Difference in shade tolerance affects foliage–sapwood response to thinning by two eucalypts

Yao, Rui Ling; Glencross, Kevin S; Nichols, J. Doland

doi:10.2989/20702620.2014.917354

Cited by 6 publications

(2 citation statements)

References 57 publications

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“…Of the two clones that may have inherited both E. globulus and E. grandis alleles, the E. globulus inheritance seems to have dominated regarding this parameter in the case of HE, while in the case of HG, the E. grandis inheritance seems to have dominated. The SLA values obtained in this study are within the range reported by other authors for eucalypts e.g., 16 [72]. During the seasonal development of the studied clones, SLA decreased progressively over time from autumn-winter leaves to spring-summer leaves.…”

Section: Cuticular Transpiration and Slasupporting

confidence: 89%

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Carignato

Vázquez‐Piqué

Tapias

et al. 2019

Forests

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Background and Objectives. Water stress is a major constraining factor of Eucalyptus plantations’ growth. Within a genetic improvement program, the selection of genotypes that improve drought resistance would help to improve productivity and to expand plantations. Leaf characteristics, among others, are important factors to consider when evaluating drought resistance evaluation, as well as the clone’s ability to modify leaf properties (e.g., stomatal density (d) and size, relative water content at the time of stomatal closure (RWCc), cuticular transpiration (Ec), specific leaf area (SLA)) according to growing conditions. Therefore, this study aimed at analyzing these properties in nursery plants of nine high-productivity Eucalyptus clones. Material and Methods: Five Eucalyptus globulus Labill. clones and four hybrids clones (Eucalyptus urophylla S.T. Blake × Eucalyptus grandis W. Hill ex Maiden, 12€; Eucalyptus urograndis × E. globulus, HE; Eucalyptus dunnii Maiden–E. grandis × E. globulus, HG; Eucalyptus saligna Sm. × Eucalyptus maidenii F. Muell., HI) were studied. Several parameters relating to the aforementioned leaf traits were evaluated for 2.5 years. Results: Significant differences in stomatal d and size, RWCc, Ec, and SLA among clones (p < 0.001) and according to the dates (p < 0.001) were obtained. Each clone varied seasonally the characteristics of its new developing leaves to acclimatize to the growth conditions. The pore opening surface potential (i.e., the stomatal d × size) did not affect transpiration rates with full open stomata, so the water transpired under these conditions might depend on other leaf factors. The clones HE, HG, and 12€ were the ones that differed the most from the drought resistant E. globulus control clone (C14). Those three clones showed lower leaf epidermis impermeability (HE, HG, 12€), higher SLA (12€, HG), and lower stomatal control under moderate water stress (HE, HG) not being, therefore, good candidates to be selected for drought resistance, at least for these measured traits. Conclusions: These parameters can be incorporated into genetic selection and breeding programs, especially Ec, SLA, RWCc, and stomatal control under moderate water stress.

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Section: Cuticular Transpiration and Slasupporting

confidence: 89%

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Carignato

Vázquez‐Piqué

Tapias

et al. 2019

Forests

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“…As mentioned above, the leaf area index is directly related to the spacing between individuals. This depends on the shading tolerance shown by the different eucalyptus species [36]. However, contrary results were obtained by Wilkins [37] with very similar values of sapwood proportion in treatments without and with thinning at the age of 2.75 years (1089 and 479 trees•ha −1 , respectively) in E. grandis.…”

Section: Introductionmentioning

confidence: 62%

Impact of Thinning on the Yield and Quality of Eucalyptus grandis Wood at Harvest Time in Uruguay

Resquin,

Baez,

de Freitas

et al. 2024

Forests

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Understanding how thinning strategies impact wood quality and quantity for different purposes is of interest, given that plantation management is often based on parameters that require validation under varying growth conditions. Planted forests for solid purposes in the northern region of Urugay, western Argentina and South of Brazil are usually managed in initial stockings ranging from 800 to 1200 trees·ha−1 depending on the use of clones or seeds. Subsequent thinnings are applied (at plantation ages varying from 3 to 11 years) up to final stockings of around 200 trees·ha−1. This study evaluated contrasting thinning regimes applied early in the crop cycle, with an initial tree density of 840 trees·ha−1. Two thinning treatments were applied at 1.5 and 7.3 years, reducing tree densities to 700–400 and 400–100 trees·ha−1, respectively. Growth analyses were conducted from 1.5 to 20.8 years, considering total height, diameter at breast height, individual volume, total and commercial volume per hectare, mean annual increase, and current annual increase. At the final harvest, contrasting tree densities of 100, 250, and 400 trees·ha−1 were sampled to assess wood density and mechanical properties (bending and compression on small-scale clear samples). Individual growth and wood properties were related to a Stand Density Index to understand the effect of competition on these values. The results identified thinning regimes that resulted in the most significant individual and per-hectare growth (both in thinning and clear felling) and the optimal harvest time under specific growth conditions. We assessed the proportions of commercial logs for sawmill and pulp uses, providing valuable inputs for subsequent economic analyses of thinning regimes aiming for the most convenient combination of wood products. Wood’s physical and mechanical properties were relatively little affected by contrasting levels of competition between trees; therefore, the choice of silvicultural system will depend on production and economic criteria.

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Growth and physiological responses to intensity and timing of thinning in short rotation tropical Acacia hybrid plantations in South Vietnam

Huong

Mendham

2016

Forest Ecology and Management

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Difference in shade tolerance affects foliage–sapwood response to thinning by two eucalypts

Cited by 6 publications

References 57 publications

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Variability and Plasticity in Cuticular Transpiration and Leaf Permeability Allow Differentiation of Eucalyptus Clones at an Early Age

Impact of Thinning on the Yield and Quality of Eucalyptus grandis Wood at Harvest Time in Uruguay

Growth and physiological responses to intensity and timing of thinning in short rotation tropical Acacia hybrid plantations in South Vietnam

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