The most effective driving force of water movement within a redwood tree would the the transpirtation of water from the foliage of the tree. As water transpires, or evaporates through specially designed holes in the leaves, a negative vapor pressure is created within the leaf. This negative pressure is responsible for ‘sucking’ water up from the roots through a specialized system of xylem cells.
This is the same process utilized by plants and trees the world over.
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