Professor
Aspects of silvicultural research in the changing world include socio-economic and cultural issues, silvicultural manage-ment for multiple-uses, silvicultural techniques for rehabilitation of degraded forests and landscapes, agroforestry strategies and
technologies, recycling of waste products through forest fertilization, silvicultural management to control pests, and management of valuable or rare, endangered and threatened forest species. In light of these silvicultural research directions,
our group has been and is still working in many countries such as Sweden, Nicaragua, Indonesia, Nepal, Laos, India, Iran, Burkina Faso and Ethiopia. The main focus of our research has been on development of tech-niquesfor seed quality assessment (e.g. biochemical markers and near infrared spectroscopy), effects of silvicultural management on structure and function of ecosystems, productivity of
non-timber forest products, stand dynamics and regeneration of tropical forest, monitoring biodiversity in protected areas, rehabilitation of degraded landscapes, charac-terization of storage behavior for effective ex situ conservation of forest genetic
resources, and evaluation of prove-nances for future tree improvement programs. We are also expanding the geographic locations of our research activities given our competence in the area of forest regeneration, rehabilitation of degraded
landscapes and searching for alter-natives for ex situ conservation of threatened species.
Our research vision is to develop silvicultural practices that can be applied to
develop new management approaches needed to balance economic, environmental and social criteria for sustainable forest management.

Teaching:
Research Group: Tropical Silviculture and Seed Science Subjects: Forest Management and Biology
Responsible for current or previous educational activities on under-graduate and post-graduate levels
Organic chemistry and biochemistry, 7.5 credits, level A, forest science programme
Seed biology, 7.5 credits level B, forest science programme
Seed technology, 7.5 credits, level B, forest science programme
Forest reproducion, 7.5 credits, level C, forest science programme
Tropical forest reproduction, 7.5 credits, level C, forest science programme
Advanced silviculture, 7.5 credits, level C, forest science programme
Silviculture in developing countries, 7.5 credits, level C, forest science programme
MSc-theses, 30 credits, D-level, SLU forest science programme.
Supervisor for Minor Field Studies in developing countries, forest science programme
Control of shoot growth in trees, 1.5 credit, PhD-level
Methods in scientific research, 1.5 credit, PhD-level
Introduction to research education, 1.5 credit, PhD-level
Statistical analyses by SAS, 3 credits, PhD-level
Scientific methods, 3 credits, PhD-level
Scientific publication, 3 credits, PhD-level
Forest reproduction and seed handling, 3 credits, PhD-level
Scientific writing, 3 credits, PhD-level
Forest restoration, 6 credits, PhD-level

