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Yonika Mathew Ngaga


Professor Ngaga is currently the Deputy Vice Chancellor (Administration and Finance) at Sokoine University of Agriculture. He completed his PhD in 1998 at Agricultural University of Norway where he specialized in Forest Economics and Socio-Economics.

Over the past 30 years he has been engaged in the following areas:

1.1   Teaching: forest economics, consumption survey, forecasting, marketing, socio-economics and entrepreneurship in forestry especially establishment and management of small-scale forestry, in funding schemes, incentives, training and service provision, forest management planning and harvesting, tree planting assessment of land issues related to tree plantations, as well as in forest industry and marketing of forestry products;

1.2      Researchin economics of natural resourcesand Agroforestry.

1.3     Consultancy in Forest and other Natural Resource Economics, Environmental Economics and Socio-economics including the following recent key assignments.

1.4      Administration at Sokoine University of Agriculture

1.4.1      Deputy Vice Chancellor (Administration and Finance)  22nd Dec. 2014 - 21st Dec. 2018.

1.4.2      Dean (re-appointed)  1st July 2014 – 21st Dec. 2014

1.4.3      Dean                            1st July 2011 – 30th June 2014

1.4.4      Head of Department 1st July 2002 – 30th June 2008






2.1.1   Jens Friis Lund, Christian Lund, Christian Pilegaard Hansen, HenrikMeilby, Thorsten Treue, Michael Eilenberg, Yonika Mathew Ngaga, Gimbage Ernest Mbeyale, SantoshRayamajhi, BirBahadurKhanalChhetri and Ridish. K. Pokharel. Science and Power in Participatory Forestry. Funded byDanida, 01/01/2014 - 31/12/2018. MAIN OTUPUT: 2 PHD STUDENTS




2.2.1.    Thorsten, T., J. F. Lund, I. Theilade, D. Brockington, N. Burgess, Y. M. Ngaga, G. C. Kajembe and S.A.O. Chamshama. Applied research in participatory forest management (PFM) - assessing under which conditions PFM contributes to the goals of poverty reduction, sustainable forest management and improved local governance. Funded by Danida& Ministry of Natural Resources and Tourism, 2007-2009.

2.2.2     Thorsten, T., F. Helles, J. F. Lund, I. Theilade, H. Meilby, M.A. Whyte, Q. Gausset, Y. M. Ngaga, G. C. Kajembe and S.A.O. Chamshama. ENRECA project: Participatory forest management for rural livelihoods, forest conservation and good governance in Tanzania. Funded by Danida, 2008-2011.

2.2.3     Kessy, J. F., Angelsen, A., Ngaga, Y. M., Lusambo, L. P., Kingazi, S. P., Nyamoga, G. Z., Lalika, M. C. S., Mombo, F. M., Meshack, C. and Lyimo, E. L..Governance, Incentives and Monitoring in REDD. Research project Under Climate Change, Adaptation and Mitigation (CCIAM) Programme.

2.2.4     Lusambo, L. P., Kessy, J. F. Ngaga, Y. M., Kingazi, S. P., Nyamoga, G. Z., Lalika, M. C. S., Mombo, F. M., Lupala, J. M. and Midtgaard. F. Economic Evaluation of Incremental Biomass under PFM and Its Potential as a management Incentives Under REDD Initiatives in Tanzania. Research project Under Climate Change, Adaptation and Mitigation (CCIAM) Programme.





3.1       Lalika, M. C.S.,  Meirea,  P., Ngaga, Y. M. and Ngowi, S.E. 2013. Analysing Ecosystem Services at Watershed Scale: Implications for Conservation in Upper  Kikuletwa Sub-Catchment, Tanzania. Proceedings of the Summer School Workshop, 4th - 12th MRCH 2013, Khartoum/El-Obeid, Sudan.  "Welcome to Africa Programme".  Scientific Cooperation Network on Climate Change Adaptation in Eastern Africa..  Pp 204 - 223.

3.2       Lalika, M.C.S., Meire, P. and Y.M. Ngaga. 2015a.  Exploring watershed conservation and water governance along the Pangani River Basin, Tanzania. Land Use Policy, 48:351-361.

3.3       Lalika, M.C.S., Y.M. Ngaga and Chang'a L. 2015b. Watershed dynamics and climate change and climare variability along Pangani River Basin, Tanzania.Ecohydrology and Hydrobiology, 15 (1): 26 – 38.

3.4       Lalika, M.C.S., Meire, P. and Y.M. Ngaga. Can irrigated agriculture

work as adaptation strategy in climate stressed environment? Empirical evidence from PanganiRiver Basin Tanzania.Land Use Policy (revised and submitted).

3.5       Lalika, M.C.S.,Meire., P. Ngaga, Y. M. and Sanga, G.J. Willingness to Pay for Watershed Conservation: Are we applying the right paradigm? Ecohydrology and Hydrobiology,(Revised and submitted).

3.6       Funder, M., F. Danielsen, Y. M. Ngaga, M. R. Nielsen and M. K. Paulsen, (in press). The social dynamics of participatory monitoring in Tanzania’s community managed forests. Journal of Conservation and Society.

3.7       M. Schaafsma, S. Morse-Jones, P. Posen, R.D. Swetnam, A. Balmford, I. J. Bateman, N. D. Burgess, S. A. O. Chamshama, B. Fisher, R. E. Green, A. S. Hepelwa, A. Hernandez-Sirvent, G. C. Kajembe, K. Kulindwa, J. F. Lund, L. Mbwambo, H. Meilby, Y. M. Ngaga, I. Thelade, T. Treue, V. G. Vyamana and R. K. Turner. 2012 (in press).Torwards transferable functions for extraction of non-timber forest products: A case study on charcoal production in Tanzania. J. of Ecological Economics

3.8       Ezekiel, E., S. A. O. Chamshama, Y. M. Ngaga and M. A. Mndolwa, 2012 (in press). Effects of specing and cutting management on survival, growth and biomass production of Moringaoleifera intercropped with maize on-farm at Gairo inland plateau, Morogoro in Tanzania. Greener Journal of Agricultural Science.

3.9       Musamba, E. B., Y. M. Ngaga, E. K. Boon and R. A. Giliba and TulamwonaDumulinyi, 2011. The Recreation Value of Wetlands: A Case of Lake Victoria in Musoma Municipality, Tanzania.


4.0 Book chapters


4.1 Lalika, M.C.S.,Meire., P. and Ngaga, Y. M. (2015). Paying to Conserve Watershed Services in Pangani River Basin Tanzania. In: Hipel, K, W, Fang, L., Cullmann, J. and Bristow, M. (eds.). "Conflict Resolution in Water Resources and Environmental Management". Springer (Heidelberg). Germany. ISBN 978-3-319-14214-2


4.2 Lalika, M.C.S., de Deckere, E. &Ngaga, Y.M. (2011). Payment for Water Services as Basis for Natural Resource Management: Experience from Pangani Basin Tanzania. In: (Editors Anderson K., Okeyo-Owur, J.B.  andHezron, M.), Towards Implementation of Payment for Environmental Services (PES). BOD Publishers, London. VDM Verlag Dr. Müller GmbH & Co. KG, Saarbrücken, Germany. ISBN 978-3-639-35888-9. 404p.







No of PhD students supervised

No of MSc Students supervised







*   2students are still ongoing.

1. Consolata Kapinga.     Production and Marketing in Sawnwood Value Chain from Government and Private Plantations in Mufindi and Kilombero Districts and Dar es Salaam City, Tanzania.

2. Elieseri Sungusia. Understanding Scientific Forestry Practices in Community Based Forest Management in Tanzania,