樹木核心:皮層假說
描述樹木生長的假說，隨著年輕樹木的老化，年輕的樹會成為皮層，覆在老化核心上，隨著核心發展，氮基化合物會再轉移到年輕的皮層
Core:
skin hypothesis
an
hypothesis describing the growth of trees postulating that the core
of internal tissues is overlain by a skin of external tissues
annually
CORE-SKIN
HYPOTHESIS
As
new young trees grow over older aging trees,
the
young living trees become a "skin" over the aging "core".
As
the central core develops, nitrogen-based compounds are recycled out
to the younger "skin
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