Why vegetation increases pine weevil damage: Bridge or shelter?

Petersson, Magnus; Nordlander, Göran; Örlander, Göran

doi:10.1016/j.foreco.2006.01.012

Cited by 22 publications

(22 citation statements)

References 23 publications

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“…The competition posed by vegetation is severe on the more fertile site types, which reduces the possibility of seedlings surviving (Cajander 1949, Yli-Vakkuri et al 1969). In addition, excessive vegetation may provide more shelter for pine weevils, which increases the risk of damage (Petersson et al 2006). Although the time between the harvest and regeneration activities did not prove to be significant in this case, there are clear results of the positive effects of fast regeneration activities and mounding after harvest (Nilsson and Örlander 1999).…”

Section: Discussionmentioning

confidence: 70%

Variation in the results of Norway spruce planting and Scots pine direct seeding in privately-owned forests in southern Finland

Kankaanhuhta¹,

Saksa²,

Smolander³

2009

Silva Fenn.

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This study describes the variation in the planting results for 3-year-old Norway spruce (Picea abies (L.) Karst.) and 4-year-old Scots pine (Pinus sylvestris L.) using direct seeding in privately-owned regeneration areas in southern Finland. The study material consists of operative forest regeneration quality management inventory areas from the years 2000-2006. The effect of both the regional and the administrative levels as well as ecological factors was modelled on the basis of the hierarchy structure forestry centre, Forest Owners' Association (= FOA), forestry professional, regeneration area and sample plot. The major part of the variation occurred at the sample plot and regeneration area level. Particular attention was paid to observation of the clustered spatial distribution of Scots pine seedlings. The FOA and forestry professional levels explained 5% of the variation in Norway spruce planting and 11% of the variation in Scots pine direct seeding. Applied forest regeneration operations, site and soil characteristics were included in the fixed effects. In the planting of Norway spruce the most important factor explaining the regeneration result was soil preparation. Mounding produced better results than patching and disc trenching. The site and soil characteristics were other important factors in the operations. The selection of direct seeding of Scots pine on too fertile, fine textured or moist sites yielded poor results.

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Section: Discussionmentioning

confidence: 70%

Variation in the results of Norway spruce planting and Scots pine direct seeding in privately-owned forests in southern Finland

Kankaanhuhta¹,

Saksa²,

Smolander³

2009

Silva Fenn.

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“…The increase in the amount of ground vegetation in sub-plots without scarification and a weak tendency towards even more vegetation in fertilized plots (900N and 1800N) could be another explanation to the higher level of damage in these treatments. The presence of larger quantities of vegetation increases the likelihood of seedling damage, probably because the vegetation provides shelter for pine weevils (Petersson et al 2006). Also, the composition of the ground vegetation seemed to be different in these treatments with more grass on fertilized plots; however this was only visually observed and not measured in the study.…”

Section: Discussionmentioning

confidence: 81%

Effects of pre-harvest fertilization and subsequent soil scarification on the growth of planted Pinus sylvestris seedlings and ground vegetation after clear-felling

Ring¹,

Högbom²

2013

Silva Fenn.

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Effects of pre-harvest fertilization and subsequent soil scarification on the growth of planted Pinus sylvestris seedlings and ground vegetation after clear-felling Johansson K., Ring E., Högbom L. (2013). Effects of pre-harvest fertilization and subsequent soil scarification on the growth of planted Pinus sylvestris seedlings and ground vegetation after clear-felling. Silva Fennica vol. 47 no. 4 article id 1016. 18 p. Highlights• Pre-harvest N fertilization had no significant effect on seedling growth and ground vegetation biomass.• Scarification improved seedling survival and growth and reduced the amount of ground vegetation.• Without scarification, pre-harvest fertilization increased the amount of damaged seedlings. AbstractFertilization and scarification are both performed to increase tree production at different stages of forest rotation periods. In this study, the effects of previous nitrogen fertilizations and scarification after clear felling on planted Pinus sylvestris L. seedlings and ground vegetation were investigated. Two fertilization experiments established around 1980 were harvested in 2006, after which the plots were scarified by disc trenching and re-planted. The plots had been repeatedly fertilized over a 20-year period before harvesting, with total N doses of 0, 450, 900 or 1800 kg N ha -1 . After five growing seasons, the growth, survival and nutrient contents of the seedlings were measured, and ground vegetation was collected to estimate its biomass and nutrient content. Pre-harvest fertilization alone had only minor effects on the results, but scarification increased both the survival and growth of the planted seedlings. However, without scarification, seedling mortality increased with increasing fertilization intensity. The ground vegetation biomass was higher in plots without scarification, but the total biomass of seedlings and ground vegetation was similar in all treatments. Scarification thus favored seedling growth at the expense of ground vegetation. Only a few effects on nutrient content were found, but there were no signs of nutrient imbalance in any of the treatments. At higher levels of fertilization, the K:N ratio in the seedlings decreased while the K content in the ground vegetation increased. Overall, scarification had a greater impact than pre-harvest fertilization on the planted seedlings and the ground vegetation.

