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Woody species composition,structure and environmental determinants in a moist evergreen Afromontane forest,southern Ethiopia

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Journal of Forestry Research 2020年第4期31卷 1173-1186页

作者： befkadu mewded Mesele Negash Tesfaye Awas Forest and Range Land Plants Diversity Directorate Ethiopian Biodiversity InstituteP.O.Box:30726Addis AbabaEthiopia Wondo Genet College of Forestry and Natural Resources Hawassa UniversityP.O.Box:123ShashemeneEthiopia

Ethiopian moist evergreen Afromontane forests are vital for the conservation of plant diversity,including genetic pools of Coffea arabica ***,these forests are continuously shrinking and need empirical scientific studies for their effective conservation and sustainable *** study was,therefore,conducted to assess woody species composition,diversity,endemicity,structure,plant communities,and environmental determinants in Sirso moist evergreen Afromontane forest of southern *** variables such as altitude,slope,aspect,disturbance levels,and geographical location were recorded for each main *** structure and importance value index(IVI),diversity,vegetation classification,and correlation with environmental factors were analyzed.A total of 74 woody species representing 70 genera and 34 families were *** species were *** glutinosa *** *** and Prunus africana(Hook.f.)*** species categorized as vulnerable according to the IUCN red list *** highest number of species was recorded for the Rubiaceae family(8),followed by Euphorbiaceae(6),and Asteraceae(6).Five plant communities were identified:Maesa lanceolata-Dombeya torrida,Galiniera saxifraga-Cyathea manniana,Vepris dainellii-Triumfetta tomentosa,Dracaena fragrans-Rytigynia neglecta,and Arundinaria *** distribution of these communities depends on altitude,slope,and disturbance *** guineense(Wild.)DC.,Schefflera abyssinica(*** ***.)Harms,and Galiniera saxifraga(Hochst.)Bridson were species with the highest IVI,while ***,Cordia africana Lam.,Hagenia abyssinica(Bruce)***,Bridelia micrantha(Hochst.)Baill.,and *** had the *** structure of woody species showed an inverted J-shape,a J-shape,a bell-shape,and an irregular shaped *** latter three population structure revealed signs of disturbances,and were negatively correlated with altitude and *** study sh

关键词： Endemicity Plant community Population recruitment Regeneration status

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Germination pretreatment and storage behavior of Terminalia laxiflora seed

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Journal of Forestry Research 2019年第4期30卷 1337-1342页

作者： befkadu mewded Debissa Lemessa Hailu Negussie Abiyot Berhanu Forest and Rangeland Biodiversity Directorate Ethiopian Biodiversity Institute

Terminalia laxiflora Engl.&*** an important indigenous and multi-purpose species in *** threatened due to low germination and its storage behavior is *** this study,we aimed to(1)test pretreatments for breaking the dormancy of *** seed and(2)determine its storage *** were subjected to four pretreatments such as soaking,scarification,high-temperature,and *** were done before storage and after 2 years of dry storage at cold temperature(-10℃)based on randomized design with four *** first round of experimental results showed that *** seeds with high temperature treatments at 78℃for 10 min showed significantly higher germination percentage(80%).In the second round experiment,high-temperature treatment at 78℃for15 min,cold water soaking,high-temperature treatment at78℃for 10 min,hot water soaking,and high-temperature treatment at 78℃for 5 min showed significantly higher germination percentage from the remaining treatments(75,64,58,56,and 53%,respectively).To break the dormancy of *** seed and attain good germination result,seeds should be pretreated with high-temperature at 78℃for 10 min to test the initial germination before storage and should be pretreated with high-temperature(at 78℃for15,10,or 5 min),soaked in cold,or hot water for 24 h to monitor the germination after *** two experiments show that *** produces orthodox seed.

关键词： Dormancy breaking Dry storage High-temperature Soaking Storage behavior

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Surfactant-Enhanced Soil Washing for Removal of Petroleum Hydrocarbons from Contaminated Soils: A Review

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Pedosphere 2018年第3期28卷 383-410页

作者： Abayneh Ayele befkadu CHEN Quanyuan College of Environmental Science and Engineering Donghua University

An increase in energy demand leads to further exploration, transportation, and utilization of petroleum, which creates severe soil contamination because of recurrent accidents and oil spills. Remediation of these contaminated soils is challenging. Among many treatment methods practiced for remediation of petroleum-contaminated soils, surfactant-enhanced soil washing has been widely practiced as a preferred treatment option, as it is a fast and environmentally accepted method. In this paper, we review research undertaken on various anionic, nonionic, cationic, biological, and mixed surfactants for the remediation of petroleum hydrocarbon-contaminated soils. Upcoming surfactants like gemini and switchable surfactants are summarized. We assess the challenges and opportunities of in-situ and ex-situ soil washing, the mechanisms of surfactant-enhanced soil washing, and the criteria to follow for surfactant ***, we briefly discuss the operational and environmental factors affecting soil washing efficiency and soil and surfactant properties affecting surfactant adsorption. We also describe the advantages of coupling soil washing with effluent treatment and surfactant reuse challenges and opportunities. Moreover, challenges and possible new directions for future research on surfactant-enhanced soil washing are proposed.

关键词： adsorption biosurfactant effluent treatment gemini surfactant oil spills organic contaminants remediation soil pollution

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