Understanding the causes determining the radial
pattern of sap flux density is important both for improving
knowledge of sapwood functioning and for up-scaling sap flow
measurements to canopy transpiration and ecosystem water
use. To investigate the anatomical connection between whorls
and annual sapwood rings, pruning-induced variation in the radial
pattern of sap flux density was monitored with Granier
probes in a 35-year-old Picea abies (L.) Karst tree that was
pruned from the crown bottom up. Modifications in the radial
pattern of sap flux density were quantified by a shape index
(SI), which varies with the relative contribution of the outer and
inner sapwood to tree transpiration. The SI progressively diminished
during bottom up pruning, indicating a significant reduction
in sap flow contribution of the inner sapwood. Results
suggest that the radial pattern of sap flux density depends
mainly on the vertical distribution of foliage in the crown, with
lower shaded branches hydraulically connected with inner
sapwood and upper branches connected with the outer rings.
CESCATTI Alessandro;
FIORA Alessandro;
2010-01-27
HERON PUBLISHING
JRC50006
0829-318X,
http://heronpublishing.com,
https://publications.jrc.ec.europa.eu/repository/handle/JRC50006,
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