Abstract
UDK: 630*52:519.233.5]:582.475(497.6)
 As the result of sporadic afforestation of not-grown forest land in the past, today in B&H we have significant areas of even-aged forest plants of Scots pine of different ages. Estimate of yield capabilities of habitats/sites of these stands is one of very real issues in even-aged management planning for this tree species. In order to get the clear idea on the value of yield of even-aged stands, it is necessary to conduct long-term researches on permanent experimental plots. Considering that for the results of those researches it is necessary to wait approximately for the duration of production periods for specific tree species, to gain orientation solutions of the problem we can apply short-term researches – using temporary experimental plots set in stands of different ages. Members of the Forest Management Department of Forestry Faculty in Sarajevo in a period from 1985 to 1990 gathered data on temporary experimental plots in existing even-aged forest plantations of spruce, Scots pine and black pine in order to research their growth, structural and production characteristics. Part of those data for Scots pine is used for making of this document. Objective of this research was, based on data on measurement of 77 experimental plots positioned in even-aged not-tended plantations of Scots pine Bosnia-wide, to reach relevant information on the value of wood volume depending on their age and site quality, and to create the most favourable regression model for assessment of volume of large wood value based on known values of the stand taxation elements that could be easily and quickly determined. Besides this, in this document by comparing gained results with appropriate data from other authors we have evaluated productivity of even-aged not-tended forest plantations of Scots pine in B&H.
Highlights
Parts of not-grown forest land in B&H in the past were afforested with seedlings of spruce, Scots and black pine, so today we have significant areas of even-aged forest plantations of these tree species of different ages
In general we have a problem of managing evenaged stands because forest management companies on whose territory those even-aged stands are located do not have available basic findings and data about when to start with thinning, what type and intensity of thinning to use, how long production period should be and what yield could be produced, etc
Considering that for the results of those researches it is necessary to wait approximately for the duration of production periods for specific tree species, to gain orientation solutions of the problem we can apply short-term researches – using temporary experimental plots set in stands of different habitat conditions and different ages
Summary
After calculating typical values of taxation elements for each experimental plot, we have created regression model for assessment of volume of large wood value of even-aged stands (dependent variable) and for analysis of “net” impact of individual independent variables. In determined regression model the impact of age on volume of large wood value is expressed using Chapman-Richard function (KRAMER & AKÇA, 2003; CALDERON, 1989), impact of site quality is expressed in linear manner, while impact of degree of land coverage by forest stand canopy is expressed by second-order polynomial form. Based on assessed values of statistic parameters of multiple regression equation presented in Table 3 one can get an insight in what amount the changes in values of volume of large wood of the stand could be attributed to overall action of all factors covered by the regression model.
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