Weather of Arabia - Autumn in the temperate regions of the world is characterized by brightly colored foliage, which slowly fall from the trees to cover the ground and paint a colorful autumn painting on it, but why do the leaves of some plants fall in the fall?
Why do tree leaves fall in the fall?
It turns out that autumn leaf fall is a form of adaptation and self-protection, which trees resort to to protect themselves from the dangers of winter and some environmental changes, and the following are the most important reasons for falling leaves in autumn:
- Freezing: The types of plants that shed their leaves in the fall have thin leaves that are susceptible to cold temperatures, and since water expands when frozen, the cells in the thinner leaves will rupture during the winter, rendering them useless for photosynthesis.
- Unproductive appendages: As we mentioned earlier, if the leaves do not fall, they will be damaged in the winter, and then this tree will be stuck with thousands of unproductive appendages, at a time when there is no way to make food.
- Wind: The leaves of trees will also pose a threat to plant safety when faced with strong winter winds, as the force of the wind puts pressure on the broad leaves, and when the tree is cold and brittle, it is easy to break. The same goes for the weight of snow on all those leaves, which makes trees susceptible to breakage and damage.
- Regeneration: By the end of summer, many leaves have been eaten by insects, diseased, or damaged, so dropping them gives the plant a fresh start in spring, and nutrients from decaying leaves are recycled to help grow new ones.
Why don't the leaves of evergreen trees fall off?
Whereas trees with thin leaves shed their leaves to protect themselves, evergreen plants in cold climates contain wax and thick resin to protect their leaves from freezing and breaking, and evergreen leaf forms have small areas, allowing snow to fall off them. The risk of tree branches breaking is reduced.