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Effect of Nitrogen Supply on Carbon Dioxide–Induced Changes in Competition between Rice and Barnyardgrass (Echinochloa crus-galli)

Published online by Cambridge University Press:  20 January 2017

Chunwu Zhu ,
Qing Zeng ,
Lewis H. Ziska ,
Jianguo Zhu ,
Zubing Xie  and
Gang Liu
Chunwu Zhu
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
Qing Zeng
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
Lewis H. Ziska
Affiliation:
USDA-ARS, Crop Systems and Global Change Laboratory, Beltsville, MD 20705
Jianguo Zhu*
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
Zubing Xie
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
Gang Liu
Affiliation:
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, PR China
*
Corresponding author's E-mail: [email protected]
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Abstract

As atmospheric carbon dioxide concentration ([CO2]) increases, it is anticipated that the competitive ability of C3 crops could be enhanced relative to C4 weeds in agricultural systems. However, given the different nitrogen use efficiencies of C3 and C4 plants, it is unclear whether any effect of increasing [CO2] on C3/C4 competition is nitrogen dependent. To determine the interaction of [CO2] and N availability on species growth and competitive outcomes, the growth of rice (C3 photosynthetic pathway) was examined in both monoculture and in competition with a common weed, barnyardgrass (C4 photosynthetic pathway) at two levels of N supply (0.357 and 1.071 mmol N L−1) and two levels of [CO2] (ambient and ambient + 200 µmol mol−1) under field conditions in eastern China. In monoculture, the biomass response of rice to elevated [CO2] depended on N supply, whereas the response of barnyardgrass to elevated [CO2] was less dependent on nitrogen. Consequently, when grown in mixture, the proportion of rice biomass increased relative to that of barnyardgrass under elevated [CO2] if the supply of nitrogen was adequate. However, if N was low, elevated [CO2] significantly reduced the proportion of leaf area and root biomass relative to barnyardgrass biomass. Although data from this experiment confirm that competitiveness of rice could be enhanced relative to C4 weeds in response to rising [CO2] in situ, the data also indicate that such a response could be contingent on the supply of nitrogen. This suggests that, for rice cropping systems where N is in limited supply, rising atmospheric CO2 could still exacerbate competitive losses, even from C4 weeds.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGrice, Oryza sativa L. ‘Japonica 9915’.Carbon dioxidecompetitionnitrogen stress
Type
Weed Biology and Ecology
Information
Weed Science , Volume 56 , Issue 1 , February 2008 , pp. 66 - 71
Copyright
Copyright © Weed Science Society of America 

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