Journal of Forest Science, 2020 (vol. 66), issue 12
The crown condition of Norway spruce and occurrence of symptoms caused by Armillaria spp. in mixed standsOriginal Paper
Petr Čermák, Tomáš Žid
J. For. Sci., 2020, 66(12):483-491 | DOI: 10.17221/86/2020-JFS 
Mixed stands are currently supported as effective management options to reduce forest vulnerability to climate change. However, our issues about benefits of mixtures, mechanisms of their incidence and conditions for their effectiveness have yet been only partly clarified. We assessed the crown condition of Norway spruce (Picea abies /L./ Karst) and occurrence of symptoms caused by Armillaria spp. on spruce in a small area in the Drahanská vrchovina Highlands (Czech Republic) in differently mixed stands in 2002 and 2019. We found that although the broadleaf abundance affected the total defoliation of Norway spruce, the effect was unstable in time. The...
Long-term tending effect on static stability of pure beech (Fagus sylvatica L.) standsOriginal Paper
Igor Štefančík
J. For. Sci., 2020, 66(12):492-500 | DOI: 10.17221/141/2020-JFS
The production stability together with the provision of required functions are the key requirements for the future existence of stable forest stands. Sufficient mechanic stand stability could be developed by the early and long-term thinning where basic tree characteristics, such as stem and crown parameters play the decisive role. We compared selected parameters of static stability in pure beech stands, which have been exposed to heavy low thinning and free-crown thinning with control stands without interventions. Data from twenty-seven long-term research subplots at eight localities across Slovakia were involved in this study. In total 7 693 trees...
The long-term dynamics of the old-growth structure in the National Nature Reserve Badínsky pralesOriginal Paper
Ladislav Šumichrast, Jaroslav Vencurik, Ján Pittner, Stanislav Kucbel
J. For. Sci., 2020, 66(12):501-510 | DOI: 10.17221/139/2020-JFS
The main goal of this paper was to evaluate structure dynamics in the fir-beech, old-growth forest Badínsky prales. Measurements were taken on four permanent research plots (0.5 ha each) between 1970 and 2018, typically in ten-year intervals. In order to assess long-term structure dynamics, this study used basic stand characteristics and selected structural indices - the relative density (RD), coefficient of homogeneity (H), and structural complexity index (SCI). Species composition was quantified by the relative importance value (RIV), and a detrended correspondence analysis was carried out for the visualisation of long-term changes. The long-term...
Effect of soil moisture content and nitrogen fertilizer on survival, growth and some physiological characteristics of Platycladus orientalis seedlingsOriginal Paper
Alireza Aliarab, Elham Okati Vazifekhah, Seyed-Ehsan Sadati
J. For. Sci., 2020, 66(12):511-523 | DOI: 10.17221/34/2020-JFS
Given the important applications of oriental arborvitae (Platycladus orientalis /L./ Franco), we examined the interaction effects of soil moisture content (SMC) and urea fertilizer on survival, growth and some physiological characteristics of seedlings of this species. In this study, 270 uniform oriental arborvitae seedlings were transplanted in 2 kg containers filled with the top soil of the natural stand in Soorkesh forest reserve. After 2 months, 6 levels of SMC (100%, 75%, 50%, 25%, 15% and 10%) and 3 levels of urea [control: 0, low nitrogen (LN): 75 mg.kg-1, and high nitrogen (HN): 150 mg.kg-1]...
Laboratory assay of entomopathogenic nematodes against the elm leaf beetle, Xanthogaleruca luteola Müller (Col.: Chrysomelidae)Short Communication
Naeimeh Zeinolabedin Fard, Habib Abbasipour, Ayatollah Saeedizadeh, Jaber Karimi
J. For. Sci., 2020, 66(12):524-531 | DOI: 10.17221/89/2020-JFS
The susceptibility of the elm leaf beetle, Xanthogaleruca luteola Müller (Col.: Chrysomelidae), 3rd instar larvae and adults to the entomopathogenic nematodes Steinernema feltiae, S. carpocapsae, and Heterorhabditis bacteriophora was determined in laboratory assays. Larval mortality was assessed at 0, 16, 32,...