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首页> 外文期刊>Polar biology >Summer variability, winter dormancy: lichen activity over 3 years at Botany Bay, 77°S latitude, continental Antarctica
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Summer variability, winter dormancy: lichen activity over 3 years at Botany Bay, 77°S latitude, continental Antarctica

机译：夏季多变性，冬季休眠：南极大陆，植物学湾，纬度77°S，历时3年的地衣活动

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摘要

Lichens make up a major component of Antarctic vegetation; they are also poikilohydric and are metabolically active only when hydrated. Logistic constraints have meant that we have little idea of the length, timing or environmental conditions of activity periods of lichens. We present the results of a three-year monitoring of the activity of the lichen Umbilicaria aprina at Botany Bay (77°S latitude) in the Ross Sea region, continental Antarctica. Chlorophyll fluorescence parameters that allowed hydrated metabolic activity to be detected were recorded with a special fluorometer at 2- or 3-h intervals. Air and thallus temperatures and incident PPFD (photo-synthetic photon flux density,μmol photon m~(-2) s~(-1)) were also recorded at hourly intervals. Activity was extremely variable between months and years and, overall, lichen was active for 7% of the 28-month period. Spring snow cover often delayed the onset of activity. Whereas the period immediately after snow melt was often very productive, the later months, January to March, often showed low or no activity. Mean thallus temperature when active was just above zero degrees and much higher than the annual mean air temperature of -15 to - 19℃. Because major snow melts occurred when incident radiation was high, the lichen was also subjected to very high PPFD when active, often more than 2,500 (xmol photon m~(-2) s~(-1). The major environmental stress appeared to be high light rather than low temperatures, and the variability of early season snow fall means that prediction of activity will be very difficult.
机译：地衣是南极植被的主要组成部分。它们还具有多羟基，仅在水合时才具有代谢活性。后勤约束意味着我们对地衣活动期的长度，时间或环境条件一无所知。我们提出了对南极洲罗斯海地区植物园湾（纬度77°S）的地衣性脐带藻活动的三年监测结果。使用特殊的荧光计以2或3小时的间隔记录允许检测水合代谢活性的叶绿素荧光参数。每小时记录一次空气和th温度和入射PPFD（光合光子通量密度，μmol光子m〜（-2）s〜（-1））。活动在几个月和几年之间变化很大，并且总体而言，地衣在28个月的7％内活跃。春季积雪经常延迟了活动的开始。融雪后的这段时间通常非常高效，而随后的1月至3月则很少活动或没有活动。活跃时的th气平均温度刚好高于零度，远高于年平均气温-15至-19℃。由于入射辐射高时主要雪融化，因此地衣在活动时也受到很高的PPFD的作用，通常超过2500（xmol光子m〜（-2）s〜（-1）。高光而不是低温，而且早期降雪的多变性意味着对活动的预测将非常困难。

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  • 来源
    《Polar biology》 |2011年第1期|p.13-22|共10页
  • 作者

    Burkhard Schroeter; T. G. Allan Green; Stefan Pannewitz; Mark Schlensog; Leopoldo G. Sancho;

  • 作者单位

    Botanical Institute, University of Kiel, 24098 Kiel, Germany,Leibniz Institute for Science and Mathematics Education, University of Kiel, Olshausenstr. 62, 24098 Kiel, Germany;

    Biological Sciences, University of Waikato, Private Bag 3105, Hamilton, New Zealand,Vegetal II, Farmacia Facultad, Universidad Complutense, 28040 Madrid, Spain;

    Botanisches Institut, Christian-Albrechts-Universitat, 24098 Kiel, Germany;

    Botanisches Institut, Christian-Albrechts-Universitat, 24098 Kiel, Germany;

    Vegetal II, Farmacia Facultad, Universidad Complutense, 28040 Madrid, Spain;

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  • 正文语种 eng
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  • 关键词

    snow fall; hydration; productivity; stress;

    机译：降雪保湿生产率;强调;

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