scholarly journals Evaluation of the growth and health of different poplars in the Latorica area in Východoslovenská nížina conditions

2012 ◽  
Vol 49 (No. 10) ◽  
pp. 482-489
Author(s):  
Š. Kohán
Keyword(s):  
Health Status ◽  
Diameter Growth ◽  
Forest Site ◽  
Maximum Volume ◽  
Ecological Conditions ◽  
Poplar Clones ◽  
Lowland Area ◽  
Volume Production ◽  
Site Types

The paper presents the results of evaluating the growth and health of 20 different poplars from the Aigeiros group in 30-year populetum Leles on uninundated alluvia of the Latorica River in ecological conditions of the lowland Východoslovenská nížina. The populetum is situated on medium-heavy loamy soils in the group of forest site types Ulmeto-Fraxinetum carpineum. The results of evaluation document that out of the investigated poplar clones the poplars I-214, I-476, Blanc du Poitou, Flachslanden and P. nigra (Baka 5) had the best height and diameter growth and maximum volume production. Their health status was also very good. The lowest volume production was determined in P. nigra (009/66 ČR), I-455 and Grandis, and the worst health was found out in Grandis, P. nigra (Pavlovce 1) and P. nigra (Ivachnova 1). These results will facilitate to include the poplars I-476 and Flachslanden in the assortment of regionalized poplars for the lowland area of Východoslovenská nížina.

scholarly journals Preliminary results of research on main growth characteristics of different poplar clones in ecological conditions of Východoslovenská Lowland

2002 ◽  
Vol 48 (8) ◽  
pp. 372-376
Author(s):  
Š. Kohán ◽  
Keyword(s):  
Growth Characteristics ◽  
Diameter Growth ◽  
Forest Types ◽  
Maximum Volume ◽  
Preliminary Results ◽  
Mean Diameter ◽  
Volume Increment ◽  
Volume Production ◽  
Annual Volume ◽  
Main Growth

Height and diameter growth and volume production of 22 different clones of poplars were evaluated in Sliepkovce populetum at the age of 12 years. The populetum is situated on medium-heavy and medium humic uninundated alluvia of the Laborec river; typologically, the group of forest types is Ulmeto-Fraxinetum populeum. The results of evaluation documented that among the poplars under study the clones Gigant, OP-229 and BL achieved the best growth and maximum volume production while their mean height amounted to 22.9–23.8 m, mean diameter to 31.9–33.2 cm and average annual volume increment was 25.1–28.3 m3 per 1 ha. The growth of P. Rochester 20/66 poplar was considerably much slower: its mean height amounted to 17.3 m, mean diameter to 18.7 cm and average annual volume increment was 6.3 m3 per 1 ha. It will be necessary to carry out further studies to obtain more detailed values for these clones.

scholarly journals Variation of conducting area in stems of European larch (Larix deciduas) growing in fresh mixed coniferous forest and fresh mixed forest sites

2010 ◽  
Vol 56 (No. 1) ◽  
pp. 18-27 ◽  
Author(s):  
M. Nawrot ◽  
M. Jakubowski ◽  
W. Pazdrowski ◽  
K. Kaźmierczak ◽  
M. Szymański
Keyword(s):  
Coniferous Forest ◽  
Mixed Forest ◽  
Coefficient Of Determination ◽  
Forest Site ◽  
Age Classes ◽  
Main Crop ◽  
Forest Sites ◽  
The Social ◽  
Individual Trees ◽  
Site Types

The paper presents an attempt to determine conducting area (CA), relative conducting area (CA.k<sup>–1</sup>) and mean ring conducting area (CAar) on discs cut at breast height from stems of larch trees growing in fresh mixed coniferous forest and fresh mixed forest sites, representing four age classes and the main crop according to Kraft’s classification. The value of CA increases with an improvement of the social class of tree position in the community, while no such dependences were found for the value of (CA.k<sup>–1</sup>). The parameter CAar, except for one case in age class IV in the fresh mixed coniferous forest site, increases with an improvement of the position a tree takes in the community and differentiates more markedly under the conditions of fresh mixed forest sites. Relative conducting area (CA.k<sup>–1</sup>) decreases markedly with an increase in the age of trees, which is confirmed by high values of the coefficient of determination. Moreover, the significance of differences between individual trees in the main crop according to Kraft and forest site types was tested in terms of the values of CAar. Calculated values may be used to describe the relationships between conducting area and the size of the assimilating organ more precisely than the total sapwood zone.

