Abstract

KEES, S.M et al. Producción y crecimiento de las plantaciones de Prosopis alba Griseb. en la provincia Chaco. RIA. Rev. investig. agropecu. [online]. 2018, vol.44, n.2, pp.113-120. ISSN 1669-2314.

At present, in Chaco province, there are about 6000 ha plantations of Prosopis alba Griseb, “algarrobo blanco”, not exceeding 30 years of age, located in different site qualities. The purposes of this work were to typify the growth in this species plantations at different ages and site qualities, and to adjust non-linear models for age-based diameter projection. A total of 40 plantations were surveyed, with ages ranging between 4 and 23 years, located in 32 settings and different site qualities, where 126 rectangular sampling plots of 1000 m² were installed. For each plot, the estimations were as follows: basal area (m².ha-1), density (pl.ha^-1), total volume (m³. ha^-1), mean normal diameter (cm), mean diameter of dominant trees (cm), mean annual increase in mean normal diameter (cm.year^-1), mean annual increase in dominant mean diameter (cm.year^-1) and site quality. In general terms, all ages present high density, particularly in the highest quality sites. The increases in mean normal diameter and mean diameter of dominant trees in the highest quality sites are greater than the general average for the sample and generally greater than 1 in cm.year^-1. The measured variables are indicative of the productive capacity of the species in the study area. It is highly recommended to correctly select the planting sites in order to achieve positive results in terms of timber production. The Logistic and Gompertz models allow us to estimate a technological shift, with diameters greater than 30 cm at 25 years of age for the best quality sites.

Keywords : Site quality; Models; Dasometric parameters.

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