8 research outputs found
Evaluation of the soil degradation state along fence-line contrasts
Five pairs of Observatories with contrasting landuse types and/
or landuse intensities, located in the Woodland Savanna, Thornbush Savanna,
Nama Karoo, and Succulent Karoo biomes were investigated to examine the
infl uence of landuse on soil properties. To eliminate local characteristics, the
comparison was conducted using the predominant soil types in each pair of
Observatories. For the Woodland Savanna in the Kavango Woodlands, topsoil
properties were statistically different in relation to varying fi re frequency (increased
water soluble ions, C/N-ratio, exchangeable potassium with higher fi re
frequency). For all other pairs of Observatories, contrasting grazing intensities
resulted in some signifi cant differences in topsoil properties. In general,
increased grazing led to higher pH-values and water soluble sodium concentrations
in all regions. It is concluded that these differences are related to shifts
in topsoil hydrology as a consequence of lower vegetation coverage. The use
of soil pH and water soluble cation concentration is predicted to be important
indicators for future rangeland monitoring.BIOTA-Africa and the Federal Ministry of Education and Research of German
Evaluation of the soil degradation state along fence-line contrasts
Five pairs of Observatories with contrasting landuse types and/
or landuse intensities, located in the Woodland Savanna, Thornbush Savanna,
Nama Karoo, and Succulent Karoo biomes were investigated to examine the
infl uence of landuse on soil properties. To eliminate local characteristics, the
comparison was conducted using the predominant soil types in each pair of
Observatories. For the Woodland Savanna in the Kavango Woodlands, topsoil
properties were statistically different in relation to varying fi re frequency (increased
water soluble ions, C/N-ratio, exchangeable potassium with higher fi re
frequency). For all other pairs of Observatories, contrasting grazing intensities
resulted in some signifi cant differences in topsoil properties. In general,
increased grazing led to higher pH-values and water soluble sodium concentrations
in all regions. It is concluded that these differences are related to shifts
in topsoil hydrology as a consequence of lower vegetation coverage. The use
of soil pH and water soluble cation concentration is predicted to be important
indicators for future rangeland monitoring.BIOTA-Africa and the Federal Ministry of Education and Research of German