MSc theses
1. Liv G Johansen, 1983. Abscisic acid and shoot growth cessation in Salix pentandra. MSc-thesis, Tromsö university, Norway.
2. Per-Olov Brandtberg, 1989. Allelopathic substances in Empetrum hermaphroditum. (In swedish). MSc-thesis, SLU, Forestry, Umeå.
3. Martin Sigurd, 1993. Physiological effects of allelopathic substances from Empetrum hermaphroditum on Pinus sylvestris (In swedish). MSc-thesis, SLU, Forestry, Umeå.
4. Carina Holm, 1995. Fumarase, an enzymatic marker during invigoration of Scots pine, lodgepole pine, and Norway spruce seeds (In swedish). MSc-thesis, SLU, Forestry, Umeå.
5. Alice Kempe, 1995. Beechnuts (Fagus sylvatica L.): Breaking dormancy to get a fast and even germination. MSc-thesis, SLU, Forestry, Umeå.
6. Pierre du Vivier, 1998. The fumaric enzyme: a quick way to determine the germination quality? Experimentation on Pinus sylvestrus seeds. MSc-thesis,SLU,  Forestry, Umeå.
7.Leulseged Demelash, 2001. Enhancing seed quality of two multipurpose tropical tree species: Pinus patula Schiede & Deppe and Schinus molle L. MSc-thesis Reports No 52, Swedish University of
Agricultural Sciences, Department of Silviculture, Umeå.
8. Maria Schelin. 2002. Reproductive strategy of two valuable woody species, Balanites aegyptiaca and Acacia macrostachya, from the savanna woodlands in Burkina Faso, West Africa. Graduate Thesis in Biology, No 2002-11. Swedish University of Agricultural Sciences, Department of Silviculture, Umeå.
9. Sandra Razanamandranto, 2003. Effects of herbivory, smoke, and fire on germination of tree seeds from the savanna woodlands in Burkina Faso. Graduate Thesis in Biology, No 2003-7. Swedish University of Agricultural Sciences, Department of Silviculture, Umeå.
10. Joakim Fjällström. 2004. Release of Physiological Dormancy and Detection of Insect-Damaged Seeds of Juniperus procera with Cold Stratification and Visible – NIR Spectroscopy. Graduate Thesis in Biology, No 2004-1. Swedish University of Agricultural Sciences, Department of Silviculture, Umeå.
11. Catherine Dembele. 2004. Forest Regeneration in Savanna-Woodland Subjected to Selective Cutting Disturbance in Burkina Faso, West Africa. Graduate Thesis in Forest Management, No 2004-11. Swedish University
of Agricultural Sciences, Department of Silviculture, Umeå.
12. Augusto Uasuf. 2004. Soil Seed Banks and Regeneration Patterns in Dry Deciduous and Gallery Forests in Nicaragua: Implications for Restoration. Graduate Thesis in Forest Management, No 2004-17. Swedish University of Agricultural Sciences, Department of Silviculture, Umeå.

PhD theses- Completed
1. Björn Sundberg, 1983-1987. Quantitative and metabolic studies of IAA in conifers. PhD. (Assistant supervisor).
2. Thomas Moritz, 1985-1990. The role of gibberellins in flower bud differentiation in conifers. PhD.
3. Wang Qing, 1990-1996. Gibberellins and the control of shoot growth in Scots pine (Pinus sylvestris L.) PhD.
4. Tongyun Shen. 2000. Biochemical aspects of forest tree seed viability and vigour. PhD-thesis, Silvestria 157.
5. Mulualem Tigabu. 2003. Characterization of Forest Tree Seed Quality with Near Infrared Spectroscopy and Multivariate Analysis. PhD-thesis, Silvestria 274.
6. Ali Soltani, 1999-2003. Improvement of seed germination of Fagus orientalis Lipsky. PhD-thesis, Silvestria 275.
7. Benigno Gonzales Rivas. 2005. Tree Species Diversity and Regeneration in Tropical Dry Forests in Nicaragua. Doctoral Thesis, Acta Universitatis agriculturae Sueciae vol.2005:58.
8. Guillermo Castro Marin. 2005. Stand Dynamics and Regeneration in Tropical Dry Forests in Nicaragua. Doctoral Thesis, Acta Universitatis agriculturae Sueciae vol.2005:59.
9. Niéyidouba Lamien. 2006. Analysis of Shea (Vitellaria paradoxa C.F.Gaertn.) fruits depletion factors and propositions for yield improvement and prediction at Bondoukuy, Western Burkina Faso. Dissertation defended at the University of Ouagadougou, Burkina Faso.
10. Patrice Savadogo. 2007. Dynamics of Sudanian Savanna-Woodland Ecosystem in Response to Disturbances. Doctoral Thesis, Acta Universitatis agriculturae Sueciae vol. 2007:64.
11. Didier Zida. 2007. Impact of Forest Management Regimes on Ligneous Regeneration in the Sudanian Savanna of Burkina Faso. Doctoral Thesis, Acta Universitatis agriculturae Sueciae vol. 2007:66.
12. Souleyman Paré. 2008. Land use Dynamics, Tree diversity and Local Perception of Dry forest Decline in Southern Burkina Faso, West Africa. Doctoral Thesis, Acta Universitatis agriculturae Sueciae vol. 2008:78.
13. Saran Traoré. 2008. Impact of epigeal termitaria on regeneration and dynamics of savanna ecosystems: a case study in Tiogo State Forest, Burkina Faso. Dissertation defended at the University of Ouagadougou, Burkina Faso.
14. Indra Prasad Sapkota. 2005-2009. Regeneration and diversity of Nepalese Sal forests in relation to disturbance.
15. Fidel Bougnounou, 2005-2009. Silvicultural aspects of forage plants in Southwest Burkina Faso. PhD student registered at University of Ouagadougou.

