pdf variation in the tracheid dimensions of scots in south africa

Just fill in the form below, click submit, you will get the price list, and we will contact you within one working day. Please also feel free to contact us via email or phone. (* is required).

  • Radial variation in tracheid lengths in dominant trees

    2021-6-2 · Abstract. The radial variation was examined for tracheid lengths of Norway spruce (Picea abies (L.) Karst.), European larch (Larix decidua Mill.), and Scots pine (Pinus sylvestris L.) wood from dominant trees coming from an even-aged stand, and growing under identical forest site and climatic conditions.The measurements were completed on macerated material.

    Get Price
  • Variation in Wood and Tracheid Properties of Pinus ...

    1991-1-1 · pdf Cited By Wood density, latewood percentage, ring width and the cross sectional dimensions of tracheids (wall thickness, lumen area, radial and tangential lumen diameters) were evaluated from ten-year-old trees of Pinus maximinoi H.E. Moore, P. pseudostrobus Lindley and P. patula Schiede ' Deppe grown in South Africa.

    Get Price
  • Models for predicting microfibril angle variation in

    2012-11-6 · Microfibril angle (MFA) is one of the key determinants of solid timber performance due to its strong influence on the stiffness, strength, shrinkage properties and dimensional stability of wood. The aim of this study was to develop a model for predicting MFA variation in plantation-grown Scots pine (Pinus sylvestris L). A specific objective was to quantify the additional influence of growth ...

    Get Price
  • Pine and larch tracheids capture seasonal variations of ...

    2018-10-15 · Key message Although the radial diameter and wall thickness of conifer tracheids from dry environments are climatic-sensitive across the full ring area, each cell parameter has a specific zone in a ring where its climatic response reaches the maximum. Abstract Seasonal dynamics of the timing and rate in cell production and differentiation imprint climate signals into intra-ring variations of ...

    Get Price
  • Intra-annual tracheid formation of Norway spruce ...

    2011-9-7 · We studied the intra-annual wood formation in a Norway spruce provenance experiment in southern Finland from 2004–2008. Two Finnish provenances, northern and southern, as well as German and Hungarian provenances were included. Timing of tracheid formation and differentiation, and tracheid dimensions were determined from periodically extracted microcores.

    Get Price
  • Within-canopy variation in needle morphology and

    2015-5-19 · Azimuthal sides of the canopy affected neither needle morphology nor vascular anatomy. However, a significance was found to be associated with canopy height. The needle morphological and anatomical parameters of vascular tissues were scaled up to the forest stand level. In conifers the needle is the key organ for photosynthesis and transpiration, and these two processes are influenced by the ...

    Get Price
  • Dynamics of diameter and height increment of

    2018-3-8 · Onset and cessation of radial and height increment of Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) in southern Finland were independent phenomena. They both contributed to the increment period duration, which was a more crucial factor defining the magnitude of annual radial and height increment. Phenology of diameter and height increment is a critical …

    Get Price
  • Genetic control of tracheid properties in Norway

    2020-10-22 · Several papers have reported the phenotypic correlations, between tracheid cross-sectional dimensions and wood traits such as density in conifers 4,5,6. A study of Norway spruce felled in the ...

    Get Price
  • Axial variability of anatomical structure and the scaling ...

    2021-1-1 · Scots pine is one of the most wide-ranging trees, exhibiting remarkable geographic variation of needle length (Pravdin, 1969; Ruby and Wright, 1976; Jankowski et al., 2017). This diverse range of foliar phenotypes may be explored to test the universality of within-leaf anatomical allometry in the context of environmental adaptation.

    Get Price
  • Optimizing cell-anatomical chronologies of Scots pine

    2014-1-1 · Scots pine samples were collected in 2009 (KF), 2011 (VN) and 2012 (SF). The wood samples at KF and VN were taken by an increment borer (Ø 5.2 mm) at 1.4 m above the ground and at SF as a disk at ca. 0.9 m above the peatland surface.The number of tree rings at KF, VN and SF are 123, 184 and 39 years, respectively.

    Get Price
  • (PDF) Hydraulic adjustment of Scots pine across

    Hydraulic adjustment of Scots pine across Europe. New Phytologist, 2009. Ute Sass-Klaassen

    Get Price
  • (PDF) Trace - Tree Rings in Archaeology, Climatology

    Download Free PDF. Download Free PDF. Trace - Tree Rings in Archaeology, Climatology and Ecology. Volume 5. Kristof Haneca. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.

