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Research Program
My research program spans from nutrient and
organic matter dynamics in different inorganic and organic pools of soil
to nutrient pathways in agroecosystems. The focus of my research is to
develop and provide applications for environmentally-friendly management
of agricultural landscapes based on sound understanding of the
biogeochemical processes. In temperate agroecosystems, the minimization of
environmental pollution and off-site effects stands in the center of my
work. With a large part of my research based in tropical ecosystems, my
work there focuses on replenishing soil fertility and combating soil
degradation. The landuse systems investigated range from continuous
cultivation, to shifting cultivation, reduced-impact logging and
agroforestry systems to organic farming including the application of
stable carbon compounds (bio-char
or charcoal). I am especially interested in nutrient and carbon
turnover in soils and fluxes within soils and across ecosystem boundaries
to aquatic ecosystems. Carbon sequestration in the context of climate
change and black carbon dynamics are of special interest. Our team
increasingly utilizes advanced spectroscopic techniques such as
synchrotron-based NEXAFS and FTIR for the micro- and nano-scale
observation of biogeochemical cycles in soils. An important focus of our
work is the study of so-called Terra
Preta de Indio (Amazonian Dark Earths), anthropogenic soils with high
fertility and carbon contents which were created by Amerindian populations
and persisted over centuries showing a remarkable resilience to
degradation. In my research group we follow an interdisciplinary approach
with cooperations across disciplines and outreach to both development and
application.
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Courses
Taught
CSS
372/472: Nutrient Management and Research in Agroecosystems (including
analytical laboratory course) (more
information)
CSS 672:
Nutrient Cycling in Natural and Managed Ecosystems (more
information)
Selected Publications
Lehmann J, Lan Z, Hyland C, Sato S, Solomon D, and Ketterings Q 2005
Long-term dynamics of phosphorus forms and retention in manure-amended
soils. Environmental Science and Technology 39: 6672-6680.
Lehmann J, Liang B, Solomon D, Lerotic M, Luizão F, Kinyangi F, Schäfer
T, Wirick S, and Jacobsen C 2005 Near-edge X-ray absorption fine structure
(NEXAFS) spectroscopy for mapping nano-scale distribution of organic
carbon forms in soil: application to black carbon particles. Global
Biogeochemical Cycles 19: GB1013.
Major J, Steiner C, DiTommaso A, Falcão NPS and Lehmann J 2005 Weed
composition and cover after three years of soil fertility management in
the central Brazilian Amazon: compost, fertilizer, manure and charcoal
applications. Weed Biology and Management 5: 69-76
Sato S, Solomon D, Hyland C, Ketterings QM and Lehmann J 2005
Phosphorus speciation in manure and manure-amended soils using XANES
spectroscopy. Environmental Science and Technology 39: 7485-7491.
Schwendener CM, Lehmann J, Camargo PB, Luizão RCC and Fernandes ECM
2005 Nitrogen transfer between high- and low-quality leaves on a
nutrient-poor Oxisol determined by 15N enrichment. Soil Biology and
Biochemistry 37: 787-794.
Solomon D, Lehmann J, Kinyangi J, Liang B and Schäfer T 2005 Carbon
K-edge NEXAFS and FTIR-ATR Spectroscopic Investigation of Organic Carbon
Speciation in Soils. Soil Science Society of America Journal 69, 107-119.
Renck A and Lehmann J 2004 Rapid water flow and transport of inorganic
and organic nitrogen in a highly aggregated tropical soil. Soil Science
169: 330-341.
Lehmann J, Kern DC, Glaser B and Woods WI 2003 Amazonian Dark Earths:
Origin, Properties, Management. Kluwer Academic Publishers, The
Netherlands, 523p.
Lehmann J, da Silva Jr. JP, Steiner C, Nehls T, Zech W and Glaser B
2003 Nutrient availability and leaching in an archaeological Anthrosol and
a Ferralsol of the Central Amazon basin: fertilizer, manure and charcoal
amendments. Plant and Soil 249: 343-357.
Lehmann J 2003 Subsoil root activity in tree-based cropping systems.
Plant and Soil 255: 319-331.
Solomon D, Lehmann J and Martinez CE 2003 Sulfur K-edge XANES
spectroscopy as a tool for understanding sulfur dynamics in soil organic
matter. Soil Science Society of America Journal, 67: 1721-1731.
Lehmann J, Gebauer G and Zech W 2002 Nitrogen cycling assessment in a
hedgerow intercropping system using N-15 enrichment.
Nutrient Cycling in Agroecosystems 62: 1-9.
Glaser B, Lehmann J, and Zech W 2002 Ameliorating physical and chemical
properties of highly weathered soils in the tropics with charcoal - a
review. Biology and Fertility of Soils 35: 219-230.
Solomon D, Fritzsche F, Lehmann J, Mamo T and Zech W 2002 Soil organic
matter dynamics in the subhumid agroecosystems of the Ethiopian highlands:
evidence from natural 13C abundance and
particle size fractionation. Soil Science Society of America
Journal 66: 969-978.
Lehmann, J, and Muraoka, T 2001 Tracer applications for assessing
nutrient uptake distribution in multi-strata agroforestry systems.
Agroforestry Systems 53: 133-140.
Lehmann, J, Cravo MS and Zech W 2001 Organic matter stabilization in a
Xanthic Ferralsol of the central Amazon as affected by single trees:
chemical characterization of density, aggregate and particle size
fractions. Geoderma 99: 147-168.
Lehmann J, Muraoka T and Zech W 2001 Root activity patterns in an
Amazonian agroforest with fruit trees determined by 32P, 33P, and
15N applications. Agroforestry
Systems 52: 185-197.
Lehmann, J, Cravo MS, Macedo JLV, Moreira A and Schroth G 2001
Phosphorus management for perennial crops in central Amazonian upland
soils. Plant and Soil 237: 309-319.
Schroth G, Lehmann J, Barros E, Rodrigues MRL and Macedo JLV 2001
Plant-soil interactions in multistrata agroforestry in the humid tropics.
Agroforestry Systems 53: 85-102.
Lehmann J, da Silva Jr. JP, Schroth G, Gebauer G and da Silva LF 2000
Nitrogen use in mixed tree crop plantations with a legume cover crop.
Plant and Soil 225: 63-72.
Peter I and Lehmann J 2000 Pruning effects on root distribution and
nutrient dynamics in an acacia hedgerow planting. Agroforestry
Systems 50: 59-75.
Solomon, D and Lehmann, J 2000 Loss of phosphorus from soil in
semi-arid northern Tanzania as a result of cropping: evidence from
sequential extraction and 31P NMR
spectroscopy. European Journal of Soil Science 51: 699-708.
Solomon, D, Lehmann, J and Zech, W 2000 Land use effects on soil
organic matter properties of chromic Luvisols in the semiarid tropics:
Carbon, nitrogen, lignin and carbohydrates. Agriculture, Ecosystems and
Environment 78: 203-213.
Lehmann, J, Peter, I, Steglich, C, Gebauer, G, Huwe, B and Zech, W 1998
Below-ground interactions in dryland agroforestry. Forest Ecology and
Management 111: 157-169.
List of
publications |
