Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України
Introduction The examination of the thinning effect on the wood quality in planted Scots pine (Pinus sylvestris L.) stands in different forest site types is important. Such studies make it possible to evaluate the bioproductivity of stands and assess the extent of the use of the ecological potential...
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| Datum: | 2023 |
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Ukrainian Research Institute of Forestry and Forest Melioration named after G. M. Vysotsky (URIFFM)
2023
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| Online Zugang: | https://forestry-forestmelioration.org.ua/index.php/journal/article/view/362 |
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Forestry and Forest Melioration| _version_ | 1856543468592037888 |
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| author | Tkach , V. P. Tarnopilska , O. M. Ilchenko , S. V. Tarnopilskyi , P. B. Kobets , O. V. Lukianets, V. A. Rumiantsev, M. H. |
| author_facet | Tkach , V. P. Tarnopilska , O. M. Ilchenko , S. V. Tarnopilskyi , P. B. Kobets , O. V. Lukianets, V. A. Rumiantsev, M. H. |
| author_sort | Tkach , V. P. |
| baseUrl_str | |
| collection | OJS |
| datestamp_date | 2023-09-04T11:54:54Z |
| description | Introduction
The examination of the thinning effect on the wood quality in planted Scots pine (Pinus sylvestris L.) stands in different forest site types is important. Such studies make it possible to evaluate the bioproductivity of stands and assess the extent of the use of the ecological potential of local growing conditions, based on the annual production of pine stands.
Materials and Methods
The impact of high-intensity selective and linear-selective thinning treatments on natural and basic densities of wood, wood in bark, and bark of trunks in planted pine stands has been investigated. The study focused on middle-aged (51–52 years) pine stands in permanent experimental plots in the left-bank part of the Northern Steppe in Ukraine. Several thinning treatments of varying intensities have been carried out within the selected stands. The study was carried out in contrast variants in terms of stand density (1,500–700 trees?ha-1 and 2,700–1,600 trees?ha-1) in fresh relatively poor (B2) and dry poor (A1) forest sites. Forest mensuration and typological studies were carried out according to generally accepted methods (Hrom 2010, Vorobyov 1967). Tree trunk natural and basic densities for above-ground phytomass components were analyzed using the method of Lakida & Yudytsky (1993).
Results
The changes in the basic density of wood in different parts of the trunk and in different experimental variants were similar. The basic density decreased as the height of the trunk increased. In forest site type B2, basic wood density in all parts of the trunk in thinned stands was 8–25% higher than in denser stands. In forest site type A1, in contrast to B2, the changes in the wood basic density in dense and thinned stands were similar along the trunk height and did not differ statistically.
Conclusions
In the left-bank part of the Northern Steppe in Ukraine, in dry poor sites and in fresh relatively poor sites, no significant influence of the thinning intensity on the quality of pine wood was found in young and middle-aged planted pine stands. Important factors that affect the density of wood are the soil moisture and fertility.
A significant difference in the basic density was observed between the variants with different soil fertility and moisture, in particular between the fresh relatively poor forest site and dry poor forest site. For the dense stands, the average basic wood density in dry poor forest sites was 18% higher compared to fresh relatively poor forest sites. For thinned stands, these differences were 8%. For the average basic bark density, the values were 30% and 46% for dense and thinned stands, respectively, and for the average basic density of wood in bark – 18% and 19%, respectively.
In the steppe arid climatic conditions in Ukraine, in dry poor sites, and in fresh relatively poor sites, it is advisable to carry out high-intensity thinning of planted pine stands at a young age by linear or linear-selective methods. In a middle-aged pine stand, the first high-intensity thinning (up to 30% of the growing stock) should be carried out in a selective method. Such growing regimes for pine stands help increase their average heights and diameters, improve resistance to physical stress, and do not negatively affect the wood quality i.e. do not reduce its density.
The wood in the lower third of the trunk of pine trees is of better quality because its basic density is higher than in the upper part of the trunk. This fact should be taken into account when determining the quality of harvested wood.