    Get Price
  • MICROSTRUCTURAL AND PHYSICAL ASPECTS OF

    (1 South Africa and New Zealand grown radiata pine with cross section sizes only containing sapwood ) In Scots pine, radial cracks were noticed starting in the earlywood section (Fig. 3a). The tracheids were cleaved but the cell walls seemed still intact, whereas the …

    Get Price
  • Forests | Free Full-Text | Mechanical Properties of ...

    This article presents the results of tests conducted on Scots pine timber from three different kinds of logs: butt, middle and top. A planed pine timber batch composed of 510 pieces, dried to ca. 12% humidity, was machine-graded using a portable MTG device, and classified into the following classes: C18, C24, C30, C35 and C40 (according to EN 338:2016). During the second stage of the study ...

    Get Price
  • Physical and mechanical properties of wood and their ...

    2020-7-31 · Physical and mechanical properties of wood. The AD values in the five provenances ranged from 0.62 to 0.68 g/cm 3, while the OD values ranged from 0.58 to 0.65 g/cm 3 …

    Get Price
  • Biological Flora of the British Isles: Juniperus

    Juniperus communis ssp. hemisphaerica is found mainly in mountainous areas of south Europe and north-west Africa and in the UK is, according to Preston et al. (2002), confined to two tiny populations on low maritime cliffs on the Lizard Peninsula, Cornwall, and in Pembrokeshire.

    Get Price
  • Studying global change through investigation of the ...

    2009-9-23 · South Africa: Mean annual P (July to June) Pumijumnong & Park (1999) Tectona grandis: Mean vessel area and diameter, conductive area and vessel density: 1947–1996 Southeast Asia: Different climatic parameters (T and P) St George et al. Quercus macrocarpa: Early wood vessel size: 1884–2000 Floodplain, Manitoba, Canada: Flooding event

    Get Price
  • Influence of environmental factors on the wood

    The mechanism of wood development records in varying degree the effects of both external and internal factors that are operating at the time of development. As a result, fossil woods spanning the last 370 million years represent a unique palaeo-environmental data-store. Data concerning external factors that can be reclaimed consist of: presence or absence of growth rings; ring widths; relative ...

    Get Price
  • A global Fine‐Root Ecology Database to address

    2017-2-28 · The identification of central dimensions of an RES and other independent axes of variation would represent a substantial advance to the field of below-ground ecology. The evaluation of an RES can take advantage of FRED's capacity to differentiate among root orders and to examine multiple root traits and trait tradeoffs simultaneously.

    Get Price
  • Forests | Free Full-Text | Wood and Fiber Quality of ...

    With conifer plantations having an increasingly important role in meeting the fiber needs of society, an understanding of the effect of silvicultural practices on wood quality is critical. The perception of wood quality varies, making it hard to define in a single statement; however, possibly the most succinct definition is “a measure of the aptness of wood for a given use”.

    Get Price
  • MICROSTRUCTURAL AND PHYSICAL ASPECTS OF

    (1 South Africa and New Zealand grown radiata pine with cross section sizes only containing sapwood ) In Scots pine, radial cracks were noticed starting in the earlywood section (Fig. 3a). The tracheids were cleaved but the cell walls seemed still intact, whereas the …

    Get Price
  • Silva Fennica vol. 51

    In Scots pine (Pinus sylvestris L.), it has been shown that the parental conditions have a role in the phenological variation among first-year seedlings.For this reason, it is argued that they should be comprehensively controlled before estimating the parental genotype effects. This controlled-cross study examined the effects of a set of fathers of Scots pines on the timing of budset and ...

    Get Price
  • effect of planting spacing on Pinus patula stem ...

    Introduction. Of all sawn wood produced and sold in South Africa, ~75 per cent is regarded as structural lumber (Crickmay and Associates, 2015), making it the single most important product category for local sawmills.The most important tree resource for these lumber processors is Pinus patula, which accounts for 52.2 per cent of the total softwood area in South Africa ().

    Get Price
  • Fajstavr M, Paschová Z, Giagli K, Vavrčík H, Gryc V,

    2018-9-1 · Growing season water balance of an inner alpine Scots pine (Pinus sylvestris L.) forest. Wieser G, Gruber A, Oberhuber W. vol. 11, pp. 469-475 (online: 02 July 2018) Research Articles. Use of δ 13 C as water stress indicator and potential silvicultural decision support tool in Pinus radiata stand management in South Africa. Fischer PM, du Toit B

    Get Price
  • Forests | Free Full-Text | Wood and Fiber Quality of ...

