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Tuesday "Noon" Seminar: Mar. 20, 2007Scott Saleska on "Does plant community composition affect carbon-cycle responses to climate change? Real-world drought puts predictions from experimental manipulations to the test"
12:30-1:45 p.m. in Biosciences West (map of building location), Room 208 |
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Talk Abstract Global climate change is predicted to increase the intensity and frequency of future drought, which in turn may be expected to induce a range of biogeochemical climate feedbacks. Here, I report on investigations of climate-carbon feedbacks which combine results from a long-term controlled ecosystem warming experiment in a Colorado Rocky Mountain meadow (the subject of my 1998 dissertation) with more recent observations during and following the widespread 2000-2004 drought. These results show that both experimental warming and real-world drought induced substantial soil carbon loss. The evidence indicates that the same mechanism, a drying-induced shift in plant community species composition and an associated decline in community productivity, provides a common explanation for the soil carbon responses to both experimental warming and drought. |
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