In autumn, the earth is golden, as if it is a grand visual feast prepared by nature for us. At this time, the leaves change from emerald green to a fiery yellow, giving people a warm and tranquil feeling. So, what exactly makes the leaves such a charming color in the fall?Let's unveil the wonder of the yellowing of the leaves in autumn.
The main reason for the yellowing of leaves in autumn is related to the change of two photosynthetic pigments, chlorophyll and carotene. In summer, chlorophyll is the most important photosynthetic pigment in leaves, absorbing light energy and photosynthesizing, converting carbon dioxide and water into glucose while releasing oxygen. And with the arrival of autumn, the hours of daylight decrease, the temperature drops, the trees gradually stop photosynthesis, and the production of chlorophyll slows down.
While chlorophyll is gradually decreasing, carotene is beginning to show its prominence. Carotene is an orange-yellow pigment that has always been present in the leaves of trees, only to be masked by the green color of chlorophyll in the summer. When chlorophyll is reduced, the color of carotene is revealed, resulting in warm hues such as golden and orange leaves. This change gives autumn its characteristic colors and gives it a warm, cozy feel.
The yellowing of leaves in autumn is not only the result of photosynthetic pigment changes, but also involves a series of physiological adjustments inside the leaves. As the temperature drops, the biochemical processes in the plant gradually slow down, resulting in an accelerated rate of chlorophyll decomposition. At the same time, some organic matter is transported within the leaves and is stored in the trunk and roots, providing the necessary substances for the tree to store energy during the winter.
By adjusting their physiological activities, trees achieve a smooth transition from flourishing in summer to withering in autumn. This kind of warm beauty makes people feel the magic of nature.
During the process of yellowing the leaves, there was a time when the leaves turned golden yellow, but they did not fall. This is because the tree temporarily maintains the position of the leaves on the tree by controlling the growth of the shedding layer. During this time, the leaves sway in the wind, like a golden dance, adding a romantic and graceful color to the autumn earth.