Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine
The plantations involving Pseudotsuga menziesii (Mirb.) Franco were studied in various forest-growth conditions of the Western Forest-Steppe, represented by different numbers of plots with varying participation of the studied tree species in the stand composition, ranging from 5% to 100%. The most...
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Ukrainian National Forestry University
2024-10-01
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| Series: | Наукові праці Лісівничої академії наук України |
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| author | Iurii Debryniuk Stepan Myklush Yuriy Myklush |
| author_facet | Iurii Debryniuk Stepan Myklush Yuriy Myklush |
| author_sort | Iurii Debryniuk |
| collection | DOAJ |
| description | The plantations involving Pseudotsuga menziesii (Mirb.) Franco were studied in various forest-growth conditions of the Western Forest-Steppe,
represented by different numbers of plots with varying participation of the studied tree species in the stand composition, ranging from 5% to 100%. The most widely represented in the conditions of the region are plantations with the participation of Douglas fir (Pseudotsuga) in the conditions of fresh fertile site type (D2), where 30 plantations were sampled. Therefore, the research results specifically pertain to these forest-growth conditions.
Due to the significant variability of the share of P. menziesii in the stand composition, the plantations were divided into four groups based on the share percentage of the tree species (10-20%; 30-40%; 50-70%; 80-100%). The number of studied plantations within these groups was 12, 5, 4, and 9, respectively. Most of the studied plots are characterised by the share of the tree species in the stand composition of artificial plantations up to 40%.
The study of age-related changes in the average height, diameter, and volume of stemwood in plantations with varying shares of P. menziesii in fresh fertile site types revealed a moderate to very close relationship between age and the aforementioned forest mensuration indices. Among the stands involving P. menziesii, the highest volume of stemwood is found in stands where the tree species composition is at the level of 7-9 units.
In the age range of 25-37 years, the growth of Douglas fir in mixed plantations is characterised by a relatively low intensity, and with a low initial share in the stand composition, it constitutes 10-20% of the stemwood volume. As age increases, the growth intensity of the tree species rises, along with its proportion in the composition of the plantation.
In young stands (21-40 years old), the site index of P. menziesii is within classes Іа-Іb; at the age of 45-50 years, it has class Id; and at the age of 60-70 years, it is within classes Ib-Ic. Even in a plantation aged 105 years, the tree species maintains a high growth intensity (site index class Ic).
The observed variability in diameter change of Pseudotsuga menziesii across plantations, where the species’ share ranges from 10 to100%, significantly exceeds the variability in height growth. This suggests that interspecific competition within the plantation is much more noticeably reflected in diameter increment than in height growth.
Furthermore, the correlation between Pseudotsuga menziesii presence and the stand growing stock within the studied age range demonstrates a notably high value (> 0.91) applying both to the plantations as a whole and specifically to the proportion of growing stock of Douglas fir within them. As stand age increases, the relative presence of Pseudotsuga menziesii consistently rises, thereby amplifying its impact on the total stand volume.
It was not possible to establish final recommendations regarding optimising the initial planting density and the subsequent optimal proportion of Pseudotsuga menziesii within stand composition, which would ensure its maximum productivity. This limitation arises from the restricted sample size (limited number of objects for studies) and economic interventions impacting the growth dynamics of the plantations. Moreover, as Pseudotsuga matures, its growth rate intensifies, leading to an increasing share of the species within the total stand volume over time, which also needs to be taken into account when designing afforestation strategies and forest management practices to support sustainable stand development and productivity in mixed-species plantations.
The optimal strategy for Pseudotsuga menziesii plantation management involves modelling key measurement parameters, such as height, diameter, and stemwood volume, as they evolve with age, considering specific proportions of the species within distinct forest-growth conditions.
