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Projecting future precipitation change across the semi-arid Borana lowland,southern Ethiopia

Journal of Arid land 2023年第9期15卷 1023-1036页

作者： Mitiku A WORKU gudina l feyisa Kassahun T BEKETIE Emmanuel GARBOlINO Department of Environment and Climate Change Management Ethiopian Civil Service UniversityAddis Ababa 1000Ethiopia Center for Environmental Science Addis Ababa UniversityAddis Ababa 1000Ethiopia Climpact Data Science Nova-Sophia 06904France

Climate change caused by past,current,and future greenhouse gas emissions has become a major concern for scientists in the field in many countries and regions of the *** study modelled future precipitation change by downscaling a set of large-scale climate predictor variables(predictors)from the second generation Canadian Earth System Model(CanESM2)under two Representative Concentration Pathway(RCP)emission scenarios(RCP4.5 and RCP8.5)in the semi-arid Borana lowland,southern *** Statistical DownScaling Model(SDSM)4.2.9 was employed to downscale and project future precipitation change in the middle(2036-2065;2050s)and far(2066-2095;2080s)future at the local *** precipitation observations from eight meteorological stations stretching from 1981 to 1995 and 1996 to 2005 were used for the model calibration and validation,respectively,and the time period of 1981-2018 was considered and used as the baseline period to analyze future precipitation *** results revealed that the surface-specific humidity and the geopotential height at 500 hPa were the preferred large-scale *** to the middle future(2050s),precipitation showed a much greater increase in the far future(2080s)under both RCP4.5 and RCP8.5 scenarios at all meteorological stations(except Teletele and Dillo stations).At Teltele station,the projected annual precipitation will decrease by 26.53%(2050s)and 39.45%(2080s)under RCP4.5 scenario,and 34.99%(2050s)and 60.62%(2080s)under RCP8.5 ***,the main rainy period would shift from spring(March to May)to autumn(September to November)at Dehas,Dire,Moyale,and Teltele stations,but for Arero and Yabelo stations,spring would consistently receive more precipitation than *** can be concluded that future precipitation in the semi-arid Borana lowland is predicted to differ under the two climate scenarios(RCP4.5 and RCP8.5),showing an increasing trend at most meteorological *** information could be he

关键词： future precipitation climate change second generation Canadian Earth System Model(CanESM2) Statistical DownScaling Model(SDSM) semi-arid Borana lowland southern Ethiopia

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A global view of regulatory ecosystem services:existed knowledge,trends,and research gaps

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Ecological Processes 2020年第1期9卷 461-474页

作者： Wondimagegn Mengist Teshome Soromessa gudina legese feyisa Department of Natural Resource Management Debre Berhan UniversityDebre BerhanEthiopia Center for Environmental Science Addis Ababa UniversityAddis AbabaEthiopia

Ecosystem services(ES)are growing fields of *** helps to provide an inherent way to understand the synergy and trade-offs between human beings and their natural *** ecosystem services(RES)are significantly important to maintaining the world in which people can live,and control the negative effects of flood,disasters,and *** can also provide regulatory services like ecosystem protection,human safety,and the provision of other ***,emerging ES decision-making agendas focus on ES that is tangible and has a direct link with human ***,the attention given to RES is low due to its less tangible benefits and complexity to measure the *** and lack of attention from policymakers and scientific community may lead to unintended risks to human well-being and significant influences on the provision of other *** study describes the research trends on RES,knowledge generated,and the major *** concluded that though there is an exponential growth of scientific publications on ES,no adequate studies were found on ***,the existed studies varied in their size and types of RES indicators covered,habitats/ecosystems,and geographic extent *** was also a lack of connecting knowledge generated on the benefits of RES with the national policy of natural resource management,inconsistency of ES classification,and methodological ***,scientific communities are promoted to link RES studies with human ***,the researcher should give priority for the least studied ecosystems and its services,developing robust methodology,and proposing management options to enhance the regulatory services of ecosystems.

