Martha sucht…

www.alumniportal-deutschland.org

Webinar-Serie zur NachhaltigkeitTEIL I: Ökologische Konzepte

•22. April, 18-19 Uhr (UTC+1): Vom Wert der Arten: Biodiversität als Lebensgrundlage (auf Deutsch)

•26. April, 17-18 Uhr (UTC+1): Plenteous oceans? How we can win the battle against overfishing (in English)

•29. April, 18-19:30 Uhr (UTC+1): Alumni präsentieren ihre Forschungsprojekte (auf Deutsch/ Englisch)

Prof. Dr. Jens GebauerSustainable Agricultural Production Systems

with Special Focus on Horticulture

Indigenous Fruit Trees in Africa

Genetic improvement

• Number of local types, growth shape, size, fruits (taste, shape, sweetness), bark …

• No varieties are available in Sudan (ecotypes)

7

12

Selected References• Sennhenn A, Prinz K, Gebauer J, Whitbread A, Jamnadass R, Kehlenbeck K 2013 Identification of mango (Mangifera indica L.) landraces

from Eastern and Central Kenya using a morphological and molecular approach. Genetic Resources and Crop Evolution: accepted• Gebauer J, Bernholt H, Hammer K 2013 Grewia flavescens: a potential horticultural crop? Genetic Resources and Crop Evolution:

accepted• Gebauer J, Luedeling E 2013 A note on baobab (Adansonia digitata L.) in Kordofan, Sudan. Genetic Resources and Crop Evolution

60:1587-1596• Goenster S, Wiehle M, Kehlenbeck K, Jamnadass R, Gebauer J, Buerkert A 2011 Indigenous fruit trees in homegardens of the Nuba

Mountains, Central Sudan: tree diversity and potential for improving nutrition and income of rural communities. Acta Horticulturae 911:355-364

• Hunsche M, Buerling K, Saied A S, Schmitz-Eiberger M, Kundi S, Gebauer J, Noga G, Buerkert A 2010 Surface properties, chlorophyll fluorescence and light remission, and cellular compounds of Grewia tenax (Forssk.) Fiori and Tamarindus indica L. leaves as affected by NaCl treatments. Plant Growth Regulation 61:253-263

• Thompson J L, Gebauer J, Hammer K, Buerkert A 2010 The structure of urban and peri-urban gardens in Khartoum, Sudan. Genetic Resources and Crop Evolution 57:478-500

• Thompson J L, Gebauer J, Buerkert A 2010 Fences in urban and peri-urban gardens of Khartoum, Sudan. Forests, Trees and Livelihoods 19:379-391

• Saied A, Sohail M, Gebauer J, Buerkert A 2010 Response of Grewia tenax (Forssk.) Fiori to NaCl-induced salinity. European Journal of Horticultural Science 75:42-50

• Bernholt H, Kehlenbeck K, Gebauer J, Buerkert A 2009 Plant species richness and diversity in urban and peri-urban gardens of Niamey, Niger. Agroforestry Systems 77:159-179

• Saied A, Gebauer J, Hammer K, Buerkert A 2008 Ziziphus spina-christi (L.) Willd.: a multipurpose fruit tree. Genetic Resources and Crop Evolution 55:929-937

• Gebauer J, El-Siddig K, El-Tahir B A, Salih A A, Ebert G, Hammer K 2007 Exploiting the potential of indigenous fruit trees: Grewia tenax in Sudan. Genetic Resources and Crop Evolution 54:1701-1708

• Gebauer J, El-Siddig K, Ebert G 2002 Baobab (Adansonia digitata L.): a review on a multipurpose tree with promising future in the Sudan. European Journal of Horticultural Science 4:155-160

• Gebauer J, El Siddig K, Salih A A, Ebert G 2004 Tamarindus indica L. seedlings are moderately salt tolerant when exposed to NaCl-induced salinity. Scientia Horticulturae 103:1-8

Thank you for your attention!

Ecosystems are changing.

Ecosystems are changing.

Abiotic pressures such as climatic change are altering Net primary production and species distributions in many areas.

Ecosystems are changing.

Similarly biotic pressures, such as invasive plants and animals, are changing the diversity and function of many ecosystems.

Ecosystems are changing.

Similarly biotic pressures, such as invasive plants and animals, are changing the diversity and function of many ecosystems.

Ecosystems are changing.

abiotic

biotic

abiotic

biotic

×

Ecosystems are changing.

abiotic

biotic

abiotic

biotic

×

Understanding how abiotic, biotic, and the interaction between abiotic and biotic factors impact ecosystem structure and function is what ecosystem ecology is all about.

abiotic

biotic

abiotic

biotic

×

How will ecosystems function in the future?

How will ecosystems function in the future?

How will ecosystems function in the future?

How will ecosystems function in the future?

How will ecosystems function in the future?

Plant communities are changing.

1996

Modified from Mueller, et al. 2005

1996

Modified from Mueller, et al. 2005

1996

Modified from Mueller, et al. 2005

1996

Modified from Mueller, et al. 2005

2002

1996

Modified from Mueller, et al. 2005

2002

47% decline

1996

Modified from Mueller, et al. 2005

2002

47% decline

Belowground communities?

Soil communities might play a role in plant community change.

Soil communities might play a role in plant community change.

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✕✕

✕

Soil communities might play a role in plant community change.

✕✕

✕✕

✕

Experiments can help us predict how ecosystems will function in the future.

Changing abiotic factorsFree Air CO2 Experiment (FACE), Oak Ridge Tennessee, USA

Changing abiotic factors

Precipitation manipulation, Sevietta New Mexico, USA

Changing biotic factors

Sunset Crater herbivore manipulation, Flagstaff, Arizona, USA

Sunset Crater herbivore manipulation, Flagstaff, Arizona, USA

Changing biotic factors

Hemlock study, Coweeta Lab, North Carolina, USA

Changing biotic factors

Hemlock study, Coweeta Lab, North Carolina, USA

Changing biotic factors

How will ecosystems function in the future?

(1) Plant communities will change.

How will ecosystems function in the future?

(1) Plant communities will change.

(2) Soil communities might play a role in these changes.

How will ecosystems function in the future?

(1) Plant communities will change.

(2) Soil communities might play a role in these changes.

(3) Experiments can help us predict how ecosystems will function in the future.

How will ecosystems function in the future?

questions