A simple field based method for rapid wood density estimation for selected tree species in Western Kenya

Olale, Kennedy; Yenesew, Abiy; Jamnadass, Ramni; Sila, Andrew

doi:10.1016/j.sciaf.2019.e00149

Cited by 8 publications

(8 citation statements)

References 17 publications

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“…The mean wood density of the sampled tree species were varying between 0.53 and 0.74 g cm -3 (Table 4). This result was similar with finding of (Olale et al, 2019) he reported mean wood density (0.42 to 0.73 g cm -3 ) for selected tree species in Western Kenya. However, our findings are far from the finding of (Tesfaye et al, 2019) studied at Chilimo forest for the five dominant native tree species(0.44 to 0.67g cm -3 .This difference might be due to diameter range and species nature (Gartner and Meinzer, 2005).…”

Section: Wood Densitysupporting

confidence: 92%

Species specific allometric equations, biomass expansion factor and wood density of native tree species in dry afromontane forest of Ethiopia

Egeta

Negash

Alebachew

et al. 2022

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Forest is the second largest store house of carbon released from different sources. However, limited allometric equations are available to determine its contribution for carbon cycle. The objective of study was to develop species specific allometric equations, establish database for Biomass Expansion Factor (BEF) and Wood Density (WD) to five tree species, namely Apodytes dimidiata, Cassiopourea malosana, Celtis africana, Ilex mitis and Myrica salicifolia grown in dry afromontane forest of Ethiopia. The sampled tree diameter at breast height (dbh) and their total height (ht) ranged from 7 to 48 cm and 6.7 to 23.4 m respectively. A total of 62 sample trees harvested from different diameter classes of each species and divided in to different biomass compartments (stem, big branches > 7cm), small branches (2-7cm) and twigs and foliage (< 2cm). To determined WD, total of 186(stem position) and108 sample disks (big branches till 7cm dbh were sampled. Oven dried at temperature of 105oc and 70oc for 72 and 24hrs for wood and foliage respectively. A set of log transformed models relating total above ground biomass to dbh, ht, WD and average crown diameter as independent variables were fitted following R-software version 4.0.1. The best biomass models were found to be having lower AIC, residual standard error and higher adj.coefficient of determination. The BEF and WD of aforementioned tree species were ranged from1.19 to 1.40 and 0.53 to 0.74 gcm− 3 respectively. Species specific allometric equations were better than generalized allometric equation for estimation of above ground biomass of Chilimo dry afromontane forest.

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Section: Wood Densitysupporting

confidence: 92%

Species specific allometric equations, biomass expansion factor and wood density of native tree species in dry afromontane forest of Ethiopia

Egeta

Negash

Alebachew

et al. 2022

Preprint

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“…In parallel, new research on improving the drilling resistance measurements as a semi-destructive method of assessing the condition of the existing timber structures are still being carried out [11][12][13]. Likewise, a method of estimation of wood density and/or moisture content by drilling chips extraction technique is constantly being improved [14][15][16][17]. Similarly, the advanced scientific studies on the development of drilling-based tests (which are increasingly and commonly considered the most convenient-the quickest and most material-saving-methods of machinability rating of any wood-based materials) has been carried out recently [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The Review of New Scientific Developments in Drilling in Wood-Based Panels with Particular Emphasis on the Latest Research Trends in Drill Condition Monitoring

Górski

2022

Forests

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Drilling is still one of the basic cutting processes that are of particular interest to wood science and technology professionals. As a result, considerable (and very diverse thematically) research has been recently carried out on drilling. The article focuses on the new and quite spectacular approach to drill condition monitoring in wood-based panels machining. One of the most innovative elements in the analyzed research trend is the adoption of the new general methodological assumptions that allow one to define the drill condition monitoring problem as a standard three-class classification. The general effectiveness of the tested monitoring systems (accuracy of classification ACC [%]), ranged between 67% and 82%. The critical classification error (CCE [%]) ranged between 0% and 1.6%. These results seem very promising, yet are still not good enough to develop a commercial monitoring system. A more useful form of obtaining diagnostic data and more effective classification strategies (algorithms) are likely to be required.

