| This article has been：Browse 226Times Download 26Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2026006 |
|
| A meta-analysis of the factors regulating evapotranspiration in cotton fields under different drip irrigation regimes in Xinjiang |
|
Sun Rui, Gao Tian, Zhang Shuo, Liu Zongxi, Li Fadong, Gong Ping, Yang Guang
|
|
1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832003, China; 2. Key Laboratory of
Cold and Arid Regions Eco-hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi 832003, China;
3. Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production & Construction Corps, Shihezi 832003, China;
4. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
|
| Abstract: |
| 【Objective】Evapotranspiration (ET) is a key determinant of irrigation requirement in agricultural production in arid regions. Under mulched drip irrigation, ET is influenced by climate, soil properties and agronomic management, but how irrigation regime affects ET across different environmental and management conditions remains poorly understood. This study addressed this knowledge gap by systematically analyzing the response of cotton-field ET to irrigation regime and identifying factors that regulate these responses.【Method】A meta-analysis was conducted using sufficient drip irrigation as the control to quantify the changes in cotton-field ET under over-irrigation, mild, moderate, and severe water-stress drip irrigation, and evaluate how climatic conditions, soil properties and agronomic management practices modified these responses.【Result】Compared with sufficient irrigation, mild, moderate, and severe water-stress irrigation significantly reduced cotton-field ET by 9.89%, 19.41%, and 30.89%, respectively, whereas over-irrigation significantly increased ET by 9.01% (P＜0.05). Climatic conditions strongly modulated ET responses to irrigation regimes, with the greatest responses occurring when growing-season precipitation exceeded 150 mm, mean temperature ranged from 21 to 24 ℃, sunshine duration ranged from 1 500 to 2 000 h, and mean wind speed exceeded 2 m/s. Soil texture and agronomic management also modified these responses, with ET in sandy loam soils showing the greatest sensitivity to irrigation regimes. A combination of nitrogen application rate of 300-400 kg/hm2, planting density of 6×104-12×104 plants/hm2, and mulch coverage ≥90% reduced ET by more than 30% under severe water-stress irrigation.【Conclusion】Irrigation regimes substantially regulated ET in mulched drip-irrigated cotton fields in Xinjiang through interactions among climate, soil properties and agronomic management. These findings provide a scientific basis for developing precision irrigation strategies for cotton production in arid regions and improving irrigation water-use efficiency. |
| Key words: irrigation gradient evapotranspiration mulch drip irrigation meta-analysis cotton field |
|
|
