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Growth and yield of two grain crops on sites former covered with eucalypt plantations in Koga Watershed, northwestern Ethiopia

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Journal of Forestry Research 2014年第4期25卷 935-940页

作者： Desalegn Tadele demel Teketay Bahir Dar University P. O. Box 1817 Bahir Dar Ethiopia Botswana College of Agriculture Department of Crop Sciences and Production Private Bag 0027 Gaborone Botswana

Farmers in the highlands of Ethiopia often plant Eucalyptus on their farmlands. However, growing Eucalyptus, especially on farm- lands suitable for crop production has become a great concern due to its alleged long-term site effects. Our study was conducted at Koga water- shed, Mecha District, northwestern Ethiopia to investigate whether crop- lands afforested with Eucalyptus camaldulensis Dehnh. can be restored for annual crop production after tree harvest. We compared growth and yield of two agricultural crops, barley （Hordeum vulgate L.） and finger millet （Eleusine coracana （L.） Gaertn.）, grown in clear-felled stands of E. camaldulensis and continuously cultivated croplands at twelve paired farmlands under a conventional farming system. Plant height and dry matter production were evaluated as indices of crop growth, while grain weight was evaluated as an index of crop yield. Crop growth and yield measurements averaged over all farmlands differed between land-use types. For both crops, plants grown on clear-felled stands were taller than on croplands. Dry matter production and yield were also significantly greater in crops cultivated on clear-felled stands. Cropland aboveground and belowground dry matter productions were lower by 31.8 and 25.4% for barley and 32.8% and 37% for finger millet, respectively. Clear-felled stands gave an average yield of 2.91 ***-1 for barley and 3.27 ***-1 for finger millet while cropland gave a yield of 1.97 and 2.31 ***-1 for barley and finger millet, respectively. Farmers also responded that farm plots on former eucalypt plantations showed greater crop growth and yield thandid continuously cultivated croplands. Farmers perceived that Eucalyptus plantations improved soil fertility and they preferred clear-felled stands for crop production and wished to plant Eucalyptus on their farmlands. Our results suggest that conversion of agricultural lands to Eucalyptus plantations can increase post-felling yields of cereal crops.

关键词： barley finger millet land-use change reclamation

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

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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

Non-timber forest products and household incomes in Bonga forest area,southwestern Ethiopia

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Journal of Forestry Research 2014年第1期25卷 215-223页

作者： Ermias Melaku Zeleke Ewnetu demel Teketay Bonga Agricultural Research Center Addis Ababa Science and Technology University Botswana College of Agriculture Department of Crop Science and Production

We identified the major non-timber forest products （NTFPs）, their contributions to household incomes, and the determinants influenc-ing engagement of households in using NTFPs in the Bonga forest area of Gimbo and Decha Districts of Kaffa Zone, southwest Ethiopia. Six Kebeles （the lowest administrative unit in Ethiopia） were sampled from two Districts and 150 households were randomly sampled using propor-tional-to-size techniques based on the number of farm households in each Kebele. Secondary data were collected from and focus group discussions were conducted with selected individuals. The farmers diversified liveli-hood activities such as crop and livestock production, collection of NTFPs and off-farm activities. NTFPs played a significant role in household incomes. The contribution from the major NTFPs （forest coffee, honey and spices） accounted for 47% of annual household in-come. The role of NTFPs was influenced by a number of factors. Vari-ables including being native to the area （＋）, total land holding （＋）, pos-session of livestock （＋） and access to extension （＋） significantly affected forest coffee production. Age of household head （-）, land holding （＋） and distance of the market from the residence （-） significantly affected honey production. Size of landholding （＋）, distance to market （-） and distance of the forest from the residence （-） were significant variables determining the NTFP incomes derived by the households. Attention is needed in the design of policies and strategies for the well-being of households to the contribution of NTFPs to local incomes and the variables that affect the collection of NTFPs must be considered.

关键词： Bonga forest determinants of NTFP collection household income livelihood activities NTFPs

Seed production,seed dispersal and seedling establishment of two afromontane tree species in and around a church forest：implications for forest restoration

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Forest Ecosystems 2016年第4期3卷 287-296页

作者： Abrham Abiyu demel Teketay Gerhard Glatzel Georg Gratzer Amhara Agricultural Research Institute P. O. Box 527 Bahir Dar Ethiopia Department of Crop Science and Production Botswana University of Agriculture and Natural Resources Private Bag 0027 Gaborone Botswana Institute of Forest Ecology University of Natural Resources and Life Sciences Peter Jordan Strage 82 A-1190 Vienna Austria

Background：Seed production,seed dispersal and seedling establishment are relevant life phases of *** these processes and their patterns is essential to recognize vegetation dynamics and to apply it to forest ***：For Olea europaea and Schefflera abyssinica,fecundity was estimated using randomized branch *** dispersal and seedling establishment were monitored using spatially explicit seed traps and *** functions were calibrated applying inverse ***：*** produced more seeds and had longer dispersal distances compared to *** between observed and predicted number of recruits were statistically *** of the two species showed different niche ***：The studied species were recruitment-limited due to low dispersal activity or lack of suitable *** relying on natural regeneration should overcome these limitations by increasing disperser visitation and reducing biotic and abiotic stresses.

