close-up shot of a maple leaf on the ground in autumn. maple leaf changing colours from green to yellow, orange, red and brown

defoliation fall anthocyanin autumn beautiful big biology botany carotenoid changing colours chlorophyll closeup colorful dried environment fallen flora foliage grass green ground leaf maple nature october orange outdoors pattern perfection red season seasonal shedding sign symbol tanin tree vibrant warm yellow yellowed close-up shot autumn brown brown pigments