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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (10): 1223-1230.

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XIE Zubin, ZHU Jianguo, ZHANG Yali, MA Hongliang, LIU Gang, HAN Yong, ZENG Qing and CAI Zucong   

  1. Key Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
  • Received:2002-06-28 Revised:2002-08-03 Online:2002-10-15

Abstract: FACE (Free-air Carbon Dioxide Enrichment) was used to study the effects of elevated CO2 on rice (Oryza sativa) growth,tissue C/N,Nand Pconcentration and uptake at different development stages under two Nand two Plevels. 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. Nconcentration of stem and leaf was decreased. Ear Nconcentration at heading stage was increased but was decreased at ripening stage. No significant effect was found on root Nconcentration at tillering stage but root Nconcentration at jointing, heading and ripening was decreased. Leaf Pconcentration at jointing, heading and ripening was increased but no significant effect was found on Pconcentration in stem, ear and root. Ccontent in various tissues changed unremarkably and the ratio of Cover N (C/N) was increased. Elevated CO2 significantly increased Puptake in aboveground tissues; and increased Nuptake, but the difference was not statistically significant. Nand Pfertilization had no significant effect on various tissue dry biomass. Tissue Ncontent at higher Nfertilization was higher than at lower Nfertilization but no such effect of Pfertilization on tissue Pcontent was found. At higher Nfertilization, 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 Nand Pcontent and the ratio of below-ground biomass over above-ground biomass between elevated and ambient atmospheric CO2 concentrations.

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