Template-Type: ReDIF-Article 1.0
Author-Name: J. Saborowski
Author-Workplace-Name: Faculty of Forest Sciences and Forest Ecology, Georg-August University, Göttingen, Germany
Author-Name: J. Cancino
Author-Workplace-Name: Facultad de Ciencias Forestales, Universidad de Concepción, Concepción, Chile
Title: About the benefits of poststratification in forest inventories
Abstract: A large virtual population is created based on the GIS data base of a forest district and inventory data. It serves as a population where large scale inventories with systematic and simple random poststratified estimators can be simulated and the gains in precision studied. Despite their selfweighting property, systematic samples combined with poststratification can still be clearly more efficient than unstratified systematic samples, the gain in precision being close to that resulting from poststratified over simple random samples. The poststratified variance estimator for the conditional variance given the within strata sample sizes served as a satisfying estimator in the case of systematic sampling. The differences between conditional and unconditional variance were negligible for all sample sizes analyzed.
Keywords: poststratification, systematic sampling, simple random sampling, conditional variance
Journal: Journal of Forest Science
Pages: 139-148
Volume: 53
Issue: 4
Year: 2007
DOI: 10.17221/2171-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/2171-JFS.html
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Handle: RePEc:caa:jnljfs:v:53:y:2007:i:4:id:2171-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: P. Šamonil
Author-Workplace-Name: Department of Forest Ecology, Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Brno, Czech Republic
Title: Uniqueness of limestone soil-forming substrate in the forest ecosystem classification
Abstract: The uniqueness of limestone soil-forming substrate was assessed with respect to the classification of forest ecosystems. 50 soil profiles from the Bohemian Karst were studied and the results were confronted with previously published works from other karst areas. The evaluation of soil profiles was based on a macroscopic description, on the results of chemical and physicochemical analyses, and on a micromorphological study. The carbonate bedrock was a cause of specific genesis of soils in these sites - both recent and relict ones (terrae calcis). However, it does not always condition the unique characteristics of these sites whose differentiation would call for an a priori special edaphic category. Unique geochemical characteristics of the substrate are modified on the gradient of advanced pedogenesis (Holocene up to mid-Pleistocene soils were assessed) by a very intensive soil-forming process connected with the impact of allochthonous, mostly aeolian material. Two possible approaches were designed for the classification of these sites: (i) wider conception - distinction of the basic edaphic category with small limitations for the quality of soil-forming substrate, (ii) narrower conception - limestone edaphic category with a number of limitations to distinguish this edaphic category.
Keywords: limestone, pedology, micromorphology, Rendzic Leptosol, terra fusca, ecosystem classification, Bohemian Karst
Journal: Journal of Forest Science
Pages: 149-161
Volume: 53
Issue: 4
Year: 2007
DOI: 10.17221/2014-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/2014-JFS.html
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Handle: RePEc:caa:jnljfs:v:53:y:2007:i:4:id:2014-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: I. Kozak
Author-Workplace-Name: Department of Landscape Ecology, Faculty of Mathematics and Natural Sciences, Catholic University in Lublin, Lublin, Poland
Author-Name: V. Parpan
Author-Workplace-Name: Department of Landscape Ecology, Faculty of Mathematics and Natural Sciences, Catholic University in Lublin, Lublin, Poland
Author-Name: G. Potaczala
Author-Workplace-Name: Department of Landscape Ecology, Faculty of Mathematics and Natural Sciences, Catholic University in Lublin, Lublin, Poland
Author-Name: H. Kozak
Author-Workplace-Name: Department of Landscape Ecology, Faculty of Mathematics and Natural Sciences, Catholic University in Lublin, Lublin, Poland
Author-Name: A. Zawadzki
Author-Workplace-Name: Department of Landscape Ecology, Faculty of Mathematics and Natural Sciences, Catholic University in Lublin, Lublin, Poland
Title: Natural forest regeneration in spruce monocultures in the Ukrainian Beskids - prognosis by FORKOME model
Abstract: This paper presents the results of investigations on natural forest regeneration in Norway spruce (Picea abies L. Karst.) monocultures in the Ukrainian Beskids with the use of FORKOME model prognostic possibilities. Different variants of regeneration methods are presented. Selective cutting with planting was determined as the most effective: spruce selective cutting with simultaneous planting of target species: beech (Fagus sylvatica L.) and fir (Abies alba Mill.) with admixture of ash (Fraxinus excelsior L.). Beech and fir biomass increases rapidly over the first 20 years - then it stabilizes. After another 20-30 years the initial form of beech forest is recognizable and it is possible to speak about an increase of beech forest, which in the course of time achieves a higher degree of similarity to natural stand. In the Ukrainian Beskids the potential forest stand consists of beech and fir (Dentario glandulosae-Fagetum).
