FORMATION OF DEAD TREES AMONG ALDER YOUNG TREES IN CONDITIONS OF UKRAINIAN POLISSYA

U. M. Kotlyarevska, O. O. Avramchuk, V. M. Bilous

Abstract


The study of the peculiarities of the dynamics of mortmass components in plantations is possible due to the observation of the dead trees formation and the formation of downfall. There was conducted an observation of a tree stand at the experimental test area during 2015-2017. Trees in the list were divided into three groups according to the degree of development and taking into account the placement of their crowns in regard to the crowns of neighboring trees: living trees without signs of weakening; weakened and dying trees; deadwood trees. The first group of trees was 46.9 %, the second group – 8.8 %, the third group – 44.3 % of the total number of trees per 1 hectare. The distribution of trees does not correspond to normal, as the formation of experimental planting of seed natural origin have taken place in two stages for 2-3 years. Thus, out of 4950 live trees studied (without signs of weakening, weakened and dying) in 2015, in 2010, there were 4450 trees left in total, and the total number of dead trees grew by 500. Dying trees not only those that were attributed to a group of very weakened and dying last year, but also healthy trees. During 2015-2017, 200 trees moved from a group of living trees to a group of dead trees and turned into coarse woody debris and 300 – from the group of weakened and dying, that is, 40 % of the dead trees and trees that turned into coarse woody debris last year did not have any signs of weakening. Of the total number of dead trees in the period from 2015 to 2016, 11.3 % of the trees (1,000 trees per ha-1) were transformed into coarse woody debris, and from 2016 to 2017 12.8 % of trees (1133 trees per ha -1). The stock of trunks in the bark in alder young trees had increased by 8.2 % from 2015 to 2017 and amounted 210 m3∙ha-1. The stock of trunks in the bark of living without signs of weakening trees increased by 6.7 % from 2015 to 2016 and by 1.7 % from 2016 to 2017. The stock of weakened and dying trees increased by 28.6 % in the period from 2015 to 2016, and by 44.4 % – from 2016 to 2017. The stock of deadwood decreased by 4.3 % and by 13.6 %, respectively, from 2015 to 2016 and from 2016 to 2017. The stock of coarse woody debris in the period from 2016 to 2017 increased twice and amounted to 10 m3∙ha-1. The current stock change in alder young trees in the period from 2015 to 2017 is 9.0 m3∙ha-1. The current growth rate of the forest stand at the stock in alder young trees in the period from 2015 to 2017 is 11.5 m3∙ha-1. According to the results of the observation it was established that in alder young trees of seed origin on former agricultural lands there is an intensive formation of the dead trees due to natural liquefaction of the tree stand.


Keywords


tree stand; deadwood trees; coarse woody debris; black alder; stock of trunks

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References


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DOI: https://doi.org/10.15421/40270505

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