00600naa a2200169 a 450000100080000000500110000800800410001910000200006024501500008026000090023065300130023965300170025265300240026965300210029370000180031477300980033210829272012-01-11       1999    bl uuuu     u00u1 u    #d1 aMENEZES, R.S.C.  aInfluence of tree species on herbaceous understory and soil chemical characteristics in a  silvipastoral system in semi-arid northeastern Brazil.  c1999  aCaatinga  aIlha fértil  aRegião semi-árida  aSustentabilidade1 aSALCEDO, I.H.  tRevista Brasileira de Ciência do Solo, Viçosa, MGgv. 23, n. 4, p. 817-826, out./dez. 1999.