131. Discrimination between abiotic and biotic drought stress in tomatoes using hyperspectral imagingNik Susič, Uroš Žibrat, Saša Širca, Polona Strajnar, Jaka Razinger, Matej Knapič, Andrej Vončina, Gregor Urek, Barbara Gerič Stare, original scientific article Abstract: Crop plants are subjected to various biotic and abiotic stresses. Both root-knot nematodes (biotic stress) and water deficiency (abiotic stress) lead to similar drought symptoms in the plant canopy. In this work, hyperspectral imaging was used for early detection of nematode infestation and water deficiency (drought) stress in tomato plants. Hyperspectral data in the range from 400 to 2500 nm of plants subjected to different watering regimes and nematode infestation levels were analysed by partial least squares – discriminant analysis (PLS-DA) and partial least squares – support vector machine (PLS-SVM) classification. PLS-SVM classification achieved up to 100% accuracy differentiating between well-watered and water-deficient plants, and between 90 and 100% when identifying nematode-infested plants. Grouping the data according to the time of imaging increased the accuracy of classification. Shortwave infrared spectral regions associated with the OH and CH stretches were most relevant for the identification of nematode infested plants and severity of infestation. This study demonstrates the capability of hyperspectral imaging to identify and discriminate between biotic and abiotic plant stresses.
Keywords: nematode, Hyperspectral imaging, Drought stress, Root-knot nematode, Tomato
Published in DiRROS: 20.07.2018; Views: 3977; Downloads: 2445
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132. Poročilo o spremljanju stanja gozdov za leto 2017 : vsebinsko poročilo o spremljanju stanja gozdov v l. 2017 v skladu s Pravilnikom o varstvu gozdov (2009)Mitja Ferlan, Andrej Grah, Lado Kutnar, Nikica Ogris, Špela Planinšek, Matej Rupel, Primož Simončič, Iztok Sinjur, Mitja Skudnik, Daniel Žlindra, Jure Žlogar, 2018, final research report Keywords: varstvo gozdov, monitoring, meteorologija, letni prirastek, poročila
Published in DiRROS: 04.07.2018; Views: 3191; Downloads: 1034
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133. Projekt LIFE DINALP BEAR za celovito upravljanje in varstvo rjavega medveda v severnih Dinaridih in AlpahNives Pagon, Samar Al Sayegh-Petkovšek, Matej Bartol, Tomaž Berce, Sonia Calderola, Rok Černe, Urša Fležar, Claudio Groff, Đuro Huber, Ida Jelenko Turinek, Klemen Jerina, Marko Jonozovič, Irena Kavčič, Felix Knauer, Miha Krofel, Bojana Lavrič, Aleksandra Majić Skrbinšek, Miha Marenče, Urška Marinko, Anja Molinari-Jobin, Boštjan Pokorny, Hubert Potočnik, Slaven Reljic, Tomaž Skrbinšek, Matija Stergar, Bojan Vivoda, 2018, popular article Keywords: rjavi medved, gospodarjenje z divjadjo, LIFE DINALP BEAR, Dinaridi, Alpe
Published in DiRROS: 20.06.2018; Views: 4978; Downloads: 880
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134. Priporočila za obravnavo bolnikov z rakom debelega črevesa in dankeVaneja Velenik, Irena Oblak, Erik Brecelj, Janja Ocvirk, Ibrahim Edhemović, Ana Jeromen, Franc Anderluh, Mirko Omejc, Stojan Potrč, Borut Štabuc, Maja Marolt-Mušič, Peter Popović, Martina Reberšek, Vesna Zadnik, Jasna But-Hadžić, Blaž Trotovšek, Mateja Krajc, Maja Ebert Moltara, Jernej Benedik, Neva Volk, Rok Petrič, Matej Bračko, Snježana Frković-Grazio, Nada Rotovnik-Kozjek, 2017, professional article Keywords: sistemsko zdravljenje, rak debelega črevesa, rak danke, slikovna diagnostika, kirurgija, obsevanje
Published in DiRROS: 16.03.2018; Views: 4352; Downloads: 1122
