Why do pines and spruces in cities suffer from air pollution more than birches and poplars?

Pines and spruce trees in cities suffer from air pollution more than birches and poplars because deciduous trees, having picked up the harmfulness, shed their foliage annually, and the needles of coniferous trees live longer than 3-5 years. A huge amount of harmful substances accumulates in the leaves, which negatively affect the life of plants: gas exchange and respiration processes are weakened, growth is weakened, poisoning and oppression of the plant occurs. The trouble with plants in the city is acid rains, which wash out the substances necessary for plants from the soil, acquiring them for starvation. Conifers are the most sensitive to all kinds of urban hazards.
When trees are weakened by pollution, they become susceptible to natural stresses such as pests, diseases, climate fluctuations (droughts, frosts, etc.), which they were able to withstand before. Under the influence of harmful emissions from conifers:
– the lifespan of needles decreases;
– shoots die off; – the width of the annual rings decreases;
– the crown is thinning;
– tissue necrosis (necrosis) appears.

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