Int. J. Fores. Env. | Volume 05, Issue 01, 178-194 | https://doi.org/10.18801/ijfee.050121.21
Article type: Research article | Received: 07.04.21; Revised: 16.07.21; First published online: 31 July, 2021.
Article type: Research article | Received: 07.04.21; Revised: 16.07.21; First published online: 31 July, 2021.
Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria
Saka, M. G.
Department of Forestry and Wildlife Management, Modibbo Adama University of Technology, Yola, Nigeria.
✉ Corresponding author: [email protected]; [email protected] (Saka, MG).
Department of Forestry and Wildlife Management, Modibbo Adama University of Technology, Yola, Nigeria.
✉ Corresponding author: [email protected]; [email protected] (Saka, MG).
Abstract
The study evaluates the mean annual increment (MAI) and optimal rotation age for the sustainable management of eucalyptus plantation in Afaka Forest reserve, Nigeria. To achieve the objectives of this study, the forest reserve was stratified into four age series. Fifty (50) sample plots (20 m X 20 m) were randomly laid across the four age series in the entire plantation. Variable of interest were measured in each of the compartments. The species volume per plot was estimated using Newton’s formula, and the yield (volume) with age of the species was generated using an exponential function, while the optimal rotation age was obtained when MAI was maximum. The annual allowable cut was determined using both area and volume control methods. The results show that E. camaldulensis has the highest mean volume (392.841 m3), while the least species volume of 281.217m3 was estimated for E. cloeziana. The maximum mean annual increment (MMAI) ranges between 7.321 to 19.323 (m3/ha/yr) across the four sampled compartments. The optimal rotation age ranges between 19 and 42 years, while the total number of trees available for cut ranges between 794 and 7,408 for E. cloeziana and E. camaldulensis species, respectively. This study has shown that mean annual increment and rotation age are of fundamental importance in forest business and shaping of stands future (harvest regulation) for sustainable management.
Key Words: Stratified, Evaluates, Plantation, Allowable cut, Age series and Compartment
The study evaluates the mean annual increment (MAI) and optimal rotation age for the sustainable management of eucalyptus plantation in Afaka Forest reserve, Nigeria. To achieve the objectives of this study, the forest reserve was stratified into four age series. Fifty (50) sample plots (20 m X 20 m) were randomly laid across the four age series in the entire plantation. Variable of interest were measured in each of the compartments. The species volume per plot was estimated using Newton’s formula, and the yield (volume) with age of the species was generated using an exponential function, while the optimal rotation age was obtained when MAI was maximum. The annual allowable cut was determined using both area and volume control methods. The results show that E. camaldulensis has the highest mean volume (392.841 m3), while the least species volume of 281.217m3 was estimated for E. cloeziana. The maximum mean annual increment (MMAI) ranges between 7.321 to 19.323 (m3/ha/yr) across the four sampled compartments. The optimal rotation age ranges between 19 and 42 years, while the total number of trees available for cut ranges between 794 and 7,408 for E. cloeziana and E. camaldulensis species, respectively. This study has shown that mean annual increment and rotation age are of fundamental importance in forest business and shaping of stands future (harvest regulation) for sustainable management.
Key Words: Stratified, Evaluates, Plantation, Allowable cut, Age series and Compartment
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MLA
Saka, M. G. “Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria”. International Journal of Forestry, Ecology and Environment, 05(01) (2021): 187-194.
APA
Saka, M. G. (2021). Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 05(01), 187-194.
Chicago
Saka, M. G. “Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria”. International Journal of Forestry, Ecology and Environment, 05(01) (2021): 187-194.
Harvard
Saka, M. G. 2021. Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 05(01), pp. 187-194.
Vancouver
Saka, MG. Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 2021 July 05(01): 187-194.
Saka, M. G. “Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria”. International Journal of Forestry, Ecology and Environment, 05(01) (2021): 187-194.
APA
Saka, M. G. (2021). Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 05(01), 187-194.
Chicago
Saka, M. G. “Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria”. International Journal of Forestry, Ecology and Environment, 05(01) (2021): 187-194.
Harvard
Saka, M. G. 2021. Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 05(01), pp. 187-194.
Vancouver
Saka, MG. Determination of mean annual increment and optimal rotation age for sustainable management of eucalyptus species in Afaka forest reserve, Nigeria. International Journal of Forestry, Ecology and Environment, 2021 July 05(01): 187-194.
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