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Long-term effects of ozone on CO_2 exchange in peatland microcosms

机译:臭氧对泥炭地微观世界中CO_2交换的长期影响

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摘要

Effects of elevated tropospheric ozone concentration on the CO_2 exchange of peatland microcosms and the photosynthetic capacity of the dominating sedge, Eriophorum vaginatum, were studied in a four-year open-field experiment. The net ecosystem CO_2 exchange and the dark respiration rate of the microcosms were measured with the closed chamber method. The CO_2 assimilation rate and chlorophyll fluorescence (maximal photochemical efficiency of PSII, Fv/Fm) of E. vaginatum leaves were also measured. The gross photosynthesis rate of the microcosms was transiently decreased by ozone exposure during the first year. During the fourth year, the gross photosynthesis and dark respiration rate were both slightly increased by ozone exposure but this was due to the increased density of sedge leaves and no difference was found in Fv/Fm. In overall, chronic ozone exposure had only slight effect on the CO2 exchange of the peatland microcosms.
机译:在一个为期四年的野外试验中,研究了对流层臭氧浓度升高对泥炭地微观世界的CO_2交换和主要莎草vagina的光合能力的影响。用密闭室法测量了生态系统的净CO_2交换量和微观呼吸的暗呼吸速率。还测量了阴道大肠杆菌的CO_2同化率和叶绿素荧光(PSII的最大光化学效率,Fv / Fm)。在第一年中,暴露于臭氧使微观世界的总光合作用速率暂时降低。在第四年中,臭氧暴露使总的光合作用和暗呼吸速率均略有增加,但这是由于莎草叶子的密度增加而导致的,Fv / Fm没有差异。总体而言,长期暴露于臭氧对泥炭地微观世界的CO2交换影响很小。

著录项

  • 来源
    《Atmospheric environment》 |2011年第24期|p.4002-4007|共6页
  • 作者单位

    Department of Biology, University of Eastern Finland, Joensuu Campus, PO Box 111, FI-80101 Joensuu, Finland;

    Department of Environmental Science, University of Eastern Finland, Kuopio Campus, PO Box 1627, FI-70211 Kuopio, Finland;

    Terrestrial Ecology Section, Department of Biology, University of Copenhagen, 0ster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark;

    Department of Biology, University of Eastern Finland, Joensuu Campus, PO Box 111, FI-80101 Joensuu, Finland;

    Department of Environmental Science, University of Eastern Finland, Kuopio Campus, PO Box 1627, FI-70211 Kuopio, Finland;

    Department of Environmental Science, University of Eastern Finland, Kuopio Campus, PO Box 1627, FI-70211 Kuopio, Finland;

    Department of Biology, University of Eastern Finland, Joensuu Campus, PO Box 111, FI-80101 Joensuu, Finland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    peatland; ozone; co_2 exchange; photosynthesis; eriophorum vaginatum;

    机译:泥炭地;臭氧;CO_2交换;光合作用;阴道紫草;

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