2 Figs., 5 Tables, 34 Refs. |
| first_indexed | 2026-02-08T08:03:42Z |
| format | Article |
| id | oai:ojs2.forestry-forestmelioration.org.ua:article-362 |
| institution | Forestry and Forest Melioration |
| language | Ukrainian |
| last_indexed | 2026-02-08T08:03:42Z |
| publishDate | 2023 |
| publisher | Ukrainian Research Institute of Forestry and Forest Melioration named after G. M. Vysotsky (URIFFM) |
| record_format | ojs |
| spelling | oai:ojs2.forestry-forestmelioration.org.ua:article-3622023-09-04T11:54:54Z The impact of growing regimes for planted Scots pine stands on the quality characteristics of the tree trunk phytomass components in the left-bank part of the Northern Steppe of Ukraine Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України Tkach , V. P. Tarnopilska , O. M. Ilchenko , S. V. Tarnopilskyi , P. B. Kobets , O. V. Lukianets, V. A. Rumiantsev, M. H. Pinus sylvestris L. thinning thinning intensity natural density basic density wood bark wood in bark Pinus sylvestris L. рубки догляду інтенсивність рубки природна щільність базисна щільність деревина кора деревина в корі Introduction The examination of the thinning effect on the wood quality in planted Scots pine (Pinus sylvestris L.) stands in different forest site types is important. Such studies make it possible to evaluate the bioproductivity of stands and assess the extent of the use of the ecological potential of local growing conditions, based on the annual production of pine stands. Materials and Methods The impact of high-intensity selective and linear-selective thinning treatments on natural and basic densities of wood, wood in bark, and bark of trunks in planted pine stands has been investigated. The study focused on middle-aged (51–52 years) pine stands in permanent experimental plots in the left-bank part of the Northern Steppe in Ukraine. Several thinning treatments of varying intensities have been carried out within the selected stands. The study was carried out in contrast variants in terms of stand density (1,500–700 trees?ha-1 and 2,700–1,600 trees?ha-1) in fresh relatively poor (B2) and dry poor (A1) forest sites. Forest mensuration and typological studies were carried out according to generally accepted methods (Hrom 2010, Vorobyov 1967). Tree trunk natural and basic densities for above-ground phytomass components were analyzed using the method of Lakida & Yudytsky (1993). Results The changes in the basic density of wood in different parts of the trunk and in different experimental variants were similar. The basic density decreased as the height of the trunk increased. In forest site type B2, basic wood density in all parts of the trunk in thinned stands was 8–25% higher than in denser stands. In forest site type A1, in contrast to B2, the changes in the wood basic density in dense and thinned stands were similar along the trunk height and did not differ statistically. Conclusions In the left-bank part of the Northern Steppe in Ukraine, in dry poor sites and in fresh relatively poor sites, no significant influence of the thinning intensity on the quality of pine wood was found in young and middle-aged planted pine stands. Important factors that affect the density of wood are the soil moisture and fertility. A significant difference in the basic density was observed between the variants with different soil fertility and moisture, in particular between the fresh relatively poor forest site and dry poor forest site. For the dense stands, the average basic wood density in dry poor forest sites was 18% higher compared to fresh relatively poor forest sites. For thinned stands, these differences were 8%. For the average basic bark density, the values were 30% and 46% for dense and thinned stands, respectively, and for the average basic density of wood in bark – 18% and 19%, respectively. In the steppe arid climatic conditions in Ukraine, in dry poor sites, and in fresh relatively poor sites, it is advisable to carry out high-intensity thinning of planted pine stands at a young age by linear or linear-selective methods. In a middle-aged pine stand, the first high-intensity thinning (up to 30% of the growing stock) should be carried out in a selective method. Such growing regimes for pine stands help increase their average heights and diameters, improve resistance to physical stress, and do not negatively affect the wood quality i.e. do not reduce its density. The wood in the lower third of the trunk of pine trees is of better quality because its basic density is higher than in the upper part of the trunk. This fact should be taken into account when determining the quality of harvested wood. 2 Figs., 5 Tables, 34 Refs. Досліджено якісні показники фітомаси компонентів стовбура (локальну та середню природну й базисну щільності деревини, деревини в корі та кори) штучних насаджень сосни звичайної (Pinus sylvestris L.) різних режимів вирощування в лівобережній частині Північного Степу. Виявлено, що проведення рубок догляду сильної інтенсивності незначно вплинуло на показники локальної базисної щільності деревини: різниця між ними для густих і менш густих насаджень у межах одного екотопу на всіх відносних висотах є несуттєвою. Водночас суттєво більшим є показник середньої базисної щільності деревини в сухому бору, порівнюючи зі свіжим субором: у густих насадженнях – на 18,4 %, у менш густих – на 8,2 %. У степових посушливих кліматичних умовах України в сухому бору та свіжому субору в штучних насадженнях сосни не виявлено суттєвого впливу інтенсивності рубок догляду на якість деревини сосни. Ukrainian Research Institute of Forestry and Forest Melioration named after G. M. Vysotsky (URIFFM) 2023-06-29 Article Article application/pdf https://forestry-forestmelioration.org.ua/index.php/journal/article/view/362 10.33220/1026-3365.142.2023.35 Forestry and Forest Melioration; No. 142 (2023): Forestry and Forest Melioration; 35-46 Лісівництво і Агролісомеліорація; № 142 (2023): Лісівництво і Агролісомеліорація; 35-46 2663-4147 1026-3365 10.33220/1026-3365.142.2023 uk https://forestry-forestmelioration.org.ua/index.php/journal/article/view/362/335 http://creativecommons.org/licenses/by/4.0 |
| spellingShingle | Pinus sylvestris L. рубки догляду інтенсивність рубки природна щільність базисна щільність деревина кора деревина в корі Tkach , V. P. Tarnopilska , O. M. Ilchenko , S. V. Tarnopilskyi , P. B. Kobets , O. V. Lukianets, V. A. Rumiantsev, M. H. Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title | Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title_alt | The impact of growing regimes for planted Scots pine stands on the quality characteristics of the tree trunk phytomass components in the left-bank part of the Northern Steppe of Ukraine |
| title_full | Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title_fullStr | Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title_full_unstemmed | Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title_short | Вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині Північного Степу України |
| title_sort | вплив режимів вирощування штучних насаджень сосни звичайної на якісні ознаки компонентів фітомаси стовбура в лівобережній частині північного степу україни |
| topic | Pinus sylvestris L. рубки догляду інтенсивність рубки природна щільність базисна щільність деревина кора деревина в корі |
| topic_facet | Pinus sylvestris L. thinning thinning intensity natural density basic density wood bark wood in bark Pinus sylvestris L. рубки догляду інтенсивність рубки природна щільність базисна щільність деревина кора деревина в корі |
| url | https://forestry-forestmelioration.org.ua/index.php/journal/article/view/362 |
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