The effects of thinning treatments on density, MOE, MOR and maximum crushing strength of Pinus brutia Ten. wood

The purpose of this study was to determine the effects of plantation thinning on various wood properties of Pinus brutia Ten. Tree samples were obtained from heavily and moderately thinned and unthinned 33–35 year-old plantations. Wood properties were examined in various wood zones including 16 annual rings after the first treatment. The results of this study showed that there was a significant relationship between thinning intensity and radial increment (1.30 m) for an individual tree. Thinning treatments increased annual ring width especially a few years after thinning. Heavy thinning treatments were especially effective in impacting mean ring width values at breast height. However, the percentage of late wood did not differ much between the samples. Based on the results of correlation analysis between ring width and late wood percentage there was no significant correlation identified. Mean wood density was not affected by the treatments. Also, no significant correlation was found between thinning and examined strength properties (MOR, MOE and compression strength parallel to grain). However, a relationship was found between wood density and all strength properties except for MOE. The current results suggest that thinning can produce improvements in ring width without any negative impacts on investigated wood properties. It is recommended that subsequent studies should be designed to understand genetic effects and maximize treatment effects.

[1]  R. G. Pearson,et al.  Growth rate and bending properties of selected loblolly pines , 2007 .

[2]  D. D. McRae,et al.  Density And Growth Ring Characteristics Of Pinus Taeda L. Following Thinning , 2007 .

[3]  B. Kučera.  A hypothesis relating current annual height increment to juvenile wood formation in Norway spruce , 2007 .

[4]  Song-Yung Wang,et al.  Effects of moisture content and specific gravity on static bending properties and hardness of six wood species , 1999, Journal of Wood Science.

[5]  Y. Kijidani,et al.  Effects of Basic Wood Properties on Strength and Stiffness in Bending of Cryptomeria japonica Timbers , 2005 .

[6]  S. Zhang.  Effect of growth rate on wood specific gravity and selected mechanical properties in individual species from distinct wood categories , 1995, Wood Science and Technology.

[7]  A. Harrison,et al.  Douglas-fir wood quality studies part I: Effects of age and stimulated growth on wood density and anatomy , 1974, Wood Science and Technology.

[8]  T. Stanger.  Variation and Genetic Control of Wood Properties in the Juvenile Core of Pinus patula Grown in South Africa. , 2003 .

[9]  R. Gundogan,et al.  Relationship between site index and several mechanical properties of Turkish calabrian pine (Pinus brutia Ten.) , 2003 .

[10]  E. Macdonald,et al.  A review of the effects of silviculture on timber quality of Sitka spruce , 2002 .

[11]  S. Zhang,et al.  Relationships between wood density and annual growth rate components in balsam fir (Abies balsamea) , 2002 .

[12]  T. Wodzicki.  Natural factors affecting wood structure , 2001, Wood Science and Technology.

[13]  A. H. Buchanan,et al.  Selecting trees for structural timber , 2000, Holz als Roh- und Werkstoff.

[14]  J. Oliver-Villanueva,et al.  Effect of silvicultural management on wood quality and timber utilisation of Cedrus atlantica in the European mediterranean area , 2000, Holz als Roh- und Werkstoff.

[15]  Á. N. Dhubháin,et al.  A comparison of mechanical and physical wood properties: of a range of Sitka spruce provenances. , 2000 .

[16]  R. Pape.  Influence of Thinning and Tree Diameter Class on the Development of Basic Density and Annual Ring Width in Picea abies , 1999 .

[17]  E. Valinger,et al.  Effects of Fertilization and Thinning on Heartwood Area, Sapwood Area and Growth in Scots Pine , 1999 .

[18]  Björn Hannrup,et al.  Age-age correlations for tracheid length and wood density in Pinus sylvestris , 1998 .

[19]  K. Oda,et al.  Effect of Thinning on the Wood Structure in Annual Growth Rings of Japanese Larch (Larix Leptolepis) , 1997 .

[20]  K. Oda,et al.  Effects of thinning on basic density and tracheid length of karamatsu (Larix leptolepis) , 1996 .

[21]  A. H. Buchanan,et al.  A comparison of density and stiffness for predicting wood quality or Density: the lazy man's guide to wood quality. , 1995 .

[22]  R. Barbour,et al.  Breast height relative density and radial growth in mature Jack pine (Pinus banksiana) for 38 years after thinning , 1994 .

[23]  J. C. F. Walker,et al.  Stiffness of wood in fast-grown plantation softwoods: the influence of microfibril angle. , 1994 .

[24]  B. Zobel.  SILVICULTURAL EFFECTS ON WOOD PROPERTIES , 1992 .

[25]  E. Valinger,et al.  Effects of wind sway on stem form and crown development of Scots pine (Pinus sylvestris L.) , 1992 .

[26]  G. Berlyn,et al.  Botanical Microtechnique and Cytochemistry , 1991 .

[27]  Marc H. Schneider,et al.  Forest products and wood science , 1990 .

[28]  J. E. Shottafer,et al.  Effect of early release on specific gravity and wood yield of black spruce , 1990 .

[29]  D. Weldon,et al.  Comparison of grade, yield, and mechanical properties of lumber produced from young fast-grown and older slow-grown planted slash pine , 1990 .

[30]  H. Brix,et al.  The effects of fertilization and thinning on wood quality of a 24-year-old Douglas-fir stand , 1989 .

[31]  Bruce J. Zobel,et al.  Wood Variation: Its Causes and Control , 1989 .

[32]  H. E. Troxell,et al.  Wood properties of immature ponderosa pine after thinning , 1983 .

[33]  J. H. Smith.  Influences of spacing on radial growth and percentage latewood of Douglas-fir, western hemlock, and western redcedar. , 1980 .

[34]  H. Brix,et al.  Effects of thinning and nitrogen fertilization on xylem development in Douglas-fir , 1980 .

[35]  J. Brazier,et al.  The Use of a Breast-height Core for Estimating Selected Whole-tree Properties of Sitka Spruce , 1979 .

[36]  B. Bendtsen.  Properties of wood from improved and intensively managed trees. , 1978 .

[37]  W. Cǒté,et al.  Principles of Wood Science and Technology: I Solid Wood , 1977 .

[38]  Alfred J. Stamm,et al.  Principles of Wood Science and Technology , 2013, Springer Berlin Heidelberg.

[39]  T. Kozlowski.  Growth and Development of Trees , 1971 .

[40]  Philip R. Larson,et al.  Wood Formation and the Concept of Wood Quality , 1969 .

[41]  A. J. Panshin,et al.  Textbook of Wood Technology , 1964 .