Picture tells the story:
Briefly, leave colour change is caused by the decrease of photosynthesis rate due to the short day time in Autumn. As a result, green pigment (chlorophyll) slowly degraded, and then anthocyanin, carotenoids compounds take place to give leaves reddish, yellowish colour.
2 comments:
Autumn looks brighter than summer? i love autumn... cooling..
hi reanaclaire, no, simply because I captured the autumn pic in sunny day :p
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