Enrichment planting in overexploited subtropical forests of the Paranaense region of Misiones, Argentina

Line enrichment experiments using native species of commercial value were established in overexploited forests in Misiones, Argentina, on public and private lands. Ten timber species were tested, as well as Euterpe edulis (palmito) which can be harvested after 10-12 years for its heart of palm. Four to 7 years after planting, the timber species with the greatest mean height and diameter at breast height (d.b.h.) were Bastardiopsis densiflora, Enterolobium contortisiliquum, Nectandra lanceolata, Ocotea puberula and Peltophorum dubium. Cordia trichotoma and Balflurodendron riedelianum, both highly appreciated timber species, could also be recommended for enrichment despite their relatively slower growth. The palm E. edulis had a low survival rate but the remaining individuals showed good height and d.b.h. Labor costs associated with establishment and care of enrichment plantings were similar to other reports for the region. The incorporation of species with a short harvest age and a high economic value such as the palm E. edulis can accelerate and increase investment returns of enrichment plantings. Though long-term results are required to document the potential for growth and quality of production for each species, results from the experiments described in this article can provide insights to the use of these species in the enrichment of overexploited and secondary forests in the region. (C) 1997 Elsevier Science B.V.