Andersson, Sven
- Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet
Sammanfattning
By means of results from provenance trials in northern Sweden, a map of severity index for various latitudes and altitudes was drawn up. The severity index is defined as the expected percentage plant mortality rate in the local population during the first 20 years after establishment of the plantation. By combining transfer effects based on data from all trials, a general trend of the transfer effect was calculated. The regression obtained showed that, at constant altitude, each degree of transfer southwards meant an increase in survival of 10.8 percentage units; at constant latitude, every 100 metres of downward transfer implied an increase in survival of 3.0 percentage units. By means of a graph combining severity index with transfer effects, it is shown how optimum transfer can be estimated. Optimum transfer is defined as the transfer giving maximum volume yield, which equals 70-80 per cent survival.
Nyckelord
severity index; transfer effects; volume production; Pinus sylvestris; Northern Sweden
Publicerad i
Studia Forestalia Suecica
1980
Utgivare: College of Forestry, Swedish University of Agricultural Sciences
SLU författare
Persson, Anders
- Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet
- Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet
UKÄ forskningsämne
Skogsvetenskap
Publikationens identifierare
- ISBN: 91-38-05858-8
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/125415