XI WORLD FORESTRY CONGRESS Antalya, Turkey, 13 to 22 October 1997
	VOLUME 3, TOPIC 12 SUMMARIES OF VOLUNTARY PAPERS DYNAMICS OF NATURALLY REGENERATED YOUNG POPULATIONS OF PINUS ELLIOTTII ENGELM. IN THE ARGENTINE HUMID TROPICS Daniel A. Cabrelli1, Silvia Rebottaro2 and Claudio E. Winckler3 The dynamics of natural regeneration in the exotic Pinus elliottii Engelm. at the plantlet stage in northeastern Argentina are evaluated. The study concerns two distinct microenvironments: (a) natural regeneration subsequent to clear felling; and (b) natural regeneration after selective felling of the stands. A traditional-type plantation is also examined with a view to comparing performance here with the other regeneration process. Over a period of 18 months, diameter and height measurements were taken each successive quarter, mortality and recruitment also being recorded on each occasion. The most important findings are that: (a) following clear felling there was a much greater density of young plants than after selective felling (162 800 and 91 000 per hectare, respectively). Annual mortality in the case of selective felling was 88%, while after clear felling density was retained; (b) in terms of structure, no post-clear felling situation revealed greater variability in plant size (9-55cm in height) as compared with that noted after selective felling (11-31cm) and in the traditional plantation (13-35 cm); (c) the traditional plantation was characterized by a greater annual average increment in individual plants in their diameter and height while there were no significant height differences as compared with the post-clear felling situation. Post-selective felling growth was extremely limited compared with that in the other stands; (d) after clear felling there was a strong correlation between initial plant size and subsequent growth (r = 0.87). With the traditional plantation the correlation was very weak (r = 0.26); and (e) in the sub-population of residual plants the greatest size after the clear felling growth was significantly more marked than in the traditional plantation. Points (d) and (e) are likely to have silvicultural implications as regards thinning prior to the marketing stage for products from regenerated stands. Keywords: Pinus elliottii; Argentine humid tropics; natural regeneration; young plants; population dynamics. 1 Ing.Agr., MSc, Professor Adjunto C<tedra de DasonomRa (FAUBA) 2 Ing.Agr., MSc, Jefe de Trabajos Pr<cticos, C<tedra de DasonomRa (FAUBA) 3 Ing.Agr., Jefe de Trabajos Pr<cticos, C<tedra de DasonomRa (FAUBA) Avda. San Martin 4453 (1417) Buenos Aires, Argentina. Grupo de Regeneraci\n Natural de Pinos Subtropicales (GRNPS), C<tedra de DasonomRa, Facultad de AgronomRa, Universidad de Buenos Aires. E-mail: dcabrell@dascab.agro.uba.ar Previous Section Next Section   Download the Pdf file for this topic (332 K) What is a Pdf file ?   Back to Top of the page
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