Effects of thinning on anatomical characteristics and wood properties of 12-year-old &lt;i&gt;Eucalyptus camaldulensis&lt;/i&gt; trees planted in Thailand

Aiso-Sanada, Haruna; Ishiguri, Futoshi; Diloksumpun, Sapit; Nezu, Ikumi; Tanabe, Jun; Ohshima, Jyunichi; Yokota, Shinso

doi:10.3759/tropics.ms19-04

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…This also occurred in Acacia salicina, where the treatment had a decrease in specific gravity value by 3.8% (Hegazy et al, 2014). However, a different result was reported in a 12-years-old Eucalyptus camaldulensis plantation, where the BD value was increased by 5.7%, without the alteration of the compressive strength parallel to grain (under green conditions; Aiso-Sanada et al, 2019). In Calabrian pine (Pinus nigra Arnold subsp.…”

Section: Introductionmentioning

confidence: 87%

“…Larix kaempferi (Kim et al, 2016), Eucalyptus grandis hybrid (Filho et al, 2018), Eucalyptus camaldulensis (Aiso-Sanada et al, 2019), and Pinus koraiensis (Seo et al, 2019). In teak, previous studies reported that thinning and pruning treatments significantly increase the radial growth of the remaining stands (Budiadi et al, 2017;Kanninen et al, 2004;Víquez and Pérez, 2005).…”

Section: Introductionmentioning

confidence: 98%

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Wood Physical and Mechanical Properties of Clonal Teak (Tectona grandis) Stands Under Different Thinning and Pruning Intensity Levels Planted in Java, Indonesia

SETA¹,

Hidayati²,

Widiyatno³

et al. 2023

J. Korean Wood Sci. Technol.

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The objective of this study was to reveal the impact of thinning and pruning regimes on the physical and mechanical properties of clonal teak wood planted in Java. In this study, a 15-year-old clonal teak plantation was carried out and the obtained data were evaluated with analysis of variance (ANOVA). The results showed that different thinning intensities had a significant impact on the alteration of heartwood volume development (F = 25.63; p < 0.0001). Meanwhile, the impact of different thinning treatments in several physical properties depends on the pruning treatment levels [moisture content (F = 12.18, p < 0.0001); tangential shrinkage (F = 15.60, p < 0.0001); T/R ratio (F = 7.17, p < 0.0001); and volumetric shrinkage (F = 10.81, p < 0.0001)]. However, different thinning intensities had no significant impact on wood basic density alteration (F = 0.72, p = 0.486), while pruning intensities affect the differences between radial (F = 3.52, p = 0.030) and volumetric shrinkage (F = 3.13, p = 0.044). In mechanical properties, thinning intensity levels did not promote any significant differences [modulus of elasticity (F = 1.41, p = 0.248); modulus of rupture (F = 0.94, p = 0.392); compressive strength parallel to grain (F = 0.21, p = 0.813); and compressive strength perpendicular to the grain (F = 0.41, p = 0.669)]. Meanwhile, different pruning treatments and combination treatments were not significantly altered all mechanical properties. These results indicated that the thinning and pruning regimes can enhance the mechanical properties without having a serious alteration in the physical properties of clonal teak wood.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 98%

Wood Physical and Mechanical Properties of Clonal Teak (Tectona grandis) Stands Under Different Thinning and Pruning Intensity Levels Planted in Java, Indonesia

SETA¹,

Hidayati²,

Widiyatno³

et al. 2023

J. Korean Wood Sci. Technol.

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“…A dense mat of surface roots can extend 20 m laterally in mature trees, and taproots can extend to depths of at least 10 m to access groundwater (Bacon et al., 1993). E. camaldulensis growth and size have been linked to water availability and competition (Aiso‐Sanada et al., 2019; Horner et al., 2009). Large E. camaldulensis trees inhibit the growth rates of smaller trees within a zone up to 16 times as wide as their diameter at breast height (DBH) (Opie, 1968).…”

Section: Methodsmentioning

confidence: 99%

Restoration thinning accelerates small tree growth but may slow large tree growth in a multi‐age flood‐dependent forest

Gorrod,

White,

Bedward

et al. 2024

Journal of Applied Ecology

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Large tree decline is occurring globally with critical implications for biodiversity and carbon sequestration. Restoration thinning is a potential management action to accelerate tree growth and promote large tree development in forests, yet trials have been limited and results have been mixed. We conducted a large‐scale trial to determine whether restoration thinning could accelerate the development of large trees in river red gum forests in Australia that had experienced widespread woody thickening and a decline of large trees due to long‐term commercial timber harvesting and river regulation. Thinning was conducted on 44 9‐ha plots by removing trees <40 cm diameter from around retained trees at a range of spacings. Initial tree densities ranged from ~260 to ~1860 trees per ha and 8%–86% of trees were removed by thinning. We monitored 1980 trees prior to thinning, and annually for 5 years post‐thinning. We tested the effects of thinning intensity on diameter growth of different sized trees and explored whether long‐ and short‐term water availability affected outcomes. Thinning promoted the growth of small trees <56 cm diameter, especially in drier sites during wet years. Higher thinning intensities reduced the growth rates of large trees (no smaller than 79.5 cm diameter) in wetter sites. For medium‐ and large‐sized trees, long‐ and short‐term water availability were stronger drivers of tree growth than competition due to tree density. Synthesis and applications. Restoration thinning may accelerate tree growth in young river red gum forests where all trees are small. But restoration thinning may be ineffective or detrimental in multi‐aged forests where the goal is to promote the growth rates of trees that are already medium to large in size.

