Understanding the structure and regeneration of forest resources contributes to identifying the elements of diversity, endemism, threatened and endangered species. This study was conducted in the western escarpment of the Rift valley of the Gamo Zone, Southern Ethiopia. The main objective was to investigate structure and regeneration status of the study area. A systematic sampling method was used to collect vegetation data from a total 102 quadrats, each 20 × 20 m (400 m2) and five 1 × 1 m (1 m2) sub-quadrats were established at the four corners and at the centre for sapling and seedling estimation. Tree and shrub species were listed; Height (H ≥ 1.5 m) and DBH ≥ 2 cm were measured and recorded. R-statically software and Microsoft Excel were used to record and analyse the data. A total of 126 plant species belonging to 43 families and 90 genera were identified. The most dominant families were Fabaceae, followed by Anacardiaceae and Euphorbiaceae. Most frequent species were Euclea divinorum (84.3%), followed by Rhus natalensis (83.3%), Terminalia brownii (74.5%). DBH class ≤ 5cm had highest density (63.6%) and DBH ≥ 25.1 cm had the lowest density (0.87%). Three population patterns have been observed; inverted J, J-shaped and irregular shaped. 93% of species had IVI values b/n 1 - 4, 65% of species IVI values < 1% and 7% of species had IVI values ≥ 5.28. Pappea capensis, Combretum molle, Terminalia brownii, Euclea divinorum had highest IVI values. In the vertical stratification, lower story was 91.3% of the individuals. Only a few species contributed to the high density of saplings (440.2/ha) and seedlings (825.49/ha) while most had very little or no saplings and seedlings at all. Thus, in order to revert the current forest structure and regeneration to the previous natural state, it is considered important to minimize the influence of the human interference, grazing and raising awareness to surrounding community.
References
[1]
Friis, I., Demissew, S. and van Breugel, P. (2010) Atlas of the Potential Vegetation of Ethiopia. The Royal Danish Academy of Sciences and Letters, Copenhagen.
[2]
Demissew, S. and Friis, I. (2009) Nature Vegetation of the Flora Area. In: Hedberg, I., Friis, I. and Persson, E., Eds., Flora of Ethiopia and Eritrea Eritrea, Vol. 8, National Herbarium, Addis Abeba University, Addis Abeba, 27-32.
[3]
Gebre Kirstos, S. (1984) An Ecological Study of the Vegetation on the Eastern Escarpment of Eritrea, Ethiopia. Addis Ababa.
[4]
White, F. (1983) The Vegetation of Africa: A Discriptive Memoir to Accompany the 56 UNESCO/AETFAT/UNESCO Vegetation Map of Africa. Natural Resource Research 20, United Nations Educational, Scientific and Cultural Organization, Paris.
[5]
Temesgen, F., Warkineh, B. and Ababa, A. (2018) Biodiversity Status & Conservation Challenges of Protected Areas of Ethiopia: Awash & Nechsar National Parks in Focus. Journal of Natural Sciences Research, 8, 46-61.
[6]
Amberber, M., Argaw, M., Feyisa, G.L. and Degefa, S. (2020) Status, Approaches, and Challenges of Ecosystem Services Exploration in Ethiopia: A Systematic Review. Chinese Journal of Population, Resources and Environment, 18, 201-213. https://doi.org/10.1016/j.cjpre.2019.07.001
[7]
Asefa, M., Cao, M., He, Y., Mekonnen, E., Song, X. and Yang, J. (2020) Ethiopian Vegetation Types, Climate and Topography. Plant Divers, 42, 302-311. https://doi.org/10.1016/j.pld.2020.04.004
[8]
Nyssen, J., Poesen, J., Moeyersons, J., Deckers, J., Haile, M. and Lang, A. (2004) Human Impact on the Environment in the Ethiopian and Eritrean Highlands—A State of the Art. Earth-Science Reviews, 64, 273-320. https://doi.org/10.1016/S0012-8252(03)00078-3
[9]
Wood, A.P. and Stahl, M. (1997) Ethiopia: National Conservation Strategy, Phase I Report. International Union for Conservation of Nature, Addis Ababa.
[10]
Food and Agriculture Organization of the United Nations (2001) World Wide Agroclimatic Data Base. CD-ROM FAO Clim 2. Food and Agriculture Organization of the United Nations, Rome.
[11]
Food and Agriculture Organization of the United Nations (2010) Global Forest Resource Assessment. Food and Agriculture Organization of the United Nations, Rome.
