Department of Forestry Economics and Technology, Faculty of Forestry and Wood Technology,
Poznan University of Life Sciences, Poznan, Poland, Poland
Submission date: 2024-08-28
Final revision date: 2024-12-06
Acceptance date: 2025-01-02
Online publication date: 2025-03-14
Corresponding author
Włodzimierz Stempski
Department of Forestry Economics and Technology, Faculty of Forestry and Wood Technology,
Poznan University of Life Sciences, Poznan, Poland, Wojska Polskiego 71c, 60-625, Poznań, Poland
Crowns of trees neighboring a strip road are exposed to greater amounts of sunlight, which may result in the so-called edge effect, leading to enhanced tree growth. The aim of this study was to assess the edge effect after twenty years since the clearing of strip roads in terms of diameters at breast height (DBH) and tree height, as well as crown base height and crown length. Based on the results of earlier measurements temporal changes in tree diameters at strip roads were also evaluated. Analyses were conducted in a pine stand, where strip roads of 3.5 m wide strip roads) and 2.5 m narrow strip roads) were cleared at the stand age of 31 years. After eight years the width of the narrow strip roads was increased to 3.5 m. Measurements were taken on trees growing directly at strip roads (edge trees) and those approx. 4.5 m from the road axis, as well as in middle of the distance between neighboring strip roads (as a reference). Trees growing at strip roads edge had statistically significantly larger diameters at breast height than trees growing farther from strip roads. These differences in tree height were slight and statistically non-significant, whereas crowns of trees growing at the strip road edges had lower bases and were longer compared to crowns of other trees. Analysis of DBH data recorded during 20-year measurements showed a gradual reduction in the effect of strip roads on diameters of trees growing at strip road edges.
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The edge effect of the strip roads 20 years after they had been cleared was still evident in relation to most analyzed biometric characteristics of trees in their vicinity.
Edge trees had statistically significantly greater diameters at breast height compared to trees growing deeper within the stand. There were no differences in tree height, whereas crown base heights of edge trees were lower and the crowns were statistically significantly longer.
Analysis of 20-year measurement data for diameter at breast height showed a gradual reduction of the effect of strip roads on diameters of edge trees. This phenomenon was markedly more regular in character for strip roads of greater initial width.
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