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Tree species diversity predicts aboveground carbon storage through functional diversity and functional dominance in the dry evergreen Afromontane forest of Hararghe highland, Southeast Ethiopia

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Ecological Processes 2021年第1期10卷 619-633页

作者： Mengistu Teshome Wondimu Zebene Asfaw Nigussie Muktar Mohammed Yusuf Wondo Genet College of Forestry and Natural Resources Hawassa UniversityHawassaEthiopia. College of Natural Resources and Environmental Science Oda Bultum UniversityChiroEthiopia.

Background:Regarding the most important ecological challenges,scientists are increasingly debating the relationship between biodiversity and ecosystem *** this,several experimental and theoretical researches have shown inconsistencies in biodiversity and ecosystem function relationships,supporting either the niche complementarity or selection effect *** relationship between species diversity,functional diversity,and aboveground biomass carbon was investigated in this study employing standing aboveground carbon(AGC)stock as a proxy measure for ecosystem *** hypothesized that(i)effects of diversity on AGC can be transmitted through functional diversity and functional dominance;(ii)effects of diversity on AGC would be greater for functional dominance than functional diversity;and(iii)effects of functional diversity and functional dominance on carbon stock varied with metrics and functional ***-weighted means(CWM)of functional traits(wood density,specific leaf area,and maximum plant height)were calculated to assess functional dominance(selection effects).As for functional diversity(complementarity effects),multi-trait functional diversity(selection effects)indices were *** tested the first hypothesis using structural equation *** the second hypothesis,the effects of environmental variables such as slope,aspect,and elevation were tested first,and separate linear mixed-effects models were fitted afterward for functional diversity,functional dominance,and the two ***:Results revealed that slope had a significant effect on aboveground carbon *** diversity and functional dominance were significant predictors of the aboveground carbon storage(22.4%)in the dry evergreen Afromontane *** effects of species richness on aboveground carbon storage were mediated by functional diversity and functional dominance of *** shows that both the selection effects and the niche complement

关键词： Community-weighted mean Mixed-effect model Niche complementarity Selection effect Structural equation modeling

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Assessment of land suitability for oilseeds crops(sesame and groundnut)using geospatial techniques:In the case of Diga district,East Wollega zone,western Ethiopia

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Oil Crop Science 2022年第3期7卷 127-134页

作者： Mitiku Badasa Moisa Biratu Bobo Merga Bacha Temesgen Gabissa Dessalegn Obsi Gemeda Department of Agricultural Engineering Faculty of TechnologyWollega UniversityShambu CampusEthiopia Department of Geographic Information System Institute of Land AdministrationOda Bultum UniversityEthiopia Department of Fisheries and Aquatic Sciences Faculty of AgricultureWollega UniversityShambu CampusEthiopia Department of Natural Resource Management College of Agriculture and Veterinary MedicineJimma UniversityEthiopia

Sesame and groundnut crops are the major oilseed crops produced for exports and local consumptions in *** study attempted to evaluate land suitability for oilseeds crops using Geographic Information Systems(GIS)and multi-criteria evaluation in Diga district of East Wollega zone,western *** support the growing population,sesame and groundnut land suitability evaluations were carried out to ensure the sustainability of agricultural *** data inputs were used,including mainly climate data(temperature and rainfall),topography data(slope),soil data(soil texture,soil depth and soil drainage),and infrastructure data(road and market).In this study,sesame and groundnut land suitability areas were categorized into 4 classes:highly suitable,moderately suitable,marginally suitable,and not *** result revealed that,about 252.1 ha(0.4%)and 113.1 ha(0.2%)were highly suitable for sesame and groundnut *** showed that most parts of the study area were moderately suitable for sesame and groundnut ***,the central and western parts of the study area were highly suitable and moderately suitable for sesame *** study recommended the local communities to utilize the existing potential of the study area for sesame and groundnut ***,decision makers should promote the suitability of the area for both small-and large-scale investment on sesame and groundnut production.

关键词： Sesame Groundnut Land suitability Multi-criteria evaluation Diga district

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