    With conifer plantations having an increasingly important role in meeting the fiber needs of society, an understanding of the effect of silvicultural practices on wood quality is critical. The perception of wood quality varies, making it hard to define in a single statement; however, possibly the most succinct definition is “a measure of the aptness of wood for a given use”.

    Get Price
  • Functional relationships between wood structure and ...

    where T is the tension (considered as equal in absolute value to the positive pressure applied in the cavitation chamber), b is the Weibull scale parameter and c is the Weibull shape parameter. Usual parameters like P 50, P 12 and P 88 (that is, pressure inducing 50%, 12% and 88% losses of hydraulic conductivity) and the slope between P 12 and P 88 of each VC curve (which denotes how fast ...

    Get Price
  • ESSD - Global transpiration data from sap flow ...

    2021-6-14 · Abstract. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, and carbon budgets at the land–atmosphere interface. However, despite being the main land evaporative flux at the global scale, transpiration and its response to environmental drivers are currently not well constrained by observations.

    Get Price
  • American Journal of Botany - Wiley

    2011-9-1 · Variation for wood density in the genus was rarely correlated with variation in climate (Figs. 1 and 2) or with variation in functional traits other than plant biomass . It is possible that wood density in Pinus seedlings was low and not associated with climate because plants were grown in a greenhouse environment rather than in the field.

    Get Price
  • Microanalytical techniques for phenotyping secondary

    2020-7-28 · Light microscopy, fluorescence microscopy, confocal laser scanning microscopy, transmission electron microscopy and Raman spectroscopy serve as dual micro morphotyping and chemotyping techniques. In this review, we summarise and discuss these techniques in the light of their applicability as microanalytical techniques to study secondary xylem.

    Get Price
  • 04_bibliography.pdf | Spruce | Pinophyta - Scribd

    2019-10-14 · Scribd es el sitio social de lectura y editoriales más grande del mundo.

    Get Price
  • Variation in wood physical properties and effects of ...

    2021-2-25 · Variation in wood density. The values of Chinese fir’s wood physical properties varied considerably among different geographic sources and Tukey-HSD testing showed that …

    Get Price
  • Types of Wood: Guide to Choose the Best for Your

    Tracheid content is around just 5% to 10%. Tracheid content is around 90% to 95%. 5: The complex anatomical structure makes hardwood denser. The relatively less complex anatomical structure makes softwood less dense. 6: Not all types of hardwood are ideal for furniture making. Being expensive, they are usually used in high-end furniture ...

    Get Price
  • Microanalytical techniques for phenotyping secondary

    2020-7-28 · Light microscopy, fluorescence microscopy, confocal laser scanning microscopy, transmission electron microscopy and Raman spectroscopy serve as dual micro morphotyping and chemotyping techniques. In this review, we summarise and discuss these techniques in the light of their applicability as microanalytical techniques to study secondary xylem.

    Get Price
  • 04_bibliography.pdf | Spruce | Pinophyta - Scribd

    2019-10-14 · Scribd es el sitio social de lectura y editoriales más grande del mundo.

    Get Price
  • Best Practice for Tree Breeding in Europe - PDF Free

    The genetic variation of Scots pine in Scandinavia is clinal by latitude as an adaptation to climate. The response is to photoperiod resulting in a large-scale GxE interaction over a north-south gradient. Genetic variation is substantial for all characteristics and mainly additive, although heritabilities in general are low.

    Get Price
  • Trees: Their Natural History - SILO.PUB

    Such change in dimensions is significant even over the normal temperatures and humidities expected over a year. For example, the pattern used for shaping the mould for the 16–17 t anchor heads of the cruise ship QEII is made of pine and the shrinkage between winter and summer (0.5–1.0%) makes a difference of 2–3 hundredweight (100–150 ...

    Get Price
  • BG - Metrics - Recent trends and drivers of regional ...

    2015-2-4 · Distinguishing the drivers of trends in land carbon fluxes and plant volatile emissions over the past 3 decades X. Yue et al. 10.5194/acp-15-11931-2015. Reviews and syntheses: Carbonyl sulfide as a multi-scale tracer for carbon and water cycles M. Whelan et al. 10.5194/bg-15-3625-2018.