On-going PhD programs
16. Sovu Xengvue. 2005-2010. Forest Restoration on degraded lands in LAO PDR.
17. Catherine Dembele. 2006-2010. Propagation of commercial Sahelian trees.
18. Sidzabda Djibril Dayamba. 2006-2010. Fire and smoke effects on regeneration of woody and herbaceous species of the Sudanian savanna ecosystem.
19. Issa Ouedraogo. 2007-2011. Land use/land cover change in southern Burkina Faso and its impact on environmental sustainability
20. Pascaline Lingani. 2007-2011. Forest governance in Southern Burkina Faso.

Recent peer-reviewed publications
In press 2010
1. Issa Ouedraogo, Mulualem Tigabu, Patrice Savadogo, Halidou Compaoré, Per Christer Odén, Jean-Marie Ouadba. 2010. Land use change and its relation with population dynamics in Burkina Faso, West Africa. Land Degradation and Development (accepted)
2. Issa Ouedraogo, Patrice Savadogo, Mulualem Tigabu, Sidzabda Djibril Dayamba, Per Christer Odén. 2010. Systematic and Random Cover Transitions in the Tropical Dry forest of Burkina Faso, West Africa. International Journal of Remote Sensing (accepted)
3. Guillermo Castro-Marín, Mulualem Tigabu, Benigno González-Rivas, Per Christer Odén. 2010. Germination requirements and seedling establishment of four dry forest species from Nicaragua. Tropical Ecology (accepted).
4. Benigno González-Rivas, Mulualem Tigabu, Guillermo Castro-Marín, Per Christer Odén. 2010. Dynamics of Seedling and Sapling Populations and their Spatial Distributions of four Dry Forest Species in Nicaragua. Bois et Forêts des Tropiques (accepted)
5. Sidzabda Djibril Dayamba, Louis Sawadogo, Mulualem Tigabu, Patrice Savadogo, Didier Zida, Daniel Tiveau and Per Christer Oden. 2010. Smoke water dilution, heat and seed germination of herbaceous species of the Sudanian savanna-woodland of West Africa. Flora (in press)
6. Fidèle Bognounou, Mulualem Tigabu, Patrice Savadogo, Adjima Thiombiano, Issaka Joseph Boussim, Per Christer Oden, Sita Guinko. 2010. Regeneration of five Combretaceae species along a latitudinal gradient in Sahelo-Sudanian zone of Burkina Faso. Annals of Forest Science (in press)
7. Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén. 2010. Changes in tree diversity and dominance across a disturbance gradient in Nepalese Sal forests. Journal of Forestry Research (in press)
8. Souleyman Paré, Patrice Savadogo, Mulualem Tigabu, Per Christer Odén and Jean Marie Ouadba. 2010. Consumptive values and local perception of dry forest decline in West Africa.  Environment, Development, Sustainability (in press).
9. Souleyman Paré, Mulualem Tigabu, Patrice Savadogo, Per Christer Odén and Jean Marie Ouadba. 2010. Does designation of protected areas ensure conservation of tree diversity in the Sudanian dry forests of Burkina Faso? African Journal of Ecology (in press).

