Comparing natural regeneration of Norway spruce Picea abies (L.) Karst. in the Kaszuby Lake District and in the other regions of northern Poland (original) (raw)
Related papers
Forest Research Papers, 2015
The Kaszuby Lake District is located beyond the natural range of Norway spruce, however its share in local forest stands is considerable (14.8%) and its vitality and growth are here not less than within the natural range. The study presents the results of stock-taking of natural regeneration of Norway spruce in this region in year 2002 and 2012 and the relevant silvicultural recommendations. The stock of spruce natural regeneration was taken using the electronic database of the Regional Headquarters of State Forests in Gdańsk. The regeneration was put into following categories: seedlings (height below 0.5 m), lower advanced growth (height above 0.5 m and DBH below 7 cm), higher advanced growth (height above 3 m and DBH above 7 cm) and undergrowth (with dominating self sown spruce). In total 20 834 ha of Norway spruce natural regenerations were listed in year 2002 and 26 016 ha in year 2012 (increase by 24.9%). Most of them occur in fresh sites suited for mixed deciduous forests (LMś...
Natural regeneration of Norway Spruce (Picea abies (L.) Karst.) stands on northern Velebit
Background and Purpose: Natural regeneration is a natural phenomenon that depends on numerous factors. Regeneration of virgin forests is successful even without any human interference. For the regeneration of economic forests we do not have that much time and thus try to speed up the process. The study of factors involved in natural regeneration as the most perfect system of forest ecosystem regeneration requires long lasting research. Material and Methods: Numbers and heights of seedlings and new growths, as well as the species participating in natural regeneration were measured on four test plots over the period of four years (1995, 1998, 1999, 2000). The plots were located at different elevations and contained different plant communities. The Norway spruce seed yield and its quality (germination) were also researched. Results: Very poor appearance of seedlings and new growth and even the decline in the numbers were observed on all test plots. This can be directly correlated to ma...
Natural regeneration in narrow strip clear-cuts of Norway spruce (Picea abies L.) stands
Baltic Forestry
The rate of natural regeneration of Norway spruce and birch in narrow strip clear-cuts in Norway spruce stands between 25 to 30 years of age in South Sweden, and the relationships between rate of regeneration and environmental conditions have been studied in order to find the best methods of natural regeneration. First year regeneration was evaluated by counting seedlings within circle sample plots located on scarified belts within strip clear-cuts. About 14.5 % of total variation in the rate of spruce regeneration and 12.7 % in the rate of birch regeneration were due to peculiarities of stands and strip clear-cuts. The rest of variation was due to within strip clear-cut variation of micro-site ecological conditions. In separate stands the correlation between the regeneration rate and some ecological factors studied varied due to differences between these stands. There was found very weak negative correlation between the regeneration of spruce and the width of strip. The correlation...
K e y w o r d s : Norway spruce, natural regeneration, irradiation, forest soil, ground vegetation, mycorrhiza, forest gaps. S u m m a r y DIACI J., KUTNAR L., RUPEL M., SMOLEJ I., URBANCIC M. & KRAIGHER H. 2000. Interactions of ecological factors and natural regeneration in an altimontane Norway spruce (Picea abies (L.) Karst.) stand. -Phyton (Horn, Austria) 40 (4): (17) -(26).
Forest Ecology and Management, 1997
In the absence of reliable and representative data on the frequency of seed years, seed amounts, germination and survival of seeds, the data of the observation period 1992-1996 of the permanent national forest inventory of Austria are used to develop a model describing the probability for the occurrence, density and height of Norway spruce (Picea a&es (L.) Karst) natural regeneration in the forests of Austria. The forest inventory provided data on natural regeneration (saplings between 10 and 130 cm height) on clusters within a 3.89 km square sampling grid. A logistic equation is used to predict the probability for natural regeneration occurrence. Input parameters for this equation are the variables that describe the site, with slope and azimuth as continuous variables, and growth districts and vegetation types as discrete variables; the crown competition factor describes density and the quadratic mean diameter describes the stage of development of the stand. The same equation type is used to predict the probability for the occurrence of Norway spruce, conditional on the occurrence of some regeneration. An additional variable in this species specific model is a dummy variable which is set to 1 if Norway spruce occurs in the overstory and otherwise zero. Additional site variables entering this model are elevation and vegetation types characterizing soil fertility and moisture. Because the density and height of spruce regeneration depends on the stand's susceptibility to browsing, the probability for browsing is also modelled as a logistic equation depending on elevation, vegetation type, and stand density. Finally the probability distribution for height and density of the regeneration is described by two bivariate Weibull-distributions, each one describing browsed and unbrowsed Norway spruce regeneration respectively. 0 1997 Elsevier Science B.V.
