Journal of Forest Science, 2016 (vol. 62), issue 10
Below-canopy and topsoil temperatures in young Norway spruce and Carpathian birch stands compared to gaps in the mountainsOriginal Paper
O. Špulák, D. Kacálek
J. For. Sci., 2016, 62(10):441-451 | DOI: 10.17221/77/2016-JFS 
Reduced air pollution load has allowed to use commercially oriented forestry in the Central European mountains since the 1990s. The goal is, however, to restore species- and age-diversified stable stands that are expected to cope with uncertain changes of the harsh mountain climate. The microclimate of current young forest stands can impact on growth and performance of underplanted seedlings. In the present study, aboveground (+10 cm), surface (0 cm) and belowground (-10 cm) temperatures were compared under Norway spruce and Carpathian birch canopies. Measurements were performed in 22-year-old Norway spruce and Carpathian birch stands and replicated...
Recreational values of forest park using the contingent valuation method (case study: Saravan Forest Park, north of Iran)Original Paper
S. Mohammadi Limaei, G. Safari, G. Mohammadi Merceh
J. For. Sci., 2016, 62(10):452-462 | DOI: 10.17221/4/2016-JFS
The aim of this research was to evaluate the economic values of Saravan Forest Park, north of Iran. The contingent valuation method was used for this propose. In order to do this research, 480 questionnaires were used. The questionnaires were distributed randomly among the visitors in different seasons. A linear logit regression model was used to estimate the relation between dependent and independent variables. The software including MS Excel, Eviews and Shazam was used for statistical analysis of variables, mathematical calculation and parameter estimation of the logit model. Results indicated that the variables such as proposed entrance fee, monthly...
Radial evolution of vascular elements in the oak Quercus ilex L. woodOriginal Paper
M. Berrichi, K. Benabdelli, A. Haddad
J. For. Sci., 2016, 62(10):463-469 | DOI: 10.17221/85/2015-JFS
In order to describe and measure the evolution of vascular elements in time, we examined two groups of samples of the green oak (Quercus ilex Linnaeus) wood. These groups are on the same radial plane and come from two trees growing under identical conditions and with different ages. The first group is located in the internal zone between the 15th and 19th growth ring and the second group is situated in the external area before the sapwood. The analysis of results shows the outside zone with isolated, numerous and large vessels compared to the internal zone. The results also explain how the vascular elements develop...
Nonlinear mixed effect height-diameter model for mixed species forests in the central part of the Czech RepublicOriginal Paper
R.P. Sharma, Z. Vacek, S. Vacek
J. For. Sci., 2016, 62(10):470-484 | DOI: 10.17221/41/2016-JFS
Various forest models that estimate volume, site index, growth and yield, biomass, and sequestrated carbon amounts are based on the information of the tree heights. The tree heights are obtained either directly from measurements or indirectly estimated using height-diameter models. We developed a nonlinear mixed effect height-diameter model applicable to both conifer and broadleaved tree species through the introduction of dummy variable that accounts for the variations in the height-diameter relationship, caused by the effects of species-specific differences. Data from 255 sample plots located within the multi-layered mixed species forests in the...
Physiological responses of seedlings of different Quercus castaneifolia C.A. Mey. provenances to heterogeneous light environmentsOriginal Paper
F. Babaei, S.G. Jalali, H. Sohrabi, A. Shirvany
J. For. Sci., 2016, 62(10):485-491 | DOI: 10.17221/56/2016-JFS
In this study, five biochemical traits obtained for seedlings of five different provenances of Quercus castaneifolia C.A. Meyer were used to evaluate the available light environment using instantaneous electronic readings as a standard. Experimental design was executed under controlled conditions at six different irradiance levels (10, 20, 30, 50, 60, and 70% of full light). Results show that among total chlorophyll (Chlmass), chlorophyll a to b ratio (Chla:Chlb), N, chlorophyll to N ratio (Chl:N), and peroxidase (POD) quantitative activity, the latter provides the highest realistic correlation with available...