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| Titel |
Water Erosion in a Two Year Old Stand of Eucalyptus benthamii under three Plantation Methods |
| VerfasserIn |
J. Padilha, I. Bertol, J. Marioti, J. C. Ramos, M. C. Flores, M. S. Tanaka, A. Paz González |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061400
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| Zusammenfassung |
| The preparation of the soil is the main issue of soil management. Thus, it is also one of the
main operations with regard to management of planted forest during the whole productive
process. Soil preparation is thought to directly affect various processes of the hydrologic
cycle, water erosion, crop productivity and, subsequently, play an important role both for the
environment and for the invested capital. Therefore knowledge of the effect of each specific
soil management system on forest production is viewed as an essential issue. Based on these
considerations, the aim of this work was to quantify soil and water losses by water erosion
during the seasons of the year with the highest rainfall intensity in the south hemisphere, i.e.
spring and summer in a two year old stand planted with Eucalyptus benthamii. This
tree species was planted following three different conditions: 1) soil mechanical
preparation in furrows following the land slope, 2) soil mechanical preparation in furrows
dug perpendicular to the slope and 3) semi-mechanical preparation by digging an
individual hole for each plant. The field experiment was located in Otacílio Costa
municipality, SC, Brazil, at the Gropp forest farm owned by the Kablin SA company,
841 m asl altitude. The soil was classified as a “Cambissolo Húmico Alumínico
Léptico” according with the Brazilian Soil Classification System with a slope of
about 0.12 m m-1. The experimental design consisted of randomly located erosion
plots with 3 repetitions, thus a total of 9 plots. The surface area of the plots was
12 x 24 m and they were oriented so that the main side followed the land slope.
Suspended sediments and water losses were channelled to collecting tank at the end of
the plot. Runoff water and eroded sediments were weakly measured, so that they
correspond to cumulative weakly rainfall. The highest soil and water losses were
recorded in plots with furrows dug perpendicular to the slope and the lowest ones
corresponded to the semi-mechanical treatment with individual holes. Soil losses
were 2.6 times greater in the treatment with furrows following the land slope when
compared with the treatment with furrows perpendicular to the slope and this figure was
21.5 when the first treatment was compared with preparation by digging individual
holes. Water losses in the treatment with furrows following the land slope were 3.6
and 4.1 times greater than in treatments with furrows contouring the land slope or
with individual holes, respectively. So, like in annual crops, contour cultivation,
with respect to the land slope, of planted forest stands is also an efficient plantation
system for reducing water erosion when compared with other plantation systems. |
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