02463naa a2200517 a 450000100080000000500110000800800410001910000170006024500790007726000090015630000120016552010440017765000170122165000220123865000230126065000190128365000220130265000260132465000150135065000100136565000210137565000250139665000180142165000210143965000260146065000210148665000130150765000170152065000290153765000230156665000120158965000090160165000270161065300170163765300130165465300110166765300220167865300280170065300110172865300090173965300270174865300100177570000140178570000170179977301290181616700282018-12-04       2000    bl uuuu     u00u1 u    #d1 aEMMERICH, S.  aRoot responses of four tropical useful trees to localized soil enrichment.  c2000  ap. 168.  aIn this study the ability to detect and exploit nutrient-rich patches of four tropical useful trees (cupuacu, pupunha, castanha-do-Para, urucu) in an agroforestry system in Amazonia (Manaus-AM-Brasil) was examined. Therefore plastic mesh bags filled with nitrate-, phosphate- or magnesium- enriched soil were installed in the field allowing roots up to 5 mm in diameter to grow into. All four species approximately produced the same amount of root biomass in the mesh bags. castanha-do-Para had a wide spread root system and produced 65% of the rots in the mesh bags in the stem area of the neighboring trees. Urucu had the highest root length density (cm root/cm3 soil) by investing the same amount of root biomass, because of a very small diameter of the fine roots and a high specific root length (cm root/g root dry mass). Of the four species urucu exploited the nutrient enriched soil patches most efficient through its high root length density. The strategy of castanha-do-Para consted in a very wide-ranging exploration of the soil.  aagroforestry  amultiple cropping  anutrient transport  aorganic matter  asoil conservation  atropical rain forests  aAdubação  aAdubo  aBactris Gasipaes  aBertholletia Excelsa  aBixa Orellana  aCastanha do Para  aConservação do Solo  aCultivo Multiplo  aCupuaçu  aFertilizante  aFloresta Tropical Úmida  aMatéria Orgânica  aPupunha  aRaiz  aTheobroma Grandiflorum  aAgrofloresta  aAmazonas  aBrasil  aCastranha do Para  aFertilizers application  aManaus  aRoot  aTransport de nutriente  aUrucu1 aLOSCH, R.1 aLIEBEREI, R.  tIn: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS, 2000, Hamburg. Programa and abstracts... Hamburg: University, 2000.