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“…Nowadays, eucalyptus plants are widely planted all over the world and many researchers have extensively studied eucalyptus cultivation widely [1][2][3][4][5][6]. Eucalyptus is cheap, easy to grow and has many uses, such as being extracted as a mosquito and insect repellent, the essential oils are used to relieve nasal congestion and the bark is finely ground used to make incense.…”

Section: Introductionmentioning

confidence: 99%

An Adjusted Waveguide Antenna with A Woodpile-Shaped EBG for Eucalyptus Wood Moisture Content Measurement

Naktong,

Puangnak,

Phanthuna

et al. 2024

Trends Sci

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A rectangular waveguide antenna was tested for eucalyptus wood moisture content (MC) measurement before being used. To improve the moisture content measurement of the rectangular waveguide antenna, a woodpile-shaped Electromagnetic Band Gap (EBG) was installed by Transverse Electric (TE) arrangement. This antenna is responsible for receiving and transmitting signals which are converted from electrical energy into radio frequency energy transmitted through the air. In this research, we take advantage of the wave propagation of antennas in the air and use them to propagate waves through wood materials. To compare signal transmission power to determine moisture content in wood and the benefit of the EBG is that it acts like a convex lens to increase the strength of the waves so that they can penetrate the wood more efficiently. The results showed that woodpile-shaped EBG could increase the efficiency of receiving and transmitting signals, reduce working hours for farmers and reduce costs by about 90 %. When this antenna was tested and actually used, it was found that the frequency band that responded best to the moisture content value was 2.20 GHz. This antenna was built with an aluminum material of size 9×4×15 cm3 and 2×6 units woodpile EBG on a 9.54×4 cm2 Polyester Mylar base plate. There was a gain of 7.81 dBi from the original structure, or by 20 %. At a radius of 4 cm, the values of moisture content ranged from –9.46 to –42.19 dBm. At a radius of 6 cm, the values were –9.41 to –42.89 dBm. At a radius of 8 cm, the values ranged from –9.39 to –43.01 dBm, respectively. All 3 values were found to be efficient. The size was not less than 84 % compared to the general standard meter. HIGHLIGHTS A rectangular waveguide antenna was tested for eucalyptus wood moisture content (MC) measurement before being used. To improve the moisture content measurement of the rectangular waveguide antenna, a woodpile-shaped Electromagnetic Band Gap (EBG) was installed by Transverse Electric (TE) arrangement. This antenna is responsible for receiving and transmitting signals which are converted from electrical energy into radio frequency energy transmitted through the air. In this research, we take advantage of the wave propagation of antennas in the air and use them to propagate waves through wood materials. To compare signal transmission power to determine moisture content in wood and the benefit of the EBG is that it acts like a convex lens to increase the strength of the waves so that they can penetrate the wood more efficiently. The results showed that woodpile-shaped EBG could increase the efficiency of receiving and transmitting signals, reduce working hours for farmers and reduce costs by about 90 %. When this antenna was tested and actually used, it was found that the frequency band that responded best to the moisture content value was 2.20 GHz. This antenna was built with an aluminum material of size 9×4×15 cm3 and 2×6 units woodpile EBG on a 9.54×4 cm2 Polyester Mylar base plate. There was a gain of 7.81 dBi from the original structure, or by 20 %. At a radius of 4 cm, the values of moisture content ranged from –9.46 to –42.19 dBm. At a radius of 6 cm, the values were –9.41 to –42.89 dBm. At a radius of 8 cm, the values ranged from –9.39 to –43.01 dBm, respectively. All 3 values were found to be efficient. The size was not less than 84 % compared to the general standard meter. GRAPHICAL ABSTRACT

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Effects of thinning on anatomical characteristics and wood properties of 12-year-old <i>Eucalyptus camaldulensis</i> trees planted in Thailand

Cited by 7 publications

References 14 publications

Wood Physical and Mechanical Properties of Clonal Teak (Tectona grandis) Stands Under Different Thinning and Pruning Intensity Levels Planted in Java, Indonesia

Wood Physical and Mechanical Properties of Clonal Teak (Tectona grandis) Stands Under Different Thinning and Pruning Intensity Levels Planted in Java, Indonesia

Restoration thinning accelerates small tree growth but may slow large tree growth in a multi‐age flood‐dependent forest

An Adjusted Waveguide Antenna with A Woodpile-Shaped EBG for Eucalyptus Wood Moisture Content Measurement

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