Land use change effects on runoff and erosion from plot to catchment scale on the basaltic plateau of Southern Brazil
✍ Scribed by Nilza Maria Dos Reis Castro; Anne-Véronique Auzet; Pierre Chevallier; Jean-Claude Leprun
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 130 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0885-6087
No coin nor oath required. For personal study only.
✦ Synopsis
In the region of the basaltic plateau in Southern Brazil, problems of runo and erosion on the deep ferrallitic soils are becoming increasingly recognized. Land use change from conventional tillage using disk plough to no-tillage on residues without terracing occurred at the beginning of the 1990s and it spread very quickly. Measurements of runo and sediment concentrations on 1 m 2 plots receiving natural rainfall and simulated rainfall under dierent crops with dierent stages of growth and dierent tillage systems, ®eld surveys and measurements of rills and gullies in nested experimental catchments indicate a relative decrease of runo on slopes but an increase of subsurface ¯ow, and a marked decrease of sheet and rill erosion and soil loss from plot to catchment scales. Nevertheless, the extension of parts of the gully system is still continuing, strongly in¯uenced by extreme rainfall.