Abstract: Nutrient uptake and distribution in different tissues of rice (Oryza sativa L.) and nutrient contents in grain at low N (14 mg/L) and normal N (28 mg/L) were studied under ambient air and elevated atmospheric pCO₂ (Ambient+200 μmol/mol) by the China FACE (Free-Air Carbon-Dioxide Enrichment). Supplied with available forms of nutrients at current normal level, rice uptook more K, Ca, Fe under elevated pCO₂ treatment. N, P, Mg, Mn but not K, Ca, Cu, Zn, Fe distribution in panicle increased due to elevated pCO₂ treatment. P, Ca, Mg, Cu, Zn, Fe, Mn contnets in rice grain remained unaffected while N, K contents declined significantly under elevated pCO₂ treatment. Effect of elevated pCO₂ on the possible “hidden hunger” in rice grain was also discussed.

Key words: elevated pCO2, rice, nutrient uptake and distribution, nutrient contents, grain

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）和常氮（28 mg/L）水平下，大气CO2浓度升高对水稻（Oryza sativa L.）N、P、K、Ca、Mg、Cu、Zn、Fe、Mn的吸收和在植株不同部位的分配，并着重分析了CO2浓度升高对稻米中营养元素含量的影响。结果表明，按照当前CO2浓度条件下营养元素的正常供应水平，而且各元素都以有效态供给时，CO2浓度升高对多数被测元素吸收总量影响不大，只增加了K、Ca、Fe的吸收总量； N、P、Mg、Mn向穗部分配增加，K、Ca、Cu、Zn、Fe向穗部的分配比例不变；水稻籽粒中P、Ca、Mg、Cu、Zn、Fe和Mn含量无显著影响，N、K含量显著下降。还初步探讨了CO2浓度升高对稻米中人类必需营养元素的不足（或“隐性饥饿”）的影响。

关键词: CO2浓度升高, 水稻, 营养元素吸收与分配, 营养元素含量, 籽粒