Biodiversity conservation in the sacred groves of north-west Ethiopia: diversity and community structure of woody species

Land use and land cover changes, and woody vegetation status of the Tsimur Gebriel Monastery in Northern Ethiopia

Ethiopian Orthodox churches are significant habitats for endemic and threatened plant species, yet their vegetation status and the land use systems impacting them, are little known. Therefore, this study assessed the land use and land cover changes (LULCC) within a 3 km buffer area and the woody vegetation status of the Tsimur Gebriel Monastery in the Tigray region, Northern Ethiopia. The United States Geological Survey's multi-dated (1986, 1999, and 2018) Landsat imagery was used for LULCC analysis. A supervised classification technique was employed for image classification using a maximum likelihood algorithm. Systematic sampling techniques were used to collect vegetation data (tree species, height, and DBH), using 20 sample plots (20 × 20 m) distanced 100 m apart. The results highlighted that among the five identified LULCC types in the buffer zone of the monastery, the farmland area has expanded from 56 to 78 % at the expense of shrublands between 1986 and 2018. At the monastery, 19 woody tree species from 13 families were identified, with an evenness of 0.5 and a Shannon diversity index of 2.4. The stem density was 336 stems per hectare, and the forest cover was approximately 65 %. Olea europaea was the dominant tree species, while Juniperus procera showed a lack of regeneration at the monastery. Despite the fair natural regeneration, the monastery exhibited lower species diversity, richness, and evenness. However, the monastery remains an important habitat for rare and threatened tree species and may supply seeds for the restoration of degraded lands. Therefore, establishing exclosures in the buffer zone, strengthening stone walls and enrichment planting of degraded tree species should be implemented to ensure the sustainable conservation of valuable tree species.

The state-of-the-art and future research directions on sacred forests and ecosystem services

The importance of forests in providing a healthy environment and good quality of life for people is crucial. Sacred forests, in particular, play a significant role in the social and ecological aspects of life. Despite numerous studies and reports on the subject, there is a lack of an up-to-date and comprehensive analysis of research on sacred forests and their ecosystem services. Our review looked at 2811 papers from the Scopus database using keyword selection. After screening, 214 papers were used for bibliometric analysis to assess the research trends and distribution of studies done on the contribution of sacred forests to various ecosystem services. Seventy-seven publications focusing on cultural ecosystem services, biodiversity conservation, and carbon accumulation that met our eligibility criteria were chosen for detailed analysis of the methodological flows and gaps in the literature. The results revealed that studies on the subject are increasing, notably in developing countries. However, very limited investigations can be observed in the urban context. Furthermore, we discovered that most studies used field surveys to grasp sacred forests' ecological aspects. While this technique gave a thorough understanding of the forests, future research should use a combination of methods, including remote sensing, geospatial analysis, and social surveys, to better understand the forests and the ecosystem services they provide. Future studies ought to evaluate the multiple regulative services and non-material benefits of sacred forests to ensure long-term human well-being and provide scientific proof for acknowledging and conserving these critical places are required particularly in urban landscapes. Overall, more research is required to comprehend these gaps in a broader context and enhance our overall view of conservation and sociocultural significance, both of which are critical for long-term practice.