01783naa a2200265 a 450000100080000000500110000800800410001902200140006010000170007424501230009126000090021430000140022352010350023765000220127265000140129465000120130865300210132070000270134170000250136870000210139370000150141470000150142970000180144477300550146219314082024-08-13       2012    bl uuuu     u00u1 u    #d  a1631-07131 aBROSSARD, M.  aAnalysis of an illustrative interaction between structural features and earthworm populations in Brazilian ferralsols.  c2012  ap. 41-49.  aFerralsols are characterized by poorly-defined horizons, weak macrostructure and strong development of a fine granular structure comprising subangular micro-aggregates. In this study, the morphological and physical modifications caused by earthworm activity in a clayey ferralsol were analysed. After describing soil structures, undisturbed samples were taken for evaluating aggregates and determining clod bulk density and particle density. Soil water retention properties were measured and an inventory of soil invertebrate macrofauna was created. The structural and porous transformations were due to aggregates created by earthworm activity. Changes in bulk density can be associated with pore modifications caused by a change in the proportions of aggregate types, and a notable reduction of total porosity was measured, tending to increase soil volume with dense aggregates. Structural modifications affected the topsoil down to 0.5 m and water retention between 1 and 33 kPa, the principal water compartment of these soils.  aEstrutura do Solo  aLatossolo  aMinhoca  aCiência do solo1 aFREGONEZI, G. A. DE F.1 aGUIMARÃES, M. de F.1 aMEDINA, C. de C.1 aPASINI, A.1 aVILELA, L.1 aAYARZA, M. A.  tComptes Rendus Geosciencegv. 344, p. 41-49, 2012.