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Query: "keywords" (Abies sp.) .

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61.
Estimating the most effective and economical pheromone for monitoring the European spruce bark beetle
Nina Šramel, Andreja Kavčič, Marija Kolšek, Maarten De Groot, 2021, original scientific article

Abstract: In recent decades, there have been an increasing number of outbreaks of Ips typographus in Europe. A large amount of sanitary felling has taken place, with significant economic and ecological consequences. In order to anticipate such large%scale outbreaks, an effective monitoring system should be set up. One important aspect of monitoring is deciding which pheromone to use. Therefore, we decided to test five different commercially available pheromone lures under different disturbance conditions: Pheroprax%, IT Ecolure Extra%, Ipstyp%, Ipsowit% and Typosan%. We investigated the ability of the pheromones to distinguish between disturbed and undisturbed locations, their cost%efficiency ratio, and side effects such as bycatch abundance and composition. We set 50 traps in two areas with sites that were disturbed and undisturbed by windstorms. We collected the catch from traps every 1%2 weeks from the end of March until the end of September in 2019. We found that IT Ecolure Extra%, Ipsowit% and % Pheroprax% caught the most I. typographus and best showed changes in the trap catch of I. typographus throughout the whole season. There was a low amount of bycatch (<6% of the total catch) and a low number of predators (a few specimens), but some groups seem to prefer certain pheromones. The cost of the pheromones increased with their effectiveness. However, pheromone costs are low relative to the personnel costs involved in setting traps and collecting the catch. Based on all of the gathered data, we created an index which helps to assess the cost%efficiency of the five chosen commercially available pheromones. We also present guidelines on how to make such an index to assist other researchers in choosing the right pheromone for monitoring populations of I. typographus or other bark beetle species.
Keywords: bark beetles, cost-efficiency, Ips typographus, monitoring pheromones, Picea abies
Published in DiRROS: 21.01.2021; Views: 1380; Downloads: 746
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62.
The effect of crown social class on bark thickness and sapwood moisture content in Norway spruce
Luka Krajnc, Jožica Gričar, 2020, original scientific article

Abstract: The research study examined the effect of tree properties (crown social class, diameter at breast height (DBH), and tree height) on bark thickness (BT) and sapwood moisture content (SMC) in Norway spruce (Picea abies (L.) H. Karst.). Both examined variables were shown to be positively affected by DBH and tree height. The relationship between DBH and SMC varied among crown social classes, while the relationship between DBH and BT was relatively constant across crown social classes. Crown social class had a relatively small effect on BT and SMC, having a more pronounced effect on SMC than on BT. The relationship between tree height and BT did not vary across crown social classes, while the relationship between SMC and tree height was found to change slightly across crown social classes. Measurements of BT and SMC in the field are affordable, fast, and easy to use. Both variables could potentially be used to improve predictions of bark beetle attacks, as they reflect the physiological state of an individual tree.
Keywords: Picea abies, tree diameter, tree height, crown social class, phloem, sapwood
Published in DiRROS: 14.01.2021; Views: 1192; Downloads: 1020
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63.
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Pregled jelovih rastišč v Sloveniji
Igor Dakskobler, Aleksander Marinšek, 2009, review article

Abstract: Članek vsebuje pregled jelovih rastišč na ozemlju Slovenije. Našteli in kratko opisali smo deset jelovih (bukovo-jelovih, smrekovo-jelovih) združb. Nekatere uspevajo na svežih do vlažnih, nevtrofilnih ali acidofilnih rastiščih podgorskega in gorskega pasu (Galio-Abietetum, Bazzanio-Abietetum, Polysticho setiferi-Abietetum), druge na zelo skalnatih karbonatnih ali silikatnih rastiščih z inicialnimi tlemi (npr. Ribeso alpini-Piceetum, Neckero-Abietetum, Calamagrostio-Abietetum, Paraleucobryo-Abietetum). Jelka ima pomembno ekološko, biotopsko in gospodarsko vlogo v nekaterih bukovih (jelovo-bukovih) združbah (npr. Omphalodo-Fagetum, Homogyno sylvestris-Fagetum, Anemono-Fagetum). Uspeva v večini smrekovih združb, v macesnovju (Rhodothamno-Laricetum) in alpskem ruševju (Rhododendro hirsuti-Pinetum prostratae = Rhodothamno-Rhododendretum hirusti).
Keywords: gozdne združbe, bela jelka, Abies alba, jelovi gozdovi, fitocenologija, sintaksonomija, Slovenija
Published in DiRROS: 17.11.2020; Views: 1408; Downloads: 401
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67.
Smrekov lubadar močno uničuje gozdove na zgornjem Gorenjskem
Vida Papler-Lampe, 2008, professional article

Keywords: smreka, Picea abies, podlubniki, Gornjska, bolezni drevja, gozdovi, varstvo gozdov
Published in DiRROS: 29.07.2020; Views: 1465; Downloads: 687
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68.
Veverice so pogrizle smrekove brste in naredile preprogo iz smrekovih vejic na Pohorju v zimi 2008/09
Nikica Ogris, Nenad Zagorac, 2009, professional article

Keywords: smreka, Picea abies, veverice, brsti, škoda, Pohorje, gozdovi, varstvo gozdov
Published in DiRROS: 29.07.2020; Views: 1438; Downloads: 712
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69.
Osip smrekovih iglic, Lirula macrospora
Tine Hauptman, Marijan Denša, 2009, professional article

Keywords: smreka, Picea abies, Lirula macrospora, iglice, bolezni drevja, gozdovi, varstvo gozdov
Published in DiRROS: 29.07.2020; Views: 1433; Downloads: 764
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70.
Zapredkarice (Cephalcia spp.) na vejah navadne smreke na Koroškem pri Prevaljah
Maja Jurc, Gorazd Mlinšek, 2009, professional article

Keywords: zapredkarice, smreka, Picea abies, Cephalcia spp., bolezni drevja, gozdovi, varstvo gozdov
Published in DiRROS: 29.07.2020; Views: 1490; Downloads: 773
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