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The contrasting temperature between night and day speeds up the loss of chlorophyll from leaves, leaving behind the secondary photosynthetic pigments( carotenoids) that give us the yellow and orange colors.
Found on CNN 4 years ago
The colors this year are coming about two weeks earlier than normal and will probably go by fast and furiously, largely, this is because the drought creates stress for the trees -- physiological stress. So from that standpoint, while the drought may enhance some of the colors, the stress is not a good thing and may be a harbinger of things to come with climate change.
Found on CNN 4 years ago
A mild to moderate drought may actually enhance fall foliage to some degree, so long as it didn't lead to a lot of' browning' or early leaf drop, then again, drought one year may mean less robust leaf production the next.
Found on CNN 4 years ago
Good tree growth last year allowed the trees to store up energy reserves and nutrients over the winter, resulting in robust leaf development this spring and summer, but this works the other way too... a bad drought one year can lead to poorer foliage the next.
Found on CNN 4 years ago
The causes of fall foliage are complex and actually not entirely understood, drought is only one of several factors, the others being photoperiod and the contrast between daytime and nighttime temperatures in autumn. All of this just goes to show how fascinating our forest ecosystems are !
Found on CNN 4 years ago
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