检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

Genecological zones and selection criteria for natural forest populations for conservation:the case of Boswellia papyrifera in Ethiopia

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2018年第2期29卷 507-516页

作者： abayneh Derero Adefires Worku Habtemariam Kassa Ethiopian Environment and Forest Research Institute P.O.Box 30708Addis AbabaEthiopia Center for International Forestry Research Ethiopia OfficeP.O.Box 5689ILRI-Addis CampusAddis AbabaEthiopia

Rapid changes in land-use in the Combretum–Terminalia woodlands of northwestern Ethiopia are mainly due to the increases in commercial farming and *** used integrated ecological and social data collection techniques,including subdivision of the vegetation zone,vegetation survey,focus group discussions and key informant interviews,to identify genecological zones and set criteria for selection of viable populations of Boswellia papyrifera(Del.)Hochst in Ethiopia for *** of senior experts were supported with a rating method and involved 43 respondents and focused on identifying and weighting criteria and indicators of selection in a participatory way to prioritize populations for *** mean annual rainfall data,we reclassified the Combretum–Terminalia woodland vegetation region into three moisture zones(wet,moist and dry),and designated them as genecological zones for *** conservation.A total of 35 woody species were identified at Lemlem Terara site in Metema district,and the Shannon diversity index and evenness were 2.01 and of 0.62,*** were 405 adult trees,and 10 saplings and3314 seedlings per *** trees were medium-sized with overall mean diameter at breast height(dbh) of 16.9(±9.5)*** recruitment was poor due to grazing,crop production and fire *** a multi-criteria decision analysis,five criteria and 20 quantitative indicators were identified and weighted to prioritize populations for *** criteria in their descending order of importance are(1) forest ecosystem health and vitality,(2)forest cover and population structure of ***,(3)productive function of the forest,(4) biological diversity in the forest,and(5) socioeconomic benefits of the forest to *** tests in the general linear model revealed significant differences among researchers and nonresearchers in rating the criteria and indicators,but not among foresters and nonforester

关键词： Agricultural expansion Combretum–Terminalia Indicators Multi-criteria decision analysis method(MCDA) Settlement

Variation in seed traits and seedling vigour of Cordia africana *** in Ethiopia

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2017年第5期28卷 925-934页

作者： abayneh Derero Genene Tesfaye Zewdie Woldemariam Ethiopian Environment and Forest Research Institute

Cordia africana is a very important indigenous tree species for timber and other products and services in Ethiopia. Seed traits and seedling vigour of seeds from 12 provenances of the species were compared. Mean seed mass for each provenance was assessed for 1000 seeds in 10 replications, and seed length and width were measured for 100 seeds in four replications per provenance. Germination was assessed in a glasshouse taking 400 seeds from each provenance. Root collar diameter and height of 440 seedlings grown in a nursery for 290 days in Addis Ababa were measured. Seed length, seed width, seed mass, and shoot height and root collar diameter of seedlings showed significant differences (P < 0.001) among provenances. Correlation analysis between seed and seedling traits and environmental variables revealed significant positive correlations between seed width and germination percentage, seed width and altitude, seed width and longitude and seed length and latitude. Negative correlations were obtained between seed width and temperature, seed width and rainfall, seed mass and temperature, and germination and temperature of the seed source. As expected, differences in seed trait did not explain the variability in seedling vigour. Determining quantitative variations in seed traits and seedling vigour among provenances and the patterns along environmental gradients are essential for informing decisions on the tree improvement programme of the species.

关键词： Clinal Correlation Environmental gradient Improvement Quantitative

Germination pretreatment and storage behavior of Terminalia laxiflora seed

在线全文

学校读者我要写书评

暂无评论

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

Perceptions and attitudes of local people towards participatory forest management in Tarmaber District of North Shewa Administrative Zone, Ethiopia: the case of Wof-Washa Forests

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2017年第1期6卷 168-183页

作者： Solomon ayele Tadesse Demel Teketay Department of Natural Resources Management College of Agriculture and Natural Resource SciencesDebre Berhan UniversityP.O.Box 445Debre BerhanEthiopia Department of Crop Science and Production Botswana University of Agriculture and Natural ResourcesPrivate Bag 0027GaboroneBotswana

Introduction:Since the last few decades,the government of Ethiopia has introduced and adopted participatory forest management(PFM)in different regions of the ***,there is a lack of research dealing with perceptions and attitudes of local people towards PFM in Wof-Washa Forests(WWF).The aim of this study was to evaluate the perceptions and attitudes of local people towards PFM implemented in *** hypothesized that the perceptions and attitudes of local people towards PFM differ with socio-economic variables,such as sex,age,level of education,family size,occupation type,annual income,length of duration of local residence,livestock,and land ***:A structured questionnaire comprised of close-and open-ended questions was developed and administered to a total of n=64 households to collect information on the perceptions and attitudes of local people towards PFM in *** statistics and multiple linear regressions were used to analyze and interpret the ***:The results revealed that socio-economic variables had significant effects on the perceptions towards“the prevalence of the problems with the existing PFM system”(39%variance explained),“the concept of PFM”(30%variance explained),and“the presence of PFM practice”(11%variance explained).Majority of the respondents accepted the PFM program introduced in WWF in order to protect and manage the *** study also revealed that socio-economic variables had significant effects on the attitudes towards“managing forests via participatory approach”(16%variance explained),“having the responsibility to protect the WWF”(40%variance explained),and“accepting the PFM practice”(54%variance explained).However,the findings suggested that there were some respondents who were yet unsure to fully accept the concept and practice of ***:Creating public awareness about PFM is crucial to alleviate the problems of deforestation and reduce the unsustainable use of the *** socio-economic var

