Template-Type: ReDIF-Article 1.0
Author-Name: Mohammad Reza POURMAJIDIAN
Author-Name: Hossein Kavian
Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, Sari Agricultural and Natural Resources University, Sari, Iran
Title: Assessment of plant biological diversity and soil characteristics in the pure ash tree stand and in mixture with beech (a case study of Lavij-Noor, Iran)
Abstract: The present study has been done to evaluate the impact of pure ash stand and mixed stand with beech on the herb layer biodiversity and soil properties in the forests of Noor city. There is a unique stand of ash in the forests of Noor city and at 1,900-2,100 m a.s.l., which is rarely seen like that in the northern forests of Iran. Shannon-Wiener diversity indices (H'), Simpson index of dominance (D), Margalef richness (R1) and Pielou's evenness were used to analyse biodiversity. Sampling was also conducted to investigate physical and chemical properties of soil (bulk density, acidity, electrical conductivity, soil moisture, soil lime, nitrogen and organic carbon) in each sample plot and at two depths (10 and 20 cm). The total number of 26 soil samples (13 soil samples at either depth) in pure ash stand and 24 soil samples (12 soil samples at either depth) from this type of stand mixed with beech were taken. The results of plant species biodiversity showed that between the pure ash stand and the stand mixed with beech there is a significant difference at the 99% probability level in Shannon-Wiener diversity, Margalef richness, and Simpson dominance. There is also a significant difference at the 95% probability level between the two stands under study in Pielou's evenness index. The results of soil factors also showed that at the depth of 10-20 cm acidity factor showed a significant difference from its adjacent stand at the 99% probability level. There is also a significant difference at the 99% probability level in acidity (0-10 cm) and soil moisture at the depth of 10-20 cm between the two areas, but there is not any significant difference between the areas under study in electrical conductivity and lime factors at the two depths and also in moisture content at the depth of 0-10 cm. It should be noted that between the stand and soil nitrogen, organic carbon and bulk density parameters at both depths (0-10 and 10-20 cm) a significant difference at the 95% confidence level is shown.
Keywords: Hyrcanian forest, mixed stand, biodiversity, Shannon-Wiener, soil chemical properties
Journal: Journal of Forest Science
Pages: 443-448
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/81/2016-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/81/2016-JFS.html
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Handle: RePEc:caa:jnljfs:v:63:y:2017:i:10:id:81-2016-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: Karel MATĚJKA
Title: Multivariate analysis for assessment of the tree populations based on dendrometric data with an example of similarity among Norway spruce subpopulations
Abstract: The new method for evaluation of tree populations presented here is based on a correlation analysis within a set of dendrometric variables. The correlation analysis is carried out for each population separately. The method evaluates differences between resulting correlation matrices. These distances can be used by hierarchical cluster analysis (unweighted pair-group average) or by ordination analysis (non-metric multidimensional scaling - NMS). Test data were obtained in 10 research plots in the area of Medvědí Mt., Šumava National Park. Plots are located in Norway spruce [Picea abies (Linnaeus) H. Karsten] climax forests. The results enable ecological interpretation of both classification and NMS. The populations (subpopulations) differ in their origin (spontaneous succession or partial planting) and environmental conditions (extreme environment near the mountain summit versus water-logged soils). These differences were reflected in results of the classification and ordination of the spruce (sub)populations.
Keywords: dendrometry, hierarchical classification, ordination, Picea abies
Journal: Journal of Forest Science
Pages: 449-456
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/106/2016-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/106/2016-JFS.html
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Handle: RePEc:caa:jnljfs:v:63:y:2017:i:10:id:106-2016-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: Ondřej SCHÖNFELDER
Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic
Author-Name: Aleš ZEIDLER
Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic
Author-Name: Vlastimil BORŮVKA
Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic
Author-Name: Lukáš BÍLEK
Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic
Title: Influence of site conditions and silvicultural practice on the wood density of Scots pine (Pinus sylvestris L.) - a case study from the Doksy locality, Czech Republic
Abstract: After spruce, the Scots pine (Pinus sylvestris Linnaeus) is the second most important commercial coniferous tree species in the Czech Republic. However, we are finding out that awareness of the variability of properties, and possibilities to affect them, are noticeably small for this type of tree species in our conditions. The goal of this study is to primarily evaluate the importance of site conditions, silvicultural measures and other factors for the density of Scots pine wood in the Doksy locality in the Czech Republic. The Doksy locality is represented by three forest stands with different silvicultural history. Samples were taken from each stand, the basal and central parts of which were subsequently processed for test samples with dimensions of 20 × 20 × 30 mm. Wood density at 12% moisture content was ascertained in the test samples. The highest density value of 0.541 g.cm-3 was reached in a stand that is regenerated using the shelterwood method with long regeneration period, and the lowest density value of 0.488 g.cm-3 was recorded in a stand that was regenerated using the clear-cutting method. From a forestry perspective, it can be further stated that the wood density of Scots pine is also affected by the site conditions and position of samples in the trunk.
