Sökning: "Leif Kullman"

Hittade 3 avhandlingar innehållade orden Leif Kullman.

1. 1. Change and stability in the altitude of the birch tree-limit in the southern Swedish Scandes 1915-1975

   Författare :Leif Kullman; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Växtgeografi; Björk; Botanik; Sverige;

   Sammanfattning : .... LÄS MER

3. 2. Treeline dynamics in short and long term perspectives : observational and historical evidence from the southern Swedish Scandes

   Författare :Lisa Öberg; Bengt-Gunnar Jonsson; Leif Kullman; Aage Paus; Mittuniversitetet; []
   Nyckelord :Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; Larix sibirica; climate; Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; Larix sibirica;

   Sammanfattning : Treelines in high-mountain regions are constrained by heat deficiency, although the working mechanisms are still not entirely understood. Observational and paleoecological studies on treeline performance may contribute to increased understanding of the treeline phenomenon in general. LÄS MER

4. 3. Treeline dynamics in short and long term perspectives : observational and historical evidence from the southern Swedish Scandes

   Författare :Lisa Öberg; Bengt-Gunnar Jonsson; Leif Kullman; Ulf Segerström; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Betula pubescens ssp. czerepanovii; Picea abies; Pinus sylvestris; climate change; monitoring; treeline advance; clones; megafossils; immigration; Holocene; cryptic refugia; Swedish Scandes; Terrestrial ecology; Terrestrisk ekologi;

   Sammanfattning : Against the background of past, recent and future climate change, the present thesis addresses elevational shifts of alpine treelines in the Swedish Scandes. By definition, treeline refers to the elevation (m a.s.l. LÄS MER