A model for predicting the growth of Eucalyptus globulus seedling stands in Bolivia

Guzmán, Gustavo; Morales, Manuel B.; Pukkala, Timo; de-Miguel, Sergio

doi:10.5424/fs/2012212-02398

Cited by 9 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fixed-effects models are also inferior to mixed-effect models when the aim is to make inferences about the population. However, several studies have shown that a fixed-effects model results in a smaller root mean square error (RMSE) than using only the fixed part of a mixed-effects model (Temesgen, Monleon, & Hann, 2008;Garber, Temesgen, Monleon, & Hann, 2009;Pukkala et al, 2009;Shater, de-Miguel, Kraid, Pukkala, & Palahí, 2011;Groom, Hann, & Temesgen, 2012;Guzmán, Morales, Pukkala, & de-Miguel, 2012a, Guzmán, Pukkala, Palahí, & de-Miguel, 2012bHeiðarsson & Pukkala, 2012). De-Miguel, Guzmán, & Pukkala (2013) found that, in the absence of calibration data, mixed-effects models should be used with caution.…”

mentioning

confidence: 98%

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Pukkala

Lähde²,

Laiho³

2013

Journal of Sustainable Forestry

107

View full text Add to dashboard Cite

Many boreal tree stands are neither clearly even-aged nor clearly uneven-aged. The stands may undergo a series of stages, during which an even-aged stand is transformed into two-storied mixed stand, and finally to multistoried or uneven-aged stand structure. The species composition often changes during the succession of stand stages. This study developed models for stand dynamics that can be used in different stand structures and species compositions. The model set consists of species-specific individual-tree diameter increment and survival models, and models for ingrowth. Separate models were developed for Scots pine, Norway spruce, and hardwood species. The models were used in a growth simulator, to give illustrative examples on species influences and stand dynamics. Methods to simulate residual variation around diameter increment and ingrowth models are also presented. The results suggest that mixed stands are more productive than one-species stands. Spruce in particular benefits from an admixture of other species. Mixed species improve diameter increment, decrease mortality, and increase ingrowth. Pine is a more beneficial admixture than birch. Simulations showed that uneven-aged management of spruce forests is sustainable and productive, and even-aged conifer stands growing on medium sites can be converted into uneven-aged mixed stands by a series of strong high thinnings.

show abstract

mentioning

confidence: 98%

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Pukkala

Lähde²,

Laiho³

2013

Journal of Sustainable Forestry

107

View full text Add to dashboard Cite

show abstract

“…However, the variation in our study was from 8.4 m 3 m 3 ha -1 year -1 to 50.1 m 3 ha -1 year -1 . A model based study done on E.globulus in Bolivia by Guzmán et al (2012) also found that the mean annual growth with optimal rotation length is about 13 m 3 ha -1 year -1 on medium quality sites and 18 m 3 ha -1 year -1 one productive sites. However, our results was higher than the Bolivian study although the study did not based on site productivity classification.…”

Section: Discussionmentioning

confidence: 91%

Assessment of Eucalyptus Globulus Coppice Yield in the Highland Areas of North Shewa, Ethiopia

Woldeamanual¹,

Reta²,

Nigussie³

et al. 2020

Malays. j. med. biol. res.

View full text Add to dashboard Cite

One of the old traditional methods of silvicultural management is coppicing. Many woody species produce new shoots successfully after coppicing. Regeneration of forest through coppice can be used for short rotation of tree to produce wood biomass for construction and fuel purposes. There are different levels of coppice practiced in Eucalyptus globulus plantation in the highland areas of North Shewa. However, there was no evidence or study which coppice levels can give high yield. Therefore, the objective of this study was to compare yield of E. globulus at different coppice level in the highland areas of North Shewa, Ethiopia. Fifty sampled plots were purposively selected for this study. Volume, mean annual increment, stump height and diameter, stem number and harvesting age were determined from sampled plots. The results revealed that there was no yield difference (p> 0.05) between zero, first, second and third coppice levels. However, stump diameter and number of shoots per stump, stump height were significantly different among 1, 2, 3 coppice levels (p<0.05). Number of shoots were positively correlated with stump diameter and height (r = 0.77, r = 0.72) respectively. Farmers mostly coppice E.globulus from November to December and from April to June. Although statistically there was no yield difference between coppice levels, as farmers described the first coppice has higher yield than other coppice levels. The numbers of shoots per stump were higher in the second and third coppice and this could affect stem quality especially at early stage. Altogether the mean number of stems per hectare was 10812 which is higher than previous studies. Therefore, early silvicultural activities like thinning, early coppice management and pruning has to be done to increase wood stem quality and to promote growth as well.

show abstract

“…In addition, the synchronization of seedlings in nurseries is highly sensitive to temperature. Therefore, to support agricultural management, a technique that enables reliable prediction of seedling growth is necessary [24].…”

Section: Introductionmentioning

confidence: 99%

Using Sigmoid Growth Curves to Establish Growth Models of Tomato and Eggplant Stems Suitable for Grafting in Subtropical Countries

Hsieh

Fang

Wu³

et al. 2021

Horticulturae

View full text Add to dashboard Cite

In subtropical regions, tomato (Solanum lycopersicum) is mainly produced in autumn and winter. To enhance the off-season production of tomato, summer cultivation has become a prime objective. Grafting tomato scions onto eggplant (Solanum melongena) rootstocks is a key method to overcome the difficulties of tomato cultivation in summer. In this study, we collected seedling growth data over six growing seasons in Taiwan and established growth models by employing three commonly used sigmoid growth curves, namely the Gompertz, Richards, and Logistic curves. Cumulative temperature was introduced as an independent variable and its relationship with plant stem diameter determined. The R2 values of the growth models were 0.74–0.85 and 0.72–0.80 in calibration and validation, respectively. Performance did not differ markedly among models in the same growing season, but notable differences were observed among models for different growing seasons. In addition, the estimates of several model parameters differed significantly among the seasons; hence, separate models should be established for different seasons. The results of this study can be used in prediction of tomato and eggplant seedling growth and arrangement of the grafting schedule to improve the efficiency of seedling production in subtropical countries.

show abstract

A model for predicting the growth of Eucalyptus globulus seedling stands in Bolivia

Cited by 9 publications

References 11 publications

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Assessment of Eucalyptus Globulus Coppice Yield in the Highland Areas of North Shewa, Ethiopia

Using Sigmoid Growth Curves to Establish Growth Models of Tomato and Eggplant Stems Suitable for Grafting in Subtropical Countries

Contact Info

Product

Resources

About