scholarly journals Characteristics of chosen biometric features of European ash (Fraxinus excelsior L.) due to the age of trees and the forest site type

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Krzysztof Turczański ◽  
Katarzyna Kaźmierczak ◽  
Bogna Zawieja
Keyword(s):  
Strong Relationship ◽  
Floodplain Forest ◽  
Analysis Of Covariance ◽  
Forest Site ◽  
Diameter At Breast Height ◽  
Site Type ◽  
Breast Height ◽  
Biometric Features ◽  
European Ash ◽  
Site Types

The dieback of European ash contributes the disappearance of the species from the typical ash sites such as floodplain forests or alder-ash forests. The species occurs more often in moist broadleaved forests and fresh broadleaved forests. Therefore, the main objective of our study was to determine the influence of ash age and the forest site type on the chosen biometric features of dominant and codominant trees. We also aimed to compare the sizes of European ash growing in optimal forest site types with less fertile ones, where it does not occur as the main species. We collected the empirical material from 25 plots representing 4 forest site types: fresh broadleaved forest, moist broadleaved forest, floodplain forest, and alder-ash forest. The research plots were located in the Babki, Konstantynowo, and Łopuchówko Forest Districts, western Poland. The age of ash varied from 52 to 144 years. On each plot, we measured a tree height and a diameter at breast height of 15 dominant and codominant ash trees. Subsequently, we used measured features to calculate the volume of each tree. We carried out the analysis of covariance of diameter at breast height, height, and volume. The analysis showed the strong relationship of examined features with the age of the species and the forest site type. Furthermore, our results indicated the underestimation of the growth possibilities of European ash in fresh broadleaved forest and moist broadleaved forest. In these sites, ash achieved similar sizes in comparison to optimal forest site types, i.e. floodplain forest and alder-ash forest. This result cannot be omitted in forestry practice, especially in silviculture, which should aim to support the natural regeneration of European ash in differentiated site conditions. Keywords: European ash, forest site type, age of a tree, biometric features

scholarly journals HEIGHT INCREMENT OF NATURALLY REGENERATED YOUNG FOREST STANDS OF SCOTS PINE PINUS SYLVESTRIS L. IN MYRTILLOSA FOREST SITE TYPE

2015 ◽  
Author(s):  
Olga MIEZĪTE ◽  
Ineta EGLĪTE ◽  
Solveiga LUGUZA ◽  
Imants LIEPA
Keyword(s):  
Health Status ◽  
Scots Pine ◽  
Initial Density ◽  
Stand Density ◽  
Forest Site ◽  
Height Increment ◽  
Forest Stands ◽  
Annual Increment ◽  
Site Type ◽  
Young Forest

One of the most important stand productivity and competition indicators is height annual increment, which is affected by various factors such as soil preparation, initial density as well as various management risk factors. Empirical material for the research was collected in the northern part of Latvia. In four pure Scots pine stands in Myrtillosa forest site type 29 circular plots tree diameter, height and the last five years annual height increment was measured and visual state of health was described. The aim of this research is to analyse Scots pine height annual increment in naturally regenerated young forest stands in Myrtillosa site type forest stands and to give an evaluation of the impact of the initial stand density and the health status on height growth. The mean height increment in studied stands is 0.26 ± 0.009 m and the average periodical increment is 0.37 ± 0.042 m. The annual height increment has been in the height range from 0.23 to 0.53 m. Initial stand density affects the annual height increment significantly. In the stand with an initial density of 5770 ± 961 trees the height increment during the last five years has risen by 36%, but in stand with initial density of 12,650 ± 1,581 trees (P = 51.8 % and R = 6.0 %) the height increment during the five-years period has increased by only 12 %. The tree health status does not affect the tree height increment significantly.

scholarly journals Ertragskundliche Aspekte und Strukturdynamik der Buchen-Lichtwuchsdurchforstung

2018 ◽  
Vol 169 (6) ◽  
pp. 332-339 ◽  
Author(s):  
Joachim Klädtke
Keyword(s):  
Volume Growth ◽  
Basal Area ◽  
Structural Diversity ◽  
Maximum Volume ◽  
Negative Effects ◽  
Single Tree ◽  
Stand Productivity ◽  
Single Tree Selection ◽  
Volume Production ◽  
Equilibrium Growth

