Wild fire area at lake Norra Hörken
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Autumn one year after (21 September 2007)
The same woodsample now prepared and measured. It contained growth rings from 1910 to the summer 2006. The outermost ring shows that this spruce was killed by the fire sometime at midsummer, or not too long after, 2006. While the core was taken at breast height and the pitch was not hit, the tree was at least 100 years old when died. So this dates the fire to high-summer 2006 and the forest than was around 100 years. (Measurements available in the image description file)
At the downwind side of the tree the temperature become so high that the cambium does not survive. This will invite some insects causing the bark falling of, and leaving a scar. If enough bark will remain alive the tree will survive and a fire scar will be possible to see for hundreds of years (if the tree is not cut down before that).
Autumn two years after (11 September 2008)
Early summer four years after (7 June 2010)
Unknown fungus in a Picea abies(?) stump.
Prepared wood sample of wild fire damaged Pinus sylvestris. Growth rings from 1914-2009 (and the very beginning of 2010 years early wood). The pine was cored from bark to bark with a Haglöf's 5 mm*400 mm increment borer. The pine was damaged by the fire in high summer (midsummer or early? July) 2006. One side died, but the other one is still alive. In the dead side the sap wood is affected by blue stain. The the heavily increasing growth rate already from late summer 2004 (late wood but not early wood that year), indicates that the trees around were cut at least two years before the fire. The growth rate in the healthy side of the tree seem not being very much affected by the fire event. The pith was missed with about 10 mm or 1-4 rings.