[12]
Dessie, G. and Kleman, J. (2007) Pattern and Magnitude of Deforestation in the South Central Rift Valley Region of Ethiopia. Mountain Research and Development, 27, 162-168. https://doi.org/10.1659/mrd.0730
[13]
Husen, A., Mishra, V.K., Semwal, K. and Kumar, D. (2012) Biodiversity Status in Ethiopia and Challenges. Environmental Pollution and Biodiversity, 1, 31-79.
[14]
Tolera, M., Asfaw, Z., Lemenih, M. and Karltun, E. (2008) Woody Species Diversity in a Changing Landscape in the South-Central Highlands of Ethiopia. Agriculture, Ecosystems & Environment, 128, 52-58. https://doi.org/10.1016/j.agee.2008.05.001
[15]
European Federation for Agricultural Recycling (EFAR) (1994) Ethiopian Forestry Action Program: The Challenge for Development. Final Report, Volume II, Ministry of Natural Resources Development and Environmental Projection, Addis Ababa. European Federation for Agricultural Recycling, Addis Ababa.
[16]
Craft, C. (2002) Methods for Evaluating Wetland Condition #16: Vegetation-Based Indicators of Wetland Nutrient Enrichment. Office of Water, U.S. Environmental Protection Agency, Washington DC, EPA-822-R-02-020.
[17]
Food and Agriculture Organization of the United Nations (2008) Forests, Deforestation and Forest Degradation: Most frequently Asked Questions. FAO Advisory Committee on Paper and Wood Products, Bakubung. Food and Agriculture Organization of the United Nations, South Africa.
[18]
National Biodiversity Strategies and Action Plans (NBSAPs) (2005) National Biodiversity Strategy and Action Plan. National Biodiversity Strategies and Action Plans, Addis Ababa.
[19]
Awas, T., Bekele, T. and Demissew, S. (2001) An Ecological Study of the Vegetation of Gambella Region, Southwestern Ethiopia. SINET: Ethiopian Journal of Science, 24, 213-228. https://doi.org/10.4314/sinet.v24i2.18187
[20]
Wana, D. and Woldu, Z. (2006) Vegetation of Chencha Highlands in Southern Ethiopia. SINET: Ethiopian Journal of Science, 28, 109-118. https://doi.org/10.4314/sinet.v28i2.18247
[21]
CSA Group (2019) Summary and Statistical Report of the Population and Housing Census. CSA Group, Addis Ababa.
[22]
Mateos, A., Jiménez, A. and Ríos-Insua, S. (2003) Solving Dominance and Potential Optimality in Imprecise Multi-Attribute Additive Problems. Reliability Engineering and System Safety, 79, 253-262. https://doi.org/10.1016/S0951-8320(02)00237-5
[23]
Coker, P. and Kent, M. (2001) Vegetation Description and Analysis: A Practical Approach Review by: Petr Smilauer. Folia Geobotanica, 36.
[24]
Stohlgren, A.T.J., Falkner, M.B., Schell, L.D., Vegetatio, S. and Apr, N. (2012) A Modified-Whittaker Nested Vegetation Sampling Method Reviewed Work(s): A Modified-Whittaker Nested Vegetation Sampling Method. Vegetatio, 117, 113-121. https://doi.org/10.1007/BF00045503
[25]
Hines, J.E., Latour, P.B., Squires-Taylor, C. and Moore, S. (2011) The Effects on Lowland Habitat in the Banks Island Bird Sanctuary Number 1, Northwest Territories, by the Growing Colony of Lesser Snow Geese (Chen Caerulescens caerulescens). Environment Canada Occasional Paper No. 118, Environment Canada, Canadian Wildlife Service, Edmonton, 8-26.
[26]
Zerihun I. and Backéus, W. (1991) The Shrub Land Vegetation in Western Shewa, Ethiopia and Its Possible Recovery. Journal of Vegetation Science, 2, 73-180. https://doi.org/10.2307/3235949
[27]
Kidane, L., Nemomissa, S. and Woldu, Z. (2016) The Effects of Disturbance on the Population Structure and Regeneration Potential of Five Dominant Woody Species—In Hugumburda-Gratkhassu National Forest Priority Area, North-Eastern Ethiopia. African Journal of Ecology, 54, 20-28. https://doi.org/10.1111/aje.12254
[28]
Yeshitela, K. and Bekele, T. (2002) Plant Community Analysis and Ecology of Afromontane and Transitional Rainforest Vegetation of Southwestern Ethiopia. SINET: Ethiopian Journal of Science, 25, 155-175. https://doi.org/10.4314/sinet.v25i2.18078
[29]
Venkateswaran, R. and Parthasarathy, N. (2003) Tropical Dry Evergreen Forests on the Coromandel Coast of India: Structure, Composition and Human Disturbance. Ecotropica, 9, 45-58.
