Leaf area index (LAI), climatic conditions and aboveground biomass production in stands of red oak (Quercus rubra L.) and black walnut (Juglans nigra L.)
2006
Tokár, F., Slovak Academy of Sciences, Zvolen (Slovak Republic). Institute of Forest Ecology
In this paper we present evaluation of development of leaf area index (LAI) and aboveground biomass production in connection to climatic contitions in the stands of red oak (Quercus rubra L.) and black walnut (Juglans nigra L.) growing on the PRP series in Ivanka pri Nitre (Forestry administration Nitra, Forest enterprise Palárikovo). Over the whole developmental cycle, the highest LAI values were observed in the mixed stand consisting of black walnut and small-leaved linden. As for the aboveground biomass production, the best results were obtained in red oak monoculture, and at advanced age also in mixed stand of red oak and black walnut not subjected to tending (control PRP). In connection to climatic conditions, the highest values of mean periodical increment per leaf unit area (g per square dm per year) were reached in 1994–1998 and in 1999–2003, in all types of the stands. The absolute maximum (42.90 g per square dm per year) was reached in 1994–1998 in the improved mixed stand of red oak (20%) and black walnut (80%).
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