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135. Poročilo o spremljanju stanja gozdov za leto 2016 : vsebinsko poročilo o spremljanju stanja gozdov v l. 2016 v skladu s Pravilnikom o varstvu gozdov (2009)Mitja Ferlan, Andrej Grah, Jernej Jevšenak, Tom Levanič, Nikica Ogris, Špela Planinšek, Matej Rupel, Primož Simončič, Iztok Sinjur, Mitja Skudnik, Saša Vochl, Daniel Žlindra, Jure Žlogar, 2017, final research report Keywords: varstvo gozdov, monitoring, meteorologija, letni prirastek, poročila
Published in DiRROS: 03.10.2017; Views: 3282; Downloads: 1090
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138. Structure, development and growth of selection forests at the Granata research siteMatej Reščič, Andrej Bončina, 2007, original scientific article Abstract: The Granata research site was established for the study of structure, growth and regeneration of silver fir-European beech single stem selection forest. Three phytocoenological relevés were carried out, all trees ?5 cm diameter at breast height (d.b.h.) were measured by full callipering, tree growth was analysed for sample trees, regeneration of tree species was registered on 63 sampling plots. In addition, historical data from past forest inventories werestudied. In the period from 1952 to 2003, the share of silver fir has decreased from 86% to 26%, the share of Norway spruce increased significantly,whereas the share of beech and sycamore has slightly increased. The current growing stock amounts to 350 m3 ha-1, with large-size diameter trees (d.b.h. ?50 cm) representing 51% of total growing stock. The site is divided into 16 stand patches with significant differences in tree species composition and diameter distribution. Regeneration is sufficient with silver fir prevailing in total number of seedlings (42%). 23% of all seedlings are damaged as a result of game browsing.
Keywords: selection forest, plenterwald, selection system management, stand structure, tree species composition, regeneration, diameter distribution
Published in DiRROS: 12.07.2017; Views: 4867; Downloads: 2067
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139. Vpliv temperature termične obdelave na dielektrične lastnosti lesaMatej Jošt, Jože Resnik, Milan Šernek, 2004, original scientific article Abstract: V prispevku so predstavljeni rezultati vpliva temperature termične obdelave nadielektrične lastnosti bukovine (Fagus sylvatica L.) in smrekovine (Picea abies L.). V eksperimentu smo uporabili diskaste preskušance premera 45 mm in debeline 5 mm, ki smo jih termično obdelali pri sedmih različnih temperaturah (50 do 200 °C). Dielektrične lastnosti preskušancev smo ugotavljali pri devetih različnih frekvencah (2 do 10 MHz). Vse meritve smo opravili pri sobnitemperaturi z impedančnim analizatorjem HP 4191A RF po metodi z mikrometrom, na katerega sta bili pritrjeni diskasti aluminijasti elektrodi. Na osnovi dobljenih rezultatov smo ugotovili, da se dielektrična vrednost lesain izgubni kot zmanjšujeta z naraščajočo temperaturo obdelave, če je le-tavišja od 100 °C. Dielektrična vrednost lesa je nižja pri večji izgubi mase preskušanca.
Keywords: dielektrične lastnosti, temperatura, segrevanje, les, visoka frekvenca
Published in DiRROS: 12.07.2017; Views: 4472; Downloads: 1945
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140. Poročilo o spremljanju stanja gozdov za leto 2014 : vsebinsko poročilo o spremljanju stanja gozdov v l. 2014 v skladu s pravilnikom o varstvu gozdov (2009)Primož Simončič, Marko Kovač, Matjaž Čater, Tom Levanič, Lado Kutnar, Nikica Ogris, Matej Rupel, Iztok Sinjur, Mitja Skudnik, Urša Vilhar, Daniel Žlindra, 2015, final research report Keywords: varstvo gozdov, monitoring, osutost, prirastek, poročilo
Published in DiRROS: 12.07.2017; Views: 3029; Downloads: 832
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