Document Type : Original Research Article
Authors
Forestry and Timber Trees Dept., Hort. Res. Inst., Agric. Res. Center, Giza, Egypt
Abstract
Countries around the world are currently affected by the consequences of climate change and global warming. One of the available solutions is to increase awareness of the importance of afforestation and forest establishment. This study was devised in the New Administrative Capital, East Cairo, Egypt, during the three years of 2022, 2023 and 2024 to evaluate the growth performance as well as sequestered carbon and CO2 of five woody tree species irrigated with treated sewage water. Five tree species, namely Khaya senegalensis, Cupressus sempervirens, Corymbia citriodora, Eucalyptus camaldulensis and Casuarina sp., were planted at a distance of 2 × 2 m and irrigated by drip irrigation. The obtained results showed that these trees gave good growth performance in terms of height, diameter, biomass, basal area and tree volume. However, the highest height growth was detected with E. camaldulensis, followed by C. citriodora and Casuarina sp. in the different records during the three years. Also, the highest root collar diameter and diameter at breast height were recorded in E. camaldulensis, followed by C. citriodora and Casuarina sp. Also, the highest total fresh and dry biomass, sequestered carbon and CO2 were estimated in E. camaldulensis, followed by Casuarina sp. and C. citriodora. The highest basal area and total volume were estimated in E. camaldulensis, followed by C. citriodora and Casuarina sp. In addition, the highest N, P and K percentages in leaves were measured in E. camaldulensis, followed by C. citriodora and Casuarina sp. All these data had been recorded after three years of planting. By absorbing carbon dioxide and releasing oxygen into the atmosphere, this tree species, which has a high wood value, biomass, and carbon stock, has a significant potential to control climate change. As part of Egypt's afforestation efforts, it may also be planted more extensively, especially in new cities.
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