Scots pine (Pinus sylvestris L.) wood properties in an alkaline air pollution environment
| Autor: | Malle Mandre, Katri Ots, Regino Kask, Jaak Pikk |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Cement
Pollution Ecology biology Physiology Dust pollution media_common.quotation_subject Air pollution Scots pine Forestry Plant Science engineering.material medicine.disease_cause biology.organism_classification Pinus Compressive strength Agronomy Botany medicine engineering Environmental science Fertilizer media_common |
| Zdroj: | Trees. 22:815-823 |
| ISSN: | 1432-2285 0931-1890 |
| DOI: | 10.1007/s00468-008-0242-7 |
| Popis: | This paper examines the long-term influence on pine (Pinus sylvestris L.) wood properties of alkaline dust pollution (pH 12.3–12.7) emitted over 135 years from a cement plant in Estonia. A study of stemwood physical and mechanical properties in 70–80-year-old Scots pines growing in three zones of different air pollution levels showed serious deviations in comparison with a relatively healthy forest in an unpolluted area. Specimens from polluted trees evidenced smaller sapwood annual ring widths than those from the control trees. At the same time, the number of growth rings in sapwood at breast height increased under pollution. In the polluted areas, percentage of latewood in the annual ring widths was higher than in the unpolluted area. Small amounts of cement dust, which contains elements essential for the mineral nutrition of the trees, might have acted as fertilizer. Pine wood in the polluted stands exhibited increased density, bending strength across the grain, compression strength along the grain and, in some instances, hardness along the grain. |
| Databáze: | OpenAIRE |
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