51. Veverice so pogrizle smrekove brste in naredile preprogo iz smrekovih vejic na Pohorju v zimi 2008/09Nikica Ogris, Nenad Zagorac, 2009 Ključne besede: smreka, Picea abies, veverice, brsti, škoda, Pohorje, gozdovi, varstvo gozdov
DiRROS - Objavljeno: 29.07.2020; Ogledov: 942; Prenosov: 474
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53. Poročilo o preskusu št.: LVG 2020-030 : opis vzorca: Picea abies, cela rastlina : namen testiranja: sum na: sušaNikica Ogris, 2020 Ključne besede: varstvo gozdov, morfološke analize, navadna smreka, Picea abies, fiziološka suša, sušni stres, manipulacija sadik, sadika, fakultativen parazit, endofit
DiRROS - Objavljeno: 26.05.2020; Ogledov: 1056; Prenosov: 0 |
54. Namnožitev osmerozobega in šesterozobega smrekovega lubadarja v Sloveniji v 2020Nikica Ogris, Marija Kolšek, 2020 Ključne besede: Ips typographus, Pityogenes chalcographus, namnožitev, navadna smreka, Picea abies, osmerozobi smrekov lubadar, šesterozobi smrekov lubadar, lokacija, populacija, gostota, model, RITY-2, CHAPY-1
DiRROS - Objavljeno: 30.07.2020; Ogledov: 1000; Prenosov: 490
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55. Transition dates from earlywood to latewood and early phloem to late phloem in Norway SpruceJožica Gričar, Katarina Čufar, Klemen Eler, Vladimir Gryc, Hanuš Vavrčík, Martin De Luis, Peter Prislan, 2021 Povzetek: Climate change will affect radial growth patterns of trees, which will result in different forest productivity, wood properties, and timber quality. While many studies have been published on xylem phenology and anatomy lately, little is known about the phenology of earlywood and latewood formation, also in relation to cambial phenology. Even less information is available for phloem. Here, we examined year%to%year variability of the transition dates from earlywood to latewood and from early phloem to late phloem in Norway spruce (Picea abies) from three temperate sites, two in Slovenia and one in the Czech Republic. Data on xylem and phloem formation were collected during 2009%2011. Sensitivity analysis was performed to determine the specific contribution of growth rate and duration on wood and phloem production, separately for early and late formed parts. We found significant differences in the transition date from earlywood to latewood between the selected sites, but not between growth seasons in trees from the same site. It occurred in the first week of July at PAN and MEN and more than two weeks later at RAJ. The duration of earlywood formation was longer than that of latewood formation; from 31.4 days at PAN to 61.3 days at RAJ. In phloem, we found differences in transition date from early phloem to late phloem also between the analysed growth seasons; from 2.5 weeks at PAN to 4 weeks at RAJ Compared to the transition from earlywood to latewood the transition from early phloem to late phloem occurred 25%64 days earlier. There was no significant relationship between the onset of cambial cell production and the transition dates. The findings are important to better understand the inter%annual variability of these phenological events in spruce from three contrasting temperate sites, and how it is reflected in xylem and phloem anatomy.
Ključne besede: Picea abies, xylem formation, phloem formation, cambium, tracheid, sieve cell, conifer, temperate environment
DiRROS - Objavljeno: 22.03.2021; Ogledov: 499; Prenosov: 363
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56. Predlogi postopkov za določitev optimalnega števila in lokacij kontrolnih pasti, kontrolnih nastav in lovnih nastav za osmerozobega smrekovega lubadarja (Ips typographus)Nikica Ogris, Marija Kolšek, Maarten De Groot, 2020 Ključne besede: kontrolna past, kontrolna nastava, lovna nastava, optimizacija, protokol, osmerozobi smrekov lubadar, Ips typographus, smreka, Picea abies, spremljanje, monitoring
DiRROS - Objavljeno: 14.01.2021; Ogledov: 560; Prenosov: 415
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57. Preverjanje kratkoročnih napovedi sanitarnega poseka smreke in jelke zaradi podlubnikov v Sloveniji v 2020Nikica Ogris, Maarten De Groot, 2020 Ključne besede: navadna smreka, Picea abies, bela jelka, Abies alba, sanitarni posek, napovedi, ogroženost, modeli, validacija, zmogljivost, zanesljivost, točnost, natančnost, AUC, občutljivost, specifičnost
DiRROS - Objavljeno: 14.01.2021; Ogledov: 588; Prenosov: 575
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58. The effect of crown social class on bark thickness and sapwood moisture content in Norway spruceLuka Krajnc, Jožica Gričar, 2020 Povzetek: 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.
Ključne besede: Picea abies, tree diameter, tree height, crown social class, phloem, sapwood
DiRROS - Objavljeno: 14.01.2021; Ogledov: 694; Prenosov: 640
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59. Predlog števila in lokacij kontrolnih-lovnih pasti in kontrolno-lovnih nastav v 2021Nikica Ogris, Marija Kolšek, Maarten De Groot, 2021 Ključne besede: kontrolno-lovna past, kontrolno-lovna nastava, optimizacija, protokoli, osmerozobi smrekov lubadar, Ips typographus, smreka, Picea abies, spremljanje, monitoring
DiRROS - Objavljeno: 04.02.2021; Ogledov: 671; Prenosov: 502
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