Overview

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.

Research Focus

Soil biogeochemistry with a focus on soil organic matter as it relates to climate change, bio-energy, and sustainable agriculture (mainly in Africa).

Instruction Focus

Nutrient management with a focus on basic understanding of soil biogeochemistry, nutrient cycling, environmental pollution and sustainable agriculture.

Additional Links

• Bio-char and Terra Preta
• Link to CALS Research portal
• Link to CALS Impact statements

Professional Activities

• Lehmann J, Cheng CH, Nguyen B, Liang B, Major J and Smernik R 2007 Permanency and long-term changes of bio-char in soil. International Agrichar Initiative (IAI) 2007 Conference, April 27-May 2 2007, Terrigal, Australia. p. 23. - 2007
• Lehmann J and Sohi S 2006 Bio-char (Black Carbon) Stability and Stabilization in Soil. In World Congress of Soil Science, 9-14 July 2006, Philadelphia. Abstract 16146, oral presentation 72-1. - 2006
• Lehmann J, Rondon M, Major J, Kimetu J, Cheng C, Trujillo L, Day D, Liang B, Gaunt J, Sohi S, Solomon D and Luiz?o F 2006 Terra Preta: Opportunities for Meeting Global Challenges of Soil Degradation and Climate Change. AAAS Annual Meeting, 16-20 February 2006, St. Louis, MI. Booklet p. 117, abstract CD ROM. - 2006
• Lehmann J, Solomon D and Kinyangi J 2006 Chemical speciation of organic matter on mineral surfaces and in micro-pores using NEXAFS. Soil Science Society of America, Annual Meeting, Indianapolis, November 12-16. Abstract No. 183-4. - 2006
• Lehmann J, Solomon D and Kinyangi J 2006 In-situ assessment of the spatial association of organic carbon and clay mineral forms in soil. Soil Science Society of America, Annual Meeting, Indianapolis, November 12-16. Abstract No. 119-6. - 2006

Selected Publications

• Lehmann J, Kinyangi J and Solomon D 2007 Organic matter stabilization in soil microaggregates: implications from spatial heterogeneity of organic carbon contents and carbon forms. Biogeochemistry 85: 45-57.
• Lehmann J 2007 A handful of carbon. Nature 447: 143-144.
• Lehmann J 2007 Bio-energy in the black. Frontiers in Ecology and the Environment 5: 381-387.
• Schrumpf M, Axmacher JC, Zech W, Lehmann J and Lyaruu HVC 2007 Long-term effects of rainforest disturbance on the nutrient composition of throughfall, organic layer percolate and soil solution at Mt. Kilimanjaro. Science of the Total Environment 376: 241-254.
• Solomon D, Lehmann J, Kinyangi J, Amelung W, Lobe I, Ngoze S, Riha S, Pell A, Verchot L, Mbugua D, Skjemstad J and Sch?fer T 2007 Long-term impacts of anthropogenic perturbations on the dynamics and molecular speciation of organic carbon in tropical forest and subtropical grassland ecosystems. Global Change Biology 13: 511-530.
• Solomon D, Lehmann J, Thies J, Sch?fer T, Liang B, Kinyangi J, Neves E, Petersen J, Luiz?o F and Skjemstad J 2007 Molecular signature and sources of biochemical recalcitrance of organic C in Amazonian Dark Earths. Geochimica et Cosmochimica Acta 71: 2285-2298.
• Johnson MS, Lehmann J, Selva EC, Abdo M, Riha S and Couto EG 2006 Organic carbon fluxes within and streamwater exports from headwater catchments in the southern Amazon. Hydrological Processes 20: 2599-2614.
• Johnson MS, Lehmann J, Couto EG, Novaes-Filho JP and Riha S 2006 DOC and DIC in flowpaths of Amazonian headwater catchments with hydrologically contrasting soils. Biogeochemistry 81: 45-57.
• Lehmann J, Gaunt J and Rondon M 2006 Bio-char sequestration in terrestrial ecosystems ? a review. Mitigation and Adaptation Strategies for Global Change 11, 403-427.
• Cheng CH, Lehmann J, Thies JE, Burton SD and Engelhard MH 2006 Oxidation of black carbon by biotic and abiotic processes. Organic Geochemistry 37: 1477-1488. DOI:10.1016j.orggeochem.2006.06.022.

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