aspen leaf in autumn on the ground. leaf changing colors with green, yellow, orange, purple, red

defoliation fall anthocyanin aspen tree autumn leaves background beautiful biology botany carotenoid chlorophyll close colorful colours dried environment fallen falling foliage green leaf maple nature october orange outdoors pattern peaceful perfection purple red road season seasonal shedding tanin vibrant wallpaper warm toned yellow yellowed ground changing colors seasons pigments ground red