Effect of thinning on growth and shape of Castanea sativa adult tree plantations for timber production in Chile

Benedetti-Ruiz, Susana; Loewe-Muñoz, Verónica; Río, Rodrigo Del; Delard, Claudia; Barrales, Luis; Balzarini, Mónica

doi:10.1016/j.foreco.2022.120762

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…In forest management and stand design, tree density is generally considered a more easily adjustable factor compared to canopy gap fraction. The previous research also demonstrated that thinning to reduce tree density is useful for increasing tree growth [ 66 , 67 ]. In our study, a natural exponential equation was used to fit the average cumulative APAR per tree and tree density.…”

Section: Discussionmentioning

confidence: 99%

Fine-Scale Quantification of Absorbed Photosynthetically Active Radiation (APAR) in Plantation Forests with 3D Radiative Transfer Modeling and LiDAR Data

Zhao,

Qi,

et al. 2024

Plant Phenomics

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Quantifying the relationship between light and stands or individual trees is of great significance in understanding tree competition, improving forest productivity, and comprehending ecological processes. However, accurately depicting the spatiotemporal variability of light under complex forest structural conditions poses a challenge, especially for precise forest management decisions that require a quantitative study of the relationship between fine-scale individual tree structure and light. 3D RTMs (3-dimensional radiative transfer models), which accurately characterize the interaction between solar radiation and detailed forest scenes, provide a reliable means for depicting such relationships. This study employs a 3D RTM and LiDAR (light detection and ranging) data to characterize the light environment of larch plantations at a fine spatiotemporal scale, further investigating the relationship between absorbed photosynthetically active radiation (APAR) and forest structures. The impact of specific tree structural parameters, such as crown diameter, crown area, crown length, crown ratio, crown volume, tree height, leaf area index, and a distance parameter assessing tree competition, on the daily-scale cumulative APAR per tree was investigated using a partial least squares regression (PLSR) model. Furthermore, variable importance in projection (VIP) was also calculated from the PLSR. The results indicate that among the individual tree structure parameters, crown volume is the most important one in explaining individual tree APAR (VIP = 4.19), while the competition from surrounding trees still plays a role in explaining individual tree APAR to some extent (VIP = 0.15), and crown ratio contributes the least (VIP = 0.03). Regarding the spatial distribution of trees, the average cumulative APAR per tree of larch plots does not increase with an increase in canopy gap fraction. Tree density and average cumulative APAR per tree were fitted using a natural exponential equation, with a coefficient of determination ( R 2 = 0.89), and a small mean absolute percentage error (MAPE = 0.03). This study demonstrates the potential of combining 3D RTM with LiDAR data to quantify fine-scale APAR in plantations, providing insights for optimizing forest structure, enhancing forest quality, and implementing precise forest management practices, such as selective breeding for superior tree species.

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Section: Discussionmentioning

confidence: 99%

Fine-Scale Quantification of Absorbed Photosynthetically Active Radiation (APAR) in Plantation Forests with 3D Radiative Transfer Modeling and LiDAR Data

Zhao,

Qi,

et al. 2024

Plant Phenomics

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“…Ecohydrological processes in forest ecosystems are driven by various environmental and artificial factors [14], such as forest thinning [15], which affects ecohydrological processes by reducing the leaf area index and canopy interception loss [16][17][18]. The selective removal of trees, also known as thinning, is a common forest management practice used to improve tree growth [19] and develop understory vegetation [20]. Thinning is performed at different intensities for various purposes [21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Overland Flow Infiltration through Sustainable Well-Managed Thinning: Contour-Aligned Felled Log Placement in a Chamaecyparis obtusa Plantation

Farahnak,

Tanaka,

Sato

et al. 2023

Sustainability

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Contour felling is a restoration method used to decrease overland flow (OF) and soil erosion in the world. However, the impact of thinning and the placement of felled logs on OF remains inconclusive. Low ground cover and soil permeability promote OF in Chamaecyparis obtusa (Siebold et Zucc.) Endl plantations, making thinning a method for reducing runoff. We examined the relationship between OF and ground cover in a C. obtusa plantation in Japan. Event-based runoff was monitored in three plots from 2016 to 2021, with 40% thinning conducted in 2019. In plot T1, logs were randomly scattered, and, in T2, logs followed contour lines, while control plots stayed the same. After thinning, both treatment plots showed lower OF than the control plot. The ANCOVA test shows a significant slope reduction in treatment plots compared to the control plot from pre-thinning to post-thinning (T1: 0.67 to 0.26, T2: 0.66 to 0.12, p < 0.001, Tukey HSD test). However, in plot T2, OF remained stable for two years post-thinning, affirming the enduring effectiveness of contour-aligned log placement. This study backs the notion that aligning fallen logs with contour lines boosts long-term OF infiltration, supporting sustainable forest and soil management.

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Brazil nut tree increases photosynthetic activity and stem diameter growth after thinning

de Oliveira,

da Costa,

da Rocha Nina Junior

et al. 2024

Theor. Exp. Plant Physiol.

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Effect of thinning on growth and shape of Castanea sativa adult tree plantations for timber production in Chile

Cited by 8 publications

References 16 publications

Fine-Scale Quantification of Absorbed Photosynthetically Active Radiation (APAR) in Plantation Forests with 3D Radiative Transfer Modeling and LiDAR Data

Fine-Scale Quantification of Absorbed Photosynthetically Active Radiation (APAR) in Plantation Forests with 3D Radiative Transfer Modeling and LiDAR Data

Enhancing Overland Flow Infiltration through Sustainable Well-Managed Thinning: Contour-Aligned Felled Log Placement in a Chamaecyparis obtusa Plantation

Brazil nut tree increases photosynthetic activity and stem diameter growth after thinning

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