    Get Price
  • WSL > index_EN

    2021-5-25 · Variation in wood anatomical structure of Douglas-fir defoliated by the western spruce budworm: A case study in the coastal-transitional zone of British Columbia, Canada. Trees, 28 , 1837-1846. doi: 10.1007/s00468-014-1091-1 ( pdf )

    Get Price
  • Báo cáo khao học: 'High-resolution analysis of radial ...

    Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: High-resolution analysis of radial growth and wood density in Eucalyptus nitens, grown under...

    Get Price
  • Fajstavr M, Paschová Z, Giagli K, Vavrčík H, Gryc V,

    Abstract: The metabolic activity of phytohormones and the accumulation of carbohydrates affect the reactivation of the cambial zone and the radial increment of woody plants. We aimed to monitor the dynamics of indole-3-acetic acid (IAA) concentration and amounts of soluble carbohydrates during xylem and phloem formation of one growing season (2015).

    Get Price
  • High-resolution analysis of radial growth and wood

    2002-5-9 · Evans R., Rapid measurement of the transverse dimensions of tracheids in radial wood sections from Pinus radiata, Holzforschung 48 (1994) 168-172. Evans R., Downes G.M., Menz D., Stringer S., Rapid measurement of variation in tracheid transverse dimensions in a radiata pine, Appita J. 48 (1995) 134-138.

    Get Price
  • Table of Contents of Presentations

    2012-10-25 · 1 Table of Contents of Presentations KEY: GT = Papers in Global Trade Session EC = Papers in Energy and Carbon Session BAF = Papers in Bamboo and Agri Fibers Session SRF = Papers in Sustainable Resources for the Future Session AP1 = Papers in Advanced Processing I Session AP2 = Papers in Advanced Processing II Session WAFC= Papers in Wood and Agri Fiber Culture Session

    Get Price
  • Timber, its nature and behaviour | J.M. Dinwoodie OBE ...

    File: PDF, 2.63 MB. fTimber Its nature and behaviour ffTimber Its nature and behaviour Second edition J.M.Dinwoodie, OBE Building Research Establishment, and Honorary Professor, University of Wales with the support of the Centre for Timber Technology and London and New York Construction at BRE fFirst published 1981 by Van Nostrand Reinhold Co ...

    Get Price
  • WSL > index_EN

    2021-5-25 · Variation in wood anatomical structure of Douglas-fir defoliated by the western spruce budworm: A case study in the coastal-transitional zone of British Columbia, Canada. Trees, 28 , 1837-1846. doi: 10.1007/s00468-014-1091-1 ( pdf )

    Get Price
  • Trees: Their Natural History - SILO.PUB

    2018-7-25 · Juli LB - pres00 PB - Pressetext, Austria PY - 2000 ST - Verschwinden der Amphibien hat viele Ursachen TI - Verschwinden der Amphibien hat viele Ursachen ID - 27 ER - TY - CHAP A2 - Christensen, J. A2 - Hulme, M. A2 - von Storch, Hans A2 - Jones, R. A2 - Mearns, L. A2 - Fu, C. LB - ipcc2001a PB - Cambridge University Press PY - 2001 ST ...

    Get Price
  • Frontiers | Effects of Recent Minimum Temperature

    Such change in dimensions is significant even over the normal temperatures and humidities expected over a year. For example, the pattern used for shaping the mould for the 16–17 t anchor heads of the cruise ship QEII is made of pine and the shrinkage between winter and summer (0.5–1.0%) makes a difference of 2–3 hundredweight (100–150 ...

    Get Price
  • John C.F. Walker - Primary Wood Processing_

    2016-8-12 · The variation in density in hardwoods is to some extent linked to wood growth rate as well as wood fibers and vessel dimensions. In the case of gymnosperm softwoods and the pine gender Pinus sp in particular, lower densities are a result of a higher proportion of tracheids with a larger extend of cavities where the amount of cell wall material ...

    Get Price
  • R. Bruce Hoadley Identifying Wood Accurate Results

    2020-5-27 · Variation in percentage of acetone extractives (oven-dry wood basis) with position in a 40 yr-old radiata pine tree (Uprichard and Lloyd, 1980), i.e. there is a higher extractive content near the pith at the base of the tree (the samples with more growth rings).

    Get Price
  • 04_bibliography.pdf | Spruce | Pinophyta - Scribd

    Among coniferous woods, tracheid diameter provides a basis for judging the coarseness or fineness of the wood's texture. The larger the tracheid diameter, the coarser the texture. Table 3.1 lists typical tracheid diameters for various conifers, and enables you to correlate the texture of a sample with a certain group of softwoods. f--+1f-f----

    Get Price