Needs and opportunities for using a process-based productivity model as a practical tool in Eucalyptus plantations

Almeida, Auro C.; Landsberg, J. J.; Sands, Peter; Ambrogi, Marcelo S; Fonseca, Sebastião; Barddal, Simone M; Bertolucci, Fernando L.

doi:10.1016/j.foreco.2004.01.044

Cited by 75 publications

(60 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, some of the parameters of the model, were also estimated by calibration (A) (SANDS & LANDSBERG, 2002;LANDSBERG et al, 2003;ALMEIDA et al, 2004b;BUGG et al, 2006). This procedure consists in varying, inside a range of values available in literature, the values of these parameters.…”

Section: Obtaining the Value Of The Model's Parametermentioning

confidence: 99%

“…According to Almeida et al (2004b), a number of parameters of the 3-PG model can be altered in the calibration process, although the ideal procedure is to use the standard values of the original model, literature data or the best possible empiric value, for as many parameters possible. The main parameters of the model and the way they were obtained in this work are presented on Table 3.…”

Section: Obtaining the Value Of The Model's Parametermentioning

confidence: 99%

“…The 3-PG enables the prediction of the impact of key environmental factors on productivity (solar radiation, temperature, water and nutrients) and management practices, on the productive potential of the forest species and, consequently, on the sustainability of planted forests (ALMEIDA et al, 2004a). It aid in the quantification of risks associated to production, improving the quality of the decision making process.…”

Section: Introductionmentioning

confidence: 99%

“…In Brazil, this performance has been evaluated from data obtained in plantations of forest companies located in the States of Bahia (STAPE, 2002;STAPE et al, 2004), Espírito Santo (ALMEIDA et al, 2004a,b;ALMEIDA et al, 2010) and the central-east region of Minas Gerais state (SILVA, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Parametrização do modelo 3-PG para eucalipto na região do cerrado de Minas Gerais

Borges

Neves²,

Lourenço³

et al. 2012

Ciênc. Florest.

View full text Add to dashboard Cite

The 3-PG model is an effective tool for determining the productive productivity of eucalypt plantations. However, the model parameterizations available today produce underestimated results when they are applied to Cerrado region of Minas Gerais state. Thus, in this paper we aimed to parameterize the 3-PG model for fast-growing eucalypt clonal plantations in the Cerrado region of Minas Gerais state, Brazil. To perform the parameterization, there were collected data from stands of Eucalyptus grandis x Eucalyptus urophylla clonal hybrid, throughout an age range, from very young stands (about 3 months old) until adult stands (about 7 years old), in two regions (Curvelo and Itacambira -MG). The growth estimates obtained by 3-PG were compared with data from forest inventory in both regions, until 84 months old. The application of 3-PG model using the set of parameter and variable values determined in the study allowed to describe, accurately, the growth patterns of forests stands in the Cerrado region of Minas Gerais state. Thus, it follows that the parameterization upgraded the performance of the model that resulted in accurate estimates of growth. Key words: process-based modeling; simulation; eucalypt. RESUMOO modelo 3-PG é uma ferramenta eficaz para determinação do potencial produtivo de florestas de eucalipto. No entanto, as parametrizações deste modelo, hoje disponíveis, produzem resultados subestimados quando aplicadas à região do Cerrado de Minas Gerais. Dessa forma, o objetivo deste trabalho foi parametrizar o modelo 3-PG para plantios de eucalipto localizados na região do Cerrado de Minas Gerais. Para isso, foram utilizados dados de povoamentos de híbridos clonais de Eucalyptus grandis x Eucalyptus urophylla, com idades entre 3 e 84 meses, localizados nas regiões de Curvelo e Itacambira -MG. As estimativas de crescimento obtidas pelo modelo 3-PG foram comparadas com dados de crescimento de povoamentos florestais medidos nas duas regiões, até a idade de 84 meses. O conjunto de valores de parâmetros e variáveis obtidos neste trabalho permitiu simular com acurácia, em termos das variáveis produzidas pelo modelo, os padrões de crescimento de povoamentos florestais presentes na região do Cerrado mineiro. Dessa forma, conclui-se que a parametrização promoveu melhorias no desempenho do modelo que resultaram em estimativas acuradas de crescimento. Palavras-chave: modelagem processual de crescimento; simulação; eucalipto.

show abstract

Section: Obtaining the Value Of The Model's Parametermentioning

confidence: 99%

Section: Obtaining the Value Of The Model's Parametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Parametrização do modelo 3-PG para eucalipto na região do cerrado de Minas Gerais

Borges

Neves²,

Lourenço³

et al. 2012

Ciênc. Florest.

