scholarly journals Comparison of the Growth of SixEucalyptusSpecies in Angola

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Cristobal Delgado-Matas ◽  
Timo Pukkala
Keyword(s):  
Species Introduction ◽  
Annual Increment ◽  
Eucalyptus Saligna ◽  
Stand Volume ◽  
X Ray ◽  
Optimal Rotation ◽  
The Mean ◽  
Introduction Experiment ◽  
Mean Annual Increment ◽  
Stand Characteristics

Eucalyptusspecies have been planted in Angola since the early twentieth century. The species introduction experiment of Tchianga, in the Angolan Highlands, was established in 1966/1967. The experiment included several tropical pines and eucalypts. The plots were 43 years old when measured in 2009. Species includedEucalyptus salignaSm.,E. camaldulensisDehnh.,E. macarthuriiH. Deane & Maiden,E. resiniferaSm.,E. siderophloiaBenth., andE. grandisHill ex. Maiden.E. salignahad the highest stand volume at 43 years (1427 m3 ha−1), followed byE. grandis(1006 m3 ha−1).E. macarthuriiandE. camaldulensishad the lowest stand volume (423 and 511 m3 ha−1, resp.). Using X-ray analyses of increment cores, it was possible to study the temporal development of the stand characteristics. An analysis of the mean annual increment showed that the optimal rotation length for most of the studied eucalypts is around 22 years with the exception ofE. resinifera, for which 12–15 years is the best.E. salignahad the highest maximum mean annual increment (MMAI) of 37 m3 ha−1attained at 22 years of age.E. grandisreached its MMAI of 25 m3 ha−1at 28 years. The results suggest thatE. salignais the most recommendedEucalyptusspecies for new plantations in Angola.

Actual and projected growth and yields of Populus 'Tristis #1' under intensive culture

1976 ◽  
Vol 6 (2) ◽  
pp. 132-144 ◽  
Author(s):  
Alan R. Ek ◽  
David H. Dawson
Keyword(s):  
Simulation Model ◽  
Tree Growth ◽  
Dry Weight ◽  
Intensive Culture ◽  
Annual Increment ◽  
Growth Simulation ◽  
Stand Growth ◽  
Mean Annual Increment ◽  
Stand Characteristics ◽  
Branch Wood

Yields and related stand characteristics of Populus 'Tristis #1' cuttings based on 4 years of growth under intensive culture (fertilization and irrigation) at square spacings of 0.75, 1, and 2 ft (0.23, 0.30 and 0.61 m) in northern Wisconsin are reported. Stem and branch wood yields were 40 390, 45 132, and 27 567 lb/acre (45 272, 50 586, and 30 899 kg/ha) for these spacings, and current annual increment peaked at age 3 for the 0.75- and 1-ft spacings. Tree growth and competition information from these plots was then used to calibrate a stand growth simulation model to develop yield projections to the 10- to 25-year range for the above plus 4-, 8-, and 12.7-ft (1.22-, 2.44-, and 3.87-m) spacings. Mean annual increment in terms of stem and branch wood dry weight for the projections peaked at about 8–15 years for all six spacings with values in the range of 13 881 – 16 584 lb/acre (15 559 – 18 588 kg/ha), respectively. The maximum mean annual increment was obtained at age 15 with a 4-ft spacing. Results further indicate substantial product-oriented flexibility in the choice of spacings and rotation ages since curves of mean annual increment are both similar and relatively flat in the 10- to 20-year range, except for the two widest spacings. A discussion of stand model projection methodology, reliability, and limitations is presented along with suggestions for more refined projections.

scholarly journals Gross value yield potential of coppice, high forest and model conversion of high forest to coppice on best sites

2011 ◽  
Vol 57 (No. 12) ◽  
pp. 536-546 ◽  
Author(s):  
M. Kneifl ◽  
J. Kadavý ◽  
R. Knott
Keyword(s):  
Czech Republic ◽  
The Other ◽  
Yield Potential ◽  
Fuel Wood ◽  
Annual Increment ◽  
Site Class ◽  
The Czech Republic ◽  
The Mean ◽  
Model Conversion ◽  
Mean Annual Increment

