scholarly journals Long-term silvicultural experiment with transformation of the mixed stand structure

2011 ◽  
Vol 57 (No. 6) ◽  
pp. 259-265
Author(s):  
L. Šimerda ◽  
J. Souček
Keyword(s):  
Air Pollution ◽  
Stand Structure ◽  
Spatial Arrangement ◽  
Health Condition ◽  
Mixed Stand ◽  
Diameter Distribution ◽  
Individual Species ◽  
Growing Stock ◽  
Partial Opening ◽  
Model Curve

The paper summarizes the main characteristics of a mixed stand during 80-year transformation to the mixed stand with permanent selective structure. The initial main stand was mostly composed of conifers with group arrangement, broadleaves as the reserved trees created the upper storey. Partial opening by thinnings prepared the stand for regeneration. Heavy thinning in 1959 (22% of the growing stock) opened the main stand and released the advance growth of broadleaves. Subsequent stand development was negatively affected by air pollution. Mainly fir and spruce responded to air pollution by deteriorated health condition and increment reduction. Beech and other broadleaves gradually increased their proportion in the stand (64% of the growing stock in 2008). Initial diameter distribution was sinistral, reserved trees affected the frequency of thick trees. Final diameter distribution resembled the model curve for selective forests, the number of thin trees was below the model curve for broadleaved forests with selective structure in these types of localities. Mean increments of individual species changed according to their stand position. Low fecundity of trees, weed infestation and game damage limited natural regeneration, artificial regeneration dominated for the whole time. The complicated structure corresponding to selective forest occurred rarely during the monitored period, the stand was differentiated mainly by spatial arrangement.

scholarly journals Thinning Response and Potential Basal Area in a Mixed Sub-humid Low-elevation Oak-Hornbeam Forest

2021 ◽  
Author(s):  
Mathias Neumann ◽  
Hubert Hasenauer
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Climatic Conditions ◽  
Diameter Distribution ◽  
Stem Density ◽  
Growing Stock ◽  
A Site ◽  
Water Nutrients ◽  
Related Mortality

Abstract Competition for resources (light, water, nutrients, etc.) limits the size and abundance of alive trees a site can support. This carrying capacity determines the potential carbon sequestration in alive trees as well as the maximum growing stock. Lower stocking through thinning can change growth and mortality. We were interested in the relations between stand structure, increment and mortality using a long-unmanaged oak-hornbeam forest near Vienna, Austria, as case study. We expected lower increment for heavy thinned compared to unmanaged stands. We tested the thinning response using three permanent growth plots, whereas two were thinned (50% and 70% basal area removed) and one remained unmanaged. We calculated stand structure (basal area, stem density, diameter distribution) and increment and mortality of single trees. The heavy thinned stand had over ten years similar increment as the moderate thinned and unthinned stands. Basal area of the unthinned stand remained constant and stem density decreased due to competition-related mortality. The studied oak-hornbeam stands responded well even to late and heavy thinning suggesting a broad “plateau” of stocking and increment for these forest types. Lower stem density for thinned stands lead to much larger tree increment of single trees, compared to the unthinned reference. The findings of this study need verification for other soil and climatic conditions.

scholarly journals Thinning Response and Potential Basal Area—A Case Study in a Mixed Sub-Humid Low-Elevation Oak-Hornbeam Forest

Forests ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1354
Author(s):  
Mathias Neumann ◽  
Hubert Hasenauer
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Climatic Conditions ◽  
Diameter Distribution ◽  
Stem Density ◽  
Growing Stock ◽  
A Site ◽  
Water Nutrients ◽  
Related Mortality

Competition for resources (light, water, nutrients, etc.) limits the size and abundance of live trees a site can support. This carrying capacity determines the potential carbon sequestration in live trees and the maximum growing stock. Lower stocking through thinning can change growth and mortality. We were interested in the relations between stand structure, increment, and mortality using a long-unmanaged oak-hornbeam forest near Vienna, Austria, as a case study. We expected lower increment for heavily thinned compared to unmanaged stands. We tested the thinning response using three permanent growth plots, in which two were thinned (50% and 70% basal area removed) and one remained unmanaged. We calculated stand structure (basal area, stem density, diameter distribution) and increment and mortality of single trees. Over ten years, the heavily thinned stand had a similar increment as that of the moderately thinned and unthinned stands. The basal area of the unthinned stand remained constant and stem density decreased due to competition-related mortality. The studied oak-hornbeam stands responded well even to late and heavy thinning, suggesting a broad “plateau” of stocking and increment for these forest types. Lower stem density for thinned stands led to a much larger tree increment of single trees, compared to the unthinned reference. The findings of this study need verification for other soil and climatic conditions.

