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Ecophysiological observations on Drosophyllum lusitanicum

机译：Drosophyllum lusitanicum的生理生态观察

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摘要

The carnivorous plant Drosophyllum lusitanicum inhabits heathland and ruderal sites in Portugal, Spain and Morocco. In the literature, various theories have been discussed concerning the ability of Drosophyllum to survive the annual dry period in summer. In August 2004, we examined: (1) the microclimate, (2) soil parameters and (3) the physiological conditions of the plants on two sites in Portugal and Spain. First, during the day, plants are exposed to very high air and soil temperatures and very low air humidity. The climatic extremes are not significantly softened by the population, only the wind speed is drastically decreased. During the night, on the other hand, very high air humidity and dew formation could be observed. The harsh climate is accompanied by stressful soil conditions. Second, the soil is completely dry, poor in fine earth, calcium and nutrients and more or less acid. Third, in spite of these climatic and edaphic extremes, all plants were green, produced trapping mucilage and caught numerous animals. Far from being affected by these conditions, Drosophyllum showed even better growth and reproduction on more extreme sites. We analysed the root system and found living fine roots missing. The osmotic value of the plants is rather low and water storage organs are absent. Therefore we conclude that in summer Drosophyllum is nourished by the dew at night.
机译：食肉植物Drosophyllum lusitanicum栖息在葡萄牙，西班牙和摩洛哥的石南丛生和葬场所。在文献中，已经讨论了多种有关果蝇在夏季一年干旱时期生存的能力的理论。 2004年8月，我们检查了（1）小气候，（2）土壤参数和（3）葡萄牙和西班牙两个地点的植物的生理状况。首先，在白天，植物暴露于非常高的空气和土壤温度以及非常低的空气湿度中。人口并未显着缓解极端气候，只有风速急剧下降。另一方面，在夜间，可以观察到很高的空气湿度和结露。恶劣的气候伴随着紧张的土壤条件。其次，土壤是完全干燥的，贫瘠的土壤，钙和营养物质以及或多或少的酸。第三，尽管有这些极端的气候和世界性气候，但所有植物都是绿色的，能够诱捕粘液并捕获了许多动物。果蝇没有受到这些条件的影响，在更极端的地方表现出甚至更好的生长和繁殖。我们分析了根系，发现缺少活的细根。植物的渗透压值很低，并且没有储水器官。因此，我们得出的结论是，夏季，夜里的露珠会滋养果蝇。

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