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Xylem and phloem transport processes in trees are
classical problems in plant physiology, but still
somewhat weakly understood. The transport of water
from the soil to the leaves is especially intriguing
since it occurs under metastable conditions where
water pressure has decreased below saturation vapour
pressure. This often leads to the formation of gas
bubbles (embolisms) and disruption of xylem
transport. Embolisms have also been shown to refill
with water, but mechanisms for refilling remain
uncertain. In this book these plant physiological
problems are addressed as purely physical processes.
Also the osmotically driven translocation of sugars
in the phloem is analysed with a whole tree level
model. It is predicted that phloem transport is
tightly coupled to xylem water potential and
hindered by a rise in phloem viscosity
when phloem sap becomes highly concentrated.
classical problems in plant physiology, but still
somewhat weakly understood. The transport of water
from the soil to the leaves is especially intriguing
since it occurs under metastable conditions where
water pressure has decreased below saturation vapour
pressure. This often leads to the formation of gas
bubbles (embolisms) and disruption of xylem
transport. Embolisms have also been shown to refill
with water, but mechanisms for refilling remain
uncertain. In this book these plant physiological
problems are addressed as purely physical processes.
Also the osmotically driven translocation of sugars
in the phloem is analysed with a whole tree level
model. It is predicted that phloem transport is
tightly coupled to xylem water potential and
hindered by a rise in phloem viscosity
when phloem sap becomes highly concentrated.