LS1_LECTURE_21

renowned for their species diversity the diversity

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Unformatted text preview: growth, leading to extremely high aboveground biomass. !  Renowned for their species diversity. The diversity of plant sizes and growth forms produces extraordinary 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 generally lowe...
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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.

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