Effect of Shelterwood and Clear-Cutting Regeneration Method on Wood Density of Scots Pine

Abstract

With the gradual decline in the proportion of spruce as the most important tree species in the Czech Republic, the importance of pine will increase. The test material for this study was selected from two localities with important representation of pure Scots pine stands. Two stands, representing clear-cutting and shelterwood regeneration methods were selected from each locality. In the case of shelterwood method, tree samples from a lower layer were cut down and subsequently evaluated in terms of the impact of the regeneration method on the density of the wood, the density of earlywood and latewood, the proportion of latewood and the width of the annual rings. These qualitative parameters of the wood were compared before and after the release of the parent stand canopy. The clear-cutting regeneration method served as a reference. The values obtained before the release of the parent stand canopy are significantly different from values after its removal (share of latewood 47.7% and 48.1% before the release in contrast to 39.5% and 39.1% after the release for the locality 1 and the locality 2 respectively). The shelterwood regeneration method has not a significant impact on the overall investigated characteristics. Most significant was the impact of the regeneration method on the distribution of properties along the trunk radius, where the shelterwood method shows a uniform density distribution from the pith to the bark. From the view of industry, therefore, it is not important for the final processing which part of the trunk the wood comes from.

The Structural, Physical, and Mechanical Properties of Wood from Scots Pine (Pinus sylvestris L.) Affected by Scots Pine Blister Rust

“…The density of healthy wood was found to be similar to the values reported for samples taken at mid-stem height [12,13]. The values reported by other researchers [15,18,[24][25][26]31,32] are similar to ours or larger due to changes in density with tree height [13,15,18,[20][21][22]26,48]. The basic density of infected wood was much greater than that of healthy wood.…”

“…These criteria are met by the Scots pine, which is one the most important tree species in the world. It has been primarily studied in terms of its structure [12,13] and physical properties [14][15][16][17][18][19][20][21] (and especially density [13,[22][23][24][25][26][27][28]) as well as mechanical properties [29][30][31][32][33].…”

Numerical Simulation of the Deformation Behavior of Softwood Tracheids for the Calculation of the Mechanical Properties of Wood–Polymer Composites

“…The ratio decreases with the width of the growth rings. Schoenfelder et al show that the percentage of LW at 1 mm ring width is about 55% and at 2 mm ring about 42% [24]. The modulus of elasticity decreases significantly with an increasing difference in the angle between the direction of growth and the load direction (corresponds to the fiber-load angle known from fiber composite technology), increasing humidity and temperature [21].…”

Research on Tree Ring Micro-Destructive Detection Technology Based on Digital Micro-Drilling Resistance Method

“…From the traditional tree disk sampling method and the increment borer sampling method to the computer tomography technology and the micro-drilling resistance technology, the detection of tree rings is constantly trying new methods and technologies in forestry operations [25,26]. However, the non-destructive tree ring detection equipment represented by computer tomography has the disadvantages of high cost and large equipment size, so it is difficult to be widely used in wild forestry practice [27][28][29]. Therefore, the micro-drilling resistance tree ring detection technology has high expectations and has become a widely used technology in the micro-destructive detection of tree rings.…”