2009
1. Fidèle Bognounou, Patrice Savadogo, Adjima Thiombiano, Mulualem Tigabu, Issaka Joseph Boussim, Per Christer Oden, Sita Guinko. 2009. Impact of disturbance by roadwork on Pteleopsis suberosa regeneration along roadside environments in Burkina Faso, West Africa. Journal of Forestry Research 20(4), 355-361.
2. Benigno González-Rivas, Mulualem Tigabu, Guillermo Castro-Marín, Per Christer Odén. 2009. Soil seed bank assembly following secondary succession on abandoned agricultural fields in Nicaragua. Journal of Forestry Research, 20(4), 349-354.
3. Sovu Xengvue, Mulualem Tigabu, Patrice Savadogo, Per Christer Odén, Lamphoune Xayvongsa. 2009. Recovery of secondary forests on swidden cultivation fallows in Laos. Forest Ecology and Management 258(12), 2666-2675.
4. Pascaline Lingani, Mulualem Tigabu, Patrice Savadogo, Per-Christer Oden, Jean-Marie Ouadba. 2009. Household determinants and constraints of access to forest products in southern Burkina Faso, West Africa. Forest Policy and Economics, 11(7), 516-524.
5. Guillermo Castro Marín, Mulualem Tigabu, Benigno González-Rivas, Per Christer Odén. 2009. A chronosequence Analysis of Forest Recovery on Abandoned Agricultural Fields in Nicaragua. Journal of Forestry Research, 20(3), 213-222.
6. Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén. 2009. Tree diversity and regeneration of community-managed Bhabar lowland and Hill Sal forests in central region of Nepal. Bois et Forêts des Tropiques 300 (2), 57-68.
7. Indra Prasad Sapkota, Mulualem Tigabu, Per Christer Odén. 2009. Spatial distribution, advanced regeneration and stand structure of Nepalese Sal (Shorea robusta) forests subject to disturbances of different intensities. Forest Ecology and Management, 257, 1966-1975.
8. Benigno González-Rivas, Mulualem Tigabu, Guillermo Castro-Marín, Per Christer Odén. 2009. Seed germination and seedling establishment of Neotropical dry forest species in response to temperature and light conditions. Journal of Forestry Research, 20(2), 99-104.
9. Souleyman Paré, Patrice Savadogo, Mulualem Tigabu, Per Christer Odén and Jean Marie Ouadba. 2009. Regeneration and spatial distribution of seedling populations in Sudanian dry forests in relation to conservation status and human pressure. Tropical Ecology, 50(2), 339-353.
10. Issa Ouedraogo, Patrice Savadogo, Mulualem Tigabu, Roy Cole, Per Christer Odén, Jean-Marie Ouadba. Is rural migration a threat to environmental sustainability in southern Burkina Faso? Land Degradation and Development, 20 (2), 217-230.
11. Patrice Savadogo, Mulualem Tigabu, Louis Sawadogo and Per Christer Odén.¬¬¬ 2009. Herbaceous phytomass and nutrient concentrations of four grass species in Sudanian savanna-woodland subjected to recurrent early fire. African Journal of Ecology, 47(4), 699-710.
12. Patrice Savadogo, Mulualem Tigabu, Louis Sawadogo and Per Christer Odén. 2009. Examination of multiple disturbances effects on herbaceous vegetation communities in the Sudanian savanna-woodland of West Africa. Flora 204(6).409-422.
13. Didier Zida, Mulualem Tigabu, Louis Sawadogo, Daniel Tiveau and Per Christer Odén. 2009. Long-term effects of prescribed early fire, grazing and selective tree cutting on seedling populations in the Sudanian savanna of Burkina Faso. African Journal of Ecology, 47(1), 97-108.
14. Augusto Uasuf, Mulualem Tigabu and Per Christer Odén. 2009. Soil Seed Banks and Regeneration of Neotropical Dry Deciduous and Gallery Forests in Nicaragua. Bois et Forêts des Tropiques, 299(1), 49-62.
15. Guillermo Castro Marín, Mulualem Tigabu, Benigno González, Per Christer Odén. 2009. Natural regeneration dynamics of three dry deciduous forest species in Chacocente Wildlife Reserve, Nicaragua. Journal of Forestry Research, 20(1), 1-6.
16. Indra Prasad Sapkota, Mulualem Tigabu and Per Christer Odén. 2009. Species diversity and regenerationof old-growth seasonally dry Shorea robusta forests following gap formation. Journal of Forestry Research, 20 (1), 7-14.
17. Indra Prasad Sapkota and Per Christer Odén. 2009. Gap characteristics and their effects on regeneration, dominance and early growth of woody species. Journal of Plant Ecology, 2 (1), 21-29.
18. Indra Prasad Sapkota, Mulualem Tigabu and Per Christer Odén. 2009. Tree diversity and regeneration of community-managed Bhabar lowland and Hill Sal forests in central region of Nepal. Bois et Forêts des Tropiques, 63(300), 57-68.