 Based on yield tables for oak high forest and oak coppice (both first site class) and using assortment tables and assortment prices in the Czech Republic in 2009, a set of variants of conversion of high forest to coppice was simulated. Average annual cut and average gross value of annual cut of such conversions were compared with those of well-established (in terms of the age structure balance) variants of coppice and high forest. Under the existing ratio of assortment prices, established coppice does not reach the gross value yield of high forest. No variant of simulated conversions was more financially profitable than the initial high forest. Furthermore, we found out that a +16.8% increase of the current fuel wood price would counterbalance the mean annual increment of gross value of the best coppice and the worst oak high forest variant. On the other hand, a +164.7% fuel wood price increase would be necessary to counterbalance the mean annual increment of gross value of the worst coppice and the best high forest variants.  

scholarly journals Limits to CO2-Neutrality of Burning Wood. (Review)

2016 ◽  
Vol 53 (4) ◽  
pp. 48-55
Author(s):  
J. Abolins ◽  
J. Gravitis
Keyword(s):  
Ecological Footprint ◽  
Biomass Accumulation ◽  
Richards Equation ◽  
Forest Land ◽  
Land Area ◽  
Annual Increment ◽  
Excess Amount ◽  
The Mean ◽  
Mean Annual Increment ◽  
Fire Wood

Abstract Consumption of wood as a source of energy is discussed with respect to efficiency and restraints to ensure sustainability of the environment on the grounds of a simple analytical model describing dynamics of biomass accumulation in forest stands – a particular case of the well-known empirical Richards’ equation. Amounts of wood harvested under conditions of maximum productivity of forest land are presented in units normalised with respect to the maximum of the mean annual increment and used to determine the limits of CO2-neutrality. The ecological “footprint” defined by the area of growing stands necessary to absorb the excess amount of CO2 annually released from burning biomass is shown to be equal to the land area of a plantation providing sustainable supply of fire-wood.

scholarly journals PERTUMBUHAN AWAL TITI (Gmelina moluccana)

2020 ◽  
Vol 4 (2) ◽  
pp. 122-131
Author(s):  
Febian. F. Tetelay ◽  
Lily Pelupessy ◽  
Yacob Rahayaan ◽  
Bronie S Serlaloy ◽  
Hein A. Nimreskossu ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Environmental Factors ◽  
Plant Height ◽  
Soil Ph ◽  
Regression Equations ◽  
Growth Data ◽  
Annual Increment ◽  
The Mean ◽  
Mean Annual Increment ◽  
Sunlight Intensity

Titi or Gmelina moluccana is a type of the Lamiaceae family that grows in Maluku. Although this species is local, there is still very little information about its growth. This study aims to determine the growth of this species from planting in the field until the sixth year, environmental factors that affect its growth. Data collected in the form of plant height and diameter, air temperature, humidity, soil pH, soil moisture, sunlight intensity. Environmental factors are then related to plant height and diameter to determine environmental factors that affect the growth of these plants through multiple linear regression equations. Besides, the mean annual  increment and the current annual increment is also calculated to determine the cycle of this plant. Based on the results of research, Titi plants up to the sixth year have an men annual increment and the current annual increment is 0.99 meters/year and 1.46 meters for height and 1.62 cm/year and 2.50 cm for diameter. Until the sixth year this species has not entered the techniquecycle, while for woodworking purposes, this species can be harvested at the age of 24.5 years. Environmental factors that affect the growth of Titi are soil pH and soil moisture.

