Land use change effects on runoff and erosion from plot to catchment scale on the basaltic plateau of Southern Brazil

Abstract

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.

On the role of the runoff coefficient in the mapping of rainfall to flood return periods

“…The importance of this coefficient as a lumped indicator of the runoff generation is also confirmed by the interest of the scientific community in recent research (e.g. Naef, 1993;Gottschalk and Weingartner, 1998;Dos Reis Castro et al, 1999;Cerdan et al, 2004;Merz et al, 2006;Merz and Blöschl, 2009).…”

On the role of the runoff coefficient in the mapping of rainfall to flood return periods

“…The importance of this coefficient as a lumped indicator of the runoff generation is also confirmed by the interest of the scientific community in recent research (e.g. Naef, 1993;Gottschalk and Weingartner, 1998;Dos Reis Castro et al, 1999;Cerdan et al, 2004;Merz et al, 2006;Merz and Blöschl, 2009).…”

Hydraulic Causes for Basin Hydrograph Skewness

“…The second selected basin is on river Turvo, at a place where drainage area is 1,887 km 2 , main river length is 223 km, and altitude varies between 590 and 150 m. In contrast to the rounded basin, the Turvo river basin has an elongated shape, as suggested by the length of the main river, which is more than two times longer. Therefore, we refer to the second basin as the “elongated basin.” More details about the geographical context are given in Chevallier and Dhein (), Castro et al (), and Mendiondo et al ().…”

“…Therefore, we refer to the second basin as the ''elongated basin.'' More details about the geographical context are given in Chevallier and Dhein (1993), Castro et al (1999), and Mendiondo et al (2007).…”

Long Term of Soil Carbon Stock in No-Till System Affected by a Rolling Landscape in Southern Brazil

“…In the study area, the hollows (zero-order catchment) are frequently activated as ephemeral streams within the year, especially during prolonged duration and a large volume of rainfall (personal observation). If the concave slope and hollows are sensible to produce convergent runoff in a basaltic plateau landscape [53], then this may affect the local soil carbon redistribution and exportation from the system as well.…”

On the role of the runoff coefficient in the mapping of rainfall to flood return periods

“…The importance of this coefficient as a lumped indicator of the runoff generation is also confirmed by the interest of the scientific community in recent research (e.g. Naef, 1993;Gottschalk and Weingartner, 1998;Dos Reis Castro et al, 1999;Cerdan et al, 2004;Merz et al, 2006;Merz and Blöschl, 2009).…”

Hydraulic Causes for Basin Hydrograph Skewness

“…The second selected basin is on river Turvo, at a place where drainage area is 1,887 km 2 , main river length is 223 km, and altitude varies between 590 and 150 m. In contrast to the rounded basin, the Turvo river basin has an elongated shape, as suggested by the length of the main river, which is more than two times longer. Therefore, we refer to the second basin as the “elongated basin.” More details about the geographical context are given in Chevallier and Dhein (), Castro et al (), and Mendiondo et al ().…”

“…Therefore, we refer to the second basin as the ''elongated basin.'' More details about the geographical context are given in Chevallier and Dhein (1993), Castro et al (1999), and Mendiondo et al (2007).…”

Long Term of Soil Carbon Stock in No-Till System Affected by a Rolling Landscape in Southern Brazil

“…In the study area, the hollows (zero-order catchment) are frequently activated as ephemeral streams within the year, especially during prolonged duration and a large volume of rainfall (personal observation). If the concave slope and hollows are sensible to produce convergent runoff in a basaltic plateau landscape [53], then this may affect the local soil carbon redistribution and exportation from the system as well.…”

On the role of the runoff coefficient in the mapping of rainfall to flood return periods

“…The importance of this coefficient as a lumped indicator of the runoff generation is also confirmed by the interest of the scientific community in recent research (e.g. Naef, 1993;Gottschalk and Weingartner, 1998;Dos Reis Castro et al, 1999;Cerdan et al, 2004;Merz et al, 2006;Merz and Blöschl, 2009).…”

Hydraulic Causes for Basin Hydrograph Skewness

“…The second selected basin is on river Turvo, at a place where drainage area is 1,887 km 2 , main river length is 223 km, and altitude varies between 590 and 150 m. In contrast to the rounded basin, the Turvo river basin has an elongated shape, as suggested by the length of the main river, which is more than two times longer. Therefore, we refer to the second basin as the “elongated basin.” More details about the geographical context are given in Chevallier and Dhein (), Castro et al (), and Mendiondo et al ().…”

“…Therefore, we refer to the second basin as the ''elongated basin.'' More details about the geographical context are given in Chevallier and Dhein (1993), Castro et al (1999), and Mendiondo et al (2007).…”

Long Term of Soil Carbon Stock in No-Till System Affected by a Rolling Landscape in Southern Brazil

“…In the study area, the hollows (zero-order catchment) are frequently activated as ephemeral streams within the year, especially during prolonged duration and a large volume of rainfall (personal observation). If the concave slope and hollows are sensible to produce convergent runoff in a basaltic plateau landscape [53], then this may affect the local soil carbon redistribution and exportation from the system as well.…”