03011naa a2200577 a 450000100080000000500110000800800410001910000140006024500880007426000090016230000100017152014170018165000170159865000150161565000130163065000120164365000220165565000220167765000150169965000260171465000180174065000210175865000250177965000180180465000210182265000220184365000260186565000210189165000130191265000200192565000290194565000220197465000150199665000170201165000140202865000260204265000120206865000270208065000270210765300170213465300130215165300110216465300170217565300110219265300130220365300260221665300360224265300100227870000160228877301290230416700422019-01-30       2000    bl uuuu     u00u1 u    #d1 aRENCK, A.  aRapid water changes in a highly aggregated Xanthic Ferralsol of the central Amazon.  c2000  ap.182  aWe investigated (i) the soil water dynamics of a Xanthic Ferralsol to a soil depth of 4 m in order to evaluate the extent of rapid water percolation into the subsoil, and (ii) the effect of different indigenous tree crops on soil water contents. TDR and tensiometers were installed und cupuacu, pupunha (peach palm), castanha-do-Para (Brazil nut), urucu (annatto) in a multi-strata agroforestry system, in Manaus-AM (Brasil). After a heavy storm, soilwater suction decreases within a few minutes up to a depth of a 0.9 m-1.5 m, but significantly later at greater depths. Soil water depletion was highest at the topsoil for urucu and cupuacu, and decreased rapidly with depth. In constrat, pupunha took up water homogeneously from the soil profile to l.5 m depth. Castanha-do-Para was not able to utilize subsoil water as well as it was antecipated from the tap root found from root excavations. The legume cover crop pueraria did not take up soil water at a depth of 0.9 m and belos. Soil water dynamics under pupunha may indicate that this palm is better able to utilize subsoil water (0.9 m-1.5 m) and reduce nutrient leaching than the other investigated tree crops or the cover crop. Especially under the high leaching conditions of the aggregated soils and high rainfall regime, nutrient uptake from the topsoil may not reduce nutrient leaching due to the rapid soil water percolation even to greater depths.  aagroforestry  aFerralsols  aleaching  alegumes  amultiple cropping  asoil conservation  asoil water  atropical rain forests  aÁgua do Solo  aBactris Gasipaes  aBertholletia Excelsa  aBixa Orellana  aCastanha do Para  aCobertura do Solo  aConservação do Solo  aCultivo Multiplo  aCupuaçu  aFísica do Solo  aFloresta Tropical Úmida  aLatossolo Amarelo  aLeguminosa  aLixiviação  aNutriente  aPueraria Phaseoloides  aPupunha  aRelação Água-Planta  aTheobroma Grandiflorum  aAgrofloresta  aAmazonas  aBrasil  aCover plants  aManaus  aNutrient  aPlant water relations  aSoil chemicophysical properties  aUrucu1 aLEHMANN, J.  tIn: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS, 2000, Hamburg. Programa and abstracts... Hamburg: University, 2000.