Research and teaching in soil biogeochemistry and soil fertility management. Specialization in soil organic matter and nutrient studies of managed and natural ecosystems. Focus on soil degradation and sustainable agriculture in the tropics (especially Africa), bio-energy, greenhouse gas emissions from soil and headwaters, and synchrotron-based methods for soil research.
: I am interested to advance our general understanding of biogeochemical cycles of carbon and nutrient elements in soil, providing important insight into regional and global element cycles such as the carbon or sulfur cycle. This field of research has global and local relevance with implications for climate change and environmental pollution.
The strong background in the chemistry, biology and physics of soils and its cycles provide the basis for the development of intelligent solutions for sustainable soil and land use management. The most exciting examples include the discovery of stabilization mechanisms of organic matter in soil nano-structures and the development of a biochar soil management technology that improves soil fertility, sequesters carbon and reduces off-site pollution. Recent efforts include the combination of bio-energy and biochar applications to soil, which offer the opportunity to develop a carbon-negative energy technology which at the same time improves the environment.
Nutrient Management in Agroecosystems and Nutrient Cycling in Natural and Managed Ecosystems, Environmental Science Colloquium and support of introductory courses in Environmental Sciences, Traditional Agriculture in Developing Countries and Tropical Cropping Systems.
The goals of my teaching program is to create enthusiasm in students for the study of soil biogeochemistry, soil fertility and nutrient cycling, as they realize the importance of these topics not only for agricultural production but also for environmental protection. A solid knowledge of the basic processes in soil biogeochemistry are required. In the area of environmental sciences, we focus on the pollution of soils and aquifers with inorganic and organic fertilizers, on the effects of atmospheric emissions and on questions regarding soil processes and climate change. The students should get familiar with critical thinking about the impact of land use management on the environment such as soil degradation, climate change or pollution of waterways with agrochemicals. Apart from covering processes and dynamics in temperate agro-ecosystems, particular emphasis is placed on the understanding of constraints and options for nutrient management in tropical environments. The sustainable management of fragile ecosystems under low-input conditions is at the center of such discussions. These three constraints: limited input, environmental protection and sustainability of food production force creative thinking. In order to achieve scientifically sound solutions students need to acquire a profound and integrated understanding of the biological, physical and chemical processes in soil. The students are faced with the challenge to develop previously acquired disciplinary knowledge into more integrated and multidisciplinary thinking.
Awards and Honors
- Highly Cited Researcher (2015) Thomson Reuter
- Hans Fischer Senior Award (2019) Institute for Advanced Studies
- Highly Cited Researcher (2016) Thomson Reuter
- Fellow (2014) Soil Science Society of America
- Highly Cited Researcher (2014) Thomson Reuters
- Lehmann, J., & Kleber, M. (2015). The contentious nature of soil organic matter. Nature. 528:60-68.
- Whitman, T., & Lehmann, J. (2015). A dual-isotope approach to allow conclusive partitioning between three sources. Nature communications. 6.
- Guerena, D., Lehmann, J., Walter, T., Enders, A., Neufeldt, H., Odiwour, H., Biwott, H., Recha, J., Shepherd, K., Barrios, E., & Wurster, C. (2015). Terrestrial pyrogenic carbon export to fluvial ecosystems: Lessons learned from the White Nile watershed of East Africa. Global Biogeochemical Cycles. 29:1911-1928.
- Vanek, S., & Lehmann, J. (2015). Phosphorus availability to beans via interactions between mycorrhizas and biochar. Plant and Soil. 395:105-123.
- Guerena, D., Lehmann, J., Thies, J. E., Enders, A., Karanja, N., & Neufeldt, H. (2015). Partitioning the contributions of biochar properties to enhanced biological nitrogen fixation in common bean (Phaseolus vulgaris). Biology and Fertility of Soils. 51:479-491.
- Zwetsloot, M., Lehmann, J., & Solomon, D. (2015). Recycling slaughterhouse waste into fertilizer: how do pyrolysis temperature and biomass additions affect phosphorus availability and chemistry? Journal of the Science of Food and Agriculture. 95:281-288.
- Abiven, S., Schmidt, M. W., & Lehmann, J. (2014). Biochar by design. Nature Geoscience. 7.
- Whitman, T., Zhu, Z., & Lehmann, J. (2014). Carbon mineralizability determines interactive effects on mineralization of pyrogenic organic matter and soil organic carbon. Environmental Science & Technology. 48:13727Ð13734.
- Lehmann, J., & Rillig, M. (2014). Distinguishing variability from uncertainty. Nature Climate Change. 4:153.
- Simons, A., Solomon, D., Chibssa, W., Blalock, G., & Lehmann, J. (2014). Filling the phosphorus fertilizer gap in developing countries. Nature Geoscience. 7:3.