The documented age-related trends in Pseudotsuga menziesii measurement parameters within artificial plantations, combined with the optimization of forestry activities, will facilitate informed decision-making and allow for making rational decisions and determining priority directions for management strategies for Pseudotsuga plantations in fresh fertile site types in the western region of Ukraine. |
| format | Article |
| id | doaj-art-98e650122f24441ca05c51a360b09f02 |
| institution | Kabale University |
| issn | 1991-606X 2616-5015 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Ukrainian National Forestry University |
| record_format | Article |
| series | Наукові праці Лісівничої академії наук України |
| spelling | doaj-art-98e650122f24441ca05c51a360b09f022025-02-06T07:24:17ZengUkrainian National Forestry UniversityНаукові праці Лісівничої академії наук України1991-606X2616-50152024-10-012727119128https://doi.org/10.15421/412419822Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of UkraineIurii Debryniuk0https://orcid.org/0000-0002-0994-349XStepan Myklush1https://orcid.org/0000-0002-9762-1190Yuriy Myklush2https://orcid.org/0000-0002-1940-1045Ukrainian National Forestry UniversityUkrainian National Forestry UniversityUkrainian National Forestry UniversityThe plantations involving Pseudotsuga menziesii (Mirb.) Franco were studied in various forest-growth conditions of the Western Forest-Steppe, represented by different numbers of plots with varying participation of the studied tree species in the stand composition, ranging from 5% to 100%. The most widely represented in the conditions of the region are plantations with the participation of Douglas fir (Pseudotsuga) in the conditions of fresh fertile site type (D2), where 30 plantations were sampled. Therefore, the research results specifically pertain to these forest-growth conditions. Due to the significant variability of the share of P. menziesii in the stand composition, the plantations were divided into four groups based on the share percentage of the tree species (10-20%; 30-40%; 50-70%; 80-100%). The number of studied plantations within these groups was 12, 5, 4, and 9, respectively. Most of the studied plots are characterised by the share of the tree species in the stand composition of artificial plantations up to 40%. The study of age-related changes in the average height, diameter, and volume of stemwood in plantations with varying shares of P. menziesii in fresh fertile site types revealed a moderate to very close relationship between age and the aforementioned forest mensuration indices. Among the stands involving P. menziesii, the highest volume of stemwood is found in stands where the tree species composition is at the level of 7-9 units. In the age range of 25-37 years, the growth of Douglas fir in mixed plantations is characterised by a relatively low intensity, and with a low initial share in the stand composition, it constitutes 10-20% of the stemwood volume. As age increases, the growth intensity of the tree species rises, along with its proportion in the composition of the plantation. In young stands (21-40 years old), the site index of P. menziesii is within classes Іа-Іb; at the age of 45-50 years, it has class Id; and at the age of 60-70 years, it is within classes Ib-Ic. Even in a plantation aged 105 years, the tree species maintains a high growth intensity (site index class Ic). The observed variability in diameter change of Pseudotsuga menziesii across plantations, where the species’ share ranges from 10 to100%, significantly exceeds the variability in height growth. This suggests that interspecific competition within the plantation is much more noticeably reflected in diameter increment than in height growth. Furthermore, the correlation between Pseudotsuga menziesii presence and the stand growing stock within the studied age range demonstrates a notably high value (> 0.91) applying both to the plantations as a whole and specifically to the proportion of growing stock of Douglas fir within them. As stand age increases, the relative presence of Pseudotsuga menziesii consistently rises, thereby amplifying its impact on the total stand volume. It was not possible to establish final recommendations regarding optimising the initial planting density and the subsequent optimal proportion of Pseudotsuga menziesii within stand composition, which would ensure its maximum productivity. This limitation arises from the restricted sample size (limited number of objects for studies) and economic interventions impacting the growth dynamics of the plantations. Moreover, as Pseudotsuga matures, its growth rate intensifies, leading to an increasing share of the species within the total stand volume over time, which also needs to be taken into account when designing afforestation strategies and forest management practices to support sustainable stand development and productivity in mixed-species plantations. The optimal strategy for Pseudotsuga menziesii plantation management involves modelling key measurement parameters, such as height, diameter, and stemwood volume, as they evolve with age, considering specific proportions of the species within distinct forest-growth conditions. The documented age-related trends in Pseudotsuga menziesii measurement parameters within artificial plantations, combined with the optimization of forestry activities, will facilitate informed decision-making and allow for making rational decisions and determining priority directions for management strategies for Pseudotsuga plantations in fresh fertile site types in the western region of Ukraine.http://fasu.nltu.edu.ua/index.php/nplanu/article/view/822tree heighttree diameterstemwood volumeform factormodelling men-suration indicescorrelation strength |
| spellingShingle | Iurii Debryniuk Stepan Myklush Yuriy Myklush Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine Наукові праці Лісівничої академії наук України tree height tree diameter stemwood volume form factor modelling men-suration indices correlation strength |
| title | Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine |
| title_full | Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine |
| title_fullStr | Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine |
| title_full_unstemmed | Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine |
| title_short | Formation of forest mensuration indicators of Pseudotsuga menziesii (Mirb.) Franco in artificial plantations of the western region of Ukraine |
| title_sort | formation of forest mensuration indicators of pseudotsuga menziesii mirb franco in artificial plantations of the western region of ukraine |
| topic | tree height tree diameter stemwood volume form factor modelling men-suration indices correlation strength |
| url | http://fasu.nltu.edu.ua/index.php/nplanu/article/view/822 |
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