关键词： Fecundity Olea europaea Schefflera abyssinica Recruitment limitation Restoration

Erratum to: Diversity and regeneration status of woody species in Tara Gedam and Abebaye forests, northwestern Ethiopia

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Journal of Forestry Research 2013年第3期24卷 615-618页

作者： Haileab Zegeye demel Teketay Ensermu Kelbessa Department of Biology Debre Markos UniversityP.O. Box 269 Debre Markos Ethiopia University of Botswana Okavango Research InstituteShorobe RoadPrivate Bag 285 Maun Botswana The National Herbarium Addis Ababa UniversityP.O. Box 3434 Addis Ababa Ethiopia

The original version of this article unfortunately contained one mistake in the column (IVI) of Tables 2 and 3 due to wrong formula. The corrected Table 2 and Table 3 should be:

关键词： northwestern Ethiopia IVI Erratum to Diversity and regeneration status of woody species in Tara Gedam and Abebaye forests

Species composition, stand structure, and regeneration status of tree species in dry Afromontane forests of Awi Zone, northwestern Ethiopia

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Ecosystem Health and Sustainability 2019年第1期5卷 199-215,I0020页

作者： Getaneh Gebeyehu Teshome Soromessa Tesfaye Bekele demel Teketay Center for Environmental Science in Addis Ababa University Addis AbabaEthiopia Ethiopian Environment and Forestry Research Institute Addis AbabaEthiopia Department of Crop Science Botswana University of Agriculture and Natural ResourcesGaboroneBotswana

Species composition,structure,and regeneration status of trees were assessed in five dry Afromontane *** each of the forests,trees having≥5 cm diameter at breast height were identified and measured in 80 quadrats(20×20m^(2)).We compared tree species composition and similarities,stem densities,frequencies,basal area and importance value index of *** index was calculated to 13.3%in the least disturbed and 22.5%in highly disturbed forests.A total of 1,655 individuals representing 38 species and 28 families were *** tree densities varied from 364.1 to 664.1stem ha^(−1) with an average basal area of 20.7m^(2) ha^(−1).The analysis showed significant differences in basal areas of tree species between the least and highly disturbed *** densities ranged from 2000 to 8162.5 stem ha^(−1) and sapling densities ranged from 512.5 to 2562.5 stem ha^(−1).The anthropogenic disturbances revealed high degradation of population structure and regeneration statutes of the trees in the studied forest *** conclusion,the study provided empirical results on the dominance,population structure,importance value and regeneration status of tree species,which would be instrumental for the development of successful rehabilitation strategies for the studied forests.

关键词： Basal area disturbances importance value index regeneration specie composition similarity topographic factors

Diversity and regeneration status of woody species in Tara Gedam and Abebaye forests,northwestern Ethiopia

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Journal of Forestry Research 2011年第3期22卷 315-328页

作者： Haileab Zegeye demel Teketay Ensermu Kelbessa Department of Biology Debre Markos UniversityP.O.Box 269Debre MarkosEthiopia University of Botswana Okavango Research InstituteShorobe RoadPrivate Bag 285MaunBotswana The National Herbarium Addis Ababa UniversityP.O.Box 3434Addis AbabaEthiopia

A study was conducted in Tara Gedam and Abebaye forests l,northwestern Ethiopia to investigate the diversity,regeneration status,socio-economic importance and the factors causing destruction of the forests.A total of 30 plots,measuring 20 m ×20 m,were established along line transects laid across the *** Rural Appraisal （PRA） method was employed to generate the socio-economic *** data were collected by field observation,semi-structured interview with key informants and discussion with relevant stakeholders.A total of 143 woody species belonging to 114 genera and 57 families were recorded,and of all the species 44 （30.8%） were trees,57 （39.9%） trees/shrubs,33 （23.1%） shrubs and 9 （6.3%） *** diversity and evenness of woody species in Tara Gedam forest are 2.98 and 0.65,respectively,and in Abebaye forest they are 1.31 and 0.31,*** total density and basal area of woody species in Tara Gedam forest are 3001 individuals ha-1 and 115.36 m 2 ha-1,respectively,and in Abebaye forest the values are 2850 individuals ha-1 and 49.45 m 2 ha-1,*** results on the importance value index （IVI） and DBH class distributions suggest that the species with low IVI value and poor regeneration status need to be prioritized for *** the socio-economic survey,the responses from the key informants indicatedthat the forests are the major sources of fuelwood （90%）,construction material （80%）,timber （75%） and farm implements （55%）.The forests are also sources of medicines,animal fodder,bee forage and edible *** Gedam monastery,assisted by the local people who have strong religious belief and high respect to the monastery,has played a great role in the maintenance of the sacred forest since a long *** present,the conservation efforts are made jointly by the monastery and institutions concerned with *** major factors that cause destruction of the forests are livestock grazing,tree cutting for various purpos

