Brown Leaf Video 2: Why exactly trees shed leaves?
Trees lose water through the pores on the leaves called Stomata.
Image courtesy: dreamstime.com
In summer, when trees need to conserve the water, what is the best strategy? Lose the leaves, right.
Fallen leaves form a protective layer over the soil. Sun light does not reach the soil directly. It helps soil retain moisture in harsh summers.
When monsoon arrives, leaves decompose and nutrients from the leaves are returned to the soil and made available for the tree again.
That is the intelligent design of nature, the cyclic design, soil-to-soil principle.