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Statistical relationship between leaf litter and tree growth characteristics of Tectona grandis species

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Eguakun F. S., Job M.

World News of Natural Sciences

2018

vol. 18

issue 2

252-261

Forest productivity relies on the quantity and quality of litter as this influences nutrient cycling in the ecosystem. Many studies have been carried out on litter fall, but few attempts has been made to relate litter fall nutrient content with tree growth variables The aim of this work was to investigate basic relationships between the leaf litter nutrient content of Tectona grandis and tree growth characteristics. The study was done at the arboretum of the Department of Forestry and Wildlife Management, University of Port Harcourt, Rivers State, Nigeria. Data were collected from four (4) randomly selected 20m × 20m (0.04ha) plots. Within each plots, four (4) litter traps at 8m apart was set at random to collect litter on a weekly basis, while tree growth variables were measured on trees around the trap. The collected litter was put into zip-lock bags and taken to the laboratory for nutrient content analysis. Nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sodium (Na), magnesium (Mg) content and pH were included in this. The result shows that the average weekly leaf litter collected from the trap was 11.8g. In terms of average nutrient content, Nitrogen had the highest average at 1.8, while Sodium (Na) had the lowest value at 0.14. Among the tree growth variables, only height had a positive correlation with litter collected. The results also show that Nitrogen micronutrient content was related to the amount of litter collected (0.536). In addition, all the exchangeable base analysed in the study were also related to the amount of litter collected. Conclusively, the amount of litter produced is a major indicator of primary productivity because as litter quantity increases, available nutrient content for plant growth also increases, hence, having influence on tree height.

Maximizing the Role of African Forest for Climate Change Mitigation and Socioeconomic Development

100%

Oyewole S. O., Ishola B. F., Aina-Oduntan O. A.

World News of Natural Sciences

2019

vol. 27

11-21

Forestry has a significant role to play in green economy transformation process of African Continent. It is important to provide strong rationale that will link the forest to economic development. This paper therefore provides useful information on the potential of forest resources for socio-economic improvement with emphasize on the status of African forest. The paper reviewed the role of forest in climate change mitigation and achievement of Sustainable Development Goals as well as the role of forest in attaining industrialization. It was revealed that Central Africa has highest forest area with North Africa having lowest forest area. However, in terms of planted forest North Africa has highest area while Central Africa has lowest area. More so through sustainable management of forest some SDGs can be achieved. Forest is found to be useful approach in climate change mitigation through carbon sequestration. The strategies that can be adopted to improve the status of African forest include sustainable management of forest resources, afforestation and improved agroforestry practices. The paper recommends policy strategy that will re-position forestry subsector in order to achieve its primary roles in the climate change mitigation, economy and promote agroforestry to increase forest cover.

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2 World News of Natural Sciences

1 2019

1 2018

1 Aina-Oduntan O. A.

1 Eguakun F. S.

1 Ishola B. F.

1 Job M.

1 Oyewole S. O.

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Statistical relationship between leaf litter and tree growth characteristics of Tectona grandis species

Maximizing the Role of African Forest for Climate Change Mitigation and Socioeconomic Development