Journal of Forest Science, 2018 (vol. 64), issue 6

Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) standsOriginal Paper

Vilém PODRÁZSKÝ, Zdeněk VACEK, Ivo KUPKA, Stanislav VACEK, Michal TŘEŠTÍK, Jan CUKOR

J. For. Sci., 2018, 64(6):245-250 | DOI: 10.17221/19/2018-JFS  

The effects of silver fir (Abies alba Miller) on the soil compared to Norway spruce (Picea abies (Linnaeus) H. Karsten) were evaluated. Altitude of the study site is 790 m a.s.l., mild slope of 10° facing SW, forest site is spruce-beech on acid soil. The forest floor and top soil horizons (L + F1, F2 + H, Ah) were sampled in 4 replications beneath unmixed Norway spruce and silver fir groups. Comparing the soil-forming effects of both species, few significant differences were found in the Ah horizon - contents of total C, N, exchangeable Al and plant available Ca were higher beneath spruce. The soil improving role of silver fir compared...

Evaluation of animal logging in the mixed broadleaved mountain forest: Economic and environmental impactsOriginal Paper

Aysan BADRAGHI, Jörn ERLER, Seyed Ata Ollah HOSSEINI, Robert LANG

J. For. Sci., 2018, 64(6):251-259 | DOI: 10.17221/18/2018-JFS  

This investigation assessed the economic and environmental impacts of small-scale wood logging by mules in the mixed broadleaved mountain forest. To develop a time prediction model, all measurements of time are replaced by their decadic logarithms. Unit cost was calculated by two methods: (i) as usual, division of the system cost by average productivity per hour, (ii) on the basis of the developed logarithmic models. To investigate the residual damage a 100% inventory method was employed in pre- and post-hauling, alongside the mule trail. A core sampling technique of bulk density was used for determining the degree of soil compaction,...

Spatial patterns of trees from different development stages in mixed temperate forest in the Hyrcanian region of IranOriginal Paper

Maryam KAZEMPOUR LARSARY, Kambiz TAHERI ABKENAR, Hassan POURBABAEI, David POTHIER, 3, Beitollah AMANZADEH

J. For. Sci., 2018, 64(6):260-270 | DOI: 10.17221/7/2018-JFS  

Mixed beech (Fagus orientalis Lipsky) forests are very important to the Hyrcanian region of Iran because of their high degree of naturalness and as a source of wood production. Determination of tree spatial patterns over development stages is a first step in understanding underlying processes driving regeneration and forest dynamics. Spatial patterns of trees from three development stages (initial, optimal and decay) of an untouched mixed beech forest were quantified within three 1-ha plots. To prepare the stem maps, we measured each tree with a DBH larger than 7.5 cm using the azimuth-distance method. Spatial patterns were then analysed using...

Shrinkage of Scots pine wood as an effect of different tree growth rates, a comparison of regeneration methodsOriginal Paper

Ondřej SCHÖNFELDER, Aleš ZEIDLER, Vlastimil BORŮVKA, Lukáš BÍLEK, Martin LEXA

J. For. Sci., 2018, 64(6):271-278 | DOI: 10.17221/23/2018-JFS  

The Scots pine (Pinus sylvestris Linnaeus) is one of the most important commercial tree species in Central Europe, yet we know very little about the variability of its wood properties. The aim of this study is to primarily analyse the impact of different tree growth rates and site characteristics on the shrinkage of Scots pine wood. The investigated forest stands are located at two sites of the Czech Republic that are characteristic for Scots pine silviculture. At each site, sample trees were selected from two stands representing two variants of the silvicultural treatment, i.e. a clear-cutting and shelterwood system with long regeneration...

Phenotypic variability of Fraxinus excelsior L. and Fraxinus angustifolia Vahl under the ash dieback disease in the Czech RepublicOriginal Paper

Slavica PAPIĆ, Václav BURIÁNEK, Roman LONGAUER, Tomáš KUDLÁČEK, Jiří ROZSYPÁLEK

J. For. Sci., 2018, 64(6):279-288 | DOI: 10.17221/30/2018-JFS  

The study was carried out in the experiment with 16 provenances of common ash (Fraxinus excelsior Linnaeus) and 2 provenances of narrow-leaved ash (Fraxinus angustifolia Vahl) at a series of 5 parallel trial plots established in a gradient from lowland riverine to upland ravine sites. The role of the site, ash species and the provenance of common ash proved to have significant effects on the intensity of ash dieback (ADB) associated with the infection by Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya at the age of 20 years. Narrow-leaved ash was healthier, surviving and growing better than...