2008
1. Indra Prasad Sapkota and Per Christer Odén. 2008. Household characteristics and forest dependency on community forests in Terai of Nepal. International Journal of Social Forestry, 1 (2), 123-144.
2. Catherine Ky-Dembele, Mulualem Tigabu, Jules Bayala1, Sibiri Jean Ouédraogo and Per Christer Odén. 2008. Comparison between clonal and sexual plantlets of Detarium microcarpum Guill. & Perr., a savanna tree species in Burkina Faso. African Journal of Ecology, 46 (4), 602-611.
3. Sidzabda Djibril Dayamba, Mulualem Tigabu, Louis Sawadogo and Per Christer Oden. 2008. Seed germination of herbaceous and woody species of the Sudanian savanna-woodland in response to heat shock and smoke. Forest Ecology and Management, 256(3), 462-470.  
4. Didier Zida, Mulualem Tigabu, Louis Sawadogo and Per Christer Oden. 2008. Initial seedling morphological characteristics and field performance of two Sudanian savanna species in relation to nursery production period and watering regimes. Forest Ecology and Management, 255(7), 2151-2162.
5. Saran Traoré, Mulualem Tigabu, Sibiri Jean Ouédraogo, Sita. Guinko, Joseph I., Boussim and Michel G. Lepage. 2008. Macrotermes mounds as sites for tree regeneration in a Sudanian woodland (Burkina Faso). Plant Ecology, 198(2), 285-295.
6. Patrice Savadogo, Daniel Tiveau, Louis Sawadogo and Mulualem Tigabu. 2008. Herbaceous species responses to long-term effects of prescribed fire, grazing and selective tree cutting in the savanna-woodlands of West Africa. Perspectives in Plant Ecology, Evolution and Systematics, 10(3), 179-195.
7. Niéyidouba Lamien, Mulualem Tigabu, Ramy Dabiré, Sita Guinko and Per Christer Odén. 2008. Insect (Salebria sp) infestation and impact on Vitellaria paradoxa C.F. Gaertn. fruit production in agroforestry parklands. Agroforestry Systems, 72(1), 15-22.

