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 Understory (or understorey)

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jukido



Posts : 93
Join date : 2011-07-09

PostSubject: Understory (or understorey)   Sun Jul 31, 2011 8:03 am

Understory (or understorey) is the term for the area of a forest which grows at the lowest height level below the forest canopy. Plants in the understory consist of a mixture of seedlings and saplings of canopy trees together with understory shrubs and herbs. Young canopy trees often persist as suppressed juveniles for decades while they wait for an opening in the forest overstory which will enable their growth into the canopy. On the other hand, understory shrubs are able to complete their life cycle in the shade of the forest canopy. Also some small trees such as dogwood and holly rarely grow tall and are generally understory trees.

Forest understories have lower light intensities than at the canopy top. The wavelengths of light that are available are only a subset of those that are available in full sunlight. Understory plants must thus often be shade tolerant—they must be able to photosynthesize successfully with the limited amount of light that is available. They are often able to use wavelengths not available to canopy trees. In temperate deciduous forests understory seedlings "leaf out" before the canopy trees do. This is important because it allows the understory plants a window in which to photosynthesize without the canopy present. This brief period (usually 1–2 weeks) is often a crucial period which allows the plant to maintain a net positive carbon balance over the course of the year.

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