[30]
Woldu, Z., Feoli, E. and Nigatu, L. (1989) Partitioning an Elevation Gradient of Vegetation from Southeastern Ethiopia by Probabilistic Methods. Vegetatio, 81, 189-198. https://doi.org/10.1007/BF00045524
[31]
Edwards, S.D., Edwards, S., Tadesse, M., Demissew, S. and Phillips, S. (1995) Flora of Ethiopia and Eritrea. Vol. 2, Addis Ababa University, Addis Ababa; Uppsala University, Uppsala.
[32]
Sebseb. D. and Edwards, H.I. (1997) Flora of Ethiopia and Eritrea: Hydrocharitaceae-Arecaceae. Vol. 6, Addis Ababa University, Addis Ababa; Uppsala University, Uppsala.
[33]
Hedberg, I., Kelbessa, E., Edwards, S. and Demissew, S. (2006) Flora of Ethiopia and Eritrea: Gentianaceae Cyclocheilaceae. Vol.5, Addis Ababa University, Addis Ababa; Uppsala University, Uppsala.
[34]
Hedberg, I., Edwards, S. and Nemomissa, S. (2003) Flora of Ethiopia and Eritrea: Magnoliaceae Flacourtiaceae. Vol. 4, Addis Ababa University, Addis Ababa; Uppsala University, Uppsala
[35]
Schmid, R. (1998) Review of Flora of Ethiopia and Eritrea. Vol. 6. Hydrocharitaceae to Arecaceae; Flora of Ethiopia and Eritrea. Vol. 2, Pt. 2. Canellaceae to Euphorbiaceae; Flora of Ethiopia and Eritrea. Vol. 7. Poaceae (Gramineae); Flora of Ethiopia. Vol. 3. Pittosporaceae to Araliaceae; Some Endemic Plants of Ethiopia, by S. Edwards, S. Demissew, I. Hedberg, M. Tadesse, I. Hedberg, & S. Phillips. Taxon, 47, 779-780. https://doi.org/10.2307/1223616
[36]
Hedberg, I., Friis, I. and Edwards, S. (Eds.) (2004) Flora of Ethiopia and Eritrea: Asteraceae (Compositae). Vol. 4, Part 2, The National Herbarium, Addis Ababa.
[37]
Lamprecht, H. (1989) Silvic Culture in the Tropics. Tropical Forest Ecosystems and Their Tree Species Possibilities and Methods for Their Long-Term Utilization. TZ-Verlag, Roßdorf.
[38]
Khan, M.L., Rai, J.P.N. and Tripathi, R.S. (1987) Population Structure of Some Tree Species in Disturbed and Protected Subtropical Forests of North-East India. Acta Oecologica/Oecologia Appl, 8, 247-255.
[39]
Tadese, S., Soromessa, T., Bekele, T. and Gebeyehu, G. (2021) Woody Species Composition, Vegetation Structure, and Regeneration Status of Majang Forest Biosphere Reserves in Southwestern Ethiopia. International Journal of Forestry Research, 2021, Article ID: 5534930. https://doi.org/10.1155/2021/5534930
[40]
Kelbessa, E. and Demissew, S. (2014) Diversity of Vascular Plant Taxa of the Flora of Ethiopia and Eritrea. Ethiopian Journal of Biological Sciences, 13, 37-45.
[41]
Kelbessa, E. and Soromessa, T. (2011) Interfaces of Regeneration, Structure, Diversity and Uses of Some Plant Species in Bonga Forest: A Reservoir for Wild Coffee Gene Pool. SINET: Ethiopian Journal of Science, 31, 121-134. https://doi.org/10.4314/sinet.v31i2.66565
[42]
Boz, G. and Maryo, M. (2020) Woody Species Diversity and Vegetation Structure of Wurg Forest, Southwest Ethiopia. International Journal of Forestry Research s, 2020, Article ID: 8823990. https://doi.org/10.1155/2020/8823990
[43]
Ahmed, E., Ali, S. and Addisu, A. (2017) Structure and Regeneration Status of Woody Plants in the Hallideghie Wildlife Reserve, North East Ethiopia. International Journal of Biodiversity and Conservation, 9, 200-211. https://doi.org/10.5897/IJBC2017.1085
[44]
Fikadu, E., Melesse, M. and Wendawek, A. (2014) Floristic Composition, Diversity and Vegetation Structure of Woody Plant Communities in Boda Dry Evergreen Montane Forest, West Showa, Ethiopia. International Journal of Biodiversity and Conservation, 6, 382-391. https://doi.org/10.5897/IJBC2014.0703
[45]
Senbeta, F. and Teketay, D. (2001) Regeneration of Indigenous Woody Species under the Canopies of Tree Plantations in Central Ethiopia. Tropical Ecology, 42, 175-185.