2007
1. V. Sivakumar, R. Anandalakshmi, R.R. Warrier, B.G. Singh, Mulualem Tigabu and P.C. Odén. 2007. Petroleum flotation technique upgrades the germinability of Casuarina equisetifolia seed lots. New Forests, 34(3), 281-294.
2. Patrice Savadogo, Didier Zida, Louis Sawadogo, Daniel Tiveau, Mulualem Tigabu and Per Christer Odén. 2007. Fuel and fire characteristics in savanna-woodland of West Africa in relation to grazing and dominant grass type. International Journal of Wildland Fire, 16(5), 531-539.
3. Niéyidouba Lamien, Mulualem Tigabu, Sita Guinko and Per Christer Odén. 2007. Variations in dendrometric and fruiting characters of Vitellaria paradoxa populations and multivariate models for estimation of fruit yield. Agroforestry Systems, 69(1), 1-11.
4. Mulualem Tigabu, Joakim Fjellström, Per Christer Odén and Demel Teketay. 2007. Germination of Juniperus procera seeds in response to stratification and smoke treatments, and detection of insect-damaged seeds with VIS+NIR spectroscopy. New Forests, 33(2), 155-169.
5. Ky-Dembélé, C., Mulualem Tigabu, Bayala, J., Ouédraogo, S.J. and Odén, P.C. 2007. The relative importance of different regeneration mechanisms in a selectively cut savanna- woodland in Burkina Faso, West Africa Forest Ecology and Management, 243(1), 28-38.
6. Didier Zida, Louis Sawadogo, Mulualem Tigabu, Daniel Tiveau and Per Christer Odén. 2007. Dynamics of sapling population in Sudanian woodlands subjected to grazing, early fire and selective cutting for a decade. Forest Ecology and Management, 243(1), 102-115.
7. Patrice Savadogo, Mulualem Tigabu, Louis Sawadogo and Per Christer Odén. 2007. Woody Species Composition, Structure and Diversity of Vegetation Patches of a Sudanian Savanna in Burkina Faso, West Africa. Bois et Forêts des Tropiques, 294 (4) 5-20.

2006
1. V. Sivakumar, R.R. Warrier, R. Anandalakshmi, Mulualem Tigabu, P.C Odén, S.N. Vijayachandran, S.Geetha and B.G. Singh. 2006. Germination requirements and storage behavior of Myristica dactyloides Gaertn. seeds. Seed Science & Technology, 34(3), 751-755.
2. Benigno González-Rivas, Mulualem Tigabu, Karin Gerhardt, Guillermo Castro-Marín and Per Christer Odén. 2006. Species Composition, Diversity and Local Uses of Tropical Dry Deciduous and Gallery Forests in Nicaragua. Biodiversity and Conservation, 15(4), 1509-1527.
3. V. Sivakumar, R. Anandalakshmi, R.R. Warrier, Mulualem Tigabu, P.C Odén, S.N. Vijayachandran, S.Geetha and B.G. Singh. 2006. Effects of presowing treatments, desiccation and storage conditions on germination of Strychnos nux-vomica seeds, a valuable medicinal plant. New Forests, 32(2), 121-131.
4. Niéyidouba Lamien, Mulualem Tigabu, Per Christer Odén and Sita Guinko. 2006. Effects of girdling on the reproduction of the shea tree (Vitellaria paradoxa C.F. Gaertn.) in Bondoukuy, Burkina Faso. Fruits, 61(5), 259-266.

2005
1. Mulualem Tigabu, Per Christer Odén and Dag Lindgren. 2005. Identification of seed sources and parents of Pinus sylvestris L. using visible–near infrared reflectance spectra and multivariate analysis. TREES, 19(4), 468-476.
2. Ali Soltani, Mulualem Tigabu and Per Christer Odén. 2005. Alleviation of Physiological Dormancy in Oriental Beechnuts with Cold Stratification at Controlled and Unrestricted Hydration. Seed Science & Technology, 33(2), 283-292.
3. Sandra Razanamandranto, Mulualem Tigabu, Louis Sawadogo, and Per Christer Odén. 2005. Seed germination of eight savanna-woodland species from West Africa in response to different cold smoke treatments. Seed Science & Technology., 33(2), 315-328.
4. Didier Zida, Mulualem Tigabu, Louis Sawadogo and Per Christer Oden. 2005. Germination requirements of seeds of four woody species from the Sudanian savanna in Burkina Faso, West Africa. Seed Science & Technology, 33(3), 581-593.
5. Castro G., Nygård, R., Gonzalez, B. and Oden, P.C. 2005. Stand dynamics and basal area change in a tropical dry forest reserve in Nicaragua. Forest Ecology and Management, 208, 63-75.

