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| DOI：10.13522/j.cnki.ggps.2019049 |
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| Meta-analysis on influencing factors of irrigated winter wheat yield and water use efficiency in China |
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WU Yamei , ZHU Jintin, ZHU Delan, LI Dan
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1.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling 712100, China; 2.College of Water Resources and Architectural Engineering, Northwest A& F University,Yangling 712100, China; 3.Qinghai Research Institute of Water Conservancy & Hydro-electric Power, Xining 810001, China
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| Abstract: |
| 【Objective】At present, most of the studies on the factors affecting the yield and water use efficiency of irrigated winter wheat are concentrated on a particular area, and the study are scattered. Considering these, this paper reveals the influencing factors of yield and water use efficiency of irrigated winter wheat at macro scale.【Method】Based on the published data of field experiments, we obtained the effects of irrigation on yield and water use in different areas by using Meta-analysis method. On the basis of heterogeneity test, the effects of irrigation quota, rainfall and average temperature on winter wheat yield and water use efficiency were investigated by meta subgroup analysis.【Result】Compared with non-irrigated winter wheat during the growth period, irrigation increased winter wheat yield by 39.34% and water use efficiency by 3.39%. The yield increased with the irrigation quota, and the increase tended to stabilize gradually, while the effect of water use efficiency increased first and then decreased with the irrigation quota. When the irrigation quota was increased to＞240 mm, the change rate of relative water use efficiency (WUE) of winter wheat decreased by 11.29%. With the increase of average temperature during the growth period, the yield-increasing effect of irrigated winter wheat was significant. The yield of winter wheat increased by 45.81% when the average temperature of the growing period was higher than 9 ℃. The rainfall in the growth period had a significant effect on the yield of irrigated winter wheat, and the effect of irrigation yield was the most prominent when the rainfall type in the growth period was dry year with yield increase rate of 72.48%. 【Conclusion】The irrigation quota of 60～120 mm is more favorable to increase yield and water use efficiency of winter wheat. The study results can be used as reference for timely and appropriate field irrigation for different rainfall years. |
| Key words: winter wheat; yield; water use efficiency; Meta-analysis; irrigation quota; meteorological factor |
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