What Determines Fall Foliage Color

What Determines Fall Foliage Color October 21 2023 at 6 45 a m Winter will be here soon enough but enjoy those gorgeous fall leaf colors before any snowflakes arrive Reach back and recall your grade school days and the simple

The U S Forest Service lists the length of night leaf pigments and weather as the three biggest contributors to the fall colors The days get shorter and the nights become longer during the fall The anthocyanin mixes with carotenoids in the leaves to give it the bright red flare Ultimately the fall color show is dependent on the weather Changeable conditions make for lousy color shows

What Determines Fall Foliage Color

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Although much is known about the physiology and biochemistry of foliage color change the adaptive value remains a mystery Scientific interest in the evolutionary advantage of leaf color change has recently focused on the photoprotection hypothesis which posits that the development of red pigments protects plants against the harmful effects of light at low temperatures and thereby allows the

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What Determines Fall Foliage Color

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Factors Influencing Autumn Leaf Color Harvard Forest

https://harvardforest.fas.harvard.edu/leaves/factors
The right weather during the autumn can promote more intense color production The reds anthocyanins which require sunlight for production are enhanced by cold and sunny days Rainy and windy weather during the autumn can knock leaves down prematurely thereby shortening the color display at its peak The timing of many individual species

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Fall Foliage 101 Why Some Autumns are More Colorful

https://www.gardenista.com/posts/fall-foliage-101-why-some-autumns-are-more-colorful/
Because the orange pigments are constant their showiness in the fall is predictable But the red pigments anthocyanins are created in the autumn in response to light plant chemical changes temperature and water supply This is where weather affects the brilliance of the fall color display Above Zelkova trees in New York City

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How Weather Affects Fall Colors ThoughtCo

https://www.thoughtco.com/how-weather-affects-fall-colors-3443701
Gusty winds and hard rains can cause leaves to fall before their full color potential is reached The conditions that make for spectacular autumn color displays are a moist growing season followed by a dry autumn with warm sunny days and cool but not freezing nights Fall weather doesn t cause leaves to change color but it does determine

What Determines Fall Foliage
Autumn leaf color Wikipedia

https://en.wikipedia.org/wiki/Autumn_leaf_color
Japanese maple autumn leaves Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on during a few weeks in the autumn season various shades of yellow orange red purple and brown The phenomenon is commonly called autumn colours or autumn foliage in British English and fall colors fall foliage or simply foliage

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Fall Foliage Explained Why leaves change color in the fall

https://www.rochesterfirst.com/weather/weather-glossary/fall-foliage-explained-why-leaves-change-color-in-the-fall/
The color change we see ultimately occurs due to the chemical processes that happen when less chlorophyll is produced by the leaves causing their colors to change in appearance as the sunlight reflects off of them When chlorophyll breaks down the leaves begin to absorb more green wavelengths of light and reflect other colors such as brown


Fall colors Here s the science behind the reds golds and oranges Yellow gold and orange leaves are fairly consistent from year to year due to other pigments specifically carotenoid that Temperature affects the rate of chemical reactions including those in leaves so it plays a part in leaf color However it s mainly light levels that are responsible for fall foliage colors Sunny autumn days are needed for the brightest color displays since anthocyanins require light Overcast days will lead to more yellows and browns

During the fall as the stems of maple leaves shut off from a tree s branches leftover glucose trapped in the leaves is used to increase the level of anthocyanin Chilly nights that stay above freezing promote anthocyanin production For many years researchers have wondered why a tree would expend energy to make anthocyanin in its leaves

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