Yield and Wood Properties of 25-year-old Japanese Larch of Different Provenance in Eastern Canada

1988 ◽  
Vol 64 (6) ◽  
pp. 475-479 ◽  
Author(s):  
D. P. Fowler ◽  
J. D. Simpson ◽  
Y. S. Park ◽  
M. H. Schneider
Keyword(s):  
Wood Properties ◽  
Japanese Larch ◽  
European Larch ◽  
Annual Increment ◽  
Eastern Canada ◽  
Yield Data ◽  
Old Japanese ◽  
The Mean ◽  
Pattern Of Variation ◽  
Mean Annual Increment

Yield data from a 25-year-old trial of Japanese larch (20 provenances), European larch (3 provenances) and tamarack (2 provenances) are presented. Japanese larch is genetically variable in volume of wood produced at age 25 years. The pattern of variation is not closely related to any commonly measured geographic or environmental variables.Japanese larch, managed over short rotations, is capable of producing two to three times more wood than other conifer species commonly planted in the Maritimes Region of Canada. The mean annual increment of merchantable wood for trees of the three best provenances at age 25 years is about 12 m3/ha per year, while that of the poorest provenance is about the same as for European larch and tamarack, 4 m3/ha per year. Japanese larch wood sawed, dried and machined well. It appears suited for general construction use and may be eligible for a stress grade.

scholarly journals Productive potential of Tectona grandis in Midwest Brazil

2019 ◽  
Vol 6 (4) ◽  
pp. 803
Author(s):  
Reginaldo Antonio Medeiros ◽  
Haroldo Nogueira de Paiva ◽  
Álvaro Augusto Vieira Soares ◽  
Gustavo Eduardo Marcatti ◽  
Fausto Hissahi Takizawa ◽  
...  
Keyword(s):  
Neural Networks ◽  
Tectona Grandis ◽  
Estimation Accuracy ◽  
Annual Increment ◽  
Mato Grosso ◽  
Productive Potential ◽  
The Mean ◽  
Teak Plantations ◽  
Production Areas ◽  
Mean Annual Increment

This study aimed to assess the productive potential of teak plantations in the state of Mato Grosso, Midwest Brazil. We modeled the mean annual increment at the age of 12 years (MAI12) as a function of climatic, edaphic and physiographic variables using artificial neural networks (ANN). The ANNs were shown effective in modeling the mean annual increment, despite of some inconsistences found for areas for which part of the environmental information was not available. The greatest proportion of the land covered by our study (62%) presented moderate productivity, ranging from 10.24 m3 ha-1 year-1 to 28.76 m3 ha‑1 year‑1 MAI12. The highest (MAI12 > 28.76 m3 ha-1 year-1) and the lowest (MAI12 < 10.24 m3 ha‑1 year‑1) productivity areas accounted for 18% and 20% of the study area, respectively. Studies comprising a more comprehensive coverage of the teak production areas are encouraged in order to improve estimation accuracy.

scholarly journals Effect of soil type on mean annual increment, wood anatomy and properties of 33-year-old Corymbia citriodora (Hook.), K. D. Hill, & L. A. S. Johnson

2021 ◽  
Vol 10 (10) ◽  
pp. e558101019004
Author(s):  
Willyam de Lima Vieira ◽  
Erick Phelipe Amorim ◽  
Caio Corsato Correa ◽  
Fabio Minoru Yamaji ◽  
Miguel Luiz Menezes Freitas ◽  
...  
Keyword(s):  
Tree Growth ◽  
Water Availability ◽  
Annual Increment ◽  
The Mean ◽  
Fiber Cell Wall ◽  
Red Latosol ◽  
Corymbia Citriodora ◽  
Mean Annual Increment ◽  
Water Holding ◽  
Physical And Mechanical Characteristics

This study aimed to determine the effects of physical, chemical and water-holding capacity of Quartzarenic Neosol, Red Latosol and Red Nitosol on tree growth, physicomechanical properties and anatomical features of wood from 33-year-old C. citriodora plantations. More clayey soils with higher water availability, such as Red Latosol and Red Nitosol, increased the mean annual increment and heartwood percentage. In more sandy soils, such as Quartzarenic Neosol, density increased, but the size and diameter of fibers and vessels decreased, and both fiber cell wall thickness and frequency of vessels and rays increased. Wood shrinkage and mechanical properties did not differ between soils. We observed a gradual increase in the anatomical, physical and mechanical characteristics in the pith-bark direction. The uniformity index showed that Quartzarenic Neosol and Red Latosol soils produced more homogeneous woods. We concluded that soil texture and water availability influenced tree growth, anatomical properties and wood density.

