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When tree diversity does not work [Elektronski vir] : the interacting effects of tree diversity, altitude and amount of spruce on European spruce bark beetle outbreaksDe Groot, Maarten, entomolog ...The frequency of large-scale insect outbreaks is expected to increase with climate change, and the European spruce bark beetle (Ips typographus) is a major forest pest in Europe that has caused more ... extensive and widespread outbreaks in recent years. It is therefore important to evaluate forest management strategies for controlling bark beetle populations. While tree species diversity is often promoted as a way to improve forest resistance to specialist insects, the relationship between tree species diversity and bark beetle outbreaks is not well understood, partly due to the complex interactions with other factors. The aim of this study was to assess the impact of tree species diversity on European spruce bark beetle outbreaks, while controlling for host availability across different altitudes. We analysed data from a systematic 1 × 1 km grid in Slovenia. For each grid cell, we extracted data on the sanitary felling of Norway spruce that followed bark beetle outbreaks from a national data base covering the period 1996–2017. Additionally, we extracted data on resource availability (i.e., the percentage of Norway spruce in the grid cell), non-host tree species diversity and average altitude. We analysed the effect of altitude, forest cover, percentage of spruce and non-host tree species diversity during outbreak and non-outbreak periods on the probability of sanitary felling and on the amount of sanitary felling, separately. The probability of sanitary felling was higher at low altitudes and increased with an increasing proportion of spruce in the growing stock in the grid cell, but it was not affected by non-host tree species diversity. In contrast, the amount of sanitary felling decreased with increasing non-host tree species diversity, particularly at low altitudes. However, the effect of non-host tree species diversity on the amount of sanitary felling diminished as the percentage of Norway spruce increased. Thus, non-host tree species diversity per se is not the main driver of outbreak risk but strengthens biotic resistance with lower host availability at low altitudes where abiotic conditions are the least favourable to Norway spruce.Source: Forest Ecology and Management [Elektronski vir]. - ISSN 1872-7042 (Vol. 537, article no. 120952, 2023, 8 str.)Type of material - e-articlePublish date - 2023Language - englishCOBISS.SI-ID - 147153667
Author
De Groot, Maarten, entomolog |
Ogris, Nikica |
Diaci, Jurij |
Castagneyrol, Bastien
Topics
biotska odpornost |
izbruhi podlubnikov |
drevesne vrste |
odpornost |
zatiranje gozdnih škodljivcev |
biotic resistance |
bottom-up resistance |
Bark beetle outbreaks |
tree species diversity |
forest pest management
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Database name | Field | Year |
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De Groot, Maarten, entomolog | 29092 |
Ogris, Nikica | 23448 |
Diaci, Jurij | 11253 |
Castagneyrol, Bastien | ![]() |
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