Journal of Forest Science, 2021 (vol. 67), issue 7

Methodological approaches to the valuation of forest ecosystem services: An overview of recent international research trendsReview

Caterina Patrizia Di Franco, Gianmarco Lima, Emanuele Schimmenti, Antonio Asciuto

J. For. Sci., 2021, 67(7):307-317 | DOI: 10.17221/13/2021-JFS  

Forests represent the most important source of ecosystem services (ES) on a global level both for the production of goods and for the provision of services and externalities, nevertheless scientific research in the economic field is lacking. Currently the number of documents relating to ES is 16 673, of which only 1 379 concern the forestry sector. The aim of this study is to provide an overview of scientific research trends in the field of economic evaluation of forest ecosystem services (FES). To this end, an on-line bibliographic survey was carried out on the main scientific search engines, which made it possible to quantify the works and at the...

Semi-empirical estimation of log taper using stem profile equationsOriginal Paper

Andrii Bilous, Viktor Myroniuk, Viktor Svynchuk, Oleksandr Soshenskyi, Oleksandr Lesnik, Yaroslav Kovbasa

J. For. Sci., 2021, 67(7):318-327 | DOI: 10.17221/209/2020-JFS  

In January 2019 the forest industry in Ukraine adopted European standards for measuring and grading of round wood based on mid-point diameters, which caused major discrepancies from traditionally used estimates of timber volume using top diameters. To compare methods of merchantable wood volume estimation, we investigated the stem form inside bark for two dominant tree species in Ukraine, i.e. Scots pine (Pinus sylvestris L.) and common oak (Quercus robur L.). We used tree stem measurements to fit stem profile equations, whereas simulation was applied to derive log taper. We found that Newnham's (1992) variable-exponent taper...

The study of parent-regeneration relationships for wild cherry (Prunus avium L.) in Hyrcanian forestsOriginal Paper

Bahman Kiani, Kiyan Yegandoost

J. For. Sci., 2021, 67(7):328-337 | DOI: 10.17221/200/2020-JFS  

The regeneration of forest trees is affected by the presence, dispersion pattern and specifications of parent trees. These effects were investigated and modelled in hardwood forests in the north of Iran. To do so, at first, fifty plots, each with a total area of 0.1 ha, were identified. Four subplots with a radius of two meters were then stabilized in each plot. The height and the root collar diameter of all the cherry seedlings were measured. Likewise, the diameter, basal area, and distance from the plot centre were appraised in the parent trees. The correlation and regression analyses were performed to evaluate the effects and to construct the models,...

Exploring the variability in elastic properties of roots in Alpine tree speciesOriginal Paper

Alessio Cislaghi

J. For. Sci., 2021, 67(7):338-356 | DOI: 10.17221/4/2021-JFS  

Quantifying the soil reinforcement provided by roots is essential for assessing the contribution of forests to reducing shallow landslide susceptibility. Many soil-root models were developed in the literature: from standard single root model to fibre bundle model. The input parameters of all models are the geometry of roots (diameter and length) and the biomechanical properties (maximum tensile force and elastic modulus). This study aims to investigate the elastic properties estimated by the stress-strain curves measured during tensile tests. A standard procedure detected two different moduli of elasticity: one due to the root tortuosity, and the other...

Accumulation of heavy metal pollution caused by traffic in forest trees in the park of Kerey and Janibek Khans of the city of Nur-Sultan, KazakhstanOriginal Paper

Sezgin Ayan, Dani Sarsekova, Gani Kenesaryuly, Ergin Yilmaz, Orhan Gülseven, Ilknur Şahin

J. For. Sci., 2021, 67(7):357-366 | DOI: 10.17221/37/2021-JFS  

Air quality in Nur-Sultan, the fast-growing new capital city of Kazakhstan, has been poorly investigated. This research was carried in Kerey and Janibek Khans Park in Nur-Sultan, the capital city of Kazakhstan, which is affected by "different traffic density" on the roads. Three different categories of contamination (i) high pollution (distance from the main road 10-15 m), (ii) moderate pollution (distance from the side road 15-30 m), and (iii) low pollution (distance from the source of contamination 30-80 m) at different levels resulting from urban transportation were examined. The aim of the study is to determine the pollution...