Modeling mean height growth of modal hardwood broadleaved stands in Ukraine
DOI:
https://doi.org/10.31548/forest2019.04.004Abstract
The development of dynamic site index scales is one of the main preceding steps for yield tables development for modal stands. The tight correlation of average height of a stand with other biometric indices requires application of a precautionary approach to its modeling and justifies the need for grouping the empirical data to take into account the biological growth patterns of individual tree species. The purpose of this research was to identify and account for the mean height growth patterns for the major hardwood broadleaved tree species of Ukraine, and to develop dynamic site index scales for the tree species and stand origins subject to the research. To achieve these objectives, two sources of experimental data were used, namely the database of Ukrainian State Industrial Association of Forest Management Planning «Ukrderzhlisproekt» dated 01.01.2011 with the stand level mensurational characteristics of stands, as well as the database of temporary sample plots laid in different regions of Ukraine containing information on height growth patterns of forest stands. Modeling of relative top heights on the basis of model trees data collected at the sample plots has shown that for oak, beech, and ash stands, values forecasted by the obtained mathematical models for the age over 100 years significantly exceed the actual data, which may be explained by the lack of experimental data for this age range. In order to remedy this problem, inputs from two sources have been combined, namely the research results on mean height growth patterns and the weighted average of heights for the older stands (100 to 200 years old), calculated from the database of stand level biometric description of forests in the context of the studied tree species and origin. As a result, we have developed models of guide curves describing height growth of hardwood broadleaved stands of seed and vegetative origin. The obtained dynamic site index scales were compared to the current standards for determining site index classes. The comparison has demonstrated growth differences, as well as some of the height growth patterns for individual tree species, including stands with admixture of hornbeam and ash.
Keywords: guide curve, top height, relative height, mathematical models, modal stands, origin of stands, dynamic site index scale.
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