Effect of exclosure ages on woody plant structure,diversity and regeneration potential in the western Tigray region of Ethiopia  

作　　者：Tsegay Gebregerges Zewdu K.Tessema Emiru Birhane 

机构地区：[1]Shire-Maytsebri Agricultural Research Center,PO Box 81,Shire,Ethiopia [2]Rangeland Ecology and Biodiversity Program,School of Animal and Range Sciences,College of Agriculture and Environmental Sciences,Haramaya University,PO Box 138,Dire Dawa,Ethiopia [3]Department of Land Resources Management and Environmental Protection,College of Dryland Agriculture and Natural Resources,Mekelle University,PO Box 390,Mekelle,Ethiopia [4]Department of Ecology and Natural Resource Management,Norwegian University of Life Sciences,PO Box 5003,1432 As,Norway

出　　处：《Journal of Forestry Research》2018年第3期693-703,共11页林业研究（英文版）

基　　金：the financial support of Tigray Agricultural Research Institute and Humera Agricultural Research Center,northern Ethiopia

摘　　要：Exclosure is a method of rehabilitating degraded lands by protecting them from the interference of animals and from human encroachment, and is used to regenerate native vegetation as a way to reduce soil erosion, increase rain water infiltration and provide fodder and woody biomass in degraded grazing lands. Therefore, we studied woody plant structure, diversity and regeneration potentials in 5-and 10-year grazing exclosures in comparison with open grazed sites in a semi-arid environment. Data on species diversity, abundance, structure, basal area, frequency, density, and regeneration status were collected from 270 sample plots. Forty-one woody species representing 20 families were identified, with 18, 28 and 38 species found in open grazed areas, and in 5-and 10-year grazing exclosures, respectively. The 10-year grazing exclosures had a higher(P <0.05) species richness and plant densities compared to the 5-year grazing exclosures and the open grazed areas. The population structure and regeneration status of woody species in both grazing exclosures showed an inverted J-shape, indicating a healthy regeneration status, whereas hampered regeneration was observed in open grazed areas. The establishment of grazing exclosures had positive effects in restoring woody plant diversity and improving vegetation structure and regeneration potentials of degraded grazing lands.Exclosure is a method of rehabilitating degraded lands by protecting them from the interference of animals and from human encroachment, and is used to regenerate native vegetation as a way to reduce soil erosion, increase rain water infiltration and provide fodder and woody biomass in degraded grazing lands. Therefore, we studied woody plant structure, diversity and regeneration potentials in 5-and 10-year grazing exclosures in comparison with open grazed sites in a semi-arid environment. Data on species diversity, abundance, structure, basal area, frequency, density, and regeneration status were collected from 270 sample plots. Forty-one woody species representing 20 families were identified, with 18, 28 and 38 species found in open grazed areas, and in 5-and 10-year grazing exclosures, respectively. The 10-year grazing exclosures had a higher(P <0.05) species richness and plant densities compared to the 5-year grazing exclosures and the open grazed areas. The population structure and regeneration status of woody species in both grazing exclosures showed an inverted J-shape, indicating a healthy regeneration status, whereas hampered regeneration was observed in open grazed areas. The establishment of grazing exclosures had positive effects in restoring woody plant diversity and improving vegetation structure and regeneration potentials of degraded grazing lands.

关 键 词：Basal area DIVERSITY Important value index Population structure Regeneration status Species composition EXCLOSURES 

分 类 号：S7[农业科学—林学]