A rapid method for estimating the median diameter of the stem profile of Norway spruce (Picea abies Karst) trees

Vasilescu, Maria Magdalena; Tereşneu, C. C.; Dinulică, Florin

doi:10.3832/ifor1945-009

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Intense competition among neighbouring trees forces them to prioritise height over diameter growth to compete for sunlight, resulting in larger height-to-diameter ratios in more competitive stands. This has been confirmed for different species of Chinese fir, Engelmann spruce [126,127], Betula pendula Roth and B. pubescens Ehrh [128], Norway spruce [129], and Sitka spruce [21]. Aside from tree diameter and height, the crown characteristics are important, as they affect the projected area that the wind 'sees' [130] and the tree dynamic response, and therefore control the wind loading on the tree [86,113].…”

Section: Architecture: Morphology Tree Height Diameter and Crown Char...mentioning

confidence: 70%

Unearthing Current Knowledge Gaps in Our Understanding of Tree Stability: Review and Bibliometric Analysis

Ekeoma,

Sterling,

Metje

et al. 2024

Forests

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Forest preservation and management are paramount for sustainable mitigation of climate change, timber production, and the economy. However, the potential of trees and forests to provide these benefits to the ecosystem is hampered by natural phenomena such as windthrow and anthropogenic activities. The aim of the current research was to undertake a critical thematic review (from 1983 to 2023) informed by a bibliometric analysis of existing literature on tree stability. The results revealed an increase in tree stability research between 2019 and 2022, with the USA, France, and Italy leading in research output, while Scotland and England notably demonstrated high research influence despite fewer publications. A keyword analysis showed that tree stability can be divided into four themes: tree species, architecture, anchorage, and environmental factors. Prominent studies on tree stability have focused on root anchorage. However, more recently, there has been a growing emphasis on urban forestry and disease-induced tree damage, underscoring a shift towards climate change and diversity research. It was concluded that considerable knowledge gaps still exist; that greater geographic diversification of research is needed and should include tropical and sub-tropical regions; that research relating to a wider range of soil types (and textures) should be conducted; and that a greater emphasis on large-scale physical modelling is required. Data and knowledge produced from these areas will improve our collective understanding of tree stability and therefore help decision makers and practitioners manage forestry resources in a more sustainable way into the future.

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Section: Architecture: Morphology Tree Height Diameter and Crown Char...mentioning

confidence: 70%

Unearthing Current Knowledge Gaps in Our Understanding of Tree Stability: Review and Bibliometric Analysis

Ekeoma,

Sterling,

Metje

et al. 2024

Forests

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“…The volume of the standing timber was calculated using Eq. 3 (Leahu 1994;Giurgiu et al 2004;Vasilescu et al 2017),…”

Section: Computing the Lumber Recoverymentioning

confidence: 99%

Musical instrument lumber recovery from Romanian resonance spruces

Albu¹,

Dinulică

Bartha

et al. 2019

BioRes

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Increasing demand for resonance spruce has led to gradual depletion of resources in traditional areas. Consequently, to meet the need for raw material to manufacture musical instruments, sorting has become the key operation of exploitation. This study was completed on the largest Romanian resonance wood resource, to maximize outputs of flitches for violin, cello, and double bass instruments by optimizing traditional requirements regarding quality of raw material with its current level. Ten resonance spruces were felled and gradually turned into semi-manufactured musical instruments. The material was analysed for defects in all stages of conversion. The frequency of zero defective samples was 60%. Evolution of defects along the trees indicated the tree section from 1 m to 12 m above the ground for musical instruments manufacturing. Output in terms of flitches ranged from one tree to another: between 19 and 32% if calculated from logs volume, and between 13 and 30% if calculated from volume of the standing trees. The results advocated for relaxing traditional requirements on resonance logs, at least regarding buttress and knottiness. Thus, recommendations are made, from the perspective of increasing efficiency, on the admissibility of defects and size diversification of musical instruments.

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“…The volume estimated by the proxy function is changed by the ratio of the actual crosssectional area at a randomly chosen point on the log to the anticipated cross-sectional area at that point. VASILESCU et al (2017), on the other hand, created the Centroid technique (Centroid Sampling), a version of Importance Sampling, for calculating log, merchantable volume, and total tree volumes. Certain studies found that Centroid Sampling yielded more reliable results for several tree species than other common formulae (e.g., Huber, Smalian, and Newton-Riecke).…”

Section: Introductionmentioning

confidence: 99%

Evaluations of Different Models for Predicting Merchantable Volume of Pinus Brutia Ten. In Duhok Governorate

Abdulqader

Obeyed

2023

SJUOZ

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This study was initiated with the main objective of evaluating the prediction power of previously 24 published models in the literature, developed for estimating the merchantable volume of natural stands of Pinus brutia Ten. The estimation was based on measuring the breast diameter (D), tree height (h), and absolute form quotient (F) of 120 pine trees (Pinus brutia Ten.) from 2 natural stands situated to the east of Duhok governorate. Six indicators of Fit test statistics, namely Adjusted coefficient of determination (R2- adj.) standard error of estimate (SEE), mean absolute error (MAE), Durbin-Watson statistic (D-W), p-value, and mean biased error (Bias) were used to test the performance of the applied models. The result from the centroid model was considered a reference method for the evaluation during this study. The results indicated that the square root –y logarithmic-x offered the highest performance followed by the double square root model. The square root –y logarithmic-x (equation 11) attributed more than 90% of the variation in merchantable volume to variations in D, h, and F. Furthermore, the mean absolute error of prediction of this model was 0.0434. According to this study, the mean stem form of Pinus brutia trees is (0.64), which signifies quadratic paraboloid.

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A rapid method for estimating the median diameter of the stem profile of Norway spruce (Picea abies Karst) trees

Cited by 6 publications

References 14 publications

Unearthing Current Knowledge Gaps in Our Understanding of Tree Stability: Review and Bibliometric Analysis

Unearthing Current Knowledge Gaps in Our Understanding of Tree Stability: Review and Bibliometric Analysis

Musical instrument lumber recovery from Romanian resonance spruces

Evaluations of Different Models for Predicting Merchantable Volume of Pinus Brutia Ten. In Duhok Governorate

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