Full text of this article is only available in PDF format.

Esko Kangas

Tutkimuksia kaasutuhoista Imatran valtionpuistossa

Kangas E. (1932). Tutkimuksia kaasutuhoista Imatran valtionpuistossa. Silva Fennica no. 23 article id 4464. https://doi.org/10.14214/sf.a9020

English title: Studies on gas damages in the state forests in Imatra.


A forest damage was detected in spring 1931 near electro-chemical factory in Imatra in Eastern Finland. It was deduced that it was caused by a gas discharge from the factory. A survey was made to describe the damages. Forests in the damaged area of five hectares were Scots pine (Pinus sylvestris L.) dominated and 60-80 years old. According to the factory, the exhaust gases contained 0.4 mg chlorine per liter. In addition, chlorate containing liquids evaporated thorough the chimney, which seemed to have been the main cause of the damage. The chlorates may have concentrated in the snow covering the trees during the winter. The Scots pine trees had lost all the needles in spring, but grew new needles in the summer. In some trees the new needles were few or undeveloped. Some mild damages were noticed in pine and Betula sp. during the growing season. Forest edges and trees higher that the other trees were worst damaged. Pine was most sensitive to the emission. Pine weakened by the gas damages were attacked by insects, the most important being Pissodes sp. The secondary insect damage is likely to kill the surviving trees. The dying pines should be removed only if it is necessary to prevent the spreading of insect damage. The trees may hinder the spreading of further gas emissions. In future, other tree species should be preferred over pine.

The PDF includes a summary in German.

Original keywords
ilman epäpuhtaudet; Imatra; kloori; lehtikato; metsätuhot; neulaskato; hyönteistuhot

English keywords
air pollutants; chlorine; emissions; needle loss; damage; leaf injuries; insect damage

Published in 1932

Available at https://doi.org/10.14214/sf.a9020 | Download PDF

Creative Commons License

Click this link to register for Silva Fennica submission and tracking system.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content

Your selected articles
Your search results
Mikola P., Kangas E. et al. (1959) Silvicultural research in Finland from 1909 to 1.. Silva Fennica vol. 70 no. 4 article id 7494
Mikola P., Kangas E. et al. (1959) Silvicultural research in Finland from 1901 to 1.. Silva Fennica vol. 70 no. 3 article id 7493
Kangas E. (1954) On the possibility of pests being conveyed in ex.. Silva Fennica vol. 61 no. 23 article id 7435
Kangas E. (1946) Drying of Norway spruce stands as forest damage .. Silva Fennica vol. 52 no. 5 article id 7383
Kangas E. (1942) Effect of seed extracting temperature on extract.. Silva Fennica vol. 50 no. 14 article id 7367
Kangas E. (1940) Studies on artificial regeneration in Pohjankang.. Silva Fennica vol. 49 no. 4 article id 7351
Kangas E. (1934) Entomological analyses and their applications Silva Fennica vol. 40 no. 6 article id 7283
Kangas E. (1932) Studies on gas damages in the state forests in I.. Silva Fennica vol. no. 23 article id 4464
Kangas E. (1931) Siikakankaan mäntytaimistojen tuhoista Silva Fennica vol. no. 17 article id 4458