Allometric equations for four valuable tropical tree species

Cole, Thomas G.; Ewel, John J.

doi:10.1016/j.foreco.2006.04.017

Cited by 141 publications

(122 citation statements)

References 33 publications

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“…Com base nas medidas das 11 árvores amostradas, utilizadas no processo de determinação da massa seca, ajustaram-se os dados usando-se análise de regressão, observando-se previamente a relação entre o grupo de variáveis e a fitomassa da planta, pela definição de que somente as variáveis com correlação linear de Pearson (r) superior a 95% deveriam ser utilizadas no modelo (Cole & Ewel, 2006). O ajuste da regressão foi realizado pelo método dos mínimos quadrados, associado à observação de aspectos relacionados à análise de variância e de resíduos e à amplitude de probabilidade entre os valores estimados e observados.…”

Section: Equações Para Estimativa Da Fitomassa E Armazenagem De Carbonounclassified

“…Cole & Ewel (2006) alertam para a dificuldade de se encontrar relações alométricas para árvores do gênero Jatropha, devido ao fato de que muitos dos modelos desenvolvidos ainda se baseiam no volume do dossel (Miranda et al, 2011), enquanto que o crescimento do pinhão manso se dá de forma modular em progressão geométrica, surgindo dois ramos a partir de cada inflorescência, assim sucessivamente (Dias et al, 2007). Logo, dentre os fatores limitantes, a complexa forma estrutural da planta aparece como barreira à formulação de equações que possam estimar, de modo satisfatório, sua fitomassa.…”

Section: Introductionunclassified

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Equações Alométricas para Estimativa de Fitomassa em Cultivo de Pinhão Manso

et al. 2015

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RESUMOEste trabalho descreve estimativas de fitomassa e de estoque de carbono em cultivo de pinhão no Vale do Paraíba Paulista utilizando equações alométricas desenvolvidas com base em análise de regressão, que consideraram a fitomassa como uma variável dependente de medições dendrométricas de fácil obtenção na planta. As estimativas foram validadas por meio de método destrutivo direto, ponderando o corte de árvores de diferentes alturas e estruturas. Quando comparado com outros modelos, a equação linear Y = 1,3 (h²d), em que Y é a biomassa (kg), h é a altura (m) e d é a projeção da copa (m), apresentou resultados confiáveis e erros não significativos para árvores de até 3,2 m de altura. Para o espaçamento de 4 × 3 m foi avaliado que o estoque de matéria seca variou entre 0,5 e 6 Mg ha -1 , enquanto o carbono armazenado na área pode chegar a 3 Mg C ha -1 .Palavras-chave: Jatropha curcas, bioenergia, mecanismo de desenvolvimento limpo. Allometric Equations for the Estimation of Jatropha Curcas Biomass ABSTRACTThis paper describes the estimation of biomass and carbon stock in Jatropha crops in the Vale do Paraíba region, Brazil, using allometric equations developed based on regression analysis which considered the biomass as a variable dependent on easily obtainable dendrometric measurements. The biomass estimated using allometric equations was validated by the destructive direct method based on the cutting of trees of different heights and structures. When compared with other models, the linear equation Y = 1.3 (h²d), where Y is the biomass (kg), h is the height (m), and d is the crown projection (m) showed reliable results and no significant errors to estimate trees up to 3.2 m tall. For the 4 × 3 m plant spacing, result evaluations showed that the stock of dry matter ranged from 0.5 to 6 Mg ha -1 , while the carbon stored in the area could reach 3 Mg C ha -1 .

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Section: Equações Para Estimativa Da Fitomassa E Armazenagem De Carbonounclassified

Section: Introductionunclassified

Equações Alométricas para Estimativa de Fitomassa em Cultivo de Pinhão Manso

et al. 2015

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“…It also provides a good balance of accurate predictions and low data requirements (Ter-Mikaelian and Korzukhin, 1997;Ter-Mikaelian and Parker, 2000). The parameters of the equation were estimated using least squares procedures after the transformation of the non-linear equation into a linear equation, applying logarithms to both sides of the equation (Cole and Ewel, 2006;Geudens et al, 2004;Parresol, 1999). The log-log regression takes the form:…”

Section: Regression Analysismentioning

confidence: 99%

“…In this study, the addition of H contributed to decreases in the SEE for the different biomass compartments and to decreases in the mean percent standard error by 6.2% for the aboveground biomass, 3.1% to 3.3% for the belowground biomass, and 4.8% for the total biomass. Also the incorporation of height has the advantage of increasing the equation's potential applicability to different sites (Cole and Ewel, 2006;Jackson et al, 1995).…”

Section: Regression Equationsmentioning

confidence: 99%

Allometric above-belowground biomass equations for Nothofagus pumilio (Poepp. & Endl.) natural regeneration in the Chilean Patagonia

Schmidt¹,

Poulain²,

Klein³

et al. 2009

Ann. For. Sci.