scholarly journals Introduction of suitable species for planting in gaps of different size (case study: Loveh forest, Golestan, Iran)

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 9-15
Author(s):  
Parhizkar Pejman ◽  
Sagheb-Talebi Khosro ◽  
Shahini Yaser ◽  
Teimouri Maryam
Keyword(s):  
Soil Surface ◽  
Medium Size ◽  
Annual Increment ◽  
Significant Difference ◽  
Quantitative Characteristics ◽  
North Of Iran ◽  
Collar Diameter ◽  
The Mean ◽  
Mean Annual Increment

This study was carried out in Loveh forest, north of Iran. We measured the quantitative characteristics of seedlings including collar diameter (measured at 1 cm above the soil surface), height, and current annual height increment and calculated the mean annual increments of height and diameter. Ten gaps with the same climatic, edaphic and topographic conditions were selected. In each gap, two transects, 2 m wide, were laid along the longest (North-South) and the shortest (West-East) axis. Nine sampling microplots, 4 m<sup>2</sup> area, were established: one at the centre, four at the edges and four under the canopy within the transects. Results showed that the highest frequency of seedlings was seen in medium-size gaps (200–500 m<sup>2</sup>). Quantitative characteristics of oak seedlings were better in small and medium-size gaps. There was a significant difference in the length of spring shoots, mean annual increment of height and mean annual increment of diameter between the species. Hornbeam, wild service and wild cherry seedlings are recommended for faster gap recovery, as the results showed that these species had the highest values of studied variables.

Radial variation of vessel lumen diameter in relation to stem increment in 30 hardwood species

IAWA Journal ◽  
2009 ◽  
Vol 30 (3) ◽  
pp. 331-342 ◽  
Author(s):  
Ryouta Tsuchiya ◽  
Ikuo Furukawa
Keyword(s):  
Stem Growth ◽  
Lumen Diameter ◽  
Type I ◽  
Annual Increment ◽  
Vessel Lumen ◽  
Hardwood Species ◽  
The Mean ◽  
Mean Annual Increment ◽  
Maturation Age ◽  
Stem Increment

Vessel lumen diameter (VLD) is one of the most important anatomical indicators for demarcating juvenile wood and mature wood in hardwoods. In several species, we previously found that the age at which VLD stabilizes (maturation age) and the age at which the mean annual increment in radial stem growth was maximal were approximately the same. In the current study, we investigated the extent to which this relationship is true for 30 species of hardwoods. We found that two types of relation exist between the maturation age of VLD and radial stem growth, i.e., the type in which the maturation age of VLD was similar to the age at which the current annual increment was maximal (Type-I), and the other type in which the maturation age of VLD was similar to the age at which the mean annual increment was maximal (Type-II). Where more than one species was studied for a given genus, the type was shared. Porosity (ring- or diffuse-porous) is not related with maturation type.

scholarly journals L'état actuel des vieilles sapinières à Hylocomium à la forêt Montmorency de l'Université Laval

1969 ◽  
Vol 45 (1) ◽  
pp. 18-21
Author(s):  
Gilbert Paille
Keyword(s):  
Quality Index ◽  
Basal Area ◽  
Balsam Fir ◽  
Natural Mortality ◽  
Annual Increment ◽  
Site Class ◽  
Site Type ◽  
The Mean ◽  
Mean Annual Increment ◽  
Final Cutting

The present status of old balsam fir stands (Hylocomium-Oxalis site-type) has been studied on sites of second quality (index of 40 feet at 50 years) by means of 1/5-acre random sample plots. Comparisons with normal yield tables indicate that, between the age of 70 and 90 years, these stands show 1) too many stems per acre, mainly due to abundant ingrowth, 2) a constant average stand, d.b.h., 3) a loss of 30 sq.ft. per acre of basal area, and 4) a reduction of the mean annual increment in merchantable volume from 33 to 22 cu.ft. per acre.It is concluded that these site class II balsam fir stands are already mature, rapidly deteriorating, and failing to occupy the station fully. Consequently, they should be managed on rotations shorter than 70 years. Thinnings might be conducted 15 years before the final cutting to salvage otherwise heavy losses by natural mortality.

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