HUBEI AGRICULTURAL SCIENCES ›› 2024, Vol. 63 ›› Issue (7): 13-20.doi: 10.14088/j.cnki.issn0439-8114.2024.07.003

• Resource & Environment • Previous Articles     Next Articles

Impacts of elevated CO2 concentration on water use efficiency in cropland ecosystems:A meta-analysis of climate chamber controlled experiments

ZHU Jin-ruia, ZOU Jing-rua,b, ZHAO Guo-qinga   

  1. a. College of Minsheng; b. College of Geography and Environmental Science, Henan University, Kaifeng 475000,Henan, China
  • Received:2023-06-05 Online:2024-07-25 Published:2024-07-24

Abstract: 21 articles related to climate chamber controlled experiments from 1985 to 2020 were selected to study the effects of elevated CO2 concentration on water use efficiency(WUE)of the farmland ecosystem by the meta-analysis method. The results showed that under the control of the climate chamber, the increase of CO2 concentration had a positive impact on water use efficiency (WUE) with an increase ratio of 20%. Furthermore, it had positive and negative effects on carbon accumulation and evapotranspiration with the effects of 34% and -4%, respectively. However, all the responses had significant heterogeneity (P<0.05). The results also found that the effect of elevated CO2 concentration on WUE was significantly positively correlated with the effect on carbon accumulation (P<0.05), but not significantly correlated with the effect on evapotranspiration (P>0.05). The heterogeneity analysis results indicated that the effect of elevated CO2 concentration on WUE was significantly different among various crops, and the effect on soybean and tomato was significantly higher than that on wheat (P<0.05). Moreover, the effect of elevated CO2 concentration on WUE was significantly correlated with light intensity, temperature and soil relative water content (P<0.05), among which, there was a negative correlation with light intensity, a positive correlation with temperature and soil water content, but no significant correlation with CO2 enrichment.

Key words: elevated CO2 concentration, cropland ecosystems, water use efficiency, meta-analysis, climate chamber, environmental factors

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