Arid Zone Research ›› 2022, Vol. 39 ›› Issue (2): 485-492.doi: 10.13866/j.azr.2022.02.16

• Soil Resources • Previous Articles     Next Articles

Soil salt accumulation characteristics of long-term drip irrigation in cotton fields during non-irrigation seasons

TAN Mingdong1,2(),WANG Zhenhua1,2(),WANG Yue1,2,LI Wenhao1,2,ZONG Rui1,2,ZOU Jie1,2   

  1. 1. College of Water Architectural and Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
    2. Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production and Construction Corps, Shihezi 832000, Xinjiang, China
  • Received:2021-07-19 Revised:2021-09-29 Online:2022-03-15 Published:2022-03-30
  • Contact: Zhenhua WANG E-mail:tanmingdong1998@163.com;wzh2002027@163.com

Abstract:

To explore the changing characteristics of soil water and salt movement in cotton fields with different drip irrigation years during the freezing and thawing process, this study conducted field sampling and monitoring on five plots with different drip irrigation years and a wasteland (CK) in the Xinjiang oasis irrigation area. The soil salt content of the 0-120 cm soil layer decreased significantly as the drip irrigation years increased, and the salt distribution characteristics changed from a surface accumulation type to a uniform type. During the freezing and thawing process, the characteristics of soil salt movement in cotton fields had obvious plot differences, wherein the soil salt in each layer of the wasteland and the cotton field with 17, 19, and 23 drip irrigation years increased, with average salt fluxes of 43.61, 172.57, 38.18, and 10.53 g·m-2·d-1, respectively. 0-60 cm range was the sensitive layer of soil water storage in the drip irrigation cotton field. More specifically, the ablation period was the most active period of water and salt movement in each plot. After freezing and thawing, the soil water storage in this area of the wasteland and the cotton field with 13, 15, 17, 19, and 23 drip irrigation years increased by 23.43 mm, 81.26 mm, 31.68 mm, 62.39 mm, 96.98 mm, and 69.64 mm, respectively. This study reveals trends in soil water and salt transport during the freeze-thaw process and the characteristics of salt accumulation in cotton fields with different drip irrigation years. Results provide scientific guidance for soil management under freeze-thaw conditions in non-irrigation seasons and long-term drip irrigation in Xinjiang.

Key words: drip irrigation cotton field, freeze-thaw, salt flux, salt accumulation, water loss