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Abstract• In the present study, allometric biomass equations were developed for Nothofagus pumilio natural regeneration relating foliage, stem and branches (aboveground), roots (belowground), and total biomass to basal diameter and total height, based on destructive measurements of 390 naturally regenerated seedlings and saplings.• Basal diameter was the most important independent variable in all equations and accounted for more than 88% of the variability of the different biomass components. The addition of height as a second independent variable slightly improved the predictions.• The best-fit biomass components equations that were based on combinations of basal diameter and height as independent variables had adjusted R 2 values between 0.80 and 0.95 and a mean percent standard error between 21.3% and 26.6%.• Based on the best-fit biomass equations and the natural regeneration development in a 14-years chronosequence in forests managed under shelterwood cuts, the total biomass varied from 0.9 Mg ha −1 (0.5 Mg ha −1 above and 0.4 Mg ha −1 belowground) for the primary forest, before the shelterwood cuts, to 19.5 Mg ha −1 (13.6 Mg ha −1 above and 5.9 Mg ha −1 belowground) 14 years after the seed cut. In the same period, carbon storage varied, from 0.5 Mg ha −1 to 9.8 Mg ha −1 . Mots-clés :équations de la biomasse / Nothofagus pumilio / régénération naturelle / stockage du carbone / chronoséquence Résumé -Équations allométriques pour la biomasse aérienne et souterraine pour la régénéra-tion naturelle de Nothofagus pumilio en Patagonie chilienne.• Dans la présente étude, des équations allométriques ont été élaborées pour prédire la biomasse du feuillage, des tiges, des branches et des racines, ainsi que de la biomasse totale, à partir du diamètre à la base et de la hauteur totale dans une régénération naturelle de Nothofagus pumilio . Des mesures destructives ont été réalisées sur 390 plants régénérés naturellement et de jeunes arbres.• Le diamètre à la base était la plus importante variable indépendante dans toutes les équations et représentait plus de 88 % de la variabilité des différentes composantes de la biomasse. L'ajout de la hauteur en tant que deuxième variable indépendante, a légèrement amélioré les prédictions.• Le meilleur ajustement des équations des composantes de la biomasse, fondées sur des combinaisons du diamètre à la base et de la hauteur comme variables indépendantes, a produit des valeurs de

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“…To address this topic, models were developed describing the cycle of organic matter and nutrients (Alpízar et al 1986;Fassbender et al 1988;Beer et al 1990;Dudley and Fownes 1992;Fuwape et al 2001;Cole and Ewel 2006;Segura et al 2006), the hydrological cycle (Imbach et al 1989;Roupsard et al 2006;Köhler et al 2009) and radiative transfer in agroforestry systems (Dauzat and Eroy 1997;MialetSerra et al 2001;Leroy et al 2005;Lamanda et al 2008;Roupsard et al 2008;Leroy et al 2009;Quesada and Somarriba 2009). These models often require information on species-specific structural features of shade trees.…”

Section: Introductionmentioning

confidence: 99%

Allometric relationships of frequently used shade tree species in cacao agroforestry systems in Sulawesi, Indonesia

2013

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Shade trees play an important role within agroforestry systems by influencing radiation and wind regimes as well as nutrient and hydrological cycling. However, there is a lack of quantitative assessments of their functions. One of the reasons is the rare information on structural characteristics of shade tree species. Therefore, the aim of this study is to provide basic information on the structure of frequently used shade tree species for the implementation of models simulating the ecosystem processes in agroforestry systems. The investigation of the shade trees was conducted at two cacao agroforestry sites on Sulawesi, Indonesia. The measurements of the main structural parameters: diameter at breast height, tree height, trunk height, crown length and crown radius were carried out for the shade tree species Aleurites moluccana, Cocos nucifera and Gliricidia sepium. For data collection, the National Forest Inventory Field Manual Template by FAO (2004) was applied. Based on this information allometric functions were derived for the correspondent shade tree species. The best significant relationships were obtained for the heightcrown length relationship of the dicotyledonous tree species' A. moluccana and G. sepium with a coefficient of determination r 2 = 0.925 and r 2 = 0.738, respectively, and the height-crown length relationship of the monocotyledonous palm C. nucifera with r 2 = 0.663. The transferability tests 'analysis of covariance' and 'homogeneity of slopes' have shown that the obtained allometric functions are also applicable to other cacao agroforestry systems of the region.

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Allometric equations for four valuable tropical tree species

Cited by 141 publications

References 33 publications

Equações Alométricas para Estimativa de Fitomassa em Cultivo de Pinhão Manso

Equações Alométricas para Estimativa de Fitomassa em Cultivo de Pinhão Manso

Allometric above-belowground biomass equations for Nothofagus pumilio (Poepp. & Endl.) natural regeneration in the Chilean Patagonia

Allometric relationships of frequently used shade tree species in cacao agroforestry systems in Sulawesi, Indonesia

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