中国水稻科学

中国水稻科学

• 研究报告 • 上一篇    下一篇

CO2浓度升高条件下水稻蒸腾与N吸收的关系

庞静1，2,*;朱建国1;谢祖彬1 ;刘刚1;陈改苹1   

  1. 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； 2湖北大学 资源与环境学院， 湖北 武汉 430062
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-03-10 发布日期:2006-03-10

Relations Between Transpiration and N Uptake of Rice Grown in Elevated Air Carbon Dioxide Concentration

PANG Jing , ZHU Jian-guo , XIE Zu-bin , LIU Gang , CHEN Gai-ping   

  • Received:1900-01-01 Revised:1900-01-01 Online:2006-03-10 Published:2006-03-10

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摘要： 利用FACE（Free Air CarbonDioxide Enrichment）平台技术，用水培试验研究了低氮（14 mg/L）和高氮（28 mg/L）水平下，大气CO2浓度升高条件下水稻蒸腾与N吸收速率的相关关系。结果表明，在CO2浓度升高条件下，水稻生物量增加了36%（低N）和29%（高N）；总吸N量也增加达7%（低N） 和5%（高N）；而总蒸腾量减少28%（低N）和10%（高N）。由于促进更多分蘖的发生，高CO2浓度使分蘖期水稻平均N吸收速率提高了31%～156%（低N）和19%～87%（高N），在其他时期无明显影响；而高CO2浓度对水稻平均蒸腾速率的影响主要表现在抽穗到灌浆末期。在对照条件下，平均蒸腾速率和平均N吸收速率呈显著正相关；但在CO2浓度升高条件下，两者相关关系不显著。说明人们所推测的“蒸腾效应”——高CO2浓度条件下降低了的蒸腾作用并非影响水稻N吸收的关键因素。

关键词: 相关关系, 蒸腾速率, 氮吸收速率, 二氧化碳浓度升高, 水稻

Abstract: Correlation between transpiration and N uptake rate of rice at low N (LN, 14 mg/L) and high N (HN, 28 mg/L) in solution culture was studied under ambient air and elevated atmospheric p CO2 (Ambient+200 μmol/mol) by the China FACE (Free-Air CO2 Enrichment). Elevated p CO2 increased rice biomass and total N uptake significantly by 36% and 7% at LN, 29% and 5% at HN, respectively, while decreased total amount of transpiration by 28% at LN and 10% at HN. Elevated p CO2 stimulated average N uptake rate at the tillering stage as the result of enhanced occurrence of tillers. However, the significant effect of elevated p CO2 on average transpiration rate was only observed from the panicle initiation to late filling stage. The positive correlation between transpiration rate and N uptake rate was significant at Ambient but not elevated p CO2, indicating that declined transpiration caused by CO2 enrichment may not be the key factor affecting N uptake.

Key words: correlation, transpiration rate, nitrogen uptake rate, elevated air carbon dioxide concentration, rice