Ground-level ozone reduces the growth rate of trees. Free Technical Library News

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Ground-level ozone reduces tree growth

27.01.2009

At the beginning of the industrial revolution, not only did the amount of carbon dioxide in the atmosphere increase: the concentration of ground-level ozone increased fourfold.

It is believed that this gas is formed during the photochemical reaction of nitrogen oxides with the products of incomplete combustion of organic fuel. It is natural to expect that, firstly, it somehow affects living beings, and secondly, that its concentration will continue to grow.

University of Illinois Center for Atmospheric Research researcher Victoria Wittig analyzed data from more than 250 publications in peer-reviewed journals and came up with the following estimate: the rate of tree biomass formation is now 7% less than in 1800. And if the ozone growth rate continues, then by 2100 biomass will grow another 10% slower. Moreover, broad-leaved trees suffer more than conifers.

All of this means that ozone, and a greenhouse gas in itself, contributes further to global warming by preventing trees from utilizing CO2.

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