Effects of CO2 enrichment, nitrogen and water on photosynthesis, evapotranspiration and water use efficiency of spring wheat

Abstract

Abstract: Spring wheat (Triticum aestivum L.) was treated with 2 atmospheric CO₂ concentrations (350 and 700 μmol·mol^-1), 2 levels of soil moisture (wet and drought), and 5 levels of nitrogen fertilizer (0,50,100,150,200 mg·kg^-1 soil). The results showed that elevated atmospheric CO₂ increased photosynthetic rate more in drought than in wet treatment. Photosynthetic rate increased with the increase of nitrogen fertilizer. Stomatal conductance decreased with CO₂ enrichment, which was more in drought than in wet treatment. CO₂ enrichment decreased more evapotranspiration in drought than in wet treatment. The decrease was more apparent with no fertilization. CO₂ enrichment increased more leaf water use efficiency in drought than in wet treatment. Canopy WUEincreased with CO₂ enrichment and Nfertilization. Thus, the increase in photosynthesis and the reduction in evapotranspiration due to elevated CO₂ can ameliorate the negative effects of drought, and increase wheat resistance to water stress.

Key words: CO₂ concentration enrichment, Soil moisture, Nitrogen fertilizer rates, Evapotranspiration, WUE, growth ring age, climatic factor, radical variation, wood property, Machilus pauhoi

CLC Number:

Q945.11
S158

LI Fusheng, KANG Shaozhong, ZHANG Fucang. Effects of CO₂ enrichment, nitrogen and water on photosynthesis, evapotranspiration and water use efficiency of spring wheat[J]. Chinese Journal of Applied Ecology, 2003, (3): 387-393.

References

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Effects of CO₂ enrichment, nitrogen and water on photosynthesis, evapotranspiration and water use efficiency of spring wheat

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