Summary
A huge amount of CO 2 emissions from the drained drawdown areas of reservoirs overturns the previous results in carbon budget. Three Gorges Reservoir (TGR) has a large drawdown area, which accounts for nearly one third of the total area of the TGR. However, the total CO 2 emissions from the TGR drawdown area have seldom been estimated by far. To demonstrate the contribution of CO 2 emissions from the TGR drawdown areas, the study measured CO 2 emissions from the downstream part of the TGR drawdown areas by the chamber method, and synthesized CO 2 emissions from the other parts of TGR drawdown areas. Both the diel and seasonal variation indicated that CO 2 emission fluxes were significantly higher in the drained season than in the flooded season. The average CO 2 emission flux in the draine
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