'We saw that microbial communities respond quite rapidly—within four or five years—to even modest levels of warming,' said an author of the study.
Scientists who studied the Alaskan tundra have warned that global warming could make microbes which live in the soil release more greenhouse gases. The permafrost soils on the northern latitude make up around 16 percent of the Earth's surface, but harbor about half of our planet's total carbon beneath its surface.
Scientists removed cores of soil from the experimental and control blocks 1.5 years after the start of the experiment, and then after 4.5 years, from depths of 15 to 25 centimeters and 45 to 55 centimeters. The former represents soil which is frozen during the winter but thaws in the warmer months between May to September, while the latter relates to the permafrost which thaws only for a brief period every year.
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