Soil
organic matter stability of Terra Preta soils (red indian black earth)
in the Amazon region, Brazil
Soil
organic matter stability of Terra Preta soils (red indian black earth)
in the Amazon region, Brazil
Optimizing Biomass Production in a Runoff Agroforestry System in Northern
Kenya
Effects of land-use changes on soil fertility in the silvi-pastoral system
of Northern Tanzania
Water and nutrient fluxes as indicators for stability of different land
use systems on the Terra firme near Manaus
Fate
of agrochemicals in the Pantanal Basin of Mato Grosso, Brazil
Nutrient
budget in undisturbed and disturbed ecosystems of the South Ecuadorian
Andes
Water
and nutrient fluxes as indicators for sustainable land use in the Cerrado
region of Brazil
Optimizing Biomass Production in a Runoff Agroforestry System in Northern Kenya
Period: 1994-1997
Location: Northern Kenya
Objectives: - determination of nutrient fluxes in agroforestry with hedgerow intercropping in a semiarid tropical environment
- influence of intercropping, planting density and pruning intensity
- below-ground tree-crop interactions concerning soil nutrients and roots
Methods: soil chemical analyses (including different soil nutrient pools, physical fractionation, lignin, sugars, 13C and 31P NMR), plant analyses, tensiometry, suction cups, exchange resin boxes, heat pulse technique, minirhizotron, destructive root sampling, tracer techniques (N-15)
Project title: Effects of land-use changes on soil fertility in the silvi-pastoral system of Northern Tanzania
Period: 1997-1998
Location: Northern Tanzania
Objectives: - effect of large- and small-scale farming on soil organic matter and soil fertility in comparison to natural woodland
Methods: - field survey
- particle and aggregate size fractionation of soil
and subsequent analyses of the chemical composition of soil organic matter
(lignin, carbohydrates, amino-sugars, NMR spectroscopy), C- and N-mineralization
Responsible:Johannes Lehmann
Period: 1995-2001
Location: Manaus, Brazil
comparing primary and secondary forests with multiple cropping systems and monocultures
Methods: - analyses of soil and plant nutrients, throughfall, stemflow, soil nutrient fluxes with tensiometry, suction cups, heat pulse technique (N-15; P-32) and natural abundance
- application of tracer techniques to follow pathways of nutrients
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Established: 08.09.1998 |