2004
1. Mulualem Tigabu and Per Christer Odén 2004a. Simultaneous detection of filled, empty and insect-infested seeds of three Larix species with single seed near infrared transmittance spectroscopy. New Forests, 27(3), 39-53.
2. Mulualem Tigabu and Per Christer Odén 2004b. Rapid and non-destructive analysis of vigor of Pinus patula seeds using single seed near infrared transmittance spectra and multivariate analysis. Seed Science & Technology, 32(2), 593-606.
3. Mulualem Tigabu, Per Christer Odén, and Tong Yun Shen. 2004. Application of near infrared spectroscopy for the detection of internal insect infestation in Picea abies seed lots. Canadian Journal of Forest Research, 34 (1), 76-84.
4. Leulseged Demelash, Mulualem Tigabu and Per Christer Odén.  2004. Evaluating the relative storability of IDS-treated and untreated Pinus patula Schiede & Deppe seeds by accelerated aging. Journal of Tropical Forest Science, 16 (2), 206-217.
5. Maria Schelin, Mulualem Tigabu, Ingalill Eriksson, Louis Sawadogo and Per Christer Odén. 2004. Predispersal seed predation in Acacia macrostachya, its impact on seed viability, and germination responses to scarification and dry heat treatments. New Forests, 27(2), 251-267.
6. Sandra Razanamandranto, Mulualem Tigabu, Samuel Neya, and Per Christer Odén. 2004. Effects of gut treatment on recovery and germinability of bovine and ovine ingested seeds of four woody species from the Sudanian savanna in West Africa. Flora, 199(5), 389-397.

2003
1. Mulualem Tigabu and Per Christer Odén 2003a. Discrimination of viable and empty seeds of Pinus patula Schiede & Deppe with near infrared spectroscopy. New Forests, 25(3), 163-176.
2. Mulualem Tigabu and Per Christer Odén 2003b. Near Infrared Spectroscopy-based method for separation of sound and insect-damaged Seeds of Albizia schimperiana, a Multipurpose Legume. Seed Science & Technology, 31(2), 317-328.
3. Maria Schelin, Mulualem Tigabu, Ingalill Eriksson, Louis Sawadogo and Per Christer Odén. 2003. Effects of scarification, gibberellic acid and dry heat treatments on the germination of Balanites aegyptiaca from Burkina Faso. Seed Science & Technology, 31(3), 605-617.
4. Leulseged Demelash, Mulualem Tigabu and Per Christer Odén.  2003. Enhancing germinability of Schinus molle L seed lot from Ethiopia with specific gravity and IDS techniques. New Forests, 26(1), 33-41.
5. Ali Soltani, Torbjörn Lestander, Mulualem Tigabu and Per Christer Odén 2003. Prediction of viability of oriental beechnuts, Fagus orientalis, using near infrared spectroscopy and partial least squares regression. Journal of Near Infrared spectroscopy, 11(5), 357-364. 

2002
1. Mulualem Tigabu and Per Christer Odén. 2002. Multivariate classification of sound and insect-infested seeds of a tropical multipurpose tree, Cordia africana, with near infrared reflectance spectroscopy. Journal of Near Infrared Spectroscopy, 10(1), 45-51.
2. Leulseged Demelash, Mulualem Tigabu and Per Christer Odén. 2002. Separation of empty and dead-filled seeds from a seed lot of Pinus Patula with IDS technique. Seed Science & Technology, 30(3), 677-681.
3. Lestander, T. & Odén P.C. 2002. Separation of viable and non-viable filled Scots pine (Pinus sylvestris L.) seeds by single seed near infrared transmittance spectroscopy. Seed Science and Technology 30: 383-392.
4. Shen, T.Y. & Odén, P.C. 2002. Relationships between seed vigour and fumarase activity in Picea abies, Pinus contorta, Betula pendula and Fagus sylvatica. Seed Science and Technology 30: 177-186.

