Optimizing water-use efficiency under elevated CO2: A meta-analysis of crop type, soil modulation, and enrichment methods

被引:0
|
作者
Mokhtar, Ali [1 ,2 ]
He, Hongming [1 ]
Attaher, Samar [3 ]
Salem, Ali [4 ,5 ]
Alam, Muneer [1 ]
机构
[1] East China Normal Univ, Sch Geog Sci, Shanghai 209962, Peoples R China
[2] Cairo Univ, Fac Agr, Dept Agr Engn, Giza 12613, Egypt
[3] Int Ctr Agr Res Dry Areas ICARDA, Maadi, Egypt
[4] Minia Univ, Fac Engn, Civil Engn Dept, Al Minya 61111, Egypt
[5] Univ Pecs, Fac Engn & Informat Technol, Struct Diagnost & Anal Res Grp, Boszorkany Ut 2, H-7624 Pecs, Hungary
基金
中国国家自然科学基金;
关键词
Elevated CO2; Photosynthetic rate; Stomatal conductance; Water use efficiency; Yield; Meta-analysis; Random effect model; ATMOSPHERIC CO2; DEFICIT IRRIGATION; CARBON-DIOXIDE; TOMATO PLANTS; WHEAT; GROWTH; YIELD; DROUGHT; COTTON; PRODUCTIVITY;
D O I
10.1016/j.agwat.2025.109312
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Elevated CO2 (eCO2) significantly affect the carbon-water cycle in terrestrial ecosystems especially for gas exchange and water use efficiency (WUE). Therefore, in this study, we have conducted a meta-analysis to quantitative statistical means among studies and discuss how WUE responds to eCO2 under pathway (C3 and C4), four enrichment methods and soil types based on 124 peer-reviewed studies and 1474 observations to provide an indepth overview of how these factors interact under future CO2 scenarios. Key findings reveal that: (1) C3 crops, such as potato and tomato, show significantly greater increases in WUE compared to C4 crops like maize, with effect sizes of 13.96 and 7.02 for plant-level WUE (WUEp), suggesting that C3 crops may be more advantageous in water-limited environments due to reduced photorespiration under eCO2; (2) soil type substantially modulates WUE responses, with clay soils, due to their high water-holding capacity, demonstrating the highest WUE enhancements (effect sizes of 7.87 for WUEp and 12.54 for yield WUE, WUE gamma), while sandy soils, characterized by rapid drainage, showed limited improvements; and (3) greenhouse and growth chamber studies displayed the highest WUE improvements, while FACE experiments, which better replicate real-world conditions, indicated smaller WUE increases due to environmental variability, underscoring the need for a hybrid approach that merges controlled data with field insights to develop practical, water-efficient agricultural strategies. Collectively, these findings highlight the potential for crop- and soil-specific strategies to optimize WUE under elevated CO2, offering valuable insights for sustainable agriculture and climate adaptation.
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页数:13
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