En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion
Sitka spruce (Picea sitchensis) is a tree species that have its natural distribution along the West Coast of North America, from Alaska in the north to northern California in the south. Sitka spruce is a typical coastal tree species that can reach heights up to 85 meters and occurs in single pure...
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| Formato: | L3 |
| Lenguaje: | sueco Inglés |
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SLU/Southern Swedish Forest Research Centre
2005
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| Materias: |
| _version_ | 1855571910598852608 |
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| author | Tengberg, Fredrik |
| author_browse | Tengberg, Fredrik |
| author_facet | Tengberg, Fredrik |
| author_sort | Tengberg, Fredrik |
| collection | Epsilon Archive for Student Projects |
| description | Sitka spruce (Picea sitchensis) is a tree species that have its natural distribution along the
West Coast of North America, from Alaska in the north to northern California in the south.
Sitka spruce is a typical coastal tree species that can reach heights up to 85 meters and occurs
in single pure as well as in mixed stands.
The main purposes of this study were to describe the Sitka spruce growing characteristics and
the volume production in comparison to spruce (Picea abies). The possibility to predict future
volume production by using prognosis tools designed to be used on spruce were also studied.
The material that has been used in this study are permanent sitka trials established by the
Faculty of Forestry fixed Sitka trials and also material gathered in this study.
A literature study was also carried out in order to determine the Sitka spruce growing
characteristics.
Sitka spruce has a high adaptation and a high volume production on a broad scale of soil
types. The tree species is a pioneer species that has a fast early growth and in combination
with sharp needles it is less susceptible to animal browsing than spruce. The factor that is the
single most limiting factor for where the Sitka spruce can be planted is frost. This factor can
be limited by using plant material with a well-suited provenance.
According to the literature, the Sitka spruce has an average total volume production that is
between 20-40% higher than spruce. The result in this study indicate that the average
difference in total volume production were 14% higher for Sitka, on soils with the same site
index. There were a big distribution in the results and if only the three best stands were
studied the average Sitka spruce total volume production were approximately 30% higher
than for the comparable spruce stands. The origin of plant materials has a big impact on
production level and in those cases were the Sitka spruce production is below the spruce
production, there are strong evidence that the Sitka spruce is represented by a poor material.
By using prognosis tools, designed for spruce stands, the possibility to predict future
production in Sitka stands were studied and compared. The prognosis tool that were used
were ProdMod (Production Model) and height increment curves for spruce (Eriksson, 1976).
The prognosis that gave the best result were when the two prognosis tools were combined.
The results from this study shows that the prognosis underestimated the average volume
production with approximately 3%. This indicates that there are good possibilities to predict
future volume production by using prognosis tools intended to be used for spruce stands.
When the top height increment were compared between the two tree species the Sitka spruce
had a more durable height increment than spruce. |
| format | L3 |
| id | RepoSLU11638 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2005 |
| publishDateSort | 2005 |
| publisher | SLU/Southern Swedish Forest Research Centre |
| publisherStr | SLU/Southern Swedish Forest Research Centre |
| record_format | eprints |
| spelling | RepoSLU116382017-10-02T08:38:46Z En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion A production comparison between sitka spruce (Picea sitchensis) and spruce (P. abies) Tengberg, Fredrik Picea sitchensis sitkagran Picea abies volymproduktion odlingsegenskaper ProdMod Sitka spruce (Picea sitchensis) is a tree species that have its natural distribution along the West Coast of North America, from Alaska in the north to northern California in the south. Sitka spruce is a typical coastal tree species that can reach heights up to 85 meters and occurs in single pure as well as in mixed stands. The main purposes of this study were to describe the Sitka spruce growing characteristics and the volume production in comparison to spruce (Picea abies). The possibility to predict future volume production by using prognosis tools designed to be used on spruce were also studied. The material that has been used in this study are permanent sitka trials established by the Faculty of Forestry fixed Sitka trials and also material gathered in this study. A literature study was also carried out in order to determine the Sitka spruce growing characteristics. Sitka spruce has a high adaptation and a high volume production on a broad scale of soil types. The tree