中文摘要：

在水稻品种中，杂交籼稻因其杂种优势强、抗逆性好、穗型大、产量潜力高，在稻作中占有重要的、不可替代的作用。2005、2006年利用我国惟一的农田开放式空气CO2浓度增高（FACE）研究平台，设计施N量为125kg·hm^-2（LN）、250kg·hm^-2（NN）处理，研究大气CO2浓度比对照高200μmol·mol^-1的FACE处理对三系杂交籼稻汕优63不同生育时期磷素含量、磷素吸收、磷素分配和磷素效率的影响。结果表明：（1）FACE处理使汕优63各生育时期稻株含P率极显著提高，使各生育时期P素吸收量极显著增加，生育中期的增幅略小于生育前、后期；（2）FACE处理使汕优63抽穗后P素在茎鞘中的分配比例显著增加，穗中的分配比例显著下降，对抽穗前P素在叶片、茎鞘中的分配比例均无显著影响；（3）FACE处理使汕优63不同生育期P素干物质生产效率极显著下降，使P素子粒生产效率和P素收获指数亦均极显著下降；（4）增施N肥，使汕优63大多数生育时期的植株P素含量和吸P量得到显著或极显著的增加，使大多数生育时期P素干物质生产效率下降，使P素子粒生产效率和收获指数显著下降；（5）CO2×N、CO2×Y对植株含P率、吸P量的影响有互作效应，FACE处理使汕优63稻株含P率、P素吸收量显著提高；使P素干物质生产效率、P素子粒效率显著下降。

英文摘要：

Hybrid indica rice（ Oryza s ativa L. ）cultivars play an important and irreplaceable role in rice production system due to its heterosis, resistance to environmental stress, large panicle and high yield potential. In this study, the Chinese unique Free Air CO2 Enrichment [FACE, 200 μmol·mol^-1 higher than ambient （AMB） ] research platform was used to investigate the effecis of FACE on rice phosphorus （P） concentration, uptake, efficiency and allocation at different growth stages of three-line indica hybrid rice cultivar Shanyou 63 under two levels of N： low （LN, 125 kg·hm^-2） and normal N （NN, 250 kg·hm^-2） in 2005--2006. Main results showed that： （ 1 ）Compared with AMB, FACE significantly increased P concentration in rice plant of Shanyou 63 over the season, FACE significantly increased phosphorus accumulation in rice plant, and the increasing rate at the middle growth stage was less than that at the early and late growth stage. （2）Before heading, FACE had no obvious effect on phosphorus allocation pattern of Shanyou 63, but after heading, it made the proportion of phosphorus allocation in leaves significant increased, the phosphorus allocation in spikes significant decreased. （3）Under FACE treatment, P use efficiency for biomass （PUEp） over the season, P use efficiency for grain yield（PUEg）at grain maturity, and phosphorus harvest index （PHI） were significantly decreased. （4）Phosphorus concentration and accumulation at majority growth stages of Shanyou 63 increased with increasing N supply （P〈 0.05 or 0.01 ）, but PUEp and PUEg showed the opposite trends. （5 ）Significant interactions between [CO2]xN and [CO2]xyear were observedfor P concentration and accumulation. FACE increased P concentration and P uptake, decreased PUEp and PUEg at different growth stages of Shanyou 63.