Growth assessment in tropical trees: large daily diameter fluctuations and their concealment by dendrometer bands
CGSpace
View Archive InfoField | Value | |
Title |
Growth assessment in tropical trees: large daily diameter fluctuations and their concealment by dendrometer bands
|
|
Creator |
Sheil, Douglas
|
|
Subject |
stems
dipterocarpaceae growth measurement dendrometers |
|
Description |
Tree stems contract and expand as stem water is depleted and replaced. Band dendrometer studies suggest that such daily changes are small (1 cm diameter), suggesting that significant biases are possible. An exploratory study examined the pattern and magnitude of daily stem changes and whether commercial band-dendrometers were able to reveal them. A method involving multiple precision measurements on eight trees in a Bornean hill dipterocarp forest revealed daily shrinkage and expansion of girth of around 1 mm. Fluctuations were greater in bright weather. Band-dendrometers detected these changes but revealed less than a tenth of their magnitude. An analytical model for dendrometer error is presented that predicts how measurement biases can be reduced. Tropical trees can fluctuate appreciably in stem diameter over the day. These reversible changes are of sufficient magnitude to merit concern in growth studies. Influential biases seem especially likely when measurement intervals are short and involve systematic differences in timing and weather. Further study is required to gauge the more general influence of these measurement problems.
|
|
Date |
2003
2012-06-04T09:08:50Z 2012-06-04T09:08:50Z |
|
Type |
Journal Article
|
|
Identifier |
Sheil, D. 2003. Growth assessment in tropical trees: large daily diameter fluctuations and their concealment by dendrometer bands . Canadian Journal of Forest Research 33 (10) :2027-2035.
https://hdl.handle.net/10568/18794 https://www.cifor.org/knowledge/publication/1327 |
|
Language |
en
|
|
Format |
p. 2027-2035
|
|
Source |
Canadian Journal of Forest Research
|
|