Height-diameter Relationship Models for Teak (Tectona grandis) Plantation in Nimbia Forest Reserve, Nigeria

Shamaki, S. B.; Akindele, S. O.; Isah, A. A.; Isah, Mohammed

doi:10.9734/ajee/2016/30635

Cited by 8 publications

(9 citation statements)

References 10 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results obtained on DBH also shows that the 14 years (2009) age series had the highest mean DBH of 0.56 m, followed by the 13 years (2010) and 12 years (2011) with 0.53 m each, while the 11 years (2012) old age series had the least (0.42 m). The mean diameter in all the age series is lower than what was obtained in the University of Ibadan teak plantation (Adesoye and Oluwadare 2008), teak stands in Osho Forest Reserve (Popoola and Adesoye 2012) and teak plantation in Nimba forest reserve (Shamaki et al 2011). The results on average basal area across age series revealed that the 14 years (2009) age series had 0.26 m 2 which is the highest, followed by 13 years (2010) and 12 years (2011) both having 0.24 m 2 , while the while 11 years (2012) old age series had the least (0.14 m 2 ).…”

Section: Tree Growth Variables In the Different Age Series In The Stu...contrasting

confidence: 63%

Assessment of carbon sequestration of Teak (Tectona grandis Linn. F.) plantation on the campus of University of Ilorin, Nigeria

Amusa,

AMINU,

Moshood

2023

REFOR

View full text Add to dashboard Cite

The study assessed the carbon sequestration of Tectona grandis Linn. F. in five age series (11-15 years old), at the University of Ilorin, north-central Nigeria. Data were collected using a stratified sampling technique and twenty square plots of 25 m × 25 m were laid. A non-destructive method was used to determine the biomass of the trees. Tree enumerations were carried out for diameters at the base, top, middle, diameter at breast height (DBH), and height. Soil samples at two different depths (0-15 cm and 15-30 cm) were collected and analyzed to obtain soil organic carbon. The results were summarized using descriptive statistics, while the relationship between tree growth variables and carbon stock was assessed using correlation and regression analysis. The results showed that tree carbon stocks were 230.05 t ha-1, 362.35 t ha-1, 277.48 t ha-1, 216.40 t ha-1, and 126.20 t ha-1 for 11 years old (2012), 12 years old (2011), 13 years old (2010), 14 years old (2009) and 15 years old (2008) age series, respectively. The soil organic carbon stocks were 1.1025 t ha-1, 0.6253 t ha-1, 1.2019 t ha-1, 1.4070 t ha-1 and 0.7615 t ha-1 for 11 years old (2012), 12 years old (2011), 13 years old (2010), 14 years old (2009) and 15 years old (2008) age series, respectively. The study also revealed that the 14-year-old (2009) age series had the highest carbon stock, and the total carbon stock estimate was 151,850.84 t. The potential cash value of the carbon stock was also estimated at $91,894.40 t C ha-1 and the total PCV was $56,606,951.50. Correlation analysis showed a strong positive correlation between most of the growth variables and carbon stock. The regression equation (Y = -596.48 + 27.16 THT + 1238.34 DBH, Adj R2 = 82.7%) showed that DBH and height of trees are suitable for evaluating the carbon stock in the study area.

show abstract

Section: Tree Growth Variables In the Different Age Series In The Stu...contrasting

confidence: 63%

Assessment of carbon sequestration of Teak (Tectona grandis Linn. F.) plantation on the campus of University of Ilorin, Nigeria

Amusa,

AMINU,

Moshood

2023

REFOR

View full text Add to dashboard Cite

show abstract

“…Figure 2 indicates that the increase in height is linearly followed by the increase in diameter. The linear relationship between tree height and diameter was also occurred on Chamaecyparis obtusa (Sumida et al 2013) and also on teak stand in Nigeria (Shamaki et al 2016).…”

Section: Discussionmentioning

confidence: 75%

The growth of three teak (Tectona grandis) clones and its effect on wood properties

et al. 2020

View full text Add to dashboard Cite

Abstract. Putro GS, Marsoem SN, Sulistyo J, Hardiwinoto S. 2020. The growth of three teak (Tectona grandis) clones and its effect on wood properties. Biodiversitas 21: 2814-2820. Various clones of superior teak (Tectona grandis L. f.) trees have recently been introduced in several land conditions. A study was conducted on three different clones of superior teak known as Jati Unggul Nusantara (JUN) growing in Paliyan, Gunungkidul, Yogyakarta, Indonesia. Two different ages of those clones were observed their growth rate and its wood properties. Strip plot design was applied to the treatment of tree age (five and eight-year-old) and clone types (D14, F35, and F21 clones). Tree growth was measured on 300 trees, meanwhile, annual growth rate and wood properties were measured on 18 trees. The result showed that at five-year-old as well as eight-year-old, the D14 clone has the best growth performance with diameter of 14.6 ± 1.80 cm and 20.5 ± 2.54 cm and height of 9.8 ± 1.72 m and 15.2 ± 2.13 m respectively. The growth rate negatively correlated with temperature and had no significant correlation to the precipitation. Different clones and tree age significantly affect the variability of fiber length, green specific gravity, and heartwood proportion. The clone of D14 produced the highest-fiber length, green specific gravity, and heartwood proportion (1.111mm; 0.50 and17.7%) at five-year-old trees and (1.156 mm; 0.54 and 49.0%) at eight-years-old.

show abstract

“…While Naslund had RMSE of 2.29 and 2.81, respectively, for the two species in their study. Also, Shamaki et al [40] reported R 2 and RMSE of 0.336 and 0.995 and 0.335 and 0.995 for Chapman-Richards and Weibull H-D models, respectively, for Tectona grandis in Nimbia Forest Reserve. There is no basis for comparing the fit indices values of the study at hand and others reported in forestry literatures.…”

Section: Resultsmentioning

confidence: 97%

Height-Diameter Models for Prediction of Teak Stand in Western Nigeria

Egonmwan

2022

AJRAF

View full text Add to dashboard Cite

The Diameter-height relationship has proven to be an important part in growth and yield models which describe stand changes. Ten existing nonlinear height-diameter models were used to fit and evaluate Tectona grandis stand in Oluwa forest reserve (Nigeria) in this study. Three hundred and ninety-seven (397) trees were measured for their stand variables of which diameter at breast height (Dbh) and height (Ht) were paramount. All functions were fitted using weighted nonlinear least square regression (NLLSR), considering hetroscadasticity of variance. Model performance were evaluated using three fit statistics such as root mean squared error (RMSE), Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC). Logistic 3-parameters H-D function as the best fit based on the model’s evaluation statistics and its predictive ability with values of RMSE, AIC and BIC as 2.8925, 1974 and 1990, respectively. Gompertz, Weibull, Chapman-Richards and Michaelis-Menten models also provided good fit results comparable to the observed height-diameter relationship. Logistic function with 3-parameters has been confirmed to provide a secure estimate of total tree height for Tectona grandis in Oluwa Forest Reserve.

show abstract

Height-diameter Relationship Models for Teak (Tectona grandis) Plantation in Nimbia Forest Reserve, Nigeria

Cited by 8 publications

References 10 publications

Assessment of carbon sequestration of Teak (Tectona grandis Linn. F.) plantation on the campus of University of Ilorin, Nigeria

Assessment of carbon sequestration of Teak (Tectona grandis Linn. F.) plantation on the campus of University of Ilorin, Nigeria

The growth of three teak (Tectona grandis) clones and its effect on wood properties

Height-Diameter Models for Prediction of Teak Stand in Western Nigeria

Contact Info

Product

Resources

About