Autumn leaves falling

Leaves fall from trees during autumn, a seasonal phenomenon that transforms landscapes into shades of orange and red.

About this subject

Autumn is marked by leaf fall, a process known as leaf abscission. This phenomenon occurs mainly in deciduous trees such as maples, oaks, and beeches, which shed their leaves to conserve energy during winter. The color change results from chlorophyll breakdown, revealing pigments like carotenoids and anthocyanins, which produce yellow and red hues.

In the Northern Hemisphere, autumn occurs from September to December, while in the Southern Hemisphere, from March to June. Regions like New England (USA), Hokkaido (Japan), and the Black Forest (Germany) are famous for spectacular fall foliage displays. The phenomenon attracts tourists and photographers, generating 'fall tourism'.

Culturally, leaf fall symbolizes transience and renewal in many traditions. In Japan, 'momijigari' (red leaf hunting) has been popular since the Heian period. Poems and paintings often depict this season as a time of reflection and ephemeral beauty.

Ecologically, the leaf litter enriches the soil with nutrients, sustaining fungi, insects, and microorganisms. This cycle is essential for temperate forest health. Leaf fall also reduces water loss through evapotranspiration, helping trees survive the dry winter.

Frequently Asked Questions

Why do leaves change color in autumn?

Chlorophyll breaks down due to reduced sunlight, revealing carotenoids (yellow/orange) and anthocyanins (red/purple), which are produced in response to cold.

Where are the best autumn landscapes in Brazil?

In Brazil, autumn is most noticeable in the South and Southeast regions, especially in highland cities like Campos do Jordão (SP) and Gramado (RS), with araucarias and plane trees.

What is the difference between deciduous and evergreen trees?

Deciduous trees shed all leaves in autumn/winter, while evergreens keep leaves year-round, such as pines and eucalypts.