View full text Add to dashboard Cite

show abstract

“…Это затрудняет экстраполяцию полученных результатов на другие почвенно-климатические условия даже для одного вида. В этой связи возрастает роль математических моделей как инструмента прогноза эффективности лесных плантаций, особенно, в условиях появления новых биотехнологических форм деревьев с измененными характеристиками роста, для которых еще не накоплен достаточный экспериментальный материал [13][14][15][16].…”

unclassified

Modeling the Productivity of Forest Plantations with the Different Spacing the Trees

Priputina¹

2016

Math.Biol.Bioinf.

View full text Add to dashboard Cite

The main objective of this study was to assess the biomass productivity of short-rotation forest plantations depending on different spacing between trees. Our simulations were focused on the birch plantation with the initial density of 2500 trees·ha-1, which could be reached by using two planting schemes: with the distances between trees in a row and between rows, respectively, 2 and 2 m or 1 and 4 m. We used the model EFIMOD-fbp-REG, and the soil-climatic data relevant to the Eutric Podzoluvisols disposed in the Republic of Mariy El in the Eastern part of European Russia. The results showed greater biomass of trees in the planting scheme of 1 × 4 m. With the scheme of 2 × 2 m, increments of diameters and heights of most trees decreased at the age of 15–20 years, and then the total number of trees strongly reduced. Intensive death of trees with the scheme of 2 × 2 m was due to the procedure simulating the self-thinning of trees, which was used in the model. It is based on the use of the threshold ratio of an annual biomass increment of the tree to the total tree biomass, IP/BT. With the planting scheme of 2 × 2 m, the almost simultaneous closing of crowns and root areas of neighboring trees in rows and between rows was the cause a competition for light and for available soil nitrogen, and resulted in a sharp reduction of biomass increments. As a consequence, the value of IP/BT was below the threshold. With the planting scheme of 1 x 4 m, step-by-step (or gradual) closing of crowns and root areas of trees (first in the rows and then between rows) reduced the competition effects, that ensured a higher growth rate of the tree stand in the next years.

show abstract

Improving the ability of 3‐PG to model the water balance of forest plantations in contrasting environments

Almeida

Sands²

2015

Ecohydrology

View full text Add to dashboard Cite

Because water availability is a primary factor that influences growth of forest plantations, quantifying plantation water use is an important part of the decision-making process when selecting new plantation areas. The 3-PG model (Landsberg and Waring, Forest Ecology and Management 95: 209-228, 1997) has been used successfully to model forest growth for several species. However, some studies have demonstrated limitations in 3-PG's ability to accurately model the soil and plant water balance. This paper addresses these limitations through the development and validation of a modified water balance submodel that models canopy interception, soil evaporation, tree transpiration, drainage, run-off, soil water content and available soil water in the root and non-root zone. The new submodel was tested and validated using detailed, long-term observed growth and water balance data from contrasting environments in Australia and Brazil and showed improved estimation of available soil water, even when only monthly weather data were available. However, the new submodel requires more soil texture-dependent parameters than the original submodel. Sensitivity analysis of these new parameters shows that values of soil field capacity, wilting point and soil depth may have strong impacts on the prediction of run-off, soil water content and available soil water.

show abstract

Needs and opportunities for using a process-based productivity model as a practical tool in Eucalyptus plantations

Cited by 75 publications

References 24 publications

Parametrização do modelo 3-PG para eucalipto na região do cerrado de Minas Gerais

Parametrização do modelo 3-PG para eucalipto na região do cerrado de Minas Gerais

Modeling the Productivity of Forest Plantations with the Different Spacing the Trees

Improving the ability of 3‐PG to model the water balance of forest plantations in contrasting environments

Contact Info

Product

Resources

About