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 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.

Growth and yield of unthinned Honduras Pine grown to small sawlog sizes

1969 ◽  
Vol 81 (3-4) ◽  
pp. 125-131
Author(s):  
John K. Francis
Keyword(s):  
Puerto Rico ◽  
Basal Area ◽  
Height Growth ◽  
Growth And Yield ◽  
Diameter Growth ◽  
Pinus Caribaea ◽  
Volume Increment ◽  
Annual Volume

Unthinned spacing of Honduras pine (Pinus caribaea var. hondurensis Morelet) ranging in age from 23.3 to 25 years, was evaluated at four installations in Puerto Rico on the basis of survival, growth, and yield. Results showed that marked significant differences existed in means of survival, diameters, and heights of trees in spacings ranging from 1.5 x 1.5 m to 4.3 x 4.3 m. However, because of decreasing diameter and height growth and increasing mortality in the narrower spacings (1.5 m, 2.1 m), and continued rapid diameter growth in the wider spacings (3.0 m, 4.3 m), there were no significant differences in basal area, total inside bark volume, and mean annual volume increment among spacings. Wide spacings are recommended where early thinnings are not possible.

Growth table for Corsican pine in Flanders (Belgium)

1991 ◽  
Vol 56 ◽  
Author(s):  
B. Meuleman
Keyword(s):  
Insect Pests ◽  
Sandy Loam ◽  
Stand Density ◽  
Forest Tree ◽  
Permanent Plots ◽  
New Findings ◽  
Volume Increment ◽  
The Mean ◽  
Annual Volume ◽  
Very High

After  its introduction at the start of this century, the Corsican pine has become  an important forest tree in Flanders (Belgium). The total area covered by  Corsican pine is about 11.000 ha. Due to climatological factors it is  virtually absent from the Walloon part of Belgium. Despite the crisis in 1984  - 1986, practical experiences with its vitality and disease resistance are  generally positive. Compared to Scots pine which is native to Belgium, its  productivity and insensitivity for insect pests is large.     To quantify the productivity of Corsican pine, a growth table was  constructed using a method developed by PALM and DAGNELIE. It was based on  data from 321 temporarily and 80 permanent plots distributed over Flanders.  Five yield classes were distinguished according to dominant height at 50  years. For each yield class, a series of tables as a function of treatment  was constructed. Treatments were characterized by the mean annual  circumference increment.     These tables allow to predict the growth of Corsican pines. Such  predictions for the whole range of species are necessary for the development  of a good forestry policy and for timber industries. The tables also provide  information for any given Corsican pine stand that is helpful in practice:  expected productivity, stand density, determination of the felling quantum.      The data show that the productivity of Corsican pine is very high. The very  early culmination of the current annual volume increment and the rather  constant level of the mean annual volume increment after culmination are  interesting new findings. It is also shown that it is possible to work with  long rotation periods. This offers good opportunities for the production of  high quality wood and is also important for the social and ecological role of  the forest.     Productivity is lowest on very dry and sandy soils. A high productivity on  moderately dry sand and loamy sand soils and loamy soils make the Corsican  pine one of the most valuable tree species for the Kempen in Flanders.  Although productivity is very high on well drained sandy loam and loam soils,  plantation of Corsican pine on these locations is not advised.

Variation in flowering time and in some growth characteristics of Townsville lucerne (Stylosanthes humilis)

1965 ◽  
Vol 5 (16) ◽  
pp. 49 ◽  
Author(s):  
DF Cameron
Keyword(s):  
Flowering Time ◽  
Significant Variation ◽  
Growth Habit ◽  
Northern Territory ◽  
Growth Characteristics ◽  
Diameter Growth ◽  
Stylosanthes Humilis ◽  
Stem Colour

Significant variation (P<0.001) in flowering time was found between collections of Townsville lucerne (Styloanthes humilisHBK.) from a number of localities in Queensland and the Northern Territory. Collections also varied in plant diameter, growth habit, stem colour, and degree of hard-seededness. Further avenues of study to elucidate the origin and significance of this variation are briefly discussed.

Relationships between tree crown, stem, and stand characteristics in unthinned loblolly pine plantations

1987 ◽  
Vol 17 (6) ◽  
pp. 534-538 ◽  
Author(s):  
Peter T. Sprinz ◽  
Harold E. Burkhart
Keyword(s):  
Loblolly Pine ◽  
Basal Area ◽  
Projection Area ◽  
Diameter Growth ◽  
Tree Crown ◽  
Basal Area Growth ◽  
Area Growth ◽  
Mean Diameter ◽  
Stand Attributes ◽  
Stand Characteristics

Empirical and theoretical relationships between tree crown, stem, and stand characteristics for unthinned stands of planted loblolly pine (Pinustaeda L.) were investigated. Readily measured crown variables representing the amount of photosynthetic area or distance of the translocation process were identified. Various functions of these variables were defined and evaluated with regard to efficacy in predicting stem and stand attributes. Linear models were used to evaluate the contribution of the crown variables in predicting stem and stand characteristics. The stem attributes modeled included basal area, basal area growth, diameter at breast height, and diameter growth, while the stand attributes modeled were basal area, basal area growth, arithmetic mean diameter, and mean diameter growth. Crown diameter and crown projection area were particularly important in contributing to model fit and prediction of individual stem characteristics, while sum of crown projection areas was found especially important in stand level equations. As these crown measures developed over time so did corresponding stem and stand attributes.

