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生态学杂志 ›› 2004, Vol. ›› Issue (5): 67-70.

• 研究报告 • 上一篇    下一篇

大气CO2浓度增高对麦田土壤硝化和反硝化细菌的影响

岳进1, 史奕1, 黄国宏1, 李杨1, 朱建国2   

  1. 1. 中国科学院沈阳应用生态研究所陆地生态过程重点实验室, 沈阳, 110016;
    2. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京, 210008
  • 收稿日期:2004-03-30 修回日期:2004-05-21 出版日期:2004-10-10
  • 通讯作者: 岳进,1975年生,女,硕士,研究实习员.主要从事农田生态系统生物源温室气体排放及相关微生物过程研究,发表论文9篇.
  • 基金资助:
    国家自然科学基金资助项目(40271111);国家自然科学基金重大国际合作研究项目(40120140817);中国科学院知识创新重要方向资助项目(KZCX2-408)

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

摘要: 硝化和反硝化细菌是土壤中与氮转化有关的微生物菌群,大气CO2浓度升高可能对它们的数量产生影响。位于中国无锡的稻麦轮作农田生态系统FACE平台2001年6月开始运行。本试验在2003年小麦生长季研究了土壤(0~5cm和5~10cm土层)中硝化和反硝化细菌在大气CO2浓度升高条件下的变化。试验采用最大可能法(MPN)计这两种微生物菌群的数量。结果表明,0~5cm土层硝化菌数拔节期和成熟期FACE低于对照,而孕穗期FACE高于对照,5~10cm土层硝化菌数越冬期与成熟期FACE低于对照,大气CO2浓度升高使得麦田土壤硝化细菌数目减少。0~5cm土层各个生长期反硝化菌数FACE与对照均没有明显差异,5~10cm土层反硝化菌数拔节期FACE低于对照,大气CO2浓度升高对麦田土壤反硝化菌的影响不大。

关键词: 小飞蓬, 耐受性, 重金属

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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