TY - JOUR
T1 - Interactive effects of elevated CO2, nitrogen and drought on leaf area, stomatal conductance, and evapotranspiration of wheat
AU - Li, Fusheng
AU - Kang, Shaozhong
AU - ZHANG, Jianhua
N1 - Funding Information:
We are grateful to the support by Chinese National Science Fund (50339030 and 50279043) and the National Project No. 2002AA6Z-3031, Guangxi University Science Fund, China (No. DD160002) and the RGC of Hong Kong University Grants Council (HKBU 2041/01M). And we also would like to thank the staffs of the Key Laboratory of Agricultural Soil and Water Engineering in the Arid and Semiarid Areas, Ministry of Education, PR China.
PY - 2004/7/1
Y1 - 2004/7/1
N2 - 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 CO2 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.
AB - 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 CO2 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.
KW - CO enrichment
KW - Evapotranspiration
KW - Leaf area
KW - Nitrogen nutrition
KW - Soil water stress
KW - Stomatal conductance
UR - http://www.scopus.com/inward/record.url?scp=2642518251&partnerID=8YFLogxK
U2 - 10.1016/j.agwat.2004.01.005
DO - 10.1016/j.agwat.2004.01.005
M3 - Journal article
AN - SCOPUS:2642518251
SN - 0378-3774
VL - 67
SP - 221
EP - 233
JO - Agricultural Water Management
JF - Agricultural Water Management
IS - 3
ER -