Arid Zone Research ›› 2023, Vol. 40 ›› Issue (1): 152-162.doi: 10.13866/j.azr.2023.01.16

• Ecology and Environment • Previous Articles    

Study on evapotranspiration of cotton field under drip irrigation in oasis of arid region

LIU Yanxue1,2(),QIAO Changlu1,2()   

  1. 1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
    2. Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi 832000, Xinjiang, China
  • Received:2022-07-12 Revised:2022-09-06 Online:2023-01-15 Published:2023-02-24

Abstract:

Crop evapotranspiration is the main way of water consumption in the process of farmland water cycle in arid region. It plays an important role in the study of the law of water consumption and formulating scientific irrigation systems under climate change in arid regions. A large-scale weighing lysimeter was used to monitor evapotranspiration of drip irrigation cotton field for 3 consecutive years. Drip irrigation under mulch film and no mulch film were compared to analyze the influence of film mulching and meteorological factors on evapotranspiration. Results showed that (1) in the whole growth period of cotton, the average evapotranspiration of drip irrigation cotton field under mulch film and under no mulch film were 292.15 and 429.22 mm, respectively. The method of drip irrigation under mulch film can reduce evapotranspiration by 31.95%. (2) The relationship between evapotranspiration and evapotranspiration intensity in different growth stages was as follows: blooming and boll stage > budding stage > boll opening stage > seedling stage. (3) The drip irrigation cotton field condenses from 00:00 to 08:00 and evaporated and transpired from 08:00 to 23:00. The evapotranspiration reached the maximum in the afternoon. The maximum appeared at the earliest stage in seedling stage, and at the latest in blooming and boll stage. (4) Evapotranspiration is positively correlated with wind speed, radiation, and temperature and negatively correlated with humidity and air pressure. (5) Rainfall can promote evapotranspiration in cotton fields under drip irrigation. Overall, drip irrigation under mulch film can effectively reduce the evaporation and improve the water use efficiency in the process of agricultural production.

Key words: evapotranspiration, cotton field under drip irrigation, lysimeter, arid region