Unexpected CH4 emission from the Three Gorges Reservoir and its implications |
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| Authors: | Lin Liu Huai Chen Xingzhong Yuan Zhongli Chen Yuyuan Wu |
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| Affiliation: | aCollege of Animal Science and Technology, Sichuan Agriculture University, Ya’an 625014, China;bLaboratory for Ecological Forecasting and Global Change, College of Forestry, Northwest Agriculture and Forest University, Yanglin 712100, China;cInstitut des Sciences de l’Environnement, Université du Québec à Montréal (UQAM), 201 Président-Kennedy, Montréal, QC, Canada H2X 3Y7;dChengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;eCollege of Resources and Environment, Chongqing University, Chongqing 400030, China |
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| Abstract: | Until the end of last century, scientists began to show their concern about greenhouse gas emission from reservoirs and questioned the “green credential” of hydroelectric dams since then. Through measurements along the channel of the TGR, an unexpectedly low CH4 emission rate was recently observed from the surface of the TGR, much lower than our assumed estimate before. Moreover, the rate from the TGR is lower than that from many hydroelectric reservoirs. One possible reason for such a low emission rate is that lack of substrates supplied by decomposed vegetation limits the CH4 production in the sediment of the TGR because of vegetation clearance since 2002 before impounding, whose primary purpose is to conserve the water quality. These results indicated that TGR is not a hotspot of CH4 emission. On a broader sense, it also indicated that removal of flooded vegetation would help to decrease CH4 emission from dam reservoirs before impounding, especially in the drawdown area. |
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| Keywords: | Hydroelectric dam GHG Climate change Global warming DOC Carbon cycling Wetlands |
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