关键词： Deforestation Respondents Socio-economic variables Structured questionnaire Wof-Washa Forests

Woody plant diversity,structure and regeneration in the Ambo State Forest,South Gondar Zone,Northwest Ethiopia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2017年第1期28卷 133-144页

作者： Solomon Melaku Melese Belayneh ayele Department of Forestry College of AgricultureWolloUniversityP.O.Box 1145DessieEthiopia Department of Natural Resources Management Bahir DarUniversityP.O.Box 1551Bahir DarEthiopia

For this study in the Ambo State Forest on woody plant diversity, structure and regeneration, 70 quadrats, each 25 m by 25 m, were selected using a systematic random sampling technique and intervals of 100 m along a transect line. For assessing seedlings and saplings, two 2 × 10 m sub quadrats were set upon opposite sides of each main quadrat. Data on species diversity, abundance, structure, basal area, density, frequency and regeneration status were collected and analyzed using standard procedures and programs. Of 58 woody plant species identified, 69 % were trees, 16 % were shrubs, 12 % were tree/shrubs and 4 % were climbers. Fabaceae was the most speciesrich family comprising 17 species. The Shannon-Weiner diversity index was 2.73, and evenness was 0.67. The population structure in the cumulative diameter class frequency distribution revealed an interrupted and inverted J-shape with a very high decrease in higher diameter class. Acacia lahai （49 %） was the most important woody species with the highest importance value index. To maintain balanced structure, enhanced regeneration and protecting the forest from selective cutting are recommended.

关键词： Ambo Forest Diversity Structure -Importance value index Regeneration status

Local people’s knowledge on the adverse impacts and their attitudes towards growing Eucalyptus woodlot in Gudo Beret Kebele, Basona Worena district, Ethiopia

在线全文

学校读者我要写书评

暂无评论

Ecological Processes 2017年第1期6卷 381-393页

作者： Solomon ayele Tadesse Solomon Mulu Tafere Department of Natural Resources Management College of Agriculture and Natural Resource SciencesDebre Berhan UniversityP.O.Box 445Debre BerhanEthiopia Department of Forestry College of AgricultureWollo UniversityP.O.Box 1145DessieEthiopia

Introduction:Growing Eucalyptus at a farm level in the form of woodlot has become popular among rural households in *** example,rural households mainly establish Eucalyptus woodlot as a component of livelihood improvement and diversification to meet household wood demand and generating cash ***,there is lack of information on the growth parmeters of Eucalyptus woodlot and the factors influencing the household decision on their establishment at the individual farmland *** objective of this study was to examine local people’s knowledge on the adverse impacts and their attitudes towards growing Eucalyptus woodlot in Gudo Beret *** hypothesized that local people’s knowledge on the adverse impacts and their attitudes towards growing Eucalyptus woodlot in Gudo Beret Kebele is affected by socioeconomic and cognitive ***:A structured questionnaire comprising closed-and open-ended questions was developed and administered to a total of n=94 households to collect information on local people’s knowledge on the adverse impacts and their attitudes towards growing Eucalyptus *** households were randomly selected through a lottery system based on their house identification *** statistics,binary logit,and multiple linear regression were used to analyze and interpret the ***:The results revealed that about 92%of the respondents noted that growing Eucalyptus woodlot had positive impacts on the socioeconomic situation of the community considering that it contributes to economic benefits through the sale of wood products,such as poles,construction materials,and ***,only 8%of the respondents noted that the negative impacts of Eucalyptus woodlot were attributed to the decline in crop and forage production due to its allelopatic effect,and the reduction in ground water *** of the respondents(about 68%)preferred to grow Eucalyptus woodlot in Gudo Beret ***,most of the respon

关键词： Adverse impacts Binary logit regression Cognitive variables Eucalyptus Fuelwood Local communities Multiple linear regression Rural households Socioeconomic variables Woodlot

Views and attitudes of local people towards community versus state forest governance in Tehulederi District, South Wollo, Ethiopia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2019年第1期8卷 29-48页

作者： Birhan Ali Woldie Solomon ayele Tadesse Sustainable Natural Resources Management Association(SUNARMA) P.O.Box 11Debre BerhanEthiopia Department of Natural Resources Management College of Agriculture and Natural Resource SciencesDebre Berhan UniversityP.O.Box 445Debre BerhanEthiopia

Introduction:Restoring the degraded sites with vegetation cover is an optimal solution to mitigate environmental *** from the 1980s,donor-assisted land rehabilitation activities were taking place in Tehulederi District,South Wollo,***,majority of the forests were destroyed;part of the problem was associated with the top-down approach of forest *** challenge is,therefore,to find a system of management that can enhance the combined effect of both the community and the *** community forestry(i.e.a forest development activity which is practiced and managed collectively by the community members on their communal land)is one such *** objectives of the study were to(1)examine the views and attitudes of local people towards community versus state forests governance and(2)evaluate the management practices implemented in the community versus state forestry and their implications on the forest status and the livelihood of local ***:A structured questionnaire consisting of closed-and open-ended questions was developed to collect quantitative data from randomly selected ***,key informant interviews and focus group discussions were conducted to gather qualitative *** statistics and multiple linear regression were used to analyze and interpret the quantitative *** data obtained through key informant interviews and focus group discussions were synthesized and narrated using a qualitative ***:Several socioeconomic variables significantly affected the views and attitudes of local people towards community versus state forests ***,local people had positive views and attitudes towards the community *** 83%of the respondents agreed to accept and practice community *** contrast,about 70%of the respondents had negative views and attitudes towards the state *** positive views and attitudes of local people towards the community forestr

关键词： Environmental disaster Focus group discussion Forest utilization and management Household survey Key informant interview Sustainable forestry

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 p<*** spatial 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

同方期刊数据库