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A dendroclimatological investigation of Phyllocladus aspleniifolius (Labill.) Hook. f.

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Allen, KJ (1998) A dendroclimatological investigation of Phyllocladus aspleniifolius (Labill.) Hook. f. PhD thesis, University of Tasmania.

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Abstract

A network of fifteen Phyllocladus aspleniifolius (Celerytop Pine)
chronologies for Tasmania, Australia, is developed. These sites effectively form
north-south and east-west transects across the state, ranging in elevation from sea
level to 850m above sea level. Crossdating is established between sites spread
across the state, indicating the existence of a common broadscale control
mechanism. The growth response to a number of climatic variables, including
maximum and minimum temperature, precipitation, zonal and meridional indices,
and the . Southern Oscillation Index is investigated. The most prominent features
of the response functions produced for these variables are a consistency across
sites in their response, especially so for northern sites, and a significant and
negative correlation with prior growing season temperatures.
High frequency variability in the quasibiennial range dominates the spectra
of ring width series and is investigated in an attempt to determine whether it
contains statistically significant climate information. Strong evidence for the
influence of a climatic factor is not apparent, although the influence of the Zonal
Index may be significant.
Maximum temperature, the variable most consistently and most strongly
correlated with ring widths, is used as the basis for climatic reconstruction on time
scales greater than 2 years. Attempts to reconstruct climate by the more
traditional technique of principal components regression were unsatisfactory, with
insufficient variance due to climate being explained. Structural time series
analysis is adapted for dendroclimatic reconstruction and some improvements in
models result.
The structural time series reconstructions show some differences between
different regions of the state over the twentieth century which apparently did not
exist in the previous century. While these reconstructions approximately trace the
trend of increasing temperatures indicated by high altitude Lagarostrobos
franklinii (Huon Pine) and instrumental records over the past century, there
remain some significant differences in reconstructions from the two species.
Different optimal temperatures for photosynthesis associated with elevational
differences of sites are consistent with these differences.
In large part, the limitations revealed through an examination of climate
response of this species, and through the development of models for climatic
reconstruction, relate to physiological questions concerning the species and point
to a need for more detailed investigation of physiological aspects of species used
for dendroclimatic work. Such investigations would allow a fuller utilisation of
the potential offered by these species, and networks of them, as well as opening
the way to a better understanding of resultant climatic reconstructions.

Item Type: Thesis (PhD)
Keywords: Phyllocladus aspleniifolius, Celerytop Pine, climatic variables, temperature, dendrochronology, autoregressive modelling, Southern Oscillation Index
Copyright Holders: The Author
Additional Information:

Thesis (Ph.D.)--University of Tasmania, 1998. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:48
Last Modified: 23 Aug 2017 05:25
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