Accroissement en volume de l'épinette noire: précision de sa détermination

1991 ◽  
Vol 21 (12) ◽  
pp. 1816-1822
Author(s):  
Richard Zarnovican
Keyword(s):  
Growth Rate ◽  
Prediction Model ◽  
Black Spruce ◽  
Volume Growth ◽  
Probability Level ◽  
Validation Data ◽  
Local Volume ◽  
Volume Increment ◽  
Annual Volume ◽  
Volume Equation

The relationship between volume growth rate and diameter growth rate (diameter at breast height) was studied from growth data established by stem analysis for dominant black spruce trees (Piceamariana (Mill.) B.S.P.) of a black spruce – feather moss stand. The results indicate a very close relationship between the two variables, and a linear model was chosen to predict volume growth rate. Independent model validation, based upon analysis of residual errors, indicates a small positive bias (0.006%) with a relatively good precision (±9.9%) and a χ2 test anticipated accuracy of ±0.71% at the 0.05 probability level. The annual volume increment calculated with the prediction model and with the local volume equation for validation data was more precise (bias = −0.02 dm3/year, precision = ±11.8%) than the volume increment calculated with this model and the general volume equation (bias = −0.39 dm3/year, precision = ±26.4%). Finally, the χ2 test showed that the anticipated accuracy of the annual volume increment was ±0.54 dm3/year at the 0.05 probability level for the prediction model and the local volume equation, and ±0.90 dm3/year for the prediction model and the general volume equation for validation data.

scholarly journals Production Potential and Development of a Decision Support Models for the Plantations of Aleppo Pine in the Oued Laou Watershed in the Moroccan Rif

2021 ◽  
Vol 11 (3) ◽  
pp. 3700-3713
Keyword(s):  
Decision Support ◽  
Aleppo Pine ◽  
Production Potential ◽  
Volume Increment ◽  
Plantation Age ◽  
Decision Support Models ◽  
The Mean ◽  
Annual Volume ◽  
Number Of Stems ◽  
Semi Arid

The present study was carried out in the Oued Laou watershed belonging to the Moroccan Rif. It aims at the elaboration of mathematical tariffs for cubing Aleppo pine, the morphometric and increments study. The data analyzed for this purpose were collected after a preliminary stratification of the forest based on the plantation age. The study of the region’s climate shows that the western sector of the watershed is part of the temperate humid bioclimate, and the eastern sector belongs to the warm variant subhumid. The analysis of the stand-study structure shows that the distribution of the number of stems as a function of the circumference is a distribution close to normal. Cubic rates have been constructed to estimate the volume of trees. The mean annual volume increment of Aleppo pine varies between 3.10 and 4.83 m3/ha/year from one plot to another; this small fluctuation largely reflects the homogeneity of the study area. Aleppo pine has a wide ecological and spatial plasticity: colonization of all substrates, bioclimates ranging from semi-arid to temperate humid. It’s a species that exhibits uniform behavior despite topographic and edaphic variations.

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.

Effects of diameter distribution on the growth of simulated uneven-aged sugar maple stands

1987 ◽  
Vol 17 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Gerald D. Hansen ◽  
Ralph D. Nyland
Keyword(s):  
Sugar Maple ◽  
Basal Area ◽  
Tree Size ◽  
Diameter Distribution ◽  
Computer Simulation Model ◽  
Maximum Volume ◽  
Size Classes ◽  
Management Objectives ◽  
Stress Maximum ◽  
Volume Production

Effects of diameter distribution on the growth of simulated uneven-aged sugar maple (Acersaccharum Marsh.) stands are described using output from a computer simulation model. Results indicate that the combination of q ratio (a constant ratio between the numbers of trees present in adjacent diameters over the entire range of size classes present), maximum tree size, and basal area should vary depending on management objectives and cutting cycle length. A ratio of 1.2 appears best for describing a diameter distribution to maximize growth of large sawtimber, but larger q ratios are needed in the sapling and pole size classes to insure sufficient numbers of trees to sustain the distribution through the end of a cutting cycle. Retaining trees larger than a 40 cm diameter at breast height offers no advantage when objectives stress maximum volume production. A 50 cm maximum tree size appears better suited for maximizing large sawtimber volume and value growth, but a 40 cm maximum will yield a better compound rate of return on initial stand value. Under all options, longer cutting cycles require lower initial basal area levels.

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