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Old Common Oaks (Quercus robur L.), often connected with myths and legends, are the largest trees occurring in Central Europe. The present paper describes twelve largest girthed specimens of the species growing in Poland. Authors, based on their own measurements and researches, prepared a ranking list of these unique trees and estimated their health condition. Moreover, their exact localizations in Mielno, Bąkowo, Piotrowice, Kadyny, Januszkowice, Zagnańsk, Rogalin, Nogat, Węglówka, Młock, Rudka and Karczmiska were described and most popular facts and stories from their history were given. The largest girthed Common Oak in Poland is “Napoleon” growing in Mielno (1042,5 cm in circumference), the second one is the oak from Bąkowo (1020 cm) and the third – “Chrobry” from Piotrowice. In total in Poland there are three specimens of Common Oaks with trunk circumference of more than 1000 cm, and five more with circumference between 900 and 1000 cm.
In 42 rural parks studied in years 1999 and 2000, and subsequently in years 2006 and 2007, 262 taxa and culta of trees and shrubs were recorded. The major constituents of tree stand are native deciduous trees. Rarely encountered are the following taxa: Abies concolor ‘Violacea’, A.procera, Araucaria araucana, Cedrus libani, Chamaecyparis lawsoniana, Ch. nootkatensis, Ch. pisifera, Ginkgo biloba, Juniperus virginiana, Metasequoia glyptostroboides, Picea omorika, Platanus orientalis, Pinus ponderosa, P. wallichiana, Sciadopitys verticillata, Sequoiadendron giganteum, Taxodium distichum, Thuja plicata, Th. standishii, Thujopsis dolabrata ‘Variegata’, Tsuga canadensis, Aesculus flava, Ailanthus altissima, Castanea sativa, Catalpa bignonioides, C. ×erubescens, C.speciosa, Celtis occidentalis, Cotinus coggygria ‘Rubrifolius’, Cornus controversa, Fagus sylvatica ‘Asplenifolia’, Fraxinus americana, Gleditsia triacanthos, J. cinerea, Juglans ailantifolia, J. nigra, Liriodendron tulipifera, Magnolia acuminata, M. ×soulangeana, P. orientalis, Populus trichocarpa, Robinia viscosa, Sophora japonica, Syringa meyeri, T. ‘Euchlora’, Tilia americana, T. tomentosa ‘Pendula’ Q. palustris, Quercus cerris.
In Poland black locust grows generally in parks, gardens and along roads and in forests as well. During dendrological inventories specialists often need information about age of a tree. Simple noninvasive methods utilize mainly relation between age and size of a tree. One of such methods is mathematical formula describing relation between tree's diameter (or circumference) and its age. The main objectives of the presented paper is to elaborate such formulae for trees growing either in forests stands or in an open space (single tree, trees alley or small groups). Relations between tree's age and circumference were analyzed on the background of measured trees growing in forests administrated by the State Forests National Forest Holding from a whole territory of Poland. The formulae describing relation between tree's age and circumference were developed based on 20,302 database records for trees growing in forest stands and 6267 records for trees growing in an open space. In both cases power functions showed the best matching (tab. 1) in 95% confidence interval and which lead to construction of the age tables (tab. 2 and 3). Both elaborated formulae were tested and checked out with four series of measurement data. Three control series (1 – 'Siemianice', 2 – 'WPN' and 3 – 'Zielonka') show compatibility with analysed formulae, while the fourth one (4 – ‘Poznan') differed substantially. The probable reason of such situation lies in the fact that this series represented trees growing in urban conditions and having completely different growth rate.
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