Trees, Forests and People (Jun 2024)
Woody species diversity, structure and regeneration status of the church forests in West Gojjam Zone, Northwestern Ethiopia
Abstract
Ethiopia's diverse ecology faces challenges from significant deforestation. Church forests are relatively protected although under pressure from agricultural expansion, grave house construction and climate related factors. The present study was aimed to assess the woody species composition, structure and regeneration status of church forests in the West Gojjam Zone. Twenty-six church forests were selected using stratified random sampling based on agroecology, elevation, forest size, and distance from population centers. A total of 175 main plots of 20 m × 20 m (400 m2) for trees, 875 subplots of 5 m × 25 m (25 m2) for saplings, and 875 subplots of 1 m × 21 m (1 m2) for seedlings were laid down. Diameter at breast height (DBH) was measured for woody plants with a DBH ≥2.5 cm and also height ≥ 2.5 m. Diversity and structural analysis of the woody species were carried out using appropriate tools. The regeneration status of the study forests was evaluated based on the number of seedlings, sapling and matured plants. A total of 111 woody species that belong to 95 genera and 51 families with 72 (64.86 %) trees, 23 (20.72 %) shrubs, 8 (7.2 %) shrubs/trees and 8 (7.2) lianas were identified. In the study sites, the woody plant species consist of 82.88 % indigenous, 15.32 % exotic, and 1.8 % endemic species. Fabaceae was the dominant family in West Gojjam zone church forests. The Shannon diversity ranged from 0.99 to 3.47, with an average of 2.55, and evenness varied from 0.5 to 0.96 (average 0.82). Species richness ranged from 7 to 45 with the average value of 23.81, and a total stem density of 5880 individuals per hectare. Additionally, 5923 saplings and 6136 seedlings per hectare were recorded. The most abundant species include Eucalyptus camaldulensis, Calpurnia aurea, and Juniperus procera. The average basal area was 29.268 m²/ha for the studied church forests, with Ficus vasta having the highest basal area. Juniperus procera and Rhus vulgaris exhibited the highest Importance Value index (IVI), while Premna schimperi, and Myrtus communis had the lowest IVI. The overall regeneration status of west Gojjam church forests was found to be good. Significant differences in woody species composition and diversity were observed between church forests. The study revealed the importance of church forests in the West Gojjam Zone for plant diversity conservation, revealing their resilience and potential for sustainable protection of forests despite the challenges like deforestation and climate change, and their potential for sustainable maintenance. As we have already seen, some of the church's forests were converted to agriculture as a source of income for the church. This practice is dangerous for the survival of the endemic plants in the church forests and leads to deforestation. Therefore, it is recommended to form an alternative source of income for the church.
