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Autumn is one of the most beautiful times of the year , where leaves turn orangish , red , or yellow and make picturesque scenery all around us . Then , before you get laid it , all of those leaves are on the ground andin our backyard , ready to be jumped in or composted . But do we really know why this happens ? Why do the leaves diminish off the trees , and do all Sir Herbert Beerbohm Tree lose their leaf ?
First , let ’s talk about the types of trees . While there are thousands of tree species throughout the human race , they are broken down into two primary categories ; deciduous and coniferous . Deciduous trees are the trees that shed their leaves . In the northerly hemisphere , this chance as the weather bring cold and day is short . In tropical and semitropic region , pass on settle as the dry conditions approaches . However , cone-bearing tree , such as an evergreen plant Sir Herbert Beerbohm Tree have weather - resistant needles that are coated in wax . It keep them from freezing instead of leaves or typically dwell in ardent climate .
simulacrum Credit : Canva
Now that we ’ve get that cover , deciduous tree shed their leaves to last cold and rough weather conditions . Each folio is connected to the tree diagram ’s circulatory system , where they change critical nutrients . To economize energy , the vein that channel food and body of water to the folio are cut off . This process happen due to a cellular change called abscission . record on to learn more !
Abscission
It is believed that the abscission process is activate by the reduction in daytime as the seasons shift key . Less sunlight for the leaves mean less chlorophyl , thus signal several chemical changes and cellular level formations that begin the process of abscission .
But , before abscission come , it is important to love that after the full growth of a leaf , it prepares itself for abscission by going through senescence . It is a natural senescence process where for plants , there is a decrease in photosynthetic and metabolic rates .
Many hormonal change occur throughout the lifetime to prepare for the foliage drop . It then causes the abscission layer to form : a separation layer and a protective level . The separation stratum weakens the walls so the leaf can easily be knocked off by wind or rain and the protection bed breed the expose area .
Marcescence
When an cutting off layer does n’t form , marcescence happens . It means the tree holds on to the browned leaves . It is typical of younger Sir Herbert Beerbohm Tree or the scurvy limbs of more mature trees . you may see this happen on oak tree , American beech , hornbeam , and witch hazel tree , to name a few .
There are a few reasons for marcescence to pass off . The abscission layer do n’t form due to warm autumn temporary or , perhaps , foliage hold back to send packing until fountain to render a layer ofmulcharound the tree that economize its dirt wet , thus giving more nutrient for growth . It is also believed that some tree keep the leaves to deter cervid .
In Summary
consider it or not , humans and tree divvy up many unique characteristic . Not only do we stand upright and have limbs , but we are all relational beings , intend we rely on other organisms to grow , reproduce , and survive . We are even made up of different hormones , cells , and systems that all act upon together .
When it follow to the dip in temperature , we pack on layer to combat the dusty , while tree diagram exuviate their organs to conserve energy and nutrients . as luck would have it , those beautiful tree leaves regrow in the spring and summer months , where they then do the whole cognitive process all over again .
