科研之友
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摘要
Pollen analysis was performed on a core collected from a peat bog near the touristic hut Kumata in Vitosha Mountain. For the first time palynological information from this mountain was combined with a detailed radiocarbon chronology for the last 1400 years and quantitative determination of microcharcoal particles as paleoecological evidence for forest fires. Between 600 and 1200 years AD the surroundings of the peat bog were overgrown by a dense Picea abies forest with an admixture of Pinus and Abies alba. Mixed oak forests with Carpinus betulus and Corylus were distributed at lower altitudes. A large-scale disturbance in the coniferous and deciduous forest belts started after ca. 1500 years AD. The areas occupied by the conifers were considerably reduced and subsequently colonized by grasses and stands of Juniperus. The peak of microcharcoal particles suggests the existence of forest fires caused by humans to enlarge pasture land. The last 300 years marked the strongest intensification of the anthropogenic impact in all vegetation belts.
- 出版日期2016
