1721 research outputs found
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Old World Megadroughts and Pluvials During the Common Era
No full textClimate model projections suggest widespread drying in the Mediterranean Basin and wetting in Fennoscandia in the coming decades largely as a consequence of greenhouse gas forcing of climate. To place these and other “Old World” climate projections into historical perspective based on more complete estimates of natural hydroclimatic variability, we have developed the “Old World Drought Atlas” (OWDA), a set of year-to-year maps of tree-ring reconstructed summer wetness and dryness over Europe and the Mediterranean Basin during the Common Era. The OWDA matches historical accounts of severe drought and wetness with a spatial completeness not previously available. In addition, megadroughts reconstructed over north-central Europe in the 11th and mid-15th centuries reinforce other evidence from North America and Asia that droughts were more severe, extensive, and prolonged over Northern Hemisphere land areas before the 20th century, with an inadequate understanding of their causes. The OWDA provides new data to determine the causes of Old World drought and wetness and attribute past climate variability to forced and/or internal variability
Links between Beech Tree Quality and Assortments Made of them
No full textIn our research we dealt with the standing tree, estimation of the standing tree, evaluation of its quality and evaluation of quality of assortments made of it. Thereby we critically discussed diverse criteria, currently used in the practice – the five-grade scale for standing tree evaluation, used on permanent sampling plots, and current standards for evaluating the quality of the produced assortments. On the basis of a small analyzed sample of the evaluated and afterwards felled trees we were determining links between quality of trees and assortments as well as similarities and differences occurring when we use different standards for estimation of assortments. We highlight the issues of diverse standards, which are currently valid or most frequently used in practice in Slovenia
Situation of the Slovenian Sawmill Sector in 2013/2014
No full textThe Slovenian sawmill industry has undergone numerous changes since the beginning of economic crisis in 2008, mainly due to the decline in production in the furniture and construction industry. Consequently the sawmill sector struggled for survival instead of investing in new technologies and implementing innovations. In the framework of the international IDWOOD project (taking place between 2012 and 2014), aiming to promote and foster innovation and competitiveness of SMEs in the wood sector in the SEE area, an analysis of the Slovenian sawmill sector was carried out in order to identifying major gaps. Concurrently similar analysis was also carried out in the neighbour regions of the SEE area (i.e. Croatia, Bosnia and Herzegovina and Serbia). In the current article we would like to present the findings of the performed study. The results were compared with the situation of the sawmill industry in other SEE regions and advanced European countries
Physical Properties of Beech Wood after the Ice Storm
No full textPhysical properties (moisture content and density) of wood of variously damaged uprooted European beech (Fagus sylvatica L.) trees were studied at the end of the first vegetation period after the ice storm damage in Slovenian forests in 2014. The research confirmed significant correlation between the amount of active root system and necrosis of leaves and changed moisture content and its distribution in the trunks. The moisture content of wood below 60 % (indicating extinguished protection against wood destroying organisms) was found in sapwood of extremely damaged trees. At the end of the first vegetation period after damage we could not confirm any reduction of wood density (and reduced mechanical properties) which would indicate deterioration of wood
Mnenje v zvezi z vprašanjem novinarke spletnega portala zurnal24.si glede prisotnosti ličink (gosenic) na listih breze
No full textPoročilo o spremljanju stanja gozdov za leto 2014: Vsebinsko poročilo o spremljanju stanja gozdov v l. 2014 v skladu s Pravilnikom o varstvu gozdov (2009)
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Overview of dendroclimatilogical studies in the Balkan peninsula
No full textTo develop climate models and improve the decision-base for future
forestry and agronomy strategies, information on the frequency, intensity and
duration of extreme events from the time before instrumentally measured
meteorological data should be assessed. The science of acquiring this information
is dendrochronology. It is used by various disciplines, such as archaeology and
climatology, to date old wooden objects, compare individual climatic factors to
tree-ring proxies on an annual scale or to reconstruct past climate.
Dendrochronological investigations on the Balkan Peninsula have been made in
several sites and species. Scientists have discovered a clear temperature signal on
temperature sensitive sites, droughts as the most limiting growth factor in inner
parts of the Balkan Peninsula and, on some sites, sunshine/moisture stress as the
most influential factor for tree growth. Analysing years of extremely enhanced or
reduced tree growth has revealed events such as instability of the climate signal
in time, extreme droughts or wet summers, the influence of volcanic eruptions or
past fire damage. Combining new results from the latest studies and extending
chronologies further back in time, using wood from archaeological excavations,
will improve the atlas of past droughts or extreme climatic events, in both spatial
and temporal dimensions and will ease the creation of future climate adaptation
policies
Tretje vmesno poročilo projekta ID:WOOD SEE/D/0227/1.2/X: perioda 1. 7. 2013 - 31. 12. 2013 : clustering knowledge, innovation and design in the SEE WOOD sector
Full text linkDevelopment of the HPLC method for separation of some phenolic compounds of wood
No full textThe most suitable composition of mobile phase for the separation of simple phenolic compounds such as gallic acid, pyrocatechol, phloroglucinol, resorcinol, vanillin and related compound catechin by the high performance liquid chromatography was investigated. The most appropriate developing mobile system for the separation of these organic compounds was acetonitrile and 2% water solution of formic acid with gradient ratio from 2.98 to 25:75. The best separation of the six organic compounds was achieved using mobile phase with lower content of formic acid. HPLC is a method of choice for qualitative and quantitative analysis compounds in various types of samples in the broad field of forestry-wood-pulp-paper chain