Why Do Deciduous Trees Lose Their Leaves In The Fall
Camila Farah
Warm spring temperatures and rainfall wake deciduous plants from their slumber and they begin to form new leaf buds.
The process is controlled by the plant hormone auxin. First the veins transporting sap into and out of the leaves slowly close down. The image above shows the leaves of a birch tree. A chemical called abscisic acid is produced where the leaf and stem comes together.
In fall temperate deciduous trees enter a period of dormancy when all metabolic processes start to slow down due primarily to the decreased daylight hours. Many types of trees shed their leaves as a strategy to survive harsh weather conditions. The life cycle of deciduous plants includes a growing season and a dormant season. How deciduous trees lose their leaves.
Leaves fall because of chemical changes that occur within the tree sap. In tropical and subtropical forests trees shed their leaves at the onset of the dry season. When it is very cold the. While evergreen plants in cold climates have thick waxes and resins to protect their leaves from freezing and fracturing deciduous species generally have thin leaves that are susceptible to cold temperatures.
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Simply trees actively shed their leaves because there s no use for them anymore. Since water expands when frozen the tender leaf cells would rupture during the winter making them useless for photosynthesis. As light levels and temperatures drop the flow of auxin to the leaves slows and levels of another hormone ethene rise. As temperatures continue to warm the leaves develop more fully and reach maturity by the time summer arrives.
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