关键词： Ecosystem Ecosystem service indicators less tangible benefits Regulatory ecosystem services Research trend Undervalued services

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Modeling effects of abiotic factors on the abundances of eight woody species in the Harana forest using artificial networks,random forest,and generalized linear models

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Ecological Processes 2023年第1期12卷 151-164页

作者： Girma Ayele Bedane gudina legese feyisa Feyera Senbeta Wakjira Center for Environmental Science College of Computational and Natural ScienceAddis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia Centre for Environment and Development College of Development StudiesAddis Ababa UniversityAddis AbabaEthiopia

Background Abiotic factors exert different impacts on the abundance of individual tree species in the forest but little has been known about the impact of abiotic factors on the individual plant,particularly,in a tropical *** study identified the impact of abiotic factors on the abundances of Podocarpus falcatus,Croton macrostachyus,Celtis africana,Syzygium guineense,Olea capensis,Diospyros abyssinica,Feliucium decipenses,and Coffea arabica.A systematic sample design was used in the Harana forest,where 1122 plots were established to collect the abundance of *** forest(RF),artificial neural network(ANN),and generalized linear model(GlM)models were used to examine the impacts of topographic,climatic,and edaphic factors on the log abundances of woody *** RF model was used to predict the spatial distribution maps of the log abundances of each *** The RF model achieved a better prediction accuracy with R^(2)=71%and a mean squared error(MSE)of 0.28 for Feliucium *** RF model differentiated elevation,temperature,precipitation,clay,and potassium were the top variables that influenced the abundance of *** ANN model showed that elevation induced a nega-tive impact on the log abundances of all woody *** GlM model reaffirmed the negative impact of elevation on all woody species except the log abundances of Syzygium guineense and Olea *** ANN model indicated that soil organic matter(SOM)could positively affect the log abundances of all woody *** GlM showed a similar positive impact of SOM,except for a negative impact on the log abundance of Celtis africana at pl distributions of the log abundances of Coffee arabica,Filicium decipenses,and Celtis africana were confined to the eastern parts,while the log abundance of Olea capensis was limited to the western *** The impacts of abiotic factors on the abundance of woody species may vary with *** ecological underst

关键词： Species distribution model Random forest Artificial neural network Generalized linear model Species abundance Woody species Environmental variable

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Spatial distribution of above ground carbondensity in Harana Forest,Ethiopia

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Ecological Processes 2022年第1期11卷 14-26页

作者： Girma Ayele Bedane gudina legese feyisa Feyera Senbeta Center for Environmental Science College of Computational and Natural ScienceAddis Ababa UniversityP.O.Box No.1176Addis AbabaEthiopia Centre for Environment and Development College of Development StudiesAddis Ababa UniversityAddis AbabaEthiopia

Background:The need for understanding spatial distribution of forest aboveground carbon density(ACD)hasincreased to improve management practices of forest *** study examined spatial distribution of theACD in the Harana Forest.A grid sampling technique was employed and three nested circular plots were establishedat each point where grids ***-related data were collected from 1122 plots while the ACD of each plotwas estimated using the established allometric *** variables in raster format were downloadedfrom open sources and resampled into a spatial resolution of 30 *** statistics were computed to summarize the ACD.A Random Forest classification model in the R-software package was used to select strong predictors,and to predict the spatial distribution of ***:The mean ACD was estimated at 131.505 ton per ha in this study *** spatial prediction showed thatthe high class of the ACD was confined to eastern and southwest parts of the Harana *** Moran’s statisticsdepicted similar observations showing the higher clustering of ACD in the eastern and southern parts of the *** higher ACD clustering was linked with the higher species richness,species diversity,tree density,tree height,clay content,and ***,the lower ACD clustering in the Harana Forest was associated with higher soilcation exchange capacity,silt content,and ***:The spatial distribution of ACD in this study area was mainly influenced by attributes of the forest standand edaphic factors in comparison to topographic and climatic *** findings could provide basis for bettermanagement and conservation of aboveground carbon storage in the Harana Forest,which may contribute to Ethiopia’s strategy of reducing carbon emission.

