| Dependence of Wheat and Rice Respiration on Tissue Nitrogen and the Corresponding Net Carbon Fixation Efficiency Under Different Rates of Nitrogen Application |
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| 作者姓名： | 孙文娟 黄耀 陈书涛 邹建文 郑循华 |
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| 作者单位： | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,
Institute of Atmospheric Physics，Chinese Academy of Sciences, Beijing 100029;,College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095,College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,
Institute of Atmospheric Physics，Chinese Academy of Sciences, Beijing 100029 |
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| 基金项目： | 中国科学院知识创新工程项目，国家自然科学基金 |
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| 摘 要： | To quantitatively address the role of tissue N in crop respiration under various agricultural practices, and to consequently evaluate the impact of synthetic fertilizer N application on biomass production and respiration, and hence net carbon fixation efficiency （Encf）, pot and field experiments were carried out for an annual rotation of a rice-wheat cropping system from 2001 to 2003. The treatments of the pot experiments included fertilizer N application, sowing date and planting density. Different rates of N application were tested in the field experiments. Static opaque chambers were used for sampling the gas. The respiration as CO2 emission was detected by a gas chromatograph. A successive biomass clipping method was employed to determine the crop autotrophic respiration coefficient （Ra）. Results from the pot experiments revealed a linear relationship between Ra and tissue N content as Ra = 4.74N-1.45 （R^2= 0.85, P 〈 0.001）. Measurements and calculations from the field experiments indicated that fertilizer N application promoted not only biomass production but also increased the respiration of crops. A further investigation showed that the increase of carbon loss in terms of respiration owing to fertilizer N application exceeded that of net carbon gain in terms of aboveground biomass when fertilizer N was applied over a certain rate. Consequently, the Encf declined as the N application rate increased.
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| 关 键 词： | 水稻 小麦 作物 氮肥施用量 碳固定效率 组织氮 植物自养呼吸 |
| 收稿时间： | 2006-01-19 |
| 修稿时间： | 2006-05-15 |
Dependence of wheat and rice respiration on tissue nitrogen and the corresponding net carbon fixation efficiency under different rates of nitrogen application |
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| Sun?Wenjuan,Huang?Yao,Chen?Shutao,Zou?Jianwen,Zheng?Xunhua.Dependence of Wheat and Rice Respiration on Tissue Nitrogen and the Corresponding Net Carbon Fixation Efficiency Under Different Rates of Nitrogen Application[J].Advances in Atmospheric Sciences,2007,24(1):55-64. |
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| Authors: | Sun Wenjuan Huang Yao Chen Shutao Zou Jianwen Zheng Xunhua |
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| Institution: | (1) College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China;(2) State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China |
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| Abstract: | To quantitatively address the role of tissue N in crop respiration under various agricultural practices,and to consequently evaluate the impact of synthetic fertilizer N application on biomass production and respiration, and hence net carbon fixation efficiency (Encf), pot and field experiments were carried out for an annual rotation of a rice-wheat cropping system from 2001 to 2003. The treatments of the pot experiments included fertilizer N application, sowing date and planting density. Different rates of N application were tested in the field experiments. Static opaque chambers were used for sampling the gas. The respiration as CO2 emission was detected by a gas chromatograph. A successive biomass clipping method was employed to determine the crop autotrophic respiration coefficient (Ra). Results from the pot experiments revealed a linear relationship between Ra and tissue N content as Ra = 4.74N-1.45 (R2= 0.85, P<0.001). Measurements and calculations from the field experiments indicated that fertilizer N application promoted not only biomass production but also increased the respiration of crops. A further investigation showed that the increase of carbon loss in terms of respiration owing to fertilizer N application exceeded that of net carbon gain in terms of aboveground biomass when fertilizer N was applied over a certain rate. Consequently, the Encf declined as the N application rate increased. |
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| Keywords: | crop nitrogen application net carbon fixation efficiency tissue N respiration |
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