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Changes of dominant tree species areas over the past century in Lithuania: a mathematical approach
2014
Varnagiryte-Kabasinskiene, I., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr., (Lithuania);Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Kabasinskas, A., Kaunas Univ. of Technology (Lithuania);Kaunas College (Lithuania)
The changes of areas of eight tree species in Lithuania during the past century were analysed. Aiming to apply the different approaches in forest studies, the Exponential smoothing method for forecasting the changes of the tree areas for the 25 years was used. The data dating from 1922 was analyzed as a time series. The descending trend was identified for Scots pine (Pinus sylvestris L.) and European ash (Fraxinus excelsior L.) and increasing trend – for Norway spruce (Picea abies (L.) H. Karst.), common oak (Quercus robur L.), birch species (Betula pubescens Ehrh. and Betula pendula Roth), black alder (Alnus glutinosa (L.) Gaertn.), European aspen (Populus tremula L.) and grey alder (Alnus incana (L.) Moench). The Exponential Trend with Multiplicative Seasonality (ET-MS) model was fitted for almost all investigated tree species with exception of European ash. For the latter species, the Damped Trend with Multiplicative Seasonality (DT-MS) model was chosen. Mean absolute percentage error of the model in all cases did not exceed 2%.
Afficher plus [+] Moins [-]Research on birch species in Lithuania: a review study
2014
Araminiene, V., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr.(Lithuania) | Varnagiryte-Kabasinskiene, I., Lithuanian Research Centre for Agriculture and Forestry, Akademija, Kedainiai distr.(Lithuania);Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)
This brief review of the recent birch studies is focused on different aspects, such as species distribution, growing conditions, species identification, changes due to environmental factors. All mentioned investigations were carried out in Lithuania. This analytical study summarises the results and increases knowledge dissemination to the international audience. When reviewed and summarized considerable part of relevant literature sources, we realised new problems and challenges; for example, aiming to clarify the peculiarities of the growth and crown condition of the dominant birch species (Betula pendula Roth. and B. pubescens Ehrh.) under the changing climate and anthropogenic pollution.
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