| Effects of Free-air CO2 Enrichment on Root Characteristics and C：N Ratio of Rice at the Heading Stage |
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| 作者姓名： | CHEN Gai-ping CHENG Lei ZHU Jian-guo PANG Jing XIE Zu-bin ZENG Qing |
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| 作者单位： | State Key Laboratory of Soil and Sustainable Agriculture，Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China |
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| 基金项目： | 国家自然科学基金;中国科学院"百人计划";国家重点基础研究发展计划(973计划) |
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| 摘 要： | The CO2 concentration in Earth’s atmosphere is increasing rapidly due to human activities, like fossil fuel combustion and rapid deforestation and is predicted to reach a concentration of 550 μmol/mol within this century 1]. The increase in atmospheric CO2 has a large potential to alter many ecosystem processes, particularly C and N cycling 2-4]. Plant C:N ratio not only serves as an important factor in maintaining the quality of plant tissue, but also a key index to keep balance betwee…
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| 关 键 词： | 水稻 根系活力 碳 氮 |
| 收稿时间： | 2006-01-09 |
| 修稿时间： | 2006-03-22 |
Effects of Free-air CO2 Enrichment on Root Characteristics and C:N Ratio of Rice at the Heading Stage |
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| CHEN Gai-ping CHENG Lei ZHU Jian-guo PANG Jing XIE Zu-bin ZENG Qing.Effects of Free-air CO2 Enrichment on Root Characteristics and C:N Ratio of Rice at the Heading Stage[J].Rice science,2006,13(2):120-124. |
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| Authors: | CHEN Gai-ping CHENG Lei ZHU Jian-guo PANG Jing XIE Zu-bin ZENG Qing |
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| Institution: | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | A hydroponics experiment was conducted to investigate the rice root growth in FACE (free-air carbon dioxide enrichment). The root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter significantly increased under FACE conditions, while the CO2 enrichment decreased the N concentration in rice roots without any change in the C content, leading to an increase in root C:N ratio. Moreover, the elevated CO2 resulted in a remarkable decrease of root activity, expressed as per unit root dry weight, which might be responsible for decreased N concentration in roots. |
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| Keywords: | free-air CO2 enrichment (FACE) rice root C:N ratio root activity |
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