Efecto del tipo de cama de siembra y disturbio sobre el establecimiento de gramíneas nativas bajo condiciones árida

Abstract

The assay was carried out with the objective of analyzing the answer of native grass, on degraded pasturages, approaching the hypothesis that the type of sowing bed and disturbance of the ground dramatically favor the recovery of these areas. The study was lead during the years 1999 and 2000, in the Farm «El Halcon», Zacatecas, Mexico, selecting an over grazed site, where the following treatments were assigned: traditional exclusion, re sowing, wadding with branches, manual disturbance, animal stepping, and animal stepping plus patching. The observations were carried out at the end of each growth stage for both periods, and the received precipitation was of 76 and 134 mm, respectively. The ob tained results demonstrate the consistency of the effect of the animal stepping plus patching, like the most efficient treatment in the monthly recovery of the vegetal cover and aerial production of phytomass, with values of 2.02 and 5.60 % and one 49.38 production 35.58 and g m -2 for every period, respectively. The above mentioned states the impor tance of the superficial decompactation in the increase of the effective precipitation, as well as shaded of the ground, slowing down the evaporation and thus improving the microatmosphere of the seed bank, which allowed the establishment of graminea communi ties in these sites. Finally, a greater response for years with normal precipitation is foresee able, since the precipitation received during the study, was atypical for the area, taking into account the data recorded from 1962, for the locality.