A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland
Scots pine Pinus sylvestris L. is one of the most important trees species for wood industry in Sweden and in Poland. The silviculture is aiming for high quality timber. This study compares different regeneration methods, initial densities, improved planting material and their impact on wood quality...
| Autor principal: | |
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| Formato: | H2 |
| Lenguaje: | Inglés Otro |
| Publicado: |
SLU/Southern Swedish Forest Research Centre
2013
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| Materias: |
| _version_ | 1855570956532056064 |
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| author | Mackowiak, Tomasz |
| author_browse | Mackowiak, Tomasz |
| author_facet | Mackowiak, Tomasz |
| author_sort | Mackowiak, Tomasz |
| collection | Epsilon Archive for Student Projects |
| description | Scots pine Pinus sylvestris L. is one of the most important trees species for wood industry in Sweden and in Poland. The silviculture is aiming for high quality timber. This study compares different regeneration methods, initial densities, improved planting material and their impact on wood quality and growth. The study areas were located in Linnebjörke and Värnamo Forests (southern Sweden) and
in Potrzebowice State Forest district (western Poland). In total 30 circular plots were set up in Sweden and 8 in Poland. The results shows stand characteristics such as height, diameter, mean annual increment, volume and timber quality traits, i.e diameter of the thickest branch, crookedness, spike knots occurrence, damages and judged overall quality .
Planted stands had on average greater mean heights (34%), diameters (39%), mean annual increment (242%) compared to the naturally regenerated stands. The volume of pines planted under the normal shelter was on average (121%) of those planted under the dense shelter. Similarly the volume of the naturally regenerated pines under normal shelter was (346%) of the ones regenerated under the dense shelter. In Värnamo and Potrzebowice the plots planted in the lowest spacing (10.000/ha and 13.000/ha respectively) had the highest mean height, total volume per ha and MAI. The trees
originated from improved planting material characterized high external quality and good growth. On average the growth of height and volume was 5% and 4% greater compared to the not improved plots planted on the clear cut.
Naturally regenerated pine stands will have superior overall quality compared to the planted stands on
the clear cut. On average the mean branch diameter was (20%) lower in the naturally regenerated plots compared to the planted ones. In general, fewer severely crooked stems were recorded in the natural regeneration. Longer shelter period improved the quality of planted pines. The stem straightness was considerably poorer and diameter of branches higher in the wide planting (1600/ha) compared to the closer planting (10.000 and 13.000/ ha). According to the linear correlation between the diameter of the thickest branch and the diameter at breast height the naturally regenerated stands will give higher selection possibilities than the planted stands. |
| format | H2 |
| id | RepoSLU6104 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés Otro |
| publishDate | 2013 |
| publishDateSort | 2013 |
| publisher | SLU/Southern Swedish Forest Research Centre |
| publisherStr | SLU/Southern Swedish Forest Research Centre |
| record_format | eprints |
| spelling | RepoSLU61042013-09-27T08:56:14Z A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland Mackowiak, Tomasz Clear cut crookedness diameter of the thickest branch growth Scots pine Pinus Sylvestris natural regeneration spike knots wood quality Scots pine Pinus sylvestris L. is one of the most important trees species for wood industry in Sweden and in Poland. The silviculture is aiming for high quality timber. This study compares different regeneration methods, initial densities, improved planting material and their impact on wood quality and growth. The study areas were located in Linnebjörke and Värnamo Forests (southern Sweden) and in Potrzebowice State Forest district (western Poland). In total 30 circular plots were set up in Sweden and 8 in Poland. The results shows stand characteristics such as height, diameter, mean annual increment, volume and timber quality traits, i.e diameter of the thickest branch, crookedness, spike knots occurrence, damages and judged overall quality . Planted stands had on average greater mean heights (34%), diameters (39%), mean annual increment (242%) compared to the naturally regenerated stands. The volume of pines planted under the normal shelter was on average (121%) of those planted under the dense shelter. Similarly the volume of the naturally regenerated pines under normal shelter was (346%) of the ones regenerated