温度和湿度对南极叶状地衣南极脐鳞衣的一氧化碳吸收及水分流失总抗性的影响。
The effects of temperature and moisture on CO uptake and total resistance to water loss in the antarctic foliose lichen Umbilicaria antarctica.
作者信息
Harrisson P M, Walton D W H, Rothery P
机构信息
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK.
出版信息
New Phytol. 1989 Apr;111(4):673-682. doi: 10.1111/j.1469-8137.1989.tb02362.x.
Maximum net photosynthesis of field-fresh thalli, illuminated at 200 μmol photons m s (PAR), was attained at 13 °C and 1.10 g g water content. Small but significant rates of photosynthesis were measured at -5.5 °C. Depression of net photosynthesis at high thallus water contents is explained in terms of thallus anatomy. Calculation of evaporative resistance of the thallus by a new method showed a moisture-dependent response pattern, and was in agreement with direct observations made on other foliose species.
在200 μmol光子·平方米⁻²·秒⁻¹（光合有效辐射）光照条件下，鲜叶状体在13℃和1.10克·克⁻¹含水量时达到最大净光合速率。在-5.5℃时测得的光合速率虽小但显著。鲜叶状体含水量高时净光合速率降低可根据叶状体解剖结构来解释。用一种新方法计算叶状体的蒸发阻力显示出一种依赖水分的响应模式，并且与对其他叶状物种的直接观察结果一致。
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