[46]
Senbeta, F., Woldemariam, T., Demissew, S. and Denich, M. (2009) Floristic Diversity and Composition of Sheko Forest, Southwest Ethiopia. Ethiopian Journal of Biological Sciences, 6, 11-42. https://doi.org/10.4314/ejbs.v6i1.39038
[47]
Lemessa, D. (2017) Woody Species Composition in Relation to Spatial and Environmental Gradients in Acacia-Commiphora Vegetation Ecosystem of Ethiopia. International Journal of Natural Resource Ecology and Management, 2, 53-59. https://doi.org/10.11648/j.ijnrem.20170203.12
[48]
Abate, T., Ebro, A. and Nigatu, L. (2012) Evaluation of Woody Vegetation in the Rangeland of Southeast Ethiopia. International Research Journal of Agricultural Science and Soil Science, 2, 113-126.
[49]
Senbeta, F. and Teketay, D. (2003) Diversity, Community Types and Population Structure of Woody Plants in Kimphe Forest, a Virgin Nature Reserve in Southern Ethiopia. Ethiopian Journal of Biological Sciences, 2, 169-187.
[50]
Senbeta, F., Schmitt, C., Woldemariam, T. and Denich, M. (2014) Plant Diversity, Vegetation Structure and Relationship between Plant Communities and Environmental Variables in the Afromontane Forests of Ethiopia. SINET: Ethiopian Journal of Science, 37, 113-130.
[51]
Ayalew, T., Merawi, E. and Alemu, S. (2019) Woody Plant Species Diversity of Shello Giorgis Dry Afromontane Forest, Farita District, West Amhara, Ethiopia. Biodivers. Ecology and Evolutionary Biology, 4, 60-71. https://doi.org/10.11648/j.eeb.20190404.13
[52]
Khumbongmayum, A., Khan, M. and Tripathi, R. (2005) Ethnomedicinal Plants in the Sacred Groves of Manipur. Indian Journal of Traditional Knowledge, 4, 21-32.
[53]
Good, N.F. and Good, R.E. (1972) Population Dynamics of Tree Seedlings and Saplings in a Mature Eastern Hardwood Forest. Bulletin of the Torrey Botanical Club, 99, 172-178. https://doi.org/10.2307/2484571
[54]
Denu, D. (2007) Floristic Composition and Ecological Study of Bibita Forest (Gura Ferda), Southwest Ethiopia. MSc. Thesis, Addis Ababa University, Addis Ababa.
[55]
Shibru, S. and Balcha, G. (2004) Composition, Structure and Regeneration Status of Woody Species in Dindin Natural Forest, Southeast Ethiopia: An Implication for Conservation. Ethiopian Journal of Biological Science, 3, 15-35.
[56]
Dibaba, A., Soromessa, T., Kelbessa, E. and Tilahun, A. (2014) Diversity, Structure and Regeneration Status of the Woodland and Riverine Vegetation of Sire Beggo in Gololcha District, Eastern Ethiopia. Momona Ethiopian Journal of Science, 6, 70-96. https://doi.org/10.4314/mejs.v6i1.102416
[57]
Tilahun, A. (2018) Vegetation Ecology and Carbon Stock of Wof-Washa Forest, North Vegetation Ecology and Carbon Stock of Wof-Washa Forest, North Shewa Zone, Amhara Region, Ethiopia (Thesis). Addis Ababa University, Addis Ababa.
[58]
Ahmedin, A. and Eliasb, E. (2020) Tree Species Composition, Structure and Regeneration Status in Munessa Natural Forest, South-Eastern Ethiopia. Eurasian Journal of Forest Science, 8, 21-39. https://doi.org/10.31195/ejejfs.622956
[59]
Berhanu, A., Demissew, S., Woldu, Z. and Didita, M. (2017) Woody Species Composition and Structure of Kuandisha Afromontane Forest Fragment in North-Western Ethiopia. Journal of Forestry Research, 28, 343-355. https://doi.org/10.1007/s11676-016-0329-8
[60]
Fisaha, G., Hundera, K. and Dalle, G. (2013) Woody Plants’ Diversity, Structural Analysis and Regeneration Status of Wof Washa Natural Forest, North-East Ethiopia. African Journal of Ecology, 51, 599-608. https://doi.org/10.1111/aje.12071