under the dense shelter. In Värnamo and Potrzebowice the plots planted in the lowest spacing (10.000/ha and 13.000/ha respectively) had the highest mean height, total volume per ha and MAI. The trees originated from improved planting material characterized high external quality and good growth. On average the growth of height and volume was 5% and 4% greater compared to the not improved plots planted on the clear cut. Naturally regenerated pine stands will have superior overall quality compared to the planted stands on the clear cut. On average the mean branch diameter was (20%) lower in the naturally regenerated plots compared to the planted ones. In general, fewer severely crooked stems were recorded in the natural regeneration. Longer shelter period improved the quality of planted pines. The stem straightness was considerably poorer and diameter of branches higher in the wide planting (1600/ha) compared to the closer planting (10.000 and 13.000/ ha). According to the linear correlation between the diameter of the thickest branch and the diameter at breast height the naturally regenerated stands will give higher selection possibilities than the planted stands. Sosna zwyczajna to jeden z głównych gatunków lasotwórczych, którego drewno jest podstawowym materiałem wykorzystywanym w przemyśle drzewnym, zarówno w Szwecji, jak i w Polsce. Celem hodowli sosny jest produkcja drewna o wysokiej jakości. W niniejszej pracy magisterskiej porównany został wpływ różnych metod odnowienia, więźby sadzenia, oraz materiału sadzeniowego pochodzącego z wyłączonych drzewostanów nasiennych na przyrost i cechy jakościowe sosny. Badania terenowe zostały przeprowadzone w drzewostanach południowej Szwecji (Linnebjörke i Värnamo), oraz zachodniej Polski (Nadleśnictwo Potrzebowice). Wyniki przedstawiają charakterystykę badanych drzewostanów oraz jakość ich drewna. Przeciętnie, drzewostany posadzone na powierzchniach pozrębowych miały większe wysokości (34%), pierśnice (39%),oraz większy przeciętny przyrost roczny (242%) w porównaniu do powierzchni odnowionych naturalnie. Ponadto miąższość drzewostanów sosnowych posadzonych pod luźnym okapem drzew matecznych wynosiła (121%) tych, które posadzone zostały pod gęstym okapem drzew matecznych. Również, miąższość drzewostanów odnowionych naturalnie pod luźnym okapem drzew matecznych wyniosła (346%) tych, które zostały odnowione naturalnie pod gęstym okapem drzew matecznych. Powierzchnie pomiarowe w Värnamo i w Potrzebowicach odnowione w najgęstszych więźbach (10.000/ha i 13.000/ha) miały największa średnia wysokość, miąższość, oraz największy przeciętny przyrost roczny. Posadzone drzewostany, pochodzące z materiału sadzeniowego z wyłączonych drzewostanów nasiennych charakteryzowały się wysoką jakością i przyrostem. Przeciętnie odznaczały się 5 i 4%, większym przyrostem wysokości i miąższości w porównaniu do posadzonych drzewostanów lokalnej proweniencji. Naturalnie odnowione drzewostany sosnowe będą cechowały się lepszą ogólną jakością, w porównaniu do drzewostanów odnowionych sztucznie. Przeciętnie, średnia wielkość najgrubszych gałęzi była (20%) mniejsza w naturalnych odnowieniach. Ponadto, mniej szczególnie krzywych strzał sosnowych, eliminujących je do dalszego przemysłowego wykorzystania zanotowanych zostało w drzewostanach sosnowych odnowionych naturalnie. Sosny posadzone pod długo trwającą osłoną drzew matecznych, odznaczały się lepszą jakością. Jakość starzał sosen posadzonych w bardzo luźnych więźbach (1600/ha) była bardzo niska, a średnica gałęzi znacząca, w porównaniu do powierzchni posadzonych w gęstych więźbach 10.000/ha i 13.000/ha). Współczynnik korelacji liniowej pomiędzy średnicą najgrubszej gałęzi a pierśnicą drzew był niższy w naturalnych odnowieniach. A zatem, drzewostany naturalnie odnowione cechują się większymi możliwościami selekcji. SLU/Southern Swedish Forest Research Centre 2013 H2 eng other https://stud.epsilon.slu.se/6104/ |
| spellingShingle | Clear cut crookedness diameter of the thickest branch growth Scots pine Pinus Sylvestris natural regeneration spike knots wood quality Mackowiak, Tomasz A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title | A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title_full | A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title_fullStr | A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title_full_unstemmed | A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title_short | A comparison between wood quality and growth in planted and naturally regenerated Scots pine (Pinus sylvestris L.) stands in Sweden and in Poland |
| title_sort | comparison between wood quality and growth in planted and naturally regenerated scots pine (pinus sylvestris l.) stands in sweden and in poland |
| topic | Clear cut crookedness diameter of the thickest branch growth Scots pine Pinus Sylvestris natural regeneration spike knots wood quality |