Keywords: Norway spruce, beech, computer model FORKOME, Ukrainian Beskids, spruce monocultures, forest management
Journal: Journal of Forest Science
Pages: 162-169
Volume: 53
Issue: 4
Year: 2007
DOI: 10.17221/2355-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/2355-JFS.html
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Handle: RePEc:caa:jnljfs:v:53:y:2007:i:4:id:2355-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: V. Hurt
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Author-Name: P. Kantor
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Title: Production potential and ecological stability of mixed forest stands in uplands - VI. A beech/larch stand on a mesotrophic site of the Křtiny Training Forest Enterprise
Abstract: The paper is the 6th report on the production potential and stability of mixed forest stands in uplands. A mixed beech/larch stand that was established by natural regeneration in 1934 to 1942 is assessed. The stand is situated at an altitude of 460 m above sea level. It has been left to its natural development since 1961. At that time, the stand was characterized as an individually mixed, diameter- and height-differentiated 25-year pole-stage stand. The proportion of larch and beech amounted to 40% and 17%, respectively. Hornbeam (25%), oak (11%) and to a lesser extent birch (5%) and spruce (3%) also occurred in the stand. In the course of 42 years, the proportion of larch in this stand without planned thinning measures decreased to 35%. On the other hand, the proportion of beech increased to 39%. During all 5-year inventories, the stand could be characterized as a stabilized one with high production potential. Its initial growing stock 63 m3/ha at an age of 25 years increased to 497 m3/ha at an age of 67 years in 2003. At present, current volume increment amounts to 9.8 to 12.5 m3/ha/year.
Keywords: beech, larch, oak, hornbeam, mixed stands, natural development, production, mortality, slenderness ratio
Journal: Journal of Forest Science
Pages: 170-184
Volume: 53
Issue: 4
Year: 2007
DOI: 10.17221/2170-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/2170-JFS.html
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Handle: RePEc:caa:jnljfs:v:53:y:2007:i:4:id:2170-JFS

Template-Type: ReDIF-Article 1.0
Author-Name: J. Suchomel
Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, Brno, Czech Republic
Author-Name: M. Heroldová
Author-Workplace-Name: Institute of Vertebrate Biology, Academy of Science of the Czech Republic, Brno, Czech Republic
Title: A pheasantry as the habitat of small terrestrial mammals (Rodentia, Insectivora) in southern Moravia (Czech Republic)
Abstract: Communities of small terrestrial mammals were studied in the specific environment of two pheasantries in southern Moravia with different intensity of pheasant management and different diversity of biotopes (RB - intensive pheasantry, HJ - extensive pheasantry). In total, ten species from the order Rodentia and Insectivora were found there in 2002-2005. The rodents Apodemus flavicollis, A. sylvaticus and Clethrionomys glareolus dominated in these habitats. On the other hand, the populations of insectivores were very low, Crocidura leucodon and C. suaveolens being interesting species. RB with the higher variety of biotopes showed significantly higher diversity (P < 0.05) of small mammals (H' = 1.284, ten species determined) than HJ (H' = 1.112, five species determined). The higher intensity of management (the amount of chickens released per unit area and the amount of served food) in RB compared to HJ was not reflected in the relative abundance of the community of small terrestrial mammals (rA in RB = 11.82, in HJ = 11.85) nor in their evenness (E). The probability of difference was P > 0.05. A difference in the diversity of compared communities was conditioned by different diversity of biotopes.
Keywords: pheasantry, diversity, small terrestrial mammals
Journal: Journal of Forest Science
Pages: 185-191
Volume: 53
Issue: 4
Year: 2007
DOI: 10.17221/2015-JFS
File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/2015-JFS.html
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