). and R. , This indicates that there are better structural conditions 602 for water infiltration into the soil (Guimarães, 2015) under eucalyptus plantations, likely 603 reducing the sediment contribution from these areas. Similar observations were made 604 by Mello, 2007.

, When comparing suspended sediment yields among various 611 undisturbed forest sites, Zimmermann, Francke & Elsenbeer (2012loose soil material. Thus, the transport of soil material probably accelerates 615 during the progressing wet season due to a positive feedback mechanism. The first rains 616 remove the leaf litter in flowlines while transporting relatively little amount of soil, while 617 subsequent events carry increasing amounts of fine soil material which seals 618 macropores in the flowlines. The autors also claim that major rainfalls cause substantial 619 storm-flow, which triggers localized stream channel failure. During these high-620 connectivity events some hillslopes loose more than 200 kg ha -1 of suspended-sediment 621 during a single rainfall event. This illustrates that a well developed tree cover is not 622 necessarily capable of preventing surface erosion and although the vegetation reduces 623 erosion to some degree and forests cannot inhibit erosion completely, reducing the amount of rainfall and redistributing it on a larger area on 608 the ground, 2012.

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;. Oliveira and . Sheridan, as a 636 result of inadequate planning. of geochemical, radionuclide, stable isotopes, organic matter properties, 642 and spectrocolorimetric visible-based-color tracers. The modelled source contributions 643 to sediments suggest that areas with commercial eucalyptus plantations contribute less 644 sediment to rivers than the traditional land use found in the region (natural grasslands 645 and oats pasture fields with extensive cattle). In the eucalyptus catchment, the mean 646 contribution for stream channel, eucalyptus stands and unpaved roads were, 647 respectively, 63, 30 and 7%, considering the GSRV parameters combination, some catchments, forest unpaved roads may 635 contribute up to 90% of the sediment yield, 1998.

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