Properties of the quadratic mean diameter in balanced diameter distributions

1985 ◽  
Vol 15 (2) ◽  
pp. 474-476
Author(s):  
Donald J. Weatherhead ◽  
Roger C. Chapman ◽  
John H. Bassman
Keyword(s):  
Stand Structure ◽  
Basal Area ◽  
Tree Size ◽  
Diameter Distribution ◽  
Quadratic Mean ◽  
Growing Stock ◽  
Mean Diameter ◽  
Quadratic Mean Diameter ◽  
Stand Basal Area ◽  
Diameter Distributions

Balanced diameter distributions are widely used to describe stand structure goals for residual growing stock in uneven-aged forests. The quadratic mean diameter is frequently used as a descriptor of a balanced diameter distribution. In this paper the quadratic mean diameter is shown to be independent of stand basal area for balanced diameter distributions with a common class width, maximum and minimum diameters, and de Liocourt's q ratio. Additionally it is shown that the quadratic mean diameter is relatively insensitive to changes in maximum tree size and q ratios for q ratios 1.5 and larger.

scholarly journals Health condition of spruce stands in the Orlické hory Mts. in relation to climatic, anthropogenic and stand factors

2008 ◽  
Vol 53 (No. 1) ◽  
pp. 1-12 ◽  
Author(s):  
T. Žid ◽  
P. Čermák
Keyword(s):  
Air Pollution ◽  
Climatic Factors ◽  
Growing Season ◽  
Health Condition ◽  
Pollution Load ◽  
Spruce Stands ◽  
Climatic Anthropogenic ◽  
The Given ◽  
Slope Orientation ◽  
Synergetic Action

In stands with the majority of spruce and aged over 70 years, 35 sample plots were laid out (in total 700 trees) in the vicinity of Anenský vrch Hill at altitudes over 800 m above sea level. In the course of the growing season 2005, the following parameters were determined: total defoliation, defoliation of the primary structure, percentage of secondary shoots, presence and extent of yellowing and browning. In 10 selected trees, branches were taken from crowns for morphological analyses and annual length increments of branches and numbers of secondary shoots in the particular years were determined. Total defoliation and the occurrence of yellowing were related to slope orientation and position of the plot towards the ridge. The number of shoots produced in the given year correlated with the level of annual NO<sub>3</sub> deposition. The determined difference in the occurrence of yellowing between limed and unlimed plots cannot be interpreted unambiguously because limed and unlimed plots differ in exposure at the same time. The determined importance of slope orientation for the health condition of a stand shows that under the simultaneous air pollution load climatic factors are a factor deciding on the resulting effect of the synergetic action of stressors on forest stands.

scholarly journals Patch dynamics and the development of structural and spatial heterogeneity in Pacific Northwest forests

2011 ◽  
Vol 41 (12) ◽  
pp. 2276-2291 ◽  
Author(s):  
Van R. Kane ◽  
Rolf F. Gersonde ◽  
James A. Lutz ◽  
Robert J. McGaughey ◽  
Jonathan D. Bakker ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Stand Structure ◽  
Spatial Scales ◽  
Canopy Structure ◽  
Patch Dynamics ◽  
Spatial Arrangement ◽  
Airborne Lidar ◽  
Small Scale ◽  
Individual Site ◽  
Time Required

Over time, chronic small-scale disturbances within forests should create distinct stand structures and spatial patterns. We tested this hypothesis by measuring the structure and spatial arrangement of gaps and canopy patches. We used airborne LiDAR data from 100 sites (cumulative 11.2 km2) in the Pacific Northwest, USA, across a 643 year chronosequence to measure canopy structure, patch and gap diversity, and scales of variance. We used airborne LiDAR’s ability to identify strata in canopy surface height to distinguish patch spatial structures as homogeneous canopy structure, matrix–patch structures, or patch mosaics. We identified six distinct stand structure classes that were associated with the canopy closure, competitive exclusion, maturation, and three patch mosaics stages of late seral forest development. Structural variance peaked in all classes at the tree-to-tree and tree-to-gap scales (10–15 m), but many sites maintained high variance at scales >30 m and up to 200 m, emphasizing the high patch-to-patch heterogeneity. The time required to develop complex patch and gap structures was highly variable and was likely linked to individual site circumstances. The high variance at larger scales appears to be an emergent property that is not a simple propagation of processes observed at smaller spatial scales.

Air pollution and health condition of inhabitants of big cities in Śląskie Voivodship

2020 ◽  
Vol 65 (6) ◽  
pp. 39-51
Author(s):  
Zofia Mielecka-Kubień ◽  
Andrzej Wójcik
Keyword(s):  
Air Pollution ◽  
Life Expectancy ◽  
Environmental Pollution ◽  
High Standard ◽  
Health Condition ◽  
Standard Of Living ◽  
Industrial District ◽  
Big Cities ◽  
High Level ◽  
Very High

Big cities in Śląskie Voivodship, especially those from the territory of the former Upper Silesian Industrial District, are characterised by a high level of industrialization, relatively high standard of living and very high level of environmental pollution. The aim of the study described in this paper is to assess the levels of selected types of air pollution in big cities in Śląskie Voivodship and to compare them against chosen reports on the health condition of the population of the voivodship in the years 2014–2016. The study was based on data from the Chief Inspectorate of Environmental Protection and Statistics Poland. The comparison of selected indicators of the health condition of the populations in the studied cities against their levels of air pollution demonstrated that in cities where air pollution reached the highest levels, the values of indicators of mortality were also the highest, whereas the values of indicators of life expectancy of newborn babies were the lowest. The worst situation regarding both the air pollution and health condition was observed in Chorzów, Dąbrowa Górnicza and Rybnik, and the best in Bielsko-Biała and Tychy.

