Arid Zone Research ›› 2021, Vol. 38 ›› Issue (4): 1010-1019.doi: 10.13866/j.azr.2021.04.12

• Soil Resources • Previous Articles     Next Articles

Effect of drip irrigation under mulch combined with drainage by concealed pipes on soil leaching in Xinjiang

WANG Dongwang1,2(),WANG Zhenhua1,2(),CHEN Lin3,LI Wenhao1,2   

  1. 1. College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
    2. Key Laboratory of Modern Water Saving Irrigation of Xinjiang Bingtuan,Shihezi 832000, Xinjiang, China
    3. Xinjiang Tianye Water-Saving Irrigation Co. LTD,Shihezi 832000, Xinjiang, China
  • Received:2020-12-10 Revised:2021-04-22 Online:2021-07-15 Published:2021-08-03
  • Contact: Zhenhua WANG E-mail:1339147708@qq.com;wzh2002027@163.com

Abstract:

Drip irrigation under film combined with subsurface drainage technology is a type of composite water-saving irrigation and drainage technology. We conducted field experiments in the Anjihai area of 141 production and construction corporations of Xinjiang using three different treatments to study the effect of the technology of drip irrigation under mulch combined with the drainage of underground pipes on the soil leaching effect: Drip irrigation under mulch combined with the drainage of underground pipes (T1), drip irrigation under mulch without the drainage of underground pipes (T2), and drip irrigation without the drainage of underground pipes (T3). We found that under the same soil layer, the changes in the soil moisture content of T1, T2, and T3 treatments were 6.32%, 10.03%, and 14.32%, respectively, which indicated that the T1 treatment could better maintain the stability of soil moisture than the T2 and T3 treatments, and the soil water conservation effect of different treatments was T1>T2>T3. The soil salt content of the 0-60 cm soil layer decreased in the T1 treatment, and it was 63.06%, 60.62%, and 48.42% in the 20 cm, 40 cm, and 60 cm soil layers, respectively. The soil salt content of the 20 cm and 40 cm soil layers decreased in the T2 treatment, but it increased in the 60 cm soil layer, indicating that desalination of the surface soil caused salt accumulation in the deep soil layer, and the surface salt returned in the T3 treatment, at the end of growth period. At the end of the cotton-growing period, the content of soil organic matter increased in the 20 cm, 40 cm, and 60 cm soil layers, but it decreased in the T2 and T3 soil layers without concealed pipes. With the increase in soil depth, the permeability of the soil improved within 0-60 cm. The pH and salt content of the water discharged by the concealed pipe were higher than that of the irrigation water, which indicates that the concealed pipe drained away the salt in the soil at the same time, which is helpful for the improvement of soil salinity and alkalinity. The study provides a theoretical basis for the improvement and management of saline, alkali land in Xinjiang.

Key words: cotton, drip irrigation under mulch, concealed pipe drainage, salt leaching, Xinjiang