2001-2000
1. Mulualem Tigabu and Per Christer Odén 2001. Effects of scarification, gibberellic acid and temperature on seed germination of two multipurpose Albizia species from Ethiopia. Seed Science & Technology, 29(1), 11-20.
2. Shen, T. Y. & Odén, P.C. 2000. Fumarase activity as a quick vigour test for Scots pine (Pinus sylvestris L.) seeds. Seed Science and Technology, 28: 825-835.

Conferences and Institutional reports
1. Mulualem Tigabu and Per Christer Odén. 2001. Characterization of tropical forest tree seeds using NIR spectroscopy: Insect infestation. NIR and Calibration in Academic and Industrial Use, 5th NIR NORD Midwinter meeting, 13-14 February 2001, Hällnäs, Sweden (Oral presentation).
2. Mulualem Tigabu and Per Christer Odén. 2002. Near Infrared Spectroscopy as a potential technique to upgrade seed lot quality of conifers. Proc. of IUFRO Research Group for Seed Physiology and Technology. Sep. 11-15, 2002, Chania, Crete, Greece, pp. 185-192 (Oral presentation).
3. Lestander, T., Geladi, P. & Odén P.C. 2002. 2- and 3-way analysis of near infrared scans from seed crossings. In Near Infrared Spectroscopy: Proceedings from the 10th International Conference, Davies, A.M.C. & Cho, R.K. (eds), pp 385-388. (Oral presentation)
4. Ky-Dembélé, C., Mulualem Tigabu, Bayala, J., Ouédraogo, S.J. and Odén, P.C. 2004. The relative importance of different regeneration modes for the restoration of selectively cut savanna- woodland in Burkina Faso. Symposium on the rehabilitation of dryland forests in Ethiopia: Ecology and Management, 21-24 September, 2004, Mekelle, Ethiopia. (Poster)
5. Indra Prasad Sapkota, Mulualem Tigabu and Per Christer Odén. 2006. Tree diversity and Regeneration of lowland Bhabar and Hill Sal forests in Central Region of Nepal. “Plant Dynamics: from Molecules to Ecosystems”, 3rd European Plant Science Organization Conference, 28 May – 1 June 2006, Hungary. (Poster)
6. Didier Zida, Patrice Savadogo, Daniel Tiveau, Djibril Dayamba, Louis Sawadogo, Mulualem Tigabu, Per Christer Odén. 2008. Disturbance in Sudanian Savanna Woodlands and Ecological Responses under Climate Change: The Contribution of Long-term Ecological Research on Fire, Grazing and Selective Cutting. Proc.
of IUFRO Forest Adaptation 2008. August 25-28, 2008, Umeå, sweden, p. 277. (Oral presentation)
7. Indra Prasad Sapkota, Mulualem Tigabu and Per Christer Odén. 2008. Changes in tree species diversity, species' spatial patterns and regeneration across a disturbance gradient in Dipterocarp forests. The 9th conference on Biodiversity in a Rapidly Changing World, THE NATIONAL COUNCIL FOR SCIENCE AND THE ENVIRONMENT, December 8-10, 2008, Washington, DC. (Poster)
8. Issa Ouedraogo , Mulualem Tigabu , Patrice Savadogo & Jean-Marie Ouadba. 2008. Impact of private company's management regimes on land-cover change in the state-owned protected areas in Burkina Faso. 7th AARSE International Conferenceon EARTH OBSERVATION AND GEOINFORMATION FOR GOVERNANCE IN AFRICA 27th
October - 30th October, 2008. Accra – Ghana. (Oral presentation)
9. Issa Ouedraogo, Patrice Savadogo, Mulualem Tigabu, Per Christer Odén, Jean-Marie Ouadba. 2009. Land-cover Change Trajectories in Southern Burkina Faso, West Africa. Association of American Geographers – 2009 Annual meeting, Las Vegas, NV. (Oral presentation)