Unformatted text preview: growth,
leading to extremely high
aboveground biomass. ! Renowned for their species diversity. The diversity of
plant sizes and growth forms
structural diversity. ! A tree canopy (the uppermost layers of
branches) is intermingled
with vines, epiphytes (plants
that grow entirely on other
plants), shrubs, and herbs. Subtropical Deserts
! Found at 30º N and 30º S latitudes.
! Because the scarcity of water means
conditions are rarely favorable
enough to support photosynthesis, the
productivity of desert communities is
very low. Plants are widely spaced,
perhaps because of competition for
water. ! Desert species adapt to the extreme
temperatures and aridity by growing
at a low rate year-round or by
breaking dormancy and growing
rapidly in response to any rainfall. Temperate Grasslands
! Temperate grasslands form in
temperate regions with
relatively low precipitation.
variation in precipitation and temperature ! Well-defined growing season.
! Grasses are the dominant lifeform because either conditions are
too dry to enable tree growth or
encroaching trees are burned out
by fires. ! Although the productivity is
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This note was uploaded on 12/04/2013 for the course LIFE SCIEN 1 taught by Professor Lloyd-smith during the Winter '11 term at UCLA.
- Winter '11