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Although industrial pollution of the atmosphere is the main threat of the forests, we should not ignores the mistakes with have been made up till now by the forest administration. The author is of an opinion that e.g. both the forest theory and practice have changed the concept of the forest as an ecosystem in favour of the forest regarded as a timber factory.
In the polluted forests in the neighbourhood of industrial centres mass appearance of some species of aphides, particularly resistant to SO₂, has been observed. The weakened trees being attacked by aphides and by other pests are not able to defend themselves and they perish. According to the author's opinion it is indispensable to undertake the preventive spraying with a solution containing the lacking...
Oczekuje się niekiedy, iż zobowiązania do ograniczenia emisji dwutlenku węgla mogą być osłabione przez sadzenie drzew. Opinia taka opiera się na nie całkiem słusznej wierze w to, że lasy zamieniają szkodliwy dwutlenek węgla na życiodajny tlen. W rzeczywistości stanowią one tylko rezerwuar dwutlenku węgla, natomiast ich długookresowy wkład do bilansu atmosfery jest neutralny. Dlatego też tak zwane...
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