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Anna-Lena Axelsson
Inst för skoglig resurshushållning
SLU
Hur har Sveriges skogar brunnit historiskt?
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Information om brandhistorik• Skador i döda och levande träd
• Dokument och kartor
• Pollenanalys
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Zackrisson 1977
Influence of Forest Fires on the North Swedish
Boreal Forest
• Innan brandbekämpning
– Skogsbrand vart 80:e år
• Senaste skogsbrand
– I genomsnitt 155 år sedan (200 år)
• Variation i brandfrekvens mellan skogstyper
– Inspiration till ASIO-modellen
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Västerbotten, Fredrika• 19 x 32 km
• Två olika tidsperioder om 50 år
Niklasson & Granström (2000)
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1499-1548 Få stora bränder
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1799-1848 Flera mindre bränder
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Svedjebruk
Bränning för att förbättra betet
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Stora sammanhängade bränder
• Fredrika 1514 >200 km2
• Västmanland 2014 138 km
Källa: Anders Granström
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1899-1948 Väldigt få små bränder?
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Björnlandet
Norra Kvill
40 enskilda bränder 1401-1770
Brandfrekvens vart 20 år
Tyresta
Bränder fram till 1600-talet
Brandfrekvens vart 30-40:e
Tiveden
Mats Niklasson
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Lycksele district
Former state-owned forest
Andel bränd mark av statens mark, Lycksele kommun
Domänverket
Källa: Jägmästarnas årsberättelser, Kungliga Domänstyrelsen, Årsrapporter, Domänverket
Hyggesbränning
Skogsbrand
1901
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1880 1900 1920 1940 1960 1980
Hyggesbränning
Naturlig skogsbrand
18881 %
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Naturvårdsbränning
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Bränd mark 1866-1874
Avvittringshandlingar,
Lycksele socken
(Axelsson 2001)
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Likartad utveckling i USA
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1650 1700 1750 1800 1850 1900 1950 2000
Samisk renskötsel
Jordbrukskolonisation
Förindustriellt skogsutnyttjande
Industriellt skogsutnyttjande
Incitament för att bekämpa skogsbränder
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• Extremt effektiv brandbekämpning
• Förutsättningar
– Handredskap
– Avsaknad av brandflyg
– Lokal organisation, folk på plats
– Skogsbrandförsvaret separerat från Bygdebrandförsvaret
• Kan vi lära oss något av historien?
Historiskt perspektiv på bekämpning av skogsbränder
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