Biomass equations and estimation for Gmelina arborea and Nauclea diderrichii stands in Akure forest reserve

Fuwape, J. A.; Onyekwelu, Jonathan C.; Adekunle, V. A. J.

doi:10.1016/s0961-9534(01)00036-8

Cited by 27 publications

(16 citation statements)

References 2 publications

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“…The performance of the six models for the two species was also evaluated ( (Fuwape et al 2001). Based on these performance evaluations and rank analysis, the Weibull nonlinear growth function provided the best developed model in predicting total height of A. mangium, followed by the Chapman-Richards model, whereas the Korf/Lundqvist nonlinear growth function showed the poorest performance in the final model development.…”

Section: Final Model Developmentmentioning

confidence: 99%

DBH-height modeling and validation forAcacia mangiumandEucalyptus pellitain Korintiga Hutani Plantation, Kalimantan, Indonesia

Lumbres

Lee

Yun

et al. 2015

Forest Science and Technology

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Diameter at breast height (DBH)-height models were developed and validated for Acacia mangium and Eucalyptus pellita species in the tree plantation of Pangkalan Bun, central Kalimantan, Indonesia, using the six commonly used nonlinear growth models. A total of 2992 and 4511 total height and DBH measurements were used for A. mangium and E. pellita species, respectively. These data were randomly split into two datasets. The majority of the data (80%) were used for the initial model development and the remaining data (20%) were applied for model validation. The combined data (100%) were used for the final model development. For model validation, the bias (E) for each DBH class (5 cm interval) and the overall bias were determined. The performance of the developed models were evaluated and ranked using the coefficient of determination (R 2 ), root mean square error (RMSE), bias, absolute mean difference (AMD) and Furnival index (FI). The Weibull model had the best performance followed by the Chapman-Richards model in predicting the total height of A. mangium species and for E. pellita, the Korf/Lundqvist and Chapman-Richards models were the best models based on the evaluation statistics and rank analysis.

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Section: Final Model Developmentmentioning

confidence: 99%

DBH-height modeling and validation forAcacia mangiumandEucalyptus pellitain Korintiga Hutani Plantation, Kalimantan, Indonesia

Lumbres

Lee

Yun

et al. 2015

Forest Science and Technology

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“…Angiosperms, with their less consistent architecture and complicated branching patterns, are more problematic, but they do demonstrate predictable allometric relationships. Examples of singlespecies biomass equations from the tropics include Whitesell et al (1988), Stewart et al (1992;16 species), Dudley and Fownes (1992; eight species), Fuwape et al (2001;two species), Ong et al (2004), Padrón and Navarro (2004), Swamy et al (2004), and Saint-André et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Allometric equations for four valuable tropical tree species

Cole¹,

Ewel²

2006

Forest Ecology and Management

141

101

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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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Biomass equations and estimation for Gmelina arborea and Nauclea diderrichii stands in Akure forest reserve

Cited by 27 publications

References 2 publications

DBH-height modeling and validation forAcacia mangiumandEucalyptus pellitain Korintiga Hutani Plantation, Kalimantan, Indonesia

DBH-height modeling and validation forAcacia mangiumandEucalyptus pellitain Korintiga Hutani Plantation, Kalimantan, Indonesia

Allometric equations for four valuable tropical tree species

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

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