Xie Zubin, Zhu Jianguo, Zhang Yali, Ma Hongliang, Liu Gang, Han Yong, Zeng Qing, Cai Zucong
Key Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008.
Ying Yong Sheng Tai Xue Bao. 2002 Oct;13(10):1223-30.
FACE (Free-air Carbon Dioxide Enrichment) was used to study the effects of elevated CO2 on rice (Oryza sativa) growth, tissue C/N, N and P concentration and uptake at different development stages under two N and two P levels. Results showed that elevated CO2 increased dry matter accumulation in rice stem, ear and root. Leaf dry matter was increased at tillering stage and no significant effect was found at jointing, heading and ripening stages. N concentration of stem and leaf was decreased. Ear N concentration at heading stage was increased but was decreased at ripening stage. No significant effect was found on root N concentration at tillering stage but root N concentration at jointing, heading and ripening was decreased. Leaf P concentration at jointing, heading and ripening was increased but no significant effect was found on P concentration in stem, ear and root. C content in various tissues changed unremarkably and the ratio of C over N (C/N) was increased. Elevated CO2 significantly increased P uptake in aboveground tissues; and increased N uptake, but the difference was not statistically significant. N and P fertilization had no significant effect on various tissue dry biomass. Tissue N content at higher N fertilization was higher than at lower N fertilization but no such effect of P fertilization on tissue P content was found. At higher N fertilization, elevated CO2 increased the ratio of below-ground biomass over above-ground biomass at ripening stage. Possible reasons are discussed for the differences of tissue N and P content and the ratio of below-ground biomass over above-ground biomass between elevated and ambient atmospheric CO2 concentrations.
利用自由空气二氧化碳浓度增高（FACE）技术，在两种氮素和两种磷素水平下，研究了不同发育阶段二氧化碳浓度升高对水稻（Oryza sativa）生长、组织碳氮比、氮和磷浓度及吸收的影响。结果表明，二氧化碳浓度升高增加了水稻茎、穗和根的干物质积累。分蘖期叶片干物质增加，拔节期、抽穗期和成熟期未发现显著影响。茎和叶的氮浓度降低。抽穗期穗部氮浓度增加，但成熟期降低。分蘖期根系氮浓度未发现显著影响，但拔节期、抽穗期和成熟期根系氮浓度降低。拔节期、抽穗期和成熟期叶片磷浓度增加，但茎、穗和根的磷浓度未发现显著影响。各组织中的碳含量变化不显著，碳氮比（C/N）增加。二氧化碳浓度升高显著增加了地上部组织的磷吸收；增加了氮吸收，但差异无统计学意义。氮和磷施肥对各组织干生物量无显著影响。高氮施肥时组织氮含量高于低氮施肥，但未发现磷施肥对组织磷含量有此影响。在高氮施肥条件下，二氧化碳浓度升高增加了成熟期地下生物量与地上生物量的比值。文中讨论了二氧化碳浓度升高与环境大气二氧化碳浓度下组织氮和磷含量以及地下生物量与地上生物量比值差异的可能原因。
