揭秘智利阿塔卡马沙漠花海背后的科学
Every few years, the Atacama Desert in northern Chile—a place so arid that some weather stations have never recorded rain—shrugs off its dusty brown coat and explodes into a carpet of pink, yellow, and purple wildflowers. This sudden transformation, known locally as the 'desierto florido' or flowering desert, is not a miracle but a brilliantly choreographed natural event. Tourists and scientists alike rush to witness a landscape that, for a short window, rivals the most lush meadows on Earth.
Beneath the sun-scorched surface lies the secret: a vast, dormant seed bank containing over 200 species of flowering plants. These seeds can survive for decades, protected by tough coatings that prevent them from germinating until conditions are just right. The trigger is a precise sequence of rare, heavy rains—typically linked to a warmer phase of the El Niño climate pattern—that deliver at least 15 millimeters of precipitation in a single event. That might seem modest, but in a desert receiving an average of just 1 millimeter yearly, it is an overwhelming signal to break dormancy.
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