Long-term dynamics of the long-lived conifer Libocedrus bidwillii after a volcanic eruption 2000 years ago
2005; Wiley; Volume: 16; Issue: 3 Linguagem: Inglês
10.1658/1100-9233(2005)016[0321
ISSN1654-1103
AutoresJ. Ogden, R. A. Fordham, Mark Horrocks, Stephen Pilkington, Richard G. Serra,
Tópico(s)Geology and Paleoclimatology Research
ResumoAbstract Question: Following a volcanic eruption of ca. 232 AD, known as the Taupo eruption, the emergent conifer Libocedrus bidwillii expanded on Mt. Hauhungatahi, upwards above the current tree-line, and downwards into the mixed montane forest. We ask: (1) if current age-structures at different altitudes support the patterns predicted by the temporal stand replacement model, with cohort senescence and progressively depleting recruitment at ca. 600 year intervals (average cohort age) since the eruption: and (2) if the case history of the population sheds light on the persistence of mixed conifer-hardwood forests in general. Location: Mt. Hauhungatahi, Tongariro National Park, New Zealand. Methods: The species composition and structure of seven stands covering the altitudinal range of Libocedrus bidwillii, were quantified. Libocedrus trees were cored, and regression equations used to predict ages. Cohorts were identified. Results: Libocedrus densities and basal areas, and the abundance of seedlings and sa...
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