Forest Research Papers, 2015
The purpose of this study was to determine the growth variability of four provenances of Picea abies on experimental plots in the Wyszków Forest District, central Poland. The experiment was established as a system of random blocks with four repetitions per block. We selected 48 trees from each provenance and the increment cores were colected from sample trees. Standard measurements of the width of annual increments were performed using the WinDendro software. Raw data was then indexed and subject to dendroclimatic analyses based on the average monthly temperatures and precipitation of the period from 1969 to 2012. Furthermore, the COFECHA software was used to check the consistency of the data and to determine the pointer years. High data consistency as well as growth variability of particular provenances in response to climatic conditions was observed. The results obtained here will allow for an improved selection of populations best suited for growing in the climate of central Poland
Two permanent sample plots (both 0.25 ha) were established in a mixed forest in the Orlické hory Mts. Protected Landscape Area (northeastern Bohemia) to analyze the natural regeneration of Norway spruce (Picea abies [L.] Karst.) and silver fir (Abies alba Mill.). All the seedlings (height 0.1-0.5 m), saplings (height 0.5 m, d 1.3 3 cm) and trees (d 1.3 > 3 cm) were localized and measured. The analysis of the spatial pattern and statistical evaluation were carried out by means of Ripley's K-function. All the growth stages of the spruce and the fir showed an aggregated (clump) pattern, whereas the regeneration of fir was positively correlated with mature spruces and the regeneration of spruce was in a positive relation with mature firs. The results indicate that for germination and stable growth in the first stages of development, the fir can find more favourable conditions under the crowns of spruce trees and the spruce under mature firs.
Annals of Forest Science
& Key message Natural regeneration of P. abies (L.) H. Karst. may reach high densities in lower mountain elevations. The highest densities were found in sites with moderate light availability, with low pH, and not near the riverbank. However, age-height classes differed in the predicted magnitude of response, but were consistent in response directions. Mosses and understory species typical of coniferous forests were positively correlated with regeneration density. & Context Norway spruce Picea abies (L.) H. Karst. in Central Europe is at risk under climate change scenarios, particularly in mountain regions. Little is known about the impact of environmental factors on the natural regeneration of P. abies in lowelevation mountain forests. & Aims We aimed to assess impacts of distance from the riverbank, soil pH, and light availability on natural P. abies regeneration. We hypothesized that (1) natural P. abies regeneration would depend on light availability and soil pH and (2) there are understory plant species which may indicate the microsites suitable for natural regeneration of P. abies. & Methods The study was conducted in the Stołowe Mountains National Park (SW Poland, 600-800 m a.s.l.). We established 160 study plots (25 m 2) for natural regeneration, light availability, soil pH, and understory vegetation assessment.
Forests
In the present study, the following features were investigated: the variability of selected macrostructure features (width of the annual growth ring and share of latewood) and wood density of the European spruce (Picea abies (L.) Karst.) in a cross-section of the trunk. The study was conducted in locations of the northeastern range (12 research plots) and the southwestern range (20 research plots) of spruce in Poland. On the testing plots, Pressler drill borehole samples were taken from 15 selected trees. Then, the borehole samples were divided into 2 cm long sections and, for each section, the average width of the annual growth ring, the average share of latewood, and the relative wood density were calculated. In conclusion, it was found that the width of the annual growth rings in the tested material was increasing constantly from the outer circumference (the perimeter) of the trunk towards the pith. The greatest share of latewood was found not only in the perimeter zones of the t...
European Journal of Wood and Wood Products, 2016
The purpose of this study was to increase knowledge of the variability of wood density and annual growth of Norway spruce growing in the Ukrainian Carpathians. The material consisted of 21 trees which were cut between 600 m and 1200 m asl from southwest and northeast expositions of the mountain Dovshka. The ovendry and relative wood density increased from the bottom (630 m asl) to the top (1190 m asl) of the mountain and was related to increasing number of tree rings in 1 cm, whereas the width of annual rings decreased expressively. Three significant categories of altitude (forest types) of Norway spruce timbers were estimated for the mountain forest stands. The highest average ovendry wood density (413 kg m-3) and number of tree rings in 1 cm (17.1) were characterized by spruce trees growing at the wet rocky bilberry spruce forest (above 1000 m asl). Wood density and annual growth are two variables which were significantly correlated with each other and the altitude (R = 0.5-0.6).