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Effect of springtime solar ultraviolet-B radiation on growth of Colobanthus quitensis at Palmer Station, Antarctica

机译：春季太阳紫外线B辐射对南极洲帕尔默站疣猴生长的影响

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We examined the influence of solar ultraviolet-B radiation (UV-B; 280-315 nm) on the growth of Colobanthus quitensis plants by placing them under contrasting UV-B filters at Palmer Station, along the Antarctic Peninsula. The filters reduced diurnal biologically effective UV-B (UV-B-BE ) either by 83% ('reduced UV-B') or by 12% ('near-ambient UV-B') over the 63 day experiment (7 November 1998-8 January 1999). Ozone column depletion averaged 17% during the experiment. Relative growth and net assimilation rates of plants exposed to near-ambient UV-B were 30 and 20% lower, respectively, than those of plants exposed to reduced UV-B. The former plants produced 29% less total biomass, as a result of containing 54% less aboveground biomass. These reductions in aboveground biomass were mainly the result of a 45% reduction in shoot biomass, and a 31% reduction in reproductive biomass. Reductions in shoot biomass were owing to an 18% reduction in branch production by main shoots, while reductions in reproductive biomass were the result of a 19% reduction in individual capsule mass. Total plant leaf area was reduced by 19% under near-ambient UV-B, although total leaf biomass was unaffected because leaves had a greater specific leaf mass. The reduction in plant leaf area under near-ambient UV-B was attributable to: (1) production of 11% fewer leaves per main shoot system and plant, which resulted from an 18% reduction in branch production by main shoots. Leaf production per individual main shoot or branch was not affected; (2) shorter leaf longevity-main shoots contained 14% fewer green leaves at a given time; and (3) smaller individual leaves-leaf elongation rates were 14% slower and mature leaves were 13% shorter. [References: 40]
机译：我们通过将其置于南极半岛帕尔默站的对比UV-B滤光片下，研究了太阳UV-B辐射（UV-B; 280-315 nm）对疣猴植物生长的影响。在为期63天的实验（11月7日）中，过滤器将昼夜生物学有效UV-B（UV-B-BE）降低了83％（“降低的UV-B”）或12％（“接近环境UV-B”）。 1998年8月8日）。在实验过程中，臭氧层消耗平均为17％。暴露于接近环境UV-B的植物的相对生长和净同化率分别比暴露于降低的UV-B的植物低30和20％。前者的植物产生的总生物量减少了29％，因为地上生物量减少了54％。地上生物量的减少主要是芽生物量减少了45％，生殖生物量减少了31％的结果。芽生物量的减少是由于主要芽的分支产量减少了18％，而生殖生物量的减少是单个胶囊质量减少了19％的结果。在近乎环境的UV-B下，植物总叶面积减少了19％，尽管总叶生物量不受影响，因为叶的比叶质量更大。在近乎环境紫外线B下的植物叶面积减少归因于：（1）每个主枝系统和植物的叶片产量减少11％，这是由于主枝的枝条产量减少18％。每个主枝或枝条的叶片产量不受影响; （2）较短的叶片寿命-在给定的时间里，主枝的绿色叶片减少了14％; （3）较小的单叶延伸率降低了14％，成熟叶缩短了13％。 [参考：40]

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