Resumo

MORA-DONJUAN, Carlos Alberto et al. Diversity and plant composition of a microphyll desert scrubland area, with livestock history land use, in northeast of México. Polibotánica [online]. 2014, n.38, pp.53-66. ISSN 1405-2768.

The desert scrub vegetation covers most of the arid areas in northeast Mexico. These areas are under continuous human pressure. This study addresses the plant diversity characterization in a microphyll desert scrub vegetation of the northeast Mexico. A total of 25 sampling sites of 100 m² (10 x 10 m) where established. In the sampling plots all shrubs and trees with the following characteristics: ≥ 0.5cm in diameter (d0.10), and crown diameter (dcopa) were measured. Ecological parameters as abundance (Ar), dominance (Dr), frequency (Fr), and importance values index (IVI), Margalef index (DMG), Shannon (H') and Pretzsch indexes (A) were calculated. The results shown that Gutierrezia microcephala was the most abundant species with 584 N/ha (33%), followed by Prosopis glandulosa with 368 N/ha (21%); P. glandulosa was the species that showed the highest values in dominance and frequency with presence in 19 out of 25 sampling sites, which influences the IVI values of this species (34.6%). The estimated species richness and diversity for the areas were 2.29 and 1.87 respectively.

Palavras-chave : species richness; importance values index; regeneration.

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