02091naa a2200337 a 450000100080000000500110000800800410001910000180006024501060007826000090018452012230019365000180141665000150143465000090144965000150145865000100147365000100148365000240149365000130151765000170153065000160154765000110156365000090157465000160158365300140159965300150161365300160162865300140164470000200165877300750167811331952024-05-21       1988    bl uuuu     u00u1 u    #d1 aSHARMA, P. N.  aEffect of clearing native forest (Caatinga) strips on some hydrologic components of micro-watersheds.  c1988  aThe influences of clearing native vegetation (Caatinga) in contour strips at 25 cm vertical interval on evaporation losses in cleared strips, annual runoff efficiency and annuall soil loss on gently sloped micro-waterheds in the arid zones of Northeast Brazil are reported. The alternate native vegetation (Caatinga) strips function very effectively as windbreaks thus reducing evaporation losses substantially in the leeward cleared strips. The runoff measured at the micro-watershed with cleared strips was many-fold lower than the runoff obtained at a completely denuded watershed 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. The annual soil losses in strip cleared watersheds as well as completely denuded waterhed of gentle slopes were negligible. Thus clearing land in alternate contour strips on a micro-watersheds shall substantially improve crop water use efficiency without creating any significant erosion problems. Additionally this treatment will increase runoff for water harvesting for irrigation purposes.  adeforestation  airrigation  asoil  avegetation  awater  aÁgua  aBacia Hidrográfica  aCaatinga  aDesmatamento  aIrrigação  aManejo  aSolo  aVegetação  aArid land  aManagement  aTerra arida  aWatershed1 aSILVA, A. de S.  tPesquisa Agropecuária Brasileiragv. 23, n. 7, p. 781-788, jul. 1988.