Influence of Forest Fires on the North Swedish Boreal Forest

Zackrisson, Olle

doi:10.2307/3543289

Cited by 696 publications

(527 citation statements)

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“…Fires in savannas are almost periodic surface fires with return times ranging from 1-2 yr in moist areas (Goldammer (1983)) to 5-10 yr in arid areas (Rutherford (1981)). Fires in northern boreal forests are also quite regular, but they prevalently involve crowns (Kasischke et al (1995)) and occur every 50-200yr (Rowe and Scotter (1973);Zackrisson (1977); Engelmark (1984); Payette (1989)). By contrast, in Mediterranean areas, mixed (crown and surface) fires are almost the rule and occur in an apparently random fashion, with highly variable return times (Kruger (1983); Davis and Burrows (1994)).…”

Section: Introductionmentioning

confidence: 99%

A second-order impact model for forest fire regimes

Maggi

Rinaldi

2006

Theoretical Population Biology

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Section: Introductionmentioning

confidence: 99%

A second-order impact model for forest fire regimes

Maggi

Rinaldi

2006

Theoretical Population Biology

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“…about 400 yr BP. This was during the Little Ice Age, when the fire cycle appears to have shortened in general in northern boreal forests in Scandinavia (Kohh, 1975;Zackrisson, 1977;Engelmark et al, 1994). In addition, low summer temperatures prevailed for long periods and were inadequate for reproduction and post-fire reforestation of conifers.…”

Section: Population Development and Disturbance Historymentioning

confidence: 99%

Rise and demise of cold‐climate Picea abies forest in Sweden

Kullman

1996

New Phytologist

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SUMMARYThe study focuses on structural and compositional dynamics of high-elevation (boreal) mixed Picea-Betula forest in the Swedish Scandes. Data from seven years' monitoring of crown condition (defoHation), seed viability, soil and air temperatures, a tree-ring chronology and the age structure of Picea are presented. Real long-term dynamism of the tree cover was inferred from radiocarbon dates of buried subfossil wood. At all time-scales, the forest has responded sensitively to thermal variability. Picea seed viability, demography and radial growth correlated positively with summer temperature. The current Picea population largely results from warming during the first half of the 20th century. However, cooler climate in the past c. five decades has led to reduced population and radial growth as well as accelerating crown defohation. This decline is related primarily to winter soil temperatures. The mechanism of needle loss is deduced to be winter desiccation and resulting cavitation of the xylem. It is hypothesized that previous similar episodes have been balanced by periods of spruce expansion. The successional history leading up to the present stage includes fire disturbance and subsequent coohng during the Little Ice Age, which prolonged and consolidated the early post-fire Betula phase. Pinus was incapable of penetrating these unusually dense birch stands, whereas the shade-intolerant spruce could establish progressively as chmate warmed. This course of structural and compositional dynamism relates to complex interactions of disturbance, chmate change and reproductive responses.

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“…5500 and 2000 BC, with the lowest CHARs between 3500 and 2000 BC. Such fire intervals can be compared to 50-110 years intervals that were common in forests of northern Sweden during the last centuries (Zackrisson, 1977;Granström et al, 1995;Niklasson and Granström, 2000). Long fire intervals are usually characteristic of natural fires, while short fire intervals are often related to human-induced fires (e.g.…”

Section: Natural or Human-induced Fires?mentioning

confidence: 99%

“…The last fire dated by dendrochronology in the Storasjö area occurred AD 1793 and seems to mark the end of a period with high fire frequency (Wäglind, 2004). The sudden change from very frequent fires to complete absence of fires in the 18th-19th centuries is a consequent trend found in Sweden (Zackrisson, 1977;Niklasson and Granström, 2000;Niklasson and Drakenberg, 2001;Niklasson, 2002;Lindbladh et al, 2003). (Digerfeldt, 1988) and mountain glaciers fluctuations (Nesje et al, 2001) are presented as in Hammarlund et al (2003), with the addition of the pollen-based annual temperature reconstruction from Seppä et al (2005).…”

Section: Natural or Human-induced Fires?mentioning

confidence: 99%