Abstract
Aim of study: Harvesting proposals (e.g. variable retention) for Nothofagus pumilio forests are based on canopy opening, to increase recruitment and enhance seedling growth, by modifying light and soil moisture. Seed production and seedling recruitment will define the success of harvesting, where remnant forest structure are the main influence factors, as well as biotic and abiotic factors. The objective was to analyse seed production, seedling recruitment and recruitment efficiency in primary and harvested forests through variable retention along the first 10 years after harvesting, as well as the influence of regional climate.Area of study: The study were conducted in a pure Nothofagus pumilio forest located in centralTierra del Fuego (54º18’ S, 67º49’ W), where harvested stands with variable retention and unmanaged forests were sampled in long-term permanent plots.Material and methods: Data of forest regeneration plots were used (n=72) (2007 a 2014), and forest structure and seed production (2006 a 2013) were also measured. Regional climate was characterised for these years from satellite images (Sea Surface Temperature) and climate re-analysis models (rainfall and temperature of land surface).Main results: Harvesting modified forest structure; however, aggregated retention maintained some characteristics of the primary unmanaged forests. These changes influenced seed production and recruitment. Seed production and recruitment were related to crown cover and the amount of seed production; however, recruitment efficiency was not affected by harvesting. The studied variables significantly changed along the years after harvesting. Seed production and recruitment were also related to regional climate factors, where it was possible to explain their variations through temperature (e.g. summer temperature) and rainfall (e.g. winter rainfall) for the different retention types in harvested forests and the primary forests.Research highlights: Variable retention harvesting generated different micro-conditions that influence seed production and recruitment. These variables were related to canopy cover. However, recruitment efficiency was not affected by harvesting. Seed production and recruitment (primary forests and harvested stands) were related to regional climate factors and their variations can be explained from variables related to temperature and rainfall.Key words: regeneration; forest management; crown cover; regional climate; modelling; Tierra del Fuego.
Highlights
Nothofagus pumilio (Poepping & Endl.) Krasser forests regenerate mainly from natural seeds, and eventually from agamic propagation in some special environmental conditions, e.g. tree-line in upper mountains (González et al, 2006; Ivancich et al, 2012)
Seed production and recruitment were related to regional climate factors and their variations can be explained from variables related to temperature and rainfall
Basal area and volume was higher in primary unmanaged forests (PF), intermediate in aggregate retention (AR), and significantly lower in harvested areas (DRI and DR)
Summary
Nothofagus pumilio (Poepping & Endl.) Krasser forests regenerate mainly from natural seeds, and eventually from agamic propagation in some special environmental conditions, e.g. tree-line in upper mountains (González et al, 2006; Ivancich et al, 2012). There is a lack of seed bank in these forests because seeds quickly loose their viability (Cuevas & Arroyo, 1999). A seedling bank can be found and it survives for many years waiting for the canopy opening (Cuevas, 2000, 2002). Natural succession in timber forests is based on gap dynamics (Rebertus & Veblen, 1993), where pre- and post-recruitment regeneration increas-.
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