02067naa a2200217 a 450000100080000000500110000800800410001910000180006024501070007826000090018550001640019452012280035865000150158665300320160165300320163365300290166565300300169465300160172470000200174077300890176011069332018-08-23       1988    bl uuuu     u00u1 u    #d1 aSHARMA, P. N.  aEffect of clearing native forest (Caatinga) strips on some hydrologic componentes of micro-watersheds.  c1988  aTítulo em português: Efeito do desmatamento em faixas de vegetação nativa de Caatinga sobre alguns componentes hidrológicos de microbacias hidrográficas.  aThe influences of clearing native vegetation (Caatinga) in contour strips at 25 cm vertical interval on evaporation Iosses in cleared strips, annual runoff efficiericy and annual soil loss on gently sloped micro-waterheds in the arid zones of Northeast Brazil are reported. T11e alternate native vegetation (Caatinga) strips function very effectively as windbreaks thus reducing evaporation losses substantially in the lemard cleared strips. Mio runoff measured at the micro-watershed wíth cleared strips was many-fold lower than the runoff obtained at a completely denuded waterslied even when it was protected by narrow based channel terraces. However, the annual runoff efficiency can be significantly increased in a strip cleared watershed if narrow based channel terraces are provided on the lower side of cleared strips. Tbe annual soil Iosses in strip eleared watersheds as weli as completely denuded watershed of genfle slopes were negligible. Pius cleaxing land in alternate contour strips on a rnicro-watersheds shall substantially improve crop water use efficiency without creating any signíficant crosion problems. Additionaily this treatment will increase runolf for water harvesting for irrigation purposes.  awindbreaks  aforest watershed management  aIrrigação de terra árida  airrigation of arid lands  aManejo de bacia florestal  aQuebravento1 aSILVA, A. de S.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 23, n. 7, p. 781-788, jul. 1988