1721 research outputs found
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Service Life of Beech Wood in Outdoor Applications
No full textBeech wood is amongst the most important wood species in Slovenia. The EU standard EN 350-2 classifies beech wood into the group of the least durable wood species. This is one of the most important reasons which limit the use of beech wood in outdoor applications. The majority of the data about beech wood durability is a result of laboratory tests as there were limited numbers of field tests performed. As the service life of wood significantly depends on the local climate conditions, this data cannot be simply copied from other countries. Therefore, field tests have been running at the field test site of the Department of Wood Science and Technology for several years now to determine comprehensive performance of most important Slovenian wood species including beech wood. Majority of the tests are performed in use class 3 applications (above ground, not covered). The first signs of decay on beech wood are visible after few months of exposure. Afterwards the decay proceeds and the samples are degraded between 4 and 6 years of exposure. The most important reasons for insufficient outdoor performance of beech wood are lack of biologically active extractives and low water exclusion efficacy. In order to elucidate this phenomenon moisture content was continuously monitored for 15 months. We believe that the field tests performed will lead us to the data which will enable better understanding of the phenomena of durability and improve durability of beech wood with state of the art modification solutions
Potential Use of Beechwood and Estimation of Value Added of Beechwood Products
No full textHigh value added of various wood products as a result of wood processing is crucial for achieving economic efficiency of operations. The study presents potential use of beechwood (Fagus sylvatica L.) and an estimation method for value added of beechwood products. For easier and more transparent study and determination of value added of over 350 so far identified products made of beechwood, 28 groups of products based on technological similarities were suggested. Since the indicator of total value added of product cannot be used for comparison of diverse products (due to different amounts of wood in the material structure of a product as well as due to variety of technological and other requirements of the production), we have developed a model for estimation of value added of beechwood products. In this model, three additional indicators were proposed: (1) total value added per amount of wood used in the product, (2) total value added on share of value of wood used in the product and (3) share of value added in the selling price of the product. The latter is the most important for business decisions. One of the main obstacles to apply the model and evaluate as well as collect the data is to determine the prices of both inputs and outputs. This is closely related to incomparability in determination of the quality of wood in the entire forest-wood chain. Application of the model and identification of problems is presented in detail for the case of sawn wood product
Localities and sites of the southeastern-alpine endemic species spiraea decumbens koch in Breginjski kot (northwestern Slovenia)
No full textEvaluating spatial stratification for sampling forest cover data
No full textStratification based on Slovenian forest typology has been proposed for sampling forest land-use/ land-cover data and changes over time. Using land-use map and forest typology map we evaluated geographic scales of variance for landscape-level indices and compared stratification by administrative units and regions. As forest prevails in 10 out of 12 statistical regions in terms of its surface area, these regions cannot be effective stratification tool for sampling and mapping land-use. Statistical regions accounted for 21 percent of the total variance of percent agriculture and 17 percent of total variance in amount of forest. Through the classification of quadratic 1 square kilometre tiles according to the typology of forest site types, somewhat greater proportion of total variance has been explained by stratification than on the spatial scale of statistical regions, although on the account of the high number of groups (29 strata). The great differences in fragmentation indices for these forest groups illustrate that the spatial scale for the formation of strata is smaller than the regional one
Multiple forest land use planning: forest functions, priority areas and ecosystem services
No full textAssessment of potential yield of commercial wild mushrooms in Slovenian forests
No full textCommercial value of non-wood forest products is increasing and in some cases can be equal or may even surpass the commercial value of timber. Therefore, an initiative for assessing the potential yield of commercial wild mushrooms in Slovenia arose. We developed empirical spatial models for 27 commercial wild mushrooms. The spatial models have a resolution of 1 × 1 km, assessment for potential production is given in kg × year–1. We verified model accuracy with data from central database of fungi in Slovenia, Boletus informaticus. The accuracy of models range from 60.6% to 99.2%. Estimated potential yield of studied commercial wild mushrooms was 2,869–37,800 tons/year, on average 12,169 tons/year. Potential commercial value of wild mushrooms is estimated at 263–527 €/ha, while overall commercial value of commercial wild mushrooms is estimated at 91–182 million €/year on average. Possible improvements of models for assessing the potential yield of wild mushrooms are discussed
New faunistic data on ants (Hymenoptera: Formicidae) of the southern part of Montenegro
No full textIn spring 2013, we sampled ants from 14 localities in the southern part of Montenegro. Four different collection methods were applied: direct sampling, litter sifting, pitfall trapping and baiting. We present a list of 62 collected ant species, five of which are new records for the country: Camponotus gestroi, C. honaziensis, Lasius nitidigaster, Temnothorax sp. 1, and T. sp. 2. Some of the recorded species are discussed, including a rare subspecies Crematogaster auberti savinae. A short informal description for two unidentified Temnothorax species is given
