Resumo

BOGINO, S. M  e  BRAVO, M. B.. Rolling impact on woody plant biodiversity and individual biomass of jarilla (Larrea divaricata) in the Dry Chaco in Argentina. Quebracho (Santiago del Estero) [online]. 2014, vol.22, n.2, pp.79-87. ISSN 1851-3026.

Rolling is a technique used in arid and semiarid areas of Argentina for controlling woody species and enhancing forage potential of the ecosystems. The objective of this work was to determine if rolling contributes to woody species control, mainly of Larrea divaricata, and the effects that this practice has on the individual biomass of this species in a site located in the southernmost area of the Dry Chaco in the province of San Luis, Argentina. The density of jarilla and of all other woody species was measured in four forest settings: two successive rolling (2R) in two different years, one rolling (R) and no-rolling (T1 and T2) and the individual biomass of jarilla was quantified. Measures were taken two years after the last rolling was performed. The results showed that the total amount of woody individuals per hectare was as follows: 6.339±596 in 2R, 6.313±426 in R, 5.275±455 in T1 and 3.251±300 in T2. The ANOVA of the absolute frequency and the indexes of Shannon-Wiener and Sorensen did not show significant differences among treatments provided that all the species were considered as a whole. Non-significant differences were recorded among treatments as to the number of individuals of jarilla either. Six out of a total of eighteen species showed significant differences among treatments. Rolling made individual biomass of jarilla decrease significantly. It can be concluded that rolling did not favor woody species control and that there was a specific response to this anthropogenic disturbance.

Palavras-chave : Management; Dry Chaco; Disturbance; San Luis.

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