Holm Voigt

Research themes
  • Water Resources
  • Land use and food security
  • Sustainable use of natural resources
  • Environmental Impact Analysis
  • Land, water, food and energy
Research countries
  • Uzbekistan
  • Iran
Research projects

Water is a critical resource in the lower reaches of the Amu Darya due to climate aridity and high demands of irrigated agriculture and hydropower in the river basin. In the study region of Khorezm the decades of intensive irrigation led to elevated groundwater tables, resulting in ubiquitous soil salinization and adverse impact on crop production. The afforestation of degraded cropland patches with salt-tolerant trees that draw on groundwater, showed to be effective in increasing the land’s productive and carbon sink potential while contributing to rural income.

This study addresses the impact of tree planting on the water and salt balance at the field scale, considering temporal and spatial variations. To this end, the dynamics of groundwater, soil water and solutes as well as the (ground) water use in three tree species are monitored and analyzed. An experimental tree plantation established in 2003 (Yangibazar) was used for estimating tree water use in the 10th and 11th year since afforestation (2012). The study site is characterized by moderate to strong rootzone soil salinity (2-15 dS m-1) as well as saline groundwater (1.4-3.3 dS m-1). Further afforestation sites have been developed and integrated into the monitoring to account for site specific factors.

Main research objectives are

How much water is transported at tree and stand level on different temporal scales?

What are the species-specific variations of water transport?

What are the governing factors controlling water fluxes in the local agroecological Atmosphere-Vegetation-Soil Continuum

Teaching

WS 2012-2013 ARTS-A3 Production systems

SoSe 2013 Geography-B2 Basic field methods

WS 2013-2014 ARTS-A3 Production systems

SoSe 2014 Geography-B2 Basic field methods

Additional Information:
Additional information

German Uzbek Agroforestry Project

Professional experience

2009-2011 GWSP - Research Assistant

2015-2016 Future Earth Research Associate

Degrees

Geography (Diplom)

Funding institutions

Robert Bosch Foundation

Thesis title

Hydrological dimensions of mixed species tree plantations in Khorezm, Uzbekistan

Thesis abstract

Water is a critical resource in the lower reaches of the Amu Darya due to climate aridity and high demands of irrigated agriculture and hydropower in the river basin. In the study region of Khorezm the decades of intensive irrigation led to elevated groundwater tables, resulting in ubiquitous soil salinization and adverse impact on crop production. The afforestation of degraded cropland patches with salt-tolerant trees that draw on groundwater, showed to be effective in increasing the land’s productive and carbon sink potential while contributing to rural income.

This study addresses the impact of tree planting on the water and salt balance at the field scale, considering temporal and spatial variations. To this end, the dynamics of groundwater, soil water and solutes as well as the (ground) water use in three tree species are monitored and analyzed. An experimental tree plantation established in 2003 (Yangibazar) was used for estimating tree water use in the 10th and 11th year since afforestation (2012). The study site is characterized by moderate to strong rootzone soil salinity (2-15 dS m-1) as well as saline groundwater (1.4-3.3 dS m-1). Further afforestation sites have been developed and integrated into the monitoring to account for site specific factors.

Main research objectives are

How much water is transported at tree and stand level on different temporal scales?

What are the species-specific variations of water transport?

What are the governing factors controlling water fluxes in the local agroecological Atmosphere-Vegetation-Soil Continuum

 

2017

Holm Voigt, Asia Khamzina, Bernd Diekkrüger, Inken Rabbel. 2017. Quantifying stand water use through sapflux and groundwater measurements at a multi-species afforestation site in Uzbekistan, Central Asia. Further Information
Holm Voigt, Bernd Diekkrüger, Asia Khamzina, Inken Rabbel. 2017. Stand water use assessed by diurnal groundwater oscillations – an alternative approach to sapflux quantification. Further Information
Holm Voigt, Maximilian Weigand, Andreas Kemna, Bernd Diekkrüger. 2017. Sensing sap flow by electrical self-potential measurements. Further Information

2016

Bhaduri A., J. Bogardi, A. Siddiqi, H. Voigt, C. Vörösmarty, C. Pahl-Wostl, S. E. Bunn, P. Shrivastava, R. Lawford, S. Foster, H. Kremer, F. G. Renaud, A. Bruns and V. R. Osuna. 2016. Achieving sustainables development goals from a water perspective. Frontiers in Environmental Science, doi: 10.3389/fenvs.2016.00064. (Open Access)
Rabebel I, Diekkrüger, B., Voigt H. and B. Neuwirth. 2016. Comparing ∆Tmax Determination Approaches for Granier-Based Sapflow Estimations. Sensors, 16 (12): 2042, DOI:10.3390/s16122042.

2015

Voigt H.. 2015. Earth Observations and Education for the Sustainable Implementation of the Nexus Approach. Change and Adaptation in Socioecological Systems, 2: 119-121. (Open Access) Download [PDF | 78.87KB]

2013

Holm Voigt, Sujan Maharjan, Asia Khamzina. 2013. Afforestation of degraded cropland as part of integrated agricultural water and land management in Khorezm, Uzbekistan. Further Information

2011

Kistemann, Th., Ch. Höser and H. Voigt. 2011. Mapping Water and Health: Current Applications and Future Developments. Further Information

Voigt, H.. Impacts of mixed species tree plantations on the hydrological regime in an arid catchment in Uzbekistan under the pressure of global change. Faculty of mathematics and natural sciences of the University of Bonn.

Holm Voigt

Researcher Project Management

E-Mail:
hvoigt(at)uni-bonn.de

Phone:
+49-228-73-4944

Department:
ZEF C: Department of Ecology and Natural Resources Management