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Defoliation as a Means of Assessing Browsing Tolerance in Southern Rata (Metrosideros umbellata Cav.)

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Title:Defoliation as a Means of Assessing Browsing Tolerance in Southern Rata (Metrosideros umbellata Cav.)
Authors:Payton, I.J.
Date Issued:Oct 1983
Publisher:University of Hawai'i Press
Citation:Payton IJ. 1983. Defoliation as a means of assessing browsing tolerance in southern rata (Metrosideros umbellata Cav.). Pac Sci 37(4): 443-452.
Abstract:Old and young trees of southern rata (Metrosideros umbel/ata)
were artificially defoliated to examine their response to foliage loss. Partial
(50%) or total defoliation before budbreak depressed shoot growth more
markedly in old than in young trees. Fifty percent leaf loss shortly after budbreak
or at the end of the growing season did not significantly impair shoot
growth in either age class. By contrast, total postbudbreak defoliation resulted
in the death of most shoots in both old and young trees. While the terminal
buds of both old and young trees totally defoliated in late autumn showed good
overwinter survival, only in the young trees were there sufficient energy reserves
to enable some of these shoots to flush the following season. Young trees
proved to be more resilient to foliage loss, suggesting a more positive carbon
balance (energy surplus) in young trees than in older trees.
Appears in Collections: Pacific Science Volume 37, Number 4, 1983

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