关键词： conservation density dominance frequency IVI socio-economic importance

Enhancement of diversity,stand structure and regeneration of woody species through area exclosure:the case of a mopane woodland in northern Botswana

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Ecological Processes 2018年第1期7卷 41-55页

作者： demel Teketay Keotshephile Kashe Joseph Madome Monica Kabelo John Neelo Mmusi Mmusi Wellington Masamba Department of Crop Science and Production Botswana University of Agriculture and Natural ResourcesPrivate Bag 0027GaboroneBotswana University of Botswana Okavango Research InstitutePrivate Bag 285MaunBotswana

Introduction:An area exclosure is the practice of land management that involves the exclusion of livestock and humans from openly accessing an area that is characterized by severe *** exclosures have been employed as cheap and convenient means of rehabilitating degraded forests/woodlands.A study was carried out to(i)assess the species richness,diversity and evenness;(ii)determine the densities,frequencies,dominance and importance value index;and(iii)assess the population structure and regeneration status of woody species inside and outside the fence(area exclosure)of Okavango Research Institute(ORI)located in Maun,northern ***:Thirty-five woody species were recorded inside(32 spp.)and outside(24 spp.)the ORI compound,and the population structure and regeneration status of the woody species were better inside than outside the ORI *** exclosure had seven times higher mean density of woody species than outside ORI,and an exceptional regeneration of seedlings was observed inside than outside the ORI compound,suggesting the process of recovery of the degraded *** frequencies of more than half of the woody species also showed increment inside than outside the *** results suggest that the exclosed area is still in an initial recovery stage since it had been an open grazing area prior to the establishment of the *** of the woody species encountered outside ORI showed hampered recruitment and regeneration,owing to different anthropogenic impacts and overgrazing by ***:Despite the relatively short period(10 years)of exclosure establishment,results from the present study have further provided empirical evidences on the actual crucial roles played by area exclosures to increase woody species richness,diversity,evenness,density,frequency,dominance and important value index as well as enhance the population structure and regeneration of the woody species in northern *** research is recomm

关键词： Frequency Density Important value index Maun Population structure Species richness

Longevity of Juniperus procera seed lots under different storage conditions: implications for ex situ conservation in seed banks

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Journal of Forestry Research 2011年第3期22卷 453-459页

作者： Negash Mamo Diriba Nigusie Mulualem Tigabu demel Teketay Miftah Fekadu Ethiopia Agricultural Research Organization Forestry Research Centre P.O.Box 30708 Addis Ababa Ethiopia Swedish University of Agricultural Sciences Southern Swedish Forest Research Centre Tropical Silviculture and Seed Laboratory PO Box 101 SE-230 53 Alnarp Sweden University of Botswana Okavango Research Institute Private Bag 285 Maun Botswana

Juniperus procera Endl. is economically important timber species, but its populations are extremely small and fragmented in its natural habitat, thus, calling for immediate ex situ conservation. Here we examined the effects of seed sources and storage temperature on the longevity of Juniperus procera seed lots through collection and preservation of seeds in seed banks. Seeds were collected from nine sites across the species natural distribution in Ethiopia and stored in four warehouses： modern cold room （5℃）, mud house （15℃）, concrete block house （17℃ or corrugated iron house （20℃） for 42 months. Every three months, a random sample of stored seeds were drawn and tested for germination. A highly significant variation （p 0.01） in germination of stored seeds was observed among different storage environments, seed lots, and duration of storage. Over the storage period, seeds stored in the cold room had the highest mean percentage germination, followed by the mud house, corrugated house and blocket house. The cold room （41%） and the mud house （38%） maintained the same level of germination as the intitial germination of the seedlotds （42%）. The variation in longevity of stored seeds was significnatly correlated with the initial germination of seed lots （r 0.80; p 0.01）. Cold storage also resulted in enhancement of germination through its stratification effect that terminated the non-deepphysiological dormancy of juniper seeds. In conclusion, seed lots with good initial germination can be effectively stored in cold room （5℃） up to four years. In the absence of modern cold stores, mud houses can be used as a good alternative to store seeds at local level.

关键词： germination African pencil cedar Ethiopia seed zones seed storage