Journal of Forest Science, 2018 (vol. 64), issue 4
Dry Biomass Estimation of Hedge Banks: Allometric Equation vs. Structure from Motion via Unmanned Aerial VehicleOriginal Paper
Stefan LINGNER, Eiko THIESSEN, Kerrin MÜLLER, Eberhard HARTUNG
J. For. Sci., 2018, 64(4):149-156 | DOI: 10.17221/152/2017-JFS 
The wood yield of hedge banks is very heterogeneous and hard to estimate in advance. The aim of the present study was to estimate the dry biomass of hedge banks shortly before harvesting using two different non-destructive approaches: (i) allometric equation based on DBH, (ii) volume calculations based on Structure from Motion; and to compare these estimations to the results of the (invasive) reference method: weighing after harvesting. Study objects were three different 100 m hedge banks in Schleswig-Holstein, Germany that were divided into 10 m segments (n = 30). These segments were harvested and weighed separately to calculate...
Effect of hydroseeding on grass yield and water use efficiency on forest road artificial soil slopesOriginal Paper
Aidin PARSAKHOO, Mohammad JAJOUZADEH, Ayoob REZAEE MOTLAGH
J. For. Sci., 2018, 64(4):157-163 | DOI: 10.17221/2/2018-JFS
Hydroseeding treatments are increasingly being used as a feasible alternative for soil erosion control after forest road construction. This study investigated the germination and biomass production of two hydroseed mixes and assessed the effectiveness of these treatments to reduce the water consumption of grass. Hydroseed mix 1 (water + seed + organic tackifier + starter fertilizer + superabsorbent) and hydroseed mix 2 (mentioned materials in mix 1 + biohumus + cellulose fibre mulch + natural yarn) were compared to a control (prevalent mix including seed + animal fertilizer) during the study period (30 days in July). Hydroseed mix 2 significantly...
Utilization of wood and bark of fast-growing hardwood species in energy productionOriginal Paper
Vasiliki KAMPERIDOU, Charalampos LYKIDIS, Panagiotis BARMPOUTIS
J. For. Sci., 2018, 64(4):164-170 | DOI: 10.17221/141/2017-JFS
In this research, the calorific value and ash content of wood and bark of some fast-growing hardwood species, such as tree-of-heaven, (Ailanthus altissima (Miller) Swingle), empress tree (Paulownia tomentosa (Thunberg) Steudel), trembling aspen (Populus tremuloides Michaux), oriental plane (Platanus orientalis Linnaeus) and black locust (Robinia pseudoacacia Linnaeus) were investigated in order to comprehend their behaviour during combustion and estimate their utilization potential as solid biofuels (pellets). Beech (Fagus sylvatica Linnaeus) wood was used for comparative reasons. Different ratios...
Effects of planting interval and soil type on volume production and slenderness index of poplar (Populus nigra L.) plantations in Diwandareh region (Kurdistan province, western Iran)Original Paper
Reyhane LATIFY, Ahmad ALIJANPOUR, Abas Banj SHAFIEI, Arezou SADEGHI
J. For. Sci., 2018, 64(4):171-177 | DOI: 10.17221/113/2016-JFS
Tests were done on seven poplar (Populus nigra Linnaeus) plantations to investigate the effects of planting interval of stands and soil properties on total volume production, commercial volume production and slenderness index. The parameters of stands like diameter at breast height, total height, stem height, total volume, commercial volume and slenderness index were measured and compared with soil characteristics and planting intervals. Results showed significant differences in qualitative characteristics of poplar stands in relation to tested planting intervals and physical soil characteristics. The highest mean commercial volume was found...
An assessment of biological control of Polygraphus major Stebbing, 1903 (Coleoptera: Curculionidae) by entomopathogenic fungiOriginal Paper
Abdul Lateef KHANDAY, Abdul Ahad BUHROO
J. For. Sci., 2018, 64(4):178-186 | DOI: 10.17221/140/2017-JFS
Recently the use of fungal entomopathogens against bark beetles has gained increasing attention throughout the world and researchers continue to seek highly pathogenic fungal isolates for controlling beetle pests. In the present study, the efficacy of three entomopathogenic fungi, namely Beauveria bassiana (Balsamo) Vuillemin, Metarhizium anisopliae sensu lato (Metchnikoff) Sorokin and Lecanicillium lecanii (Zimmerman) Zare & Gams, was tested against Polygraphus major Stebbing, 1903 under laboratory conditions. Each fungal suspension contained 1.0 × 109 spores of fungi in 1 ml. An insecticide - Cyclone...
Evaluation of four methods of fitting Johnson's SBB for height and volume predictionsOriginal Paper
Friday Nwabueze OGANA
J. For. Sci., 2018, 64(4):187-197 | DOI: 10.17221/151/2017-JFS
Johnson's SBB is the most commonly used bivariate distribution model in forestry. There are different methods of fitting Johnson's distribution, and their accuracies differ. In this article, the method of conditional maximum likelihood (CML), moments, mode and Knoebel and Burkart (KB) were used to fit Johnson's SBB distribution. A total of 4,237 diameter and height data obtained from 90 sample plots of Eucalyptus camaldulensis Dehnhardt were used. Evaluation was based on tree height and volume predictions. The predicted and observed tree heights and volumes were compared using the paired sample t-test. The average...