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Berkeley Lab scientists take soil samples at Blodgett Forest (Credit: Roy Kaltschmidt/Berkeley Lab) A new study led by Berkeley Lab has provided the first physical evidence that warmer temperatures lead to a significant drop in the stored carbon stock in deep forest soils. An experiment in California’s Sierra Nevada forest found that the carbon content in subsoils dropped 33% over five years. The research team, led by Margaret Torn, artificially heated plots of soil down to 1 meter deep by 4 degrees Celsius, which is the amount of heating projected by century’s end in a business-as-usual climate scenario. (The heating followed natural diurnal and seasonal cycles.) “We heated the whole soil profile, whereas most experiments just heat the surface,” Torn said. “That deeper soil has a very large stock of carbon and because it’s old people have assumed that it’s also stable. But we’re saying, nope, actually, you can lose this deep, older carbon.”

United statesJennifer soongRoy kaltschmidt berkeley labBerkeley labBlodgett forestSierra nevadaMargaret tornScience advancesஒன்றுபட்டது மாநிலங்களில்ஜெனிபர் சூங்பெர்க்லி ஆய்வகம்ப்லோட்ஜெட்ட் காடுசியரா நெவாடாமார்கரெட் கிழிந்தது