Plants vs Lighting
A new study documents how artificial light affects the seasonal rhythms of plants around U.S. cities.
Researchers from Iowa State University found that man-made lighting at night alters the natural circadian rhythms of plants, lengthening the pollen season for many of them.
They say this results in urban and suburban residents suffering from sneezing and itchy eyes for longer periods each year.
By comparing nighttime satellite images in the visible spectrum with historic plant data around 3,000 urban sites, they found that artificial light causes leaf budding in the spring about nine days earlier while also delaying the colors of fall foliage by about six days. The longer growing season could also have implications for crops grown around urban settings.
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