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Get PDF (786K) - Wiley Online Library

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Get PDF (786K) - Wiley Online

Keywords Canopy cover; Herbivory; Leaf area; Relative growth rate; Specific leaf area; Stem slenderness; Tropical forest; Width length ratio. Nomenclature Ribeiro et al. (1999) Received 15 July 2010 Accepted 14 June 2011 Co-ordinating Editor: Tim O’Connor Traits and growth of liana regeneration in primary and secondary forests of Central Amazonia Mareike Roeder, Dirk Hölscher & Isolde D. Kossmann-Ferraz Roeder, M. (corresponding author, mroeder1@gwdg.de) & Hölscher, D. (dhoelsc@gwdg.de): Tropical Silviculture and Forest Ecology, Burckhardt Institute, Georg- August-Universität Göttingen, Büsgenweg 1, 37077 Göttingen, Germany Kossmann-Ferraz, I.D. (isolde.ferraz@pq.cnpq.br): Instituto Nacional de Pesquisas da Amazônia (INPA), Coordenação de Pesquisa em Silvicultura Tropical, Av. André Araújo, 2936, Aleixo, Manaus, AM, Brazil Introduction Applied Vegetation Science 15 (2012) 108–118 Lianas are an important component of tropical forests. They contribute around 25% of the stem density and diversity of woody plants in many tropical lowland forests (Schnitzer & Bongers 2002) and influence the biological dynamics of a forest in various ways. For example, lianas can suppress tree growth, decrease fecundity and increase tree mortality (e.g. Putz 1984; Laurance et al. 2001; Schnitzer & Bongers 2002; Kainer et al. 2006; Heijden & Phillips 2009), and they connect canopies, creating an inter-crown pathway for arboreal animals (Emmons & Gentry 1983; Putz 1984). Natural disturbances and anthropogenic activities have been documented to increase liana abundance in tree-fall gaps, forest borders, Abstract Question: Do traits of liana regeneration differ among secondary forest types of varying land-use history and primary forest? Location: Eighty kilometers north of Manaus, Brazil. Methods: We compared plant functional traits and growth rates of liana regeneration (o 1.7-m length) among two secondary forest types and primary forest. Secondary forest types were: Vismia (on land formerly clear-cut, used for pasture and intensively burned) and Cecropia (no pasture usage or intensive fires after clear-cut). Results: A principal components analysis indicated that most of the primary forest species exhibited a similar habit and were characterized by short shoots and small, round leaves with low specific leaf area, whereas secondary forest species had a broad range of trait values. At the plot level, primary and secondary forest communities were separated mainly by plant length and leaf size. Plant size varied more within secondary than within primary forest plots. The two secondary forest types could not be separated based on the traits of liana regeneration. Relative growth rate (RGR) did not correlate significantly with any measured plant trait, except for a negative relation to initial length. RGR increased with decreasing canopy cover and was highest in Vismia forest plots. Conclusion: Plant functional traits of liana regeneration were more similar in the primary forest and differed substantially from secondary forests, yet canopy cover only partly explained the observed differences. forest fragments and secondary forests (Schnitzer et al. 2000; Laurance et al. 2001; Letcher & Chazdon 2009). Lianas are often therefore regarded as light-demanding growth forms. Conversely, many species that persist in the understorey of old-growth forest are shade-tolerant, at least in the regeneration stage (Putz 1984; Gerwing 2004). Although lianas can easily be distinguished from other growth forms in the adult stage, the habit of seedlings and saplings ranges from tree-like, self-supporting plants to delicate, thread-like seedlings that are obligate climbers. The habit of one seedling can change with environmental cues (e.g. sudden light availability) and time. Differences in habit and seedling performance can be described by traits, which may shed light on the Applied Vegetation Science 108 Doi: 10.1111/j.1654-109X.2011.01152.x © 2011 International Association for Vegetation Science

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