Publications
individual publications
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academic article
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Long term effects of manure, charcoal and mineral fertilization on crop production and fertility on a highly weathered Central Amazonian upland soil.
Plant and Soil.
291:275-290.
2007
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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.
2007
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TOC, TON, TOS and TOP in rainfall, throughfall, litter percolate and soil solution of a montane rainforest succession at Mt. Kilimanjaro, Tanzania.
Biogeochemistry.
78:361-387.
2006
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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.
2003
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Soil microbial activities in tree-based systems and natural forests of the Central Amazon Brazil.
Biology and Fertility of Soils.
38.
2003
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Tree species of the central Amazon and soil moisture alter stable isotope composition of nitrogen and oxygen in nitrous oxide evolved from soil.
Isotopes in Environmental and Health Studies.
39:41-52.
2003
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Ameliorating physical and chemical properties of highly weathered soils in the tropics with charcoal - a review.
Biology and Fertility of Soils.
35:219-230.
2002
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Nitrogen cycling assessment in a hedgerow intercropping system using 15N enrichment.
Nutrient Cycling and Agroecosystems.
62:1-9.
2002
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Phosphorus forms and dynamics as influenced by land use in the subhumid Ethiopian highlands.
Geoderma.
105:21-48.
2002
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Soil Organic Matter Composition in the Sub-humid Ethiopian Highlands as Influenced by Deforestation and Agricultural Management.
Soil Science Society of America Journal.
66:68-82.
2002
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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.
2002
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Soil organic matter in the subhumid Ethiopian highlands as influenced by deforestation and agricultural management.
Soil Science Society of America Journal.
66:68-82.
2002
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Carbon and nitrogen mineralization in cultivated and natural savanna soils in Northern Tanzania.
Biology and Fertility of Soils.
33:301-309.
2001
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Inorganic and organic soil phosphorous and sulfur pools in an Amazonian multistrata agroforestry system.
Agroforestry Systems.
53:113-124.
2001
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Land use effects on amino sugar signatures of chromic Luvisols in the semiarid tropics.
Biology and Fertility of Soils.
33:33-40.
2001
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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.
2001
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Root activity patterns in an Amazonian agroforest with fruit trees determined by 32P 33P and 15N applications.
Agroforestry Systems.
52:185-197.
2001
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Sulfur fractions in particle-size separates of the subhumid Ethiopian highlands as influenced by land use changes.
Geoderma.
102:41-59.
2001
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Effects of Deforestation on Phosphorus Pools in Mountain Soils of the Allay Range, Khyrgyzia.
Biology and Fertility of Soils.
31:134-142.
2000
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Effects of Deforestation on Phosphorus Pools in Mountain Soils of the Allay Range, Khyrgyzia..
Biology and Fertility of Soils.
31:134-142.
2000
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Land use effects on soil organic matter properties of chromic Luvisols in the semiarid tropics: Carbon nitrogen lignin and carbohydrates.
Agriculture, Ecosystems & Environment.
78:203-218.
2000
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Soil Organic Matter Pools Quantity and Quality in Mountain Soils of the Allay Range, Kyrgyzia, affected by land use change.
Biology and Fertility of Soils.
31:407-413.
2000
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Emissions of nitrous oxide from runoff-irrigated and rainfed soils in semiarid north-west Kenya.
Agriculture, Ecosystems & Environment.
72:201-205.
1999
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Nitrogen uptake of sorghum from tree mulch and chemical fertilizer under high leaching conditions estimated by 15N enrichment.
Biology and Fertility of Soils.
30:90-95.
1999
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Nutrient cycling in agroforestry with runoff irrigation.
Agroforestry Systems.
43:49-70.
1999
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Nutrient interactions of alley-cropped Sorghum bicolor and Acacia saligna in a runoff irrigation system in Northern Kenya.
Plant and Soil.
210:249-262.
1999
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Below-ground interactions in dryland agroforestry.
Forest Ecology and Management.
111:157-169.
1998
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Fine root turnover of hedgerow intercropping in Northern Kenya.
Plant and Soil.
198:19-31.
1998
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Runoff irrigation of crops with contrasting root and shoot development in the semi-arid North of Kenya: water depletion and above- and below-ground biomass production.
Journal of Arid Environments.
38:479-492.
1998
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Short-term effects of soil amendment with legume tree biomass on carbon and nitrogen in particle size fractions in central Togo.
Soil Biology and Biochemistry.
30:1545-1552.
1998
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Factors controlling humification and mineralization of soil organic matter in the tropics.
Geoderma.
79:117-161.
1997
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Influence of runoff irrigation on nitrogen dynamics of Sorghum bicolor (L.) in Northern Kenya.
Advances in Geoecology.
31:1255-1260.
1997
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Decomposition and nutrient release from leaves twigs and roots of three alley-cropped tree legumes in central Togo (abstract only).
Agroforestry Systems.
29:21-36.
1995
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chapter
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conference paper
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conference poster
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report
