REDUCTION OF WOOD BASIC DENSITY IN DECAYED GREY ALDER STEMS

Authors

  • Jānis Liepiņš Latvian State Forest Research Institute 'Silava'
  • Alise Bleive Latvian State Forest Research Institute 'Silava'
  • Andis Lazdiņš Latvian State Forest Research Institute 'Silava'
  • Kaspars Liepiņš Latvian State Forest Research Institute 'Silava'

DOI:

https://doi.org/10.15544/RD.2021.043

Keywords:

wood decay, carbon stock, Alnus incana, stemwood density

Abstract

This pilot study aims to estimate the impact of the internal stem decay on wood basic density in grey alder stems. Accurate estimates of stem biomass are crucial in reducing the uncertainty in the estimation of forest stand biomass. The density data were obtained from 21 decayed trees and from 15 healthy trees as reference sampled in five forest stands in Latvia. In total, the densities of 401 intact wood, 212 discoloured wood and 117 spongy rot specimens were measured obtained from the cross-cut discs of sampled trees. The Kruskal Wallis test was used to determine the statistically significant differences between mean values of intact wood, discoloured wood and spongy rot basic density. Our analysis revealed that mean basic density of intact wood differed significantly (p < 0.01) from the mean values of discoloured wood – 361.3 kg m-3 and spongy rot – 240.9 kg m-3 suggesting that decrease in wood density due to the internal decay must be taken into account for the stem biomass calculations. Our findings indicate that spongy rot incidence varied strongly between individual forest stands, from 2.4% – 80.9%. Other studies have confirmed that not only the density but also the carbon content of wood varies by its decomposition process.

Downloads

Published

2022-01-25

Issue

Section

Multifunctional Approach for Sustainable Use of Bio-Resources