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cje ›› 2004, Vol. ›› Issue (5): 67-70.

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Effects of FACE (free-air carbon dioxide enrichment) on nitrifiers and denitrifiers in wheat field soil

YUE Jin1, SHI Yi1, HUANG Guohong1, LI Yang1, ZHU Jianguo2   

  1. 1. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
  • Received:2004-03-30 Revised:2004-05-21 Online:2004-10-10

Abstract: Elevated atmospheric CO2 concentrations may alter nitrifiers and denitrifiers which are related to soil Nturnover.Afree-air CO2 enrichment (FACE) experiment was conducted to evaluate changes in the rice-wheat rotation ecosystem under enriched CO2 conditions from 2001 at Wuxi,China.We measured numbers of nitrifiers and denitrifers from FACE wheat fields and wheat fields with ambient levels of CO2 during the 2003 wheat-growing seasons.Nitrifiers and denitrifiers populations were estimated by the most probable number (MPN) method.The results showed that raised atmospheric CO2 concentrations decreased nitrifiers numbers in the upper soil layer at jointing and ripening stages,whereas at booting stage, nitrifiers number from FAC Eplots was higher than that from ambient plots.Nitrifiers populations from FACE plots were lower than that from ambient plots at wintering and ripening stages in the lower soil layer.Increased CO2 has negative influence on nitrifiers number.There is no significant difference between denitrifiers numbers from FACE plots and ambient plots in the upper soil layer.At jointing stage denitrifiers numbers from FACE plots were lower than that from ambient plots in the lower soil layer.Denitrifiers are not sensitive to changes that altered by elevated CO2.

Key words: Conyza canadensis, Tolerance, Heavy metal

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