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首页> 外文期刊>oecologia >The influence of water on CO2exchange in the lichenParmelia praesignisNyl.
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The influence of water on CO2exchange in the lichenParmelia praesignisNyl.

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摘要

Net photosynthetic rates for the lichenParmelia praesignisNyl. were obtained as a function of 5 light levels, 5 temperature levels, and of water content as thalli dried from saturated conditions. Data are described as second order polynomials in the light, and as saturation curves in the dark. Rates in the light were depressed at high water contents reaching maximal rates between 110 and 180 water content and declining as thalli dried. Physiological parameters were derived from the drying curves to investigate temperature and light interactions. Dark respiration parameters are the maximal rate, the water content where the rate is half-maximal, the water content at which respiration is zero, and the maximal water efficiency. In the light, parameters are the maximal net photosynthetic rate, the water content at the maximal rate, the water compensation point, the maximal water efficiency, and the sensitivity of net photosynthesis to change in water content.

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  • 来源
    《oecologia》 |1984年第2期|204-210|共页
  • 作者

    S.O.Link; T.H.NashIII;

  • 作者单位

    Arizona State University;

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  • 正文语种 英语
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