Sökning: "tree-ring width"

Visar resultat 1 - 5 av 14 uppsatser innehållade orden tree-ring width.

1. 1. Effekten av Årsringsbredd, Sommarvedsandel, Svällning och Växtplats på Utvalda Mekaniska Egenskaper av Contorta (Pinus Contorta)

   Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Författare :Carl Holmquist; [2023]
   Nyckelord :lodgepole pine; latewood; latewood ratio; year ring; growth ring; growth ring width; swelling; bending strength; Contorta; sommarved; sommarvedsandel; årsring; årsringsbredd; medelårsringsbredd; svällning; korrelation; växtplats; hållfasthet; böjhållfasthet; e-modul; elasticitet; densitet;

   Sammanfattning : I dagsläget finns ca 600 000 ha Contortaskog i Sverige varav en stor del planterades runt 70- till 80-talet. Contorta har sitt ursprung i västra USA och Kanada och introducerades i Sverige som en lösning på en förutspådd fibersvacka. LÄS MER

3. 2. Effect of tree age on masting signal in tree-ring chronologies of beech in southern Sweden

   Master-uppsats, SLU/Southern Swedish Forest Research Centre

   Författare :Jeppe Van Der Lee; [2023]
   Nyckelord :beech; masting; masting signal; proxy; tree-ring chronologies; age; dominance; social position; southern Sweden; climate change; tree growth; regeneration success;

   Sammanfattning : Masting is a synchronous and highly variable production of seeds in tree species. Masting may reflect a reproduction strategy to cope with seed predation. In beech, temperature is the cue controlling annual variability in seeding. Masting behaviour in beech typically begins around the age of 40 years. LÄS MER

4. 3. POSSIBLE TIMING OF THE TRANSITION FROM PRE-INDUSTRIAL TO INDUSTRIAL CLIMATE IN THE CENTRAL TO NORTHERN OF SWEDEN, BASED ON PROXY DATA FROM TREE-RINGS

   Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

   Författare :Mika Falkensjö Oppenheim; [2022-09-28]
   Nyckelord :Tree-ring; maximum latewood density MXD ; Scandinavia; pre-industrial; industrial climate;

   Sammanfattning : Earth’s climate has varied through time, with orbital forcing as the most dominant force on the climate system the last million years, causing glacial-interglacial cycles. The last glacial period ended about 11.6 thousand years (kyr), ago and the last interglacial maximum around 6.5 kyr ago. LÄS MER

5. 4. CLIMATE CHANGE AND THE NORWAY SPRUCE TREELINE IN THE CENTRAL SCANDINAVIAN MOUNTAINS Treeline evolution, tree growth and a Blue Intensity summer temperature reconstruction

   Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

   Författare :Fredrik Karlsson; [2022-09-01]
   Nyckelord :Treeline evolution; Tree growth; Norway spruce; central Scandinavian mountains; Blue Intensity;

   Sammanfattning : In the context of global change, mountain regions have received increased interest in recent times with researchers trying to answer how such regions may be affected by a changing climate. Treeline environments are sensitive to the impacts of climate change which may significantly alter the characteristics of the regions. LÄS MER

7. 5. Elemental variability in tree-rings as indicator for climate change : a case study on beech and oak trees at the Laacher See, Germany

   Master-uppsats, Stockholms universitet/Institutionen för naturgeografi

   Författare :Ann-Kathrin Wild; [2022]
   Nyckelord :trace elements; tree-rings; dendrochemistry; dendroclimatology; ITRAX; Laacher See; mofettes; tree-bark; Quercus sp.; Fagus sp.;

   Sammanfattning : The aim of this study was to contribute to the comprehension of the connection of element uptake in trees at the Laacher See in Germany and climatic parameters on different time scales. Understanding the relationship of certain elements in trees and temperature might enable the assignment of extraordinary high peaks in the elemental concentration, which cannot be explained by temperature, to another process as CO2 degassing of the mofettes, which are relics of the volcanic past of the lake. LÄS MER