Keywords: shelterwood regeneration, clearcut, forest site, softwoods, physical properties, variability
Journal: Journal of Forest Science
Pages: 457-462
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/62/2017-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/62/2017-JFS.html
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Template-Type: ReDIF-Article 1.0
Author-Name: Mohammad Hussein SERAJ
Author-Workplace-Name: Department of Forest Science, Faculty of Natural Resources, Yazd University, Yazd, Iran
Author-Name: Bahman KIANI
Title: Efficiency of sector sampling for estimating juniper forest attributes vs. fixed area plot
Abstract: Juniper forests grow in mountain areas and many difficulties are encountered in their sampling. Sector sampling as an unbiased and cost-effective method was tested for the sampling of a 12.5-ha juniper forest. To begin with, a point-map of trees was created and 50 quadrats were determined systematically. Fixed area plots were measured within these 50 × 50 m quadrats. In each quadrat, eight sectors with 45° angle were determined. One-sector and two-sector scenarios randomly besides four-sector scenario systematically were conducted. Accuracy and precision of sampling methods were compared. Also, statistical analysis was conducted to compare sector sampling scenarios with fixed area plot (FAP) and real data. Results showed that four-sector scenario estimates were close to FAP method in precision and accuracy. Statistical analysis showed that there was no significant difference between sector sampling scenarios and FAP and in real data. But in correlation analysis only the four-sector scenario could compete with FAP method. Regarding consumed time and sampling error simultaneously, the efficiency of sector sampling was higher than that of FAP method for estimating density and close to FAP method for estimating crown cover. It can be concluded that in laborious situations such as in juniper forests, sector sampling can be competitive with FAP method with noticeable parsimony. But more study is still needed to decrease sampling error and optimize sector angle with the purpose of cost saving.
Keywords: accuracy, crown cover, density, precision, plot shape
Journal: Journal of Forest Science
Pages: 463-469
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/22/2017-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/22/2017-JFS.html
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Template-Type: ReDIF-Article 1.0
Author-Name: Katherine KARAMANOLI
Author-Workplace-Name: Forest Research Institute, Hellenic Agricultural Organization "DEMETER", Vasilika - Thessaloniki, Greece
Author-Name: Athanasios PAPAIOANNOU
Author-Workplace-Name: Laboratory of Forest Soils, Department of Forestry and Natural Environment, School of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, Finikas - Thessaloniki, Greece
Author-Name: Stella SOFOGIANNI
Author-Workplace-Name: Laboratory of Forest Soils, Department of Forestry and Natural Environment, School of Agriculture, Forestry and Natural Environment, Aristotle University of Thessaloniki, Finikas - Thessaloniki, Greece
Title: Soil fertility and productivity estimation of Pinus pinaster Aiton reforestations in Central and Northeast Chalcidice in Northern Greece
Abstract: Maritime pine (Pinus pinaster Aiton) is a notable fast-growing conifer, native to the Western Mediterranean Basin, which is considered suitable for reforestations. This tree species was artificially installed in Chalcidice, Northern Greece, about 40 years ago, in order to upgrade mountain ecosystems. The experiment reported in this paper was undertaken to estimate soil conditions and the development progress of maritime pine in the above reforestations. Samples of mineral soil and forest floor were taken from 12 different sites at 2 locations. Despite age, rather weak maritime pine trees are found in both studied locations. Furthermore, significant accumulation of organic matter and nutrients was observed in both forest floor and mineral soil.
Keywords: degraded ecosystems, conifer, native vegetation, accumulation of nutrients, forest floor, mineral soil
Journal: Journal of Forest Science
Pages: 470-475
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/68/2017-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/68/2017-JFS.html
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Template-Type: ReDIF-Article 1.0
Author-Name: Jan KADAVÝ
Author-Workplace-Name: Department of Forest Management and Applied Geoinformatics, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic
Author-Name: Michal KNEIFL
Author-Workplace-Name: Department of Forest Management and Applied Geoinformatics, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic
Author-Name: Barbora FEDOROVÁ
Author-Name: Jaroslav BARTŮNĚK
Author-Workplace-Name: Department of Forest Management and Applied Geoinformatics, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic
Title: Evaluation of transformation from even-aged to selection forest by means of Gini index
Abstract: We used the Gini index for evaluation of the 40-year transformation to selection forests in the Training Forest Enterprise Masaryk Forest Křtiny (Czech Republic). The Gini index values for particular forest stands were compared with the reference values derived from the diameter distribution model curve (type E) by Meyer. From a total of sixteen stands which were evaluated in 2013 (the last periodic inventory), only two stands reached the desired diameter structure. Four other stands reached the desired diameter structure at least once during the transformation period. We recommend the application of Gini index for determination of a success rate of even-aged stand transformation to selection forest.
Keywords: stand transformation, selection system, structural indices, forest management
Journal: Journal of Forest Science
Pages: 476-484
Volume: 63
Issue: 10
Year: 2017
DOI: 10.17221/48/2017-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/48/2017-JFS.html
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