species is a pioneer species that has a fast early growth and in combination with sharp needles it is less susceptible to animal browsing than spruce. The factor that is the single most limiting factor for where the Sitka spruce can be planted is frost. This factor can be limited by using plant material with a well-suited provenance. According to the literature, the Sitka spruce has an average total volume production that is between 20-40% higher than spruce. The result in this study indicate that the average difference in total volume production were 14% higher for Sitka, on soils with the same site index. There were a big distribution in the results and if only the three best stands were studied the average Sitka spruce total volume production were approximately 30% higher than for the comparable spruce stands. The origin of plant materials has a big impact on production level and in those cases were the Sitka spruce production is below the spruce production, there are strong evidence that the Sitka spruce is represented by a poor material. By using prognosis tools, designed for spruce stands, the possibility to predict future production in Sitka stands were studied and compared. The prognosis tool that were used were ProdMod (Production Model) and height increment curves for spruce (Eriksson, 1976). The prognosis that gave the best result were when the two prognosis tools were combined. The results from this study shows that the prognosis underestimated the average volume production with approximately 3%. This indicates that there are good possibilities to predict future volume production by using prognosis tools intended to be used for spruce stands. When the top height increment were compared between the two tree species the Sitka spruce had a more durable height increment than spruce. Sitkagranen (Picea sitchensis) är ett trädslag vars naturliga utbredningsområde sträcker sig längs Nordamerikas västkust, från Alaska i norr till norra Kalifornien i söder. Sitkagran är ett typiskt kustträdslag som kan nå upp till 85 meter i höjd och förekommer i så väl trädslagsrena bestånd som i blandbestånd. Syftet med arbetet var att redogöra för sitkagranens odlingsegenskaper, volymproduktionen i jämförelse med gran, vidare syfte är att undersöka möjligheten att prognostisera framtida utveckling, med hjälp av prognosinstrument avsedda för gran. Materialet som ligger till grund för studien är dels Skogsfakultetens fasta försöksytor med sitkagran dels eget insamlat material. Dessutom genomfördes en litteraturstudie för att allmänt bedöma trädslagets odlingsegenskaper. Sitkagranen uppvisar en stor adaptionsförmåga och en hög volymproduktion på en bred skala av marktyper. Trädslaget är en pionjärart som har en snabb ungdomstillväxt och i kombination med mycket vassa barr undkommer viltbetning i större utsträckning en gran. Den faktor som är mest begränsande, när det gäller etablering av sitkagran, är dess relativa frostkänslighet. Denna faktor kan begränsas genom att använda plantmaterial med en väl anpassad proveniens. Enligt genomgången litteratur har sitkagranen i genomsnitt 20-40% högre volymproduktion än gran. I denna studies jämförelse av totalproduktion mellan sitka och gran, växandes med likartad ståndortsförhållande, var sitkagranens totalproduktion i genomsnitt 14% högre än granens. Det ska dock tilläggas att spridningen var stor och om de tre bästa sitkaytorna studeras är totalproduktionen i genomsnitt 30% högre än hos jämförelseytorna med gran. Valet av proveniens är av stor betydelse och vid de tillfälllen då sitkagranens produktion understiger granens finns det belägg för antagandet att sitkagranen representeras av en växtmässigt dåligt anpassad proveniens. Genom att använda prognosinstrument avsedda för gran analyserades möjligheten att skatta framtida utveckling hos sitkabestånd. Det prognosinstrument som användes var ProdMod (Produktionsmodell) (Ekö, 1985) och höjdutvecklingkurvorna för gran enligt Eriksson (1976). Den prognos som visade det bästa resultatet var när ProdMod komplementerades med höjdutvecklingskurvor (Eriksson, 1976) för gran. Slutsatsen är att prognosen underskattar medelproduktionen för sitka med ca 3% vilket ger goda förhoppningar om att kunna skatta sitkagranens utveckling med hjälp av prognosinstrument avsedda för gran. Vid jämförelsen av höjdutveckling mellan sitka och gran uppvisade sitkagranen än mer uthållig höjdutveckling. SLU/Southern Swedish Forest Research Centre 2005 L3 swe eng https://stud.epsilon.slu.se/11638/ |
| spellingShingle | Picea sitchensis sitkagran Picea abies volymproduktion odlingsegenskaper ProdMod Tengberg, Fredrik En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title | En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title_full | En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title_fullStr | En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title_full_unstemmed | En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title_short | En jämförelse av sitkagranens (Picea sitchensis) och den vanliga granens (P. abies) produktion |
| title_sort | en jämförelse av sitkagranens (picea sitchensis) och den vanliga granens (p. abies) produktion |
| topic | Picea sitchensis sitkagran Picea abies volymproduktion odlingsegenskaper ProdMod |