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Project regeneration of trees

Dynamics of the regeneration of commercial trees in the Pedemontana Jungle of Southern Yungas

In the northwest of Argentina is the southern limit of the distribution of the Andean Yungueños Forests of South America. The Pedemontana Jungle is a phytogeographic province that is located at the lowest level of the Andean Yungueños Forests. It constitutes one of the areas with the greatest specific specific wealth in Argentina. It is a center of endemisms, one of the main hot spots of diversity and one of the areas with the greatest specific wealth in Argentina, categorized by UNESCO as "Yungas Biosphere Reserve".

The Pedemontana Jungle originally had 2.1 million hectares but approximately 1.5 million hectares were transformed to other land uses. It is one of the most exploited forest systems in northwestern Argentina due to its proximity to populated centers and the high number of timber species, many of which are threatened.

Little is known about the dynamics of the regeneration of the tree species of these forests. Understanding the dynamics of regeneration is critical since these forests depend on natural regeneration to recover stands under forest use.

It is necessary to generate sufficient ecological information to develop sustainable forest management plans that will ensure long-term use and conservation of species of high timber value, and keep these forests functioning integrally. Failure to take measures urgently could result in the extinction of several tree species of high value. The objective of the project is to analyze the regeneration requirements to develop models that explain its dynamics, in order to delineate new management guidelines.

Since most species of high commercial value in the Pedemontana Jungle have low relative abundances, it is necessary to carry out work with sufficient replicas to be able to have statistically reliable conclusions. The research work is carried out in 16 sites of the Pedemontana Jungle in the provinces of Jujuy and Salta.

Because the requirements for regeneration vary among forest species, multispecific studies are necessary to base management recommendations based on knowledge of the requirements of each of the valuable species. The timber species studied are: Handroanthus impetiginosus, Myroxylon peruiferum, Amburana cearensis, Cedrela balansae, Calycophyllum multiflorum, Myracrodruon urundeuva, Phyllostilon rhamnoides, Enterolobium contortisiliquum, Handroanthus lapacho, Parapiptadenia excelsa, Jacaranda mimosifolia and Anadenanthera colubrina.

This project is carried out by Mg. Ing. María Paula Názaro, with the support of Ezequiel Cavadini, Agostina Muñoz, Florencia Jaime, Diego Molina, Alejandro Massa, Julieta Arias, Leonel Martinez, José María Acuña; and the following organizations: Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Fundación para la Conservación y Estudio de la Biodiversidad (CEBio), The Foundation Rufford and IDEA WILD.