigation under membrane |
| GAO Shuanglong1,2, LI Wenhao1,2*, WANG Zhenhua1,2, LI Haiqiang1,2 |
| 1. College of Water Conservancy & Architectural Engineering, Shihezi, Xinjiang University, Shihezi, Xinjiang 832003, China; 2. Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production & Construction Crop, Shihezi, Xinjiang 832003, China |
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Abstract 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 irrigation 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 a were analyzed and presented. The results showed that within 4 a of drip irrigation, the cotton field was saline, and the total soluble salt decreased rapidly from the initial 20.44 g/kg to 7.98 g/kg, and the cotton yield and survival rate increased rapidly. After 12 a of drip irrigation, the total soluble salt of cotton field <2.57 g/kg, the cotton field belongs to non-salinized soil, and the cotton survi-val 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-/SO2-4)(the ratio of the mass ratio of Cl- and SO2-4)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 decreased year by year, and the composition of anions and cations has also changed year by year, and the leaching effect of Cl- was better than that of SO2-4.
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Received: 23 August 2023
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