Derivation of two-way volume equation for bamboo, <i>Phyllostachys pubescens</i>

Suga, Hideo; Inoue, Akio; Kitahara, Fumiaki

doi:10.1007/s10310-010-0223-8

Cited by 16 publications

(15 citation statements)

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“…Esse procedimento é ainda mais complexo, requerendo software específico, porque a operação matemática resultante não é óbvia. Suga et al (2011) (SILVA et al, 2009;MENDES et al, 2010;DALLAGNOL et al, 2013). Mesmo em nível internacional os trabalhos de modelagem são bastante restritos.…”

Section: Figure 1 -Hypsometric Relationship (A) and Profile (B) Of Baunclassified

Estimação do volume aparente de colmos de Bambusa oldhamii e Bambusa vulgaris

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et al. 2015

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Resumo: O Brasil possui grande potencial de cultivo de espécies autóctones e introduzidas de bambu. Contudo, são poucos os trabalhos científicos que versam sobre aspectos biométricos dessas plantas, o que pode representar uma limitação para seu manejo e utilização. Assim, objetivou-se com esse artigo apresentar opções para estimativa do volume total aparente de duas espécies do gênero Bambusa: B. oldhamii e B. vulgaris, plantadas em experimento estabelecido em dezembro de 2008 em Pinhais-PR. Vinte e quatro colmos foram cubados aos 50 meses pelo método de Smalian. Os diâmetros à altura do peito -DAP variaram de 1,8 a 4,5 cm e as alturas de 3 a 7 m. As opções testadas para estimar o volume aparente dos colmos foram: 1) Modelo convencional de volume de Schumacher-Hall; 2) Modelo de afilamento polinomial de 5 o grau; 3) Modelo de afilamento polinomial de potência fracionária; e 4) Fator de forma. As opções foram examinadas estatisticamente em relação aos valores observados da variável de interesse para cada espécie e para o conjunto de ambas. Verificou-se que as quatro opções proporcionam estimativas precisas. Não houve diferença estatística entre as quatro abordagens em relação à testemunha (valores observados) pelo teste t pareado. Os resíduos (valores observados x estimados) se mostram homocedásticos, com amplitude máxima de -30 a 30%. Concluiu-se que os quatro métodos avaliados podem ser utilizados para estimar a variável de interesse nas condições do material experimental. O modelo de Schumacher-Hall representa o melhor compromisso entre simplicidade e acurácia.Palavras-chave: Acurácia. Afilamento. Bambu. Cubagem. Modelagem. Abstract:There is great potential in Brazil for the cultivation of indigenous and introduced species of bamboo. However, there is little scientific research on the biometric aspects of these plants, and this may limit their management and use. The aim of this article therefore, is to present options for estimating the total apparent volume of two species of the genus Bambusa: B. oldhamii and B. vulgaris, planted in an experiment set up in December of 2008 in Pinhais, in the state of Paraná, Brazil (PR). Twenty-four stems were cubed at 50 months using the Smalian method. Diameter at breast height (DAP) ranged from 1.8 to 4.5 cm, and height from 3 to 7 m. The options being tested for estimating the apparent volume of the culms were: 1) SchumacherHall conventional volume model; 2) fifth-degree polynomial taper model; 3) fractional-power polynomial taper model; and 4) form factor. The options were examined statistically relative to the observed values for the target variable, for each species and for both species as a set. It was found that the four options give precise estimates. There was no statistical difference between the four approaches and the control (observed values) by paired t-test. The residuals (estimated x observed values) are shown to be homoscedastic with a maximum width of from -30 to 30%. It was concluded that the four methods under test can be used to estimate the target var...

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Section: Figure 1 -Hypsometric Relationship (A) and Profile (B) Of Baunclassified

Estimação do volume aparente de colmos de Bambusa oldhamii e Bambusa vulgaris

Sanquetta

Côrte

et al. 2015

AGRO@MBIENTE

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“…(24), for moso bamboos was evaluated by the following procedure. Since there were no available data on either r 0.1 or , we deduced a new linear relation: r 0.1 = 0.466d b + 0.231 (coefficient of determination R 2 = 0.997), from statistical analysis of other existing data for the breast-height diameter d b and r 0.1 over 200 samples [45]. It is noteworthy that d b is a common dendrometric measurement, expressing the diameter of the trunk or bole of a standing tree at the height of an adult human's breast ( 1.3 m) [49].…”

Section: Appendix B: Evaluation Of ηmentioning

confidence: 99%

“…They are partly cited from existing measurement data; the values of a and b were reported in Ref. [45], and that of ε was given in Ref. [43].…”

Section: Internode Lengthmentioning

confidence: 99%

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Self-adaptive formation of uneven node spacings in wild bamboo

2016

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Bamboo has a distinctive structure wherein a long cavity inside a cylindrical woody section is divided into many chambers by stiff diaphragms. The diaphragms are inserted at nodes and thought to serve as ring stiffeners for bamboo culms against the external load; if this is the case, the separation between adjacent nodes should be configured optimally in order to enhance the mechanical stability of the culms. Here, we reveal the hitherto unknown blueprint of the optimal node spacings used in the growth of wild bamboo. Measurement data analysis together with theoretical formulations suggest that wild bamboos effectively control their node spacings as well as other geometric parameters in accord with the lightweight and high-strength design concept.

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“…The determined merchantable ratios will be effective when converting the stand wood volume into the merchantable stand volume for P. pubescens. (Suga et al 2011 図⊖3．稈サイズにともなう梢端からの距離と稈直径との関係の変化の模式図 Schematic diagram of the change in the relationship between distance from culm tip and external culm radius with the culm size.…”

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confidence: 99%