Aboveground biomass, growth and yield for some selected introduced tree species, namely Cupressus lusitanica, Eucalyptus saligna, and Pinus patula in Central Highlands of Ethiopia

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Abstract Background Species of the generaEucalyptus,Cupressus, andPinusare the most widely planted tree species in the country in general and in Chilimo dry Afromontane forest in particular. Eucalyptus covers 90% of the total planted forest area in the country. However, only limited information exists in the country regarding aboveground biomass (AGB), belowground biomass (BGB), growth, and yield. This study was conducted to assess the variables on 25 and 30 years of age for three planted species:Cupressus lusitanica,Eucalyptus saligna, andPinus patulain Chilimo plantation forest, in the Central Highlands of Ethiopia. A two-times inventory was conducted in 2012 and 2017. A total of nine square sampled plots of 400 m2each, three plots underCupressus lusitanica, 3Eucalyptus saligna, and 3Pinus patulawere used for data collection. Data on height, diameter, soil, and tree stumps were collected. Percent C, % N, and bulk density was performed following chemical procedure. Results The aboveground biomass ranged from 125.76 to 228.67 t C ha−1and the basal area and number of stems from 3.76 to 25.50 m2 ha−1and 483 to 1175 N ha−1, respectively. The mean annual basal area and volume increment were between 0.97 and 1.20 m2 ha−1 year−1and 10.79 and 16.22 m3 ha−1 year−1. Both carbon and nitrogen stock of the planted forest was non-significant among the tree species. Conclusion The aboveground biomass, growth, and yield significantly varied among the species.Cupressus lusitanicahad the highest aboveground biomass, volume, and basal area, whileEucalyptus salignahad the lowest value .To a depth of 1 m, total carbon stored ranged from 130.13 to 234.26 t C ha−1. The total annual carbon sequestration potential was 12,575.18 t CO2eq.Eucalyptus has the highest carbon stock density and growth rate than other species.

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