期刊
AGRICULTURAL WATER MANAGEMENT
卷 67, 期 3, 页码 221-233出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.agwat.2004.01.005
关键词
CO2 enrichment; evapotranspiration; leaf area; nitrogen nutrition; soil water stress; stomatal conductance
Atmospheric CO2 enrichment may bring different effects on plant growth and evapotranspiration if plants are under N and water deficient conditions. In this study, spring wheat (Triticum aestivum L.) was grown in pots at two atmospheric CO2 concentrations (ambient and elevated), two levels of soil moisture (well-watered and droughted to 45-60% of field capacity) and five nitrogen (N) fertilization treatments (0, 112.5, 225.0, 337.5, 450.0 kg hm(-2)) in growth chambers. Leaf growth, leaf area, and tiller increment were largely a function of N application and water supply. Elevated CO2 increased 23-45% in leaf area only with the N-added treatments 55 days after sowing. Elevated CO2 also reduced stomatal conductance more in droughted treatments (-51%) than in well-watered treatments (-41%), and more with zero N application (-60%) than with the adequate N (-35 to 44%). Evapotranspiration (ET) was also reduced by CO, enrichment in a similar way. Our results showed that the CO2-enrichment-induced decrease in transpiration almost compensated for the increase in ET brought by the higher leaf area under adequate N and water Supply, such that ET was similar for control and CO2-enriched plants. Under reduced N and water supply, CO2 enrichment had limited effect on either leaf growth or ET. (C) 2004 Elsevier B.V. All rights reserved.
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