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131.
Rjavenje borovih iglic - primer ukrepanja v Soški dolini
Marija Kolšek, Zoran Zavrtanik, 2020

Povzetek: Gozdarski inštitut Slovenije je v letih 2015 do 2018 na več lokacijah v Soški dolini potrdil prisotnost glive Lecanosticta acicola, ki povzroča bolezen rjavenje borovih iglic, tudi na črnem boru (Pinus nigra), kar je glede na dosedanje raziskave te glive v Evropi redkost. Glede na rezultate raziskav in opažanja na terenu je populacija glive na črnem boru najverjetneje zelo patogena in bi lahko ogrozila naravne sestoje črnega bora v Sloveniji. V primerjavi z drugimi populacijami te glive v Sloveniji sklepamo, da je zaenkrat geografsko izolirana populacija glive na črnem boru. Zato je bila leta 2018 sprejeta odločitev, da se v Zgornjem Posočju izvedejo ukrepi za omejevanje širjenja glive. Pred decembrom 2019 je bila gliva uvrščena na seznam II.A.I Direktive Sveta 2000/29/ ES kot Scirrhia acicola. Z novo zakonodajo EU s področja zdravstvenega varstva rastlin je gliva L. acicola uvrščena na sezname nadzorovanih nekarantenskih škodljivih organizmov. Uprava za varno hrano, veterinarstvo in varstvo rastlin (UVHVVR), Gozdarski inštitut Slovenije in Zavod za gozdove Slovenije so pripravili načrt ukrepanja, ki ga je potrdil direktor UVHVVR. Ukrepanje v gozdnem prostoru je potekalo konec leta 2019 in v prvi polovici leta 2020.
Ključne besede: Lecanosticta acicola, rjavenje borovih iglic, Soška dolina, Pinus nigra, črni bor, ukrepanje, gozdovi
DiRROS - Objavljeno: 14.11.2020; Ogledov: 130; Prenosov: 41
.pdf Celotno besedilo (551,12 KB)

132.
The effect of bedrock and species mixture on wood density and radial wood increment in pubescent oak and black pine
Jožica Gričar, Polona Hafner, Luka Krajnc, 2020

Povzetek: Wood density and radial wood increment were examined in trees of pubescent oak (Quercus pubescens Willd.) and black pine (Pinus nigra Arnold., subsp. nigra) in relation to stand mixture and underlying bedrock. Trees of both species from pure and mixed stands were sampled across two types of bedrock, limestone and flysch. Trees from each species were similar in age. Wood density was estimated in standing trees using resistance drilling and increment cores were taken from a smaller subsample of trees of both species. Tree-ring, earlywood and latewood widths were measured and compared to radial profiles of wood density. The influence of stand mixture, diameter at breast height and bedrock on wood density was examined using a Bayesian general linear model. Wood density was significantly higher in pubescent oak than in black pine. Stand mixture was found to affect wood density positively, although the magnitude of the effect was relatively small when compared to other influencing factors also included in the current study. The effect of diameter on wood density was positive on both bedrocks in pubescent oak and negative or neutral in black pine. The size of the effect varied by bedrock and species. On flysch bedrock, the influence of diameter on wood density was stronger than it was on limestone. These indirect bedrock effects on wood density are probably a result of different soil fertility rather than the bedrock itself. There was a notable difference in radial wood increment in both species across the two bedrocks, whereas the differences in densities were smaller. Higher wood densities found on flysch in the subsample of pubescent oaks are likely an effect of higher proportions of latewood, while the opposite trend was observed in black pine. Higher wood density was found on limestone in black pine despite higher latewood percentages on flysch. In the context of forest management, the species composition of the naturally occurring mixtures in the sub-Mediterranean region should be adjusted slightly to favor pubescent oak, since it is a climax species and will bind more carbon for longer than black pine due to higher wood densities. Future forest management should also promote the overall development of pubescent oak trees in sub-Mediterranean stands. The results are especially important in the European context, because the share of sub-Mediterranean stands is expected to rise with global warming.
Ključne besede: Karst, wood structure, resistograph, resistance drilling, Quercus pubescens, Pinus nigra, limestone, flysch
DiRROS - Objavljeno: 14.01.2021; Ogledov: 16; Prenosov: 0
.pdf Celotno besedilo (1,42 MB)

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