Chinese Journal OF Rice Science

Chinese Journal of Rice Science

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Effects of Free-Air Carbon Dioxide Enrichment(FACE) on Some Traits and C/N Ratio of Rice Root at the Heading Stage

CHEN Gai-ping , ZHU Jian-guo , PANG Jing , CHENG Lei , XIE Zu-bin , ZENG Qing   

  • Received:1900-01-01 Revised:1900-01-01 Online:2006-01-10 Published:2006-01-10

CO2浓度升高对水稻抽穗期根系有关性状及根碳氮比的影响

陈改苹;朱建国*;庞静;程磊;谢祖彬;曾青   

  1. 中国科学院 南京土壤研究所 土壤与农业可持续发展国家重点实验室， 江苏 南京 210008；*通讯联系人， E-mail:jgzhu@issas.ac.cn

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Abstract: Rice root growth was examined by using hydroponics in a FACE(free-air carbon dioxide enrichment)study. Root biomass, root volume, ratio of root/shoot, number of adventitious roots and root diameter were all increased significantly under FACE conditions. CO 2 enrichment decreased the N content in the rice root, but did not change the C content, leading to an obvious increase in the ratio of C/N. Elevated CO 2 decreased the rice root activity remarkably. Decrement in nutrient uptake efficiency may be the mechanism of decreased N content in root.

Key words: free-air CO2 enrichment, rice, C/N ratio of root, root activity

摘要： 在FACE (freeair carbon dioxide enrichment) 实验平台上,采用水培的方法观测了抽穗期水稻根系的生长情况。结果表明,FACE条件下根生物量、根体积和根冠比极显著增加且不定根明显增多、变粗。高CO2浓度显著降低了根中N含量,而C含量变化不明显,导致碳氮比极显著增加。基于单位根质量的根系活力在CO2浓度增加条件下极显著降低,养分吸收效率的降低可能是根中N含量下降的重要原因。

关键词: CO2浓度增加, 水稻, 根碳氮比, 根系活力