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Key message <p>Sanitation logging, aimed at mitigating the spread of European spruce bark beetle (<i>Ips typographus</i> L.) outbreaks in boreal stands, was associated with increased decomposition and loss of carbon from the humus layer, measured 10&#xa0;years post-disturbance. We encourage forest managers to take such ecological side-effects into consideration when planning intervention strategies against bark beetle attacks.</p> Context <p>The disturbance due to the European spruce bark beetle (<i>Ips typographus</i> L.)—often managed with sanitation logging—is predicted to increase in European forests, with unclear potential consequences for soil carbon (C).</p> Aims <p>We examined the impact of <i>I. typographus</i> and sanitation logging on organic material&#xa0;decomposition and C content of&#xa0;the humus layer together with the drivers of such changes in boreal stands.</p> Methods <p>Humus-layer C and N concentrations, C stocks, decomposition of Green and Rooibos tea material (labile and more recalcitrant, respectively), and soil temperature were compared between (i)&#xa0;undisturbed sites, (ii) sites disturbed by <i>I. typographus</i>, and (iii)&#xa0;sites sanitized (clear-cut) and replanted due to <i>I. typographus</i> risk). Observations were done circa 10&#xa0;years after the disturbances.</p> Results <p>Humus-layer C and N concentrations and remaining mass of Rooibos tea were lower and C/N ratio and soil temperature were higher at the sanitized sites in comparison to undisturbed sites. A similar, but milder pattern was observed between the&#xa0;sites disturbed by <i>I. typographus</i>&#xa0;(ii) and undisturbed sites(i)i. C concentrations and stocks as well as relative remaining mass of Rooibos tea across plots correlated negatively with soil temperature, and positively with the number of remaining trees.</p> Conclusion <p>Sanitation loggings appeared to increase decomposition and C loss from the humus layer. Such ecological effects should be considered when planning silvicultural interventions to mitigate insect damage.</p>

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Effects of Ips typographus (L.) and sanitation logging disturbance on organic matter decomposition and carbon in the humus layer in boreal Picea abies (L.) H. Karst. stands

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月20日

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  • Maiju Kosunen,
  • Päivi Lyytikäinen-Saarenmaa,
  • Kristiina Karhu

摘要

Key message

Sanitation logging, aimed at mitigating the spread of European spruce bark beetle (Ips typographus L.) outbreaks in boreal stands, was associated with increased decomposition and loss of carbon from the humus layer, measured 10 years post-disturbance. We encourage forest managers to take such ecological side-effects into consideration when planning intervention strategies against bark beetle attacks.

Context

The disturbance due to the European spruce bark beetle (Ips typographus L.)—often managed with sanitation logging—is predicted to increase in European forests, with unclear potential consequences for soil carbon (C).

Aims

We examined the impact of I. typographus and sanitation logging on organic material decomposition and C content of the humus layer together with the drivers of such changes in boreal stands.

Methods

Humus-layer C and N concentrations, C stocks, decomposition of Green and Rooibos tea material (labile and more recalcitrant, respectively), and soil temperature were compared between (i) undisturbed sites, (ii) sites disturbed by I. typographus, and (iii) sites sanitized (clear-cut) and replanted due to I. typographus risk). Observations were done circa 10 years after the disturbances.

Results

Humus-layer C and N concentrations and remaining mass of Rooibos tea were lower and C/N ratio and soil temperature were higher at the sanitized sites in comparison to undisturbed sites. A similar, but milder pattern was observed between the sites disturbed by I. typographus (ii) and undisturbed sites(i)i. C concentrations and stocks as well as relative remaining mass of Rooibos tea across plots correlated negatively with soil temperature, and positively with the number of remaining trees.

Conclusion

Sanitation loggings appeared to increase decomposition and C loss from the humus layer. Such ecological effects should be considered when planning silvicultural interventions to mitigate insect damage.