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“…Uma vez que esses influenciam em diversas propriedades da madeira, é possível avaliá-las pelos espectros gerados. 16,55 Isso é ratificado pela revisão de Tsuchikawa 27 , que reúne aplicações de NIRS na determinação de propriedades químicas, físicas e mecânicas da madeira, e outras pesquisas 17,20,52,53,54,55,56,57,58,59,60,61,62,63,64,65 .…”

Section: A Análise Da Madeira Por Nirsunclassified

“…75,76,78 As bandas observadas no NIR correspondem principalmente às vibrações das ligações C-H, N-H e O-H. 15,16,44,49,70,74,75,76,78,80 de pouco treinamento para a operação do instrumento e obtém resultados com alto grau de exatidão e precisão. 15,16,17,19,46,49,50,54,55,59,75,76,80 Contudo, a apresentação de bandas espectrais largas e frequentemente sobrepostas dificultam a atribuição do sinal para certas ligações e impedem a correlação com a concentração do analito, contendo baixa seletividade e sensibilidade, sendo necessária a utilização de métodos quimiométricos em associação com NIRS. 15,17,49,55,70,75,76,77,80 Mediante a essa associação é possível retirar as informações químicas e físicas relevantes estabelecidas nos espectros de NIR.…”

Section: Tipo De Transiçãounclassified

“…Para isso é preciso a construção de modelos de calibração multivariada a partir de uma grande quantidade de amostras de referência e representativas do sistema em estudo com ampla aplicação e alta durabilidade. Esses aspectos do modelo desenvolvido são os fatores limitantes da aplicação de NIRS para análises qualitativas e quantitativas15,49,80 e são dependentes do número de amostras utilizadas no conjunto de calibração, do instrumento adotado e das condições das medições 59,74. Maiores detalhes sobre os métodos quimiométricos e estratégias que aperfeiçoam os modelos de calibração multivariada serão apresentados nas próximas seções.…”

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Discriminação de madeiras similares por NIRS e PLS-DA considerando variações de temperatura e umidade

Lopes¹

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A Deus por me garantir força, saúde e sabedoria ao longo de toda a minha caminhada. Aos meus pais Roberto e Elaine por sempre estarem ao meu lado, acreditarem em mim e nunca medirem esforços para me ajudar. Ao meu irmão João Luiz (Jota), meu melhor amigo, minha companhia de todas as horas e " fisioterapeuta" particular. A minha grande família, principalmente meus avôs (Luiz "in memoriam" e João (Joca) "in memoriam"), minhas avós (Francisca e Alice) e minha madrinha (Eliana). Ao meu orientador Prof. Dr. Jez Willian Batista Braga pela orientação, atenção, paciência, aprendizagem, confiança, amizade, motivação, entre outras inumeráveis virtudes compartilhadas durante todos esses anos de Mestrado e iniciação científica, o meu sincero agradecimento e admiração. A minha coorientadora Dra. Tereza Cristina Monteiro Pastore por me receber com tanto carinho, ir à bancada, pelos cuidados, pela confiança, orientação, atenção, aprendizagem, motivação e amizade. Ao Serviço Florestal Brasileiro (SFB) pela disponibilização das dependências do Laboratório de Produtos Florestais (LPF) para a realização desse trabalho, dando acesso ao espectrômetro FT-IR/NIR para a realização das medidas, às cubas acrílicas para o estudo das condições envolvendo variações de temperatura e umidade relativa do ar e às amostras de madeira do acervo da Área de Anatomia e Morfologia.

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A simple field based method for rapid wood density estimation for selected tree species in Western Kenya

Cited by 8 publications

References 17 publications

Species specific allometric equations, biomass expansion factor and wood density of native tree species in dry afromontane forest of Ethiopia

Species specific allometric equations, biomass expansion factor and wood density of native tree species in dry afromontane forest of Ethiopia

The Review of New Scientific Developments in Drilling in Wood-Based Panels with Particular Emphasis on the Latest Research Trends in Drill Condition Monitoring

Discriminação de madeiras similares por NIRS e PLS-DA considerando variações de temperatura e umidade

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