Journal of Forest Science, 2020 (vol. 66), issue 9

Effect of structure and dynamics of forests on the occurrence of Erythronium dens-canisOriginal Paper

Stanislav Vacek, Rostislav Linda, Ivo Králíček, Karel Vančura, Anna Prokůpková, Romana Prausová

J. For. Sci., 2020, 66(9):349-360 | DOI: 10.17221/96/2020-JFS  

The paper presents the results of a study on the impact of forest stand structure and development in 1998 to 2018 on the occurrence of dog's tooth violets (Erythronium dens-canis L.) in the Medník National Nature Monument, Czech Republic. The research was carried out in mixed European hornbeam and sessile oak stands, herb-rich European beech stands and the Sázava-river Norway spruce ecotype stands. The site and stand characteristics of the following three forest stand types were compared: 1) oak-hornbeam forests, 2) herb-rich beech forests and 3) secondary spruce forests. The results showed that the ratio of sterile and fertile plants was...

Improving drainage conditions of forest roads using the GIS and forest road simulatorOriginal Paper

Mehran Nasiri, Behnaz Askari

J. For. Sci., 2020, 66(9):361-367 | DOI: 10.17221/16/2020-JFS  

In this study a new method of locating culverts is presented with the composition of achieved discharge from hydrological analysis and simulated forest roads in RoadEng 3D simulator to improve drainage condition. Locating culverts was performed on a small scale (1:20 000, using GIS) and large scale (1:2 000, road geometric design simulator). The small-scale study regarding the achieved discharge from streams shows that the installation of some culverts is not necessary. The large-scale study also showed that the geometric design of forest road has a significant effect on locating culverts and its accuracy. To improve drainage conditions 6 culverts...

Efficiency of some conservation treatments for soil erosion control on unallowable slopes of skid trailsOriginal Paper

Akbar Mazri, Aidin Parsakhoo, Mohsen Mostafa

J. For. Sci., 2020, 66(9):368-374 | DOI: 10.17221/61/2020-JFS  

The aim of this study was to determine the suitable conservation treatments to control water erosion from skid trails in ShastKalate forests. Two longitudinal slopes of 20-40% and > 40% were considered as critical slopes for skid trails. Treatments of water diversion ruts, water diversion ruts filled with slash and stones were implemented on each slope. A rubber bar was installed at the end of the slope to convert runoff into collectors. Sampling was done during rainfall events in autumn and winter seasons. Findings indicated that the treatment of water diversion ruts filled with slash was better than the other treatments in the control of sediment...

Verification of two- and three-parameter simple height-diameter models for birch in the European part of RussiaOriginal Paper

Aleksandr Lebedev, Valery Kuzmichev

J. For. Sci., 2020, 66(9):375-382 | DOI: 10.17221/76/2020-JFS  

The accuracy of determining the height of trees is essential both in forestry and in scientific research. Height is usually determined using specific models, where it is a function of the diameter at breast height. On the materials of 23 sample plots with the measurement of model trees in birch stands, the parameters were determined for 29 two-parameter and three-parameter models that are most often found in literary sources. The following metrics evaluated the quality of the models: root mean square error, mean absolute percentage error, coefficient of determination, adjusted coefficient of determination, Akaike information criterion, and Bayesian...

Seedling dynamics and community forecast for disturbed forests of the Western Himalayas: a multivariate analysisOriginal Paper

Afsheen Khan

J. For. Sci., 2020, 66(9):383-392 | DOI: 10.17221/101/2020-JFS  

The present study focuses on the forest structure of highly disturbed sites in Western Himalayan regions in Pakistan. In this study, the regeneration potential of conifer species is a key point for the assessment of future conifer status in disturbed environment by employing multivariate techniques. The forests are composed of four conifer species Pinus wallichiana A. B. Jacks, Pinus roxburghii Sarg., Cedrus deodara (Roxb.) G. Don, and Abies pindrow (Royle ex D. Don) Royle., associated with broadleaved species Quercus baloot Griffith, Quercus dilatata Raf., and Aesculus indica (Wall. ex Cambess.) Hook. Cluster analysis shows five groups when Pinus...