关键词： Aboveground carbon density Spatial modeling Prediction Random Forest Cluster Pattern

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Effects of urbanization on the relationship between greenspace patterns and evolution of regional heat island in cities of Ethiopia

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Chinese Journal of Population,Resources and Environment 2021年第4期19卷 330-343页

作者： Mekonnen Amberber Degefu Mekuria Argaw gudina legese feyisa Sileshi Degefa Kotebe Metropolitan University Addis AbabaEthiopia Center for Environmental Science Addis Ababa UniversityAddis AbabaEthiopia

Green space(GS)is a central element of urban ecosystems while,urbanization is substantially changed green land into impervious ecosystems,which has then troubled the equilibrium of the surface thermal energy and the ecosystem services *** study was intended to explore the response of relative land surface temperature(RlST)intensities to the urban ecosystem-agglomeration dynamics as well as regional thermal environment(RTE)effects on green space in four major cities(i.e.,Addis Ababa-Hawassa-Adama-Bahir Dar)of Ethiopia from 1990−2020,using a set of remote sensing images,single-channel algorism,and geospatial *** results showed the trends of GS evolution were:GS loss>GS gain>GS ***,the distinct ecosystems as high-temperature zones(RlST more than 2°C)were gradually augmented and significantly intensified between 2010−2020 in all cities,while the proportion of green space was significantly *** to this,the segregated urban heat islands were gradually inter-weaved and interacted with each other and forming regional heat ***,the newly established green space has fewer cooling effects than urban forest and greenery,because RlST of green space loss and gain are substantially *** also confirmed that the regional thermal environment is not only prejudiced by ecosystem patterns and processes besides substantially conquered by the particular GS change processes as well as RHI dynamics and evolution rate.

关键词： Greenery land Regional thermal environment Agglomeration Resilience

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Status,approaches,and challenges of ecosystem services exploration in Ethiopia:A systematic review

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Chinese Journal of Population,Resources and Environment 2020年第3期18卷 201-213页

作者： Mekonnen Amberber Mekuria Argaw gudina legese feyisa Sileshi Degefa Department for Environmental Science College of Natural and Computational SciencesKotebe Metropolitan UniversityAddis AbabaEthiopia Center for Environmental Science Addis Ababa UniversityAddis AbabaEthiopia

Healthy ecosystems benefit humans in various forms,and ecosystem services(ESs)are the benefits reaped by people in various ***,increase in global human population and the resulting anthropogenic activities have led to rapid alterations in the composition,structure,and functions of the ecosystems as well as their degradation,increasing the losses associated with ES *** of people in several developing countries are highly dependent on their surrounding ecosystems and the services they ***,management and reduction of ecosystem modification are required;especially in developing countries,this requirement is even more *** Africa,ecosystem-based studies are limited and in still in their initial ***,this paper examines dynamic Ethiopian ESs in Africa from 2010 to 2019 based on a systematic bibliometric analysis of articles from the Scopus database using a set of standard *** total,73 articles were published on Africa,including *** results reveal that the spatial distribution trend of ES studies is unevenly distributed,where most studies were conducted in the central highlands,followed by southwestern regions,with no studies on the western part of *** service providing units(SPUs),the urban ecosystem and agroecosystem accounted for 25%and mixed ecosystems accounted for 20%.Furthermore,a total of 67 specific ESs were investigated by researchers,among which 81.25%of the specific ESs were classified into two ES *** ES(40.29%)dominated across all of the ES types while the cultural ES(5.97%)type has received little *** on keywords,ESs were strongly linked to South Africa,Ethiopia,and *** terms of the co-authorship network,authors from the United Kingdom,Italy,Burkina Faso,the Netherlands,and Germany actively collaborated with the Ethiopian researchers,and approximately 50%of the studies were aimed at estimating the value of the ESs through an applied

关键词： Bibliometric analysis Challenge Ethiopia Ecosystem services Scopus

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