Effects of heavy selective thinnings in beech stands with regard to stand productivity and structural diversity Based on thinning trials in beech stands initiated in the early 1970s, the effects of selective thinnings in favour of 100 to 120 future crop trees were analysed with regard to volume productivity and the stands' structural diversity. The results show that these kinds of thinnings reduce volume productivity by approximately 6% compared to the maximum volume growth. The reduction in volume growth is mostly caused by the fact that the strongly released crop trees have reduced their height growth for the benefit of a lateral crown expansion, while basal area growth was not affected. Calculations indicate that silvicultural systems working with only 50 future crop trees per hectare may decrease the maximum volume production by about 12%. Furthermore, the results show that the intense crown releases caused by selection thinnings increase the horizontal and vertical diversity of beech stands, since the trees in the understorey profit from better light conditions. The indices calculated for diameter and height diversity of the selection thinning plots approach the values being typical for single tree selection forests (“Plenterwälder”). Already after three to four consecutive selection thinnings, the beech stands' diameter distributions displayed an exponentionally decreasing shape typical for single tree selection forests close to equilibrium. Growth simulations revealed that it might even be possible to directly transform beech stands by selection thinnings into single tree selection structures. However, presumably negative effects on timber quality to be expected under single tree selection structures should be considered as a critical aspect with regard to theoretically possible transformation.

scholarly journals Forest site types and soil cover in the Roztocze National Park – the current state of knowledge

2015 ◽  
Vol 70 (1) ◽  
pp. 7
Author(s):  
Jacek Koba ◽  
Tadeusz Miśta
Keyword(s):  
National Park ◽  
Soil Cover ◽  
Soil Sampling ◽  
Soil Survey ◽  
Forest Site ◽  
Forest Types ◽  
Upland Forest ◽  
Current State ◽  
Forest Sites ◽  
Site Types

The forest sites and soil survey conducted by the Bureau for Forest Management and Geodesy, Branch in Lublin in the years 2009–2010 involved all of the Roztocze National Park (RNP). The studied area was 8335.31 ha. Throughout the Park, 417 soil sampling plots (open pits) and 2,400 auxiliary soil sampling plots (soil boreholes) were established. A total of 28 soil subtypes, subsumed under 14 soil types, were identified, with the most abundant soil type being rendzina. Furthermore, 17 forest site types were described, including 12 lowland and 5 upland forest site types. Two upland forest types (upland broadleaved forest and upland mixed broadleaved forest), were found to be predominant in the National Park.

scholarly journals Carbon Pools in a Hemiboreal Over-Mature Norway Spruce Stands

Forests ◽  
2018 ◽  
Vol 9 (7) ◽  
pp. 435 ◽  
Author(s):  
Laura Ķēniņa ◽  
Didzis Elferts ◽  
Endijs Bāders ◽  
Āris Jansons
Keyword(s):  
Norway Spruce ◽  
Boreal Forests ◽  
Carbon Stock ◽  
Basal Area ◽  
Carbon Pool ◽  
Total Carbon ◽  
Forest Site ◽  
Tree Biomass ◽  
Spruce Stands ◽  
Site Types

Old unmanaged forests are commonly assumed to be carbon neutral; however, there is still a lack of reference studies available to increase the recognition of carbon stock changes in these forests. Studies of old forest carbon storage from hemiboreal regions are very rare compared to temperate and boreal forests in Europe; therefore, the aim of this study was to quantify the carbon stock in hemiboreal over-mature (167–213 years) Norway spruce (Picea abies (L.) Karst.) stands. To explore the total ecosystem carbon pool, the carbon stock of tree biomass, deadwood, and soil in unmanaged (for at least the last 40 years) spruce stands was calculated and compared between different forest site types on dry, wet, and drained mineral soils. Total carbon stock of hemiboreal over-mature spruce stands ranged from 164.8 Mg C ha−1 to 386.7 Mg C ha−1, and 238.5 Mg C ha−1 on average, with no significant differences (p > 0.05) between the forest site types. The carbon stock of tree biomass was significantly affected by the basal area of the upper tree layer (p < 0.0001) and the interaction between the forest site type and proportion of spruce in the stand composition (p = 0.002). Tree biomass was the dominant carbon pool, followed by soil and deadwood in over-mature spruce stands.

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