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The influence of weather conditions on annual height increments of Scots pine

Katarzyna KaźmierczakBogna Zawieja — 2014

Biometrical Letters

Annual height increments are a very important characteristic of Scots pine. They have a direct effect on the determination of the dendrometric properties of a stand, such as volume increment. In the present study the data concern height increments of the main shoot in selected age classes of trees (age 72 to 92 years). A relationship is determined between the values of the increments and meteorological conditions such as temperature, precipitation and sunshine. On the basis of lasso regression analysis,...

Allocation of oaks to Kraft classes based on linear and nonlinear kernel discriminant variables

Bogna ZawiejaKatarzyna Kaźmierczak — 2016

Biometrical Letters

A method of discriminant variable determination was used to visualize the division of oak trees into Kraft classes. Usual discriminant variables and several types of kernel discriminant variables were studied. For this purpose the traits of oak (Quercus L.) trees, measured on standing trees, were used. These traits included height of tree, breast height diameter and crown projection area. The use of the Gaussian kernel and modified Gaussian kernel enabled the clearest division into Kraft classes....

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