Resumo

GAMERO-GAMERO, Angel Mariano et al. Soil characteristics due to resting time in a slash and burn system. Ecosistemas y recur. agropecuarios [online]. 2020, vol.7, n.1, e2098.  Epub 30-Maio-2020. ISSN 2007-901X.  https://doi.org/10.19136/era.a7nl.2098.

The study of traditional agricultural systems performs an option for natural-ecosystems conservation and increase crop production. The slash-and-burn system (RTQ) has been declared obsolete and harmful, but this outlook is inconclusive. The aim of this study is to promote a better understanding of its ecological dynamics, which can guide for take decisions of the rational management of the ecosystems where it is located. A fallow chronosequence of the RTQ was analyzed in a tropical deciduous forest on leptosols, with the objective of describing the relationship of the microbial communities with the fallow period and soil organic matter. It is reported the heterotrophic bacteria functional diversity (Shannon index - H') and its activity, since metabolic profile of the microbial populations using BIOLOG-ECOTM plates, organic matter content, total nitrogen, nitrate, ammonium, extractable phosphorus, texture, bulk density, field capacity and permanent wilting point. The soil physical properties were similar at all over plots. Fallow time affected pH, organic-matter ad nitrates content. No clear relation was found between H' and the fallow time (t) but there were H' significant differences (p < 0.05) between higher and less fallow time.

Palavras-chave : Heterotrophic bacteria; tropical dry forest; Shannon diversity index; functional diversity; Tierra Caliente.

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