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“…and Microtus spp.) and to decrease damage by the pine weevil Hylobius abietis Petersson et al, 2006;Pitkanen et al, 2005). Site preparation operations which provide even resources around trees for symmetrical development of tree roots may increase stand resistance to strong winds (Coutts et al, 1999), just as drainage and tilling can increase the effective rooting depth (Ni Dhubhain et al, 2001;Ray and Nicoll, 1998).…”

Section: Site Preparationmentioning

confidence: 99%

The influences of forest stand management on biotic and abiotic risks of damage

Jactel

Nicoll

Branco³

et al. 2009

Ann. For. Sci.

232

167

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Abstract• This article synthesizes and reviews the available information on the effects of forestry practices on the occurrence of biotic and abiotic hazards, as well as on stand susceptibility to these damaging agents, concentrating on mammal herbivores, pest insects, pathogenic fungi, wind and fire.• The management operations examined are site selection, site preparation, stand composition, regeneration method, cleaning and weed control, thinning and pruning, and harvesting. For each of these operations we have examined how they influence the occurrence of biotic and abiotic damaging agents, the susceptibility of European forests, and describe the ecological processes that may explain these influences.• Overall, we find that the silvicultural operations that have the largest influence on both biotic and abiotic risks to European forest stands are closely related to species composition and the structure of the overstorey. Four main processes that drive the causal relationships between stand management and susceptibility have been identified: effect on local microclimate, provision of fuel and resources to biotic and abiotic hazards, enhancement of biological control by natural enemies and changes in individual tree physiology and development.• The review demonstrates an opportunity to develop silvicultural methods that achieve forest management objectives at the same time as minimising biotic and abiotic risks. Mots-clés :sylviculture / peuplement / occurrence / sensibilité / Résumé -Influences de la sylviculture sur le risque de dégâts biotiques et abiotiques dans les peuplements forestiers.• Cette revue bibliographique s'intéresse aux effets de la sylviculture sur la sensibilité des peuplements forestiers aux principaux agents de dégâts biotiques et abiotiques que sont les mammifères herbivores, les insectes ravageurs, les champignons pathogènes, le feu et les vents forts. * Corresponding author: herve.jactel@pierroton.inra.frArticle published by EDP Sciences Ann. For. Sci. 66 (2009) 701 H. Jactel et al.• Les pratiques forestières analysées sont la sélection et la préparation des sites de reboisement, la définition de la composition en essences et le choix du matériel génétique, les méthodes de régé-nération et d'entretien, les modalités d'éclaircie et d'élagage, le mode de récolte finale. L'influence de chacune de ces opérations sur l'occurrence des agents de dégâts biotiques et abiotiques et sur la sensibilité des peuplements est examinée ainsi que les processus écologiques sous-jacents.• Les opérations sylvicoles qui se révèlent les plus déterminantes pour la sensibilité des forêts en Europe sont celles qui affectent la composition et la structure de la strate arborée. Quatre principaux processus écologiques semblent expliquer la relation entre sylviculture et sensibilité des peuplements : la modification du micro-climat, l'apport de ressources ou de combustible aux agents de dégâts, l'amélioration du contrôle biologique par les ennemis naturels et l'altération de la physiologie et du développement des arb...

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Why vegetation increases pine weevil damage: Bridge or shelter?

Cited by 22 publications

References 23 publications

Variation in the results of Norway spruce planting and Scots pine direct seeding in privately-owned forests in southern Finland

Variation in the results of Norway spruce planting and Scots pine direct seeding in privately-owned forests in southern Finland

Effects of pre-harvest fertilization and subsequent soil scarification on the growth of planted Pinus sylvestris seedlings and ground vegetation after clear-felling

The influences of forest stand management on biotic and abiotic risks of damage

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