J. Botschek et al., SOIL CHEMICAL-PROPERTIES OF A TOPOSEQUENCE UNDER PRIMARY RAIN-FOREST IN THE ITACOATIARA VICINITY (AMAZONAS, BRAZIL), Geoderma, 72(1-2), 1996, pp. 119-132
Nine soil profiles of a typical toposequence under primary rain forest
of the Amazon area were investigated, distinguishing between Geric Fe
rralsols (Xanthic Kandiudox) in the upper and middle parts of the slop
e and Geri-Haplic Arenosols (Oxyaquic Quartzipsamments) in the lower o
nes, Generally, the soils are strongly acid with very high Al contents
and show extremely low nutrient contents, In spite of this conformity
, significant differences were found referring to the agricultural sui
tability along the toposequence, The decrease of soil potentials from
the top to the lower positions is mainly due to the variation of textu
re.