Forestry Working Groups/Groupes du travail: The Forests and the New Forest Injury in the Federal Republic of Germany

1985 ◽  
Vol 61 (3) ◽  
pp. 262-267
Author(s):  
J. Holowacz
Keyword(s):  
Air Pollution ◽  
Federal Republic ◽  
Forest Fires ◽  
Complex Disease ◽  
Federal Republic Of Germany ◽  
Annual Increment ◽  
Growing Stock ◽  
Working Groups ◽  
New Forest ◽  
Individual Trees

The new forest injury in the Federal Republic of Germany is defined as a complex disease caused by a multiplicity of factors in which air pollution plays a major role. Since 1982, one reconnaissance and two comprehensive forest injury inventories have been carried out. The data from the latest (1984) inventory show that over 50% of the country's forested area has been affected by this new forest injury. Conifers tend to be more severely affected than hardwoods, and trees older than 60 years are more likely to be injured than the younger ones. The consequences of the injury are manifesting themselves in a drastic reduction of growth as well as mortality of, so far, individual trees. A forced removal of "calamity timber" is resulting in the creation of unplanned openings and a distortion of age class distribution. A further spread of the injury, both in area and intensity, will make the Federal Republic even more dependent on foreign timber supplies and in the process, change the appearance of the German landscape. Key words: Actual cut, air pollution, employment in forestry, Federal Republic of Germany, forest fires, forest injuries, growing stock, mean annual increment, "Waldsterben".

scholarly journals Forest Diversity and Modeling Diameter Distribution of the Tropical Dryforest in East Nusa Tenggara, Indonesia

2020 ◽  
Vol 9 (1) ◽  
pp. 21-28
Author(s):  
Aah Ahmad Almulqu ◽  
Keyword(s):  
Forest Management ◽  
Stand Structure ◽  
Likelihood Function ◽  
Dry Forest ◽  
Diameter Distribution ◽  
Structure Model ◽  
Distribution Models ◽  
Forest Diversity ◽  
Product Regulation ◽  
Forest Conditions

The variation of forest conditions shows structural differences, species composition, and potential value as well as stand density. The need and important role of stand structure model in forest management, particularly in forest-based product regulation become the supply demands quantitatively for various forest conditions in Indonesia. The objective of the study was to determine the stand structure model of dry forest. The study was conducted at the dry forest of Binafun, Bonmuti, Letkole and Oelbanu, East Nusa Tenggara Province. Determination of the best stand structure model based on maximum likelihood function of family distribution that tested including the function of exponential, gamma, lognormal and Weibull. A total of 2097 tree individuals, its representing 94 species, 72 genera and 45 families, were found in the research sites. Eucalyptus urophylla were found to be the most dominant species in the research sites and Elattostachys verrucosa have potential to replace Dryobalanops aromatic. Most of family distribution models can describe the stand structure in research sites. The models presented here are the basis for further developments toward the tree diversity for general purpose in tropical dry forest management of East Nusa Tenggara, Indonesia.

scholarly journals RECREATIONAL INFLUENCE ON THE CONDITION AND STRUCTURE OF FOREST SHELTER BELTS

2018 ◽  
pp. 84-93
Author(s):  
N. Y. Vysotska ◽  
S. V. Sydorenko ◽  
S. H. Sydorenko
Keyword(s):  
Stand Structure ◽  
Average Diameter ◽  
Condition Index ◽  
Health Condition ◽  
Health State ◽  
Green Ash ◽  
Steppe Species ◽  
Shelter Belts ◽  
Long Term Impact ◽  
Forest Shelter Belts

The influence of recreation of varying intensity on the health condition and structure of forest shelter belts formed by common oak (Quercus robur L.) and green ash (Fraxinus lanceolata Borkh.) is estimated. The long-term impact of recreational pressure on shelterbelts that were identical at the time of creation was evaluated. It was found that the long recreational influence of different intensity leads to a significant decrease in the stocking of the tree stand (by 27.5%), changes in the stand structure, deterioration of health condition (in the S-2 section, the health condition index was І.7 and in the S-1 section, ІІ.3) and a decrease in the average diameter of the trees (by 20.5 %). In addition, such an effect led to a significant reduction in the density, both for advance growth (by 73.5 %) and undergrowth (71.3 %), which ultimately affected the change in the openness of the vertical profile of the shelterbelt. Frequently, uncontrolled burning of refuse and dry grass by recreators provoked the emergence of surface fires and additional weakening of the trees in the stand (the health state of damaged trees fluctuated within the 3-4 category of health condition) as well as partial destruction of the advance growth and undergrowth. Cenomorphic analysis of forest phytocoenoses by Belgard revealed the predominance of ruderants. Sylvants (typical species for the forest) and Pratants (steppe species) are represented by three species and have occurred seldomly.

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