Drivers of snag fall rates in Fennoscandian boreal forests

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Drivers of snag fall rates in Fennoscandian boreal forests

Aakala, Tuomas (author): Univ Eastern Finland, Sch Forest Sci, Joensuu, Finland.

Storaunet, Ken Olaf (author): Norwegian Inst Bioecon Res, As, Norway.

Jonsson, Bengt-Gunnar, 1963- (author): Mittuniversitetet,Institutionen för naturvetenskap, design och hållbar utveckling (2023-)

Korhonen, Kari T. (author): Nat Resources Inst Finland, Joensuu, Finland.

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Univ Eastern Finland, Sch Forest Sci, Joensuu, Finland Norwegian Inst Bioecon Res, As, Norway. (creator_code:org_t)

2024
2024
English.
In: Journal of Applied Ecology. - : Wiley. - 0021-8901 .- 1365-2664.

Related links:: https://doi.org/10.1...; show more...; https://miun.diva-po... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Persistence of standing dead trees (snags) is an important determinant for their role for biodiversity and dead wood associated carbon fluxes. How fast snags fall varies widely among species and regions and is further influenced by a variety of stand- and tree-level factors. However, our understanding of this variation is fragmentary at best, partly due to lack of empirical data. Here, we took advantage of the accruing time series of snag observations in the Finnish, Norwegian and Swedish National Forest Inventories that have been followed in these programs since the mid-1990s. We first harmonized observations from slightly different inventory protocols and then, using this harmonized dataset of ca. 43,000 observations that had a consistent 5-year census interval, we modelled the probability of snags of the main boreal tree species Pinus sylvestris, Picea abies and Betula spp. falling, as a function of tree- and stand-level variables, using Bayesian logistic regression modelling. The models were moderately good at predicting snags remaining standing or falling, with a correct classification rate ranging from 68% to 75% among species. In general, snag persistence increased with tree size and climatic wetness, and decreased with temperature sum, advancing stage of decay, site productivity and disturbance intensity (mainly harvesting). Synthesis and applications: The effect of harvesting demonstrates that an efficient avenue to increase the amount of snags in managed forests is protecting them during silvicultural operations. In the warmer future, negative relationship between snag persistence and temperature suggests decreasing the time snags remain standing and hence decreasing habitat availability for associated species. As decomposition rates generally increase after fall, decreasing snag persistence also implies substantially faster release of carbon from dead wood. The effect of harvesting demonstrates that an efficient avenue to increase the amount of snags in managed forests is protecting them during silvicultural operations. In the warmer future, negative relationship between snag persistence and temperature suggests decreasing the time snags remain standing and hence decreasing habitat availability for associated species. As decomposition rates generally increase after fall, decreasing snag persistence also implies substantially faster release of carbon from dead wood.image

Subject headings

LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)

Keyword

boreal forest
coarse woody debris
Fennoscandia
forest management
standing dead tree

Publication and Content Type

ref (subject category)
art (subject category)

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By the author/editor: Aakala, Tuomas; Storaunet, Ken O ...; Jonsson, Bengt-G ...; Korhonen, Kari T ...

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AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Forest Science

Articles in the publication: Journal of Appli ...

By the university: Mid Sweden University

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