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Articles containing the keyword 'wars'

Category : Article

article id 5139, category Article
Boguslaw Molski, Andrzej Bytnerowicz, Wojciech Dmuchowski. (1981). Content of sulphur and fluorine compounds in Scots pine needles as an indicator of air pollution in Poland. Silva Fennica vol. 15 no. 4 article id 5139. https://doi.org/10.14214/sf.a15366
Keywords: Pinus sylvestris; needles; Scots pine; inventory; Poland; air pollution; sulphur; soluble fluorides; Warsaw; Plock; chemical analysis
Abstract | View details | Full text in PDF | Author Info

Our preliminary findings indicate that the content of total sulphur and soluble fluorides in needles of the Scots pine (Pinus sylvestris L.) reflects the degree of air pollution with sulphur and fluorine compounds. A project for a map of air pollution in Poland, based on chemical analysis of Scots pine needles, is presented. Results of the total sulphur and soluble fluoride content in 2-year old needles from 15- to 25-year-old trees should yield a picture of air pollution with sulphur and fluorine compounds. The first stage will involve the preparation of a map of the area between the Warsaw and Plock agglomerations. This area will be divided into 10 squares with side dimension of 25 km each. Samples will be taken at 5 different sites in each square and also approximately every 5 km along a straight line between these towns.

  • Molski, E-mail: bm@mm.unknown (email)
  • Bytnerowicz, E-mail: ab@mm.unknown
  • Dmuchowski, E-mail: wd@mm.unknown

Category : Article

article id 7180, category Article
Eino Oinonen. (1967). The correlation between the size of Finnish bracken (Pteridium aquilinum (L.) Kuhn.) clones and certain periods of site history. Acta Forestalia Fennica vol. 83 no. 2 article id 7180. https://doi.org/10.14214/aff.7180
Keywords: regeneration; distribution; forest fire; Pteridium aquilinum; bracken fern; wars; ground fire
Abstract | View details | Full text in PDF | Author Info

In an earlier paper of the author it was established that bracken fern (Pteridium aquilinum (L.) Kuhn.) that the sporal regeneration of the species is almost entirely connected with fire, and that the size of the bracken fern clones, distinguished by their characteristics, was related to the time of the fire. The time of the fire was determined by the samples taken with auger from the trees on the sample plots. A large data on the occurrence of bracken fern was collected around Finland, but only part of it could be used in the previous study, as the trees of the site provided no means to find out it the site had been burned earlier.

In earlier studies, a mass occurrence of sporelings of bracken fern in England has been connected to cities bombed and burned during the World War II. In this study the data of the clones is connected to historical sources and the time of wars in Finland. The comparisons in this study have confirmed the results achieved by comparing the dimensions of the bracken clones to the fire dates. It was found that the wars have caused an increase in the regeneration frequency of bracken fern.

  • Oinonen, E-mail: eo@mm.unknown (email)

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