"Whether we can somehow listen in on tree talk is a subject that was recently addressed in the specialized literature. Korean scientists have been tracking older women as they walk through forests and urban areas. The result? When the women were walking in the forest, their blood pressure, their lung capacity, and the elasticity of their arteries improved, whereas an excursion into town showed none of these changes. It's possible that phytoncides have a beneficial effect on our immune systems as well as the trees' health, because they kill germs. Personally, however, I think the swirling cocktail of tree talk is the reason we enjoy being out in the forest so much. At least when we are out in undisturbed forests.
Walkers who visit one of the ancient deciduous preserves in the forest I manage always report that their heart feels lighter and they feel right at home. If they walk instead through coniferous forests, which in Central Europe are mostly planted and are, therefore, more fragile, artificial places, they don't experience such feelings. Possibly it's because in ancient beech forests, fewer "alarm calls" go out, and therefore, most messages exchanged between trees are contented ones, and these messages reach our brains as well, via our noses. I am convinced that we intuitively register the forest's health."
- Peter Wohlleben (1964 - )
The Hidden Life of Trees
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