Sap acts like the blood of a tree; it carries nutrients within the tree. Accordingly it requires a significant amount of pressure to move sap throughout the tree, particularly when the sap is being moved upwards. When a tree has an open crevice (a crack from a branch being cut off for example), the sap is forced in order to “heal” the wound. Deciduous pine tree tend to be more sappy, whereas the smoother bark trees tend to be less sappy. So the amount of sap released depends on the amount of sap within the tree to begin with.
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