Abstract：This study explored the distribution pattern, spatial changes and influencing factors of CO2 flux in reservoirs from a global perspective, based on 277 sets of CO2 flux emission data from 234reservoirs around the world. The study showed that CO2 fluxes in tropical reservoirs were significantly higher than in other climates, and those in French Guiana and Brazil were significantly higher than in other countries. The CO2 fluxes of global reservoirs were significantly correlated with reservoir age, latitude and primary net productivity (NPP0) (P<0.001). With the increase of age and latitude, the CO2 flux dramatically decreased exponentially, and then the decline rate slowed down. No significant correlations were observed between water temperature, chlorophyll-a (Chl-a), dissolved organic carbon (DOC), total phosphorus and CO2 fluxes in global reservoirs. The CO2 fluxes in the young reservoir were 2.16 and 3.077 times of those in the middle and old reservoirs respectively, while in low latitudes was 2.042 and 3.91 times that in middle and high latitudes. The importance of factors on CO2 fluxes in global reservoirs was in the order of latitude > reservoir age >NPP0>Chl-a >DOC. On a global scale, the importance of global indicators such as geographical location, reservoir age and NPP0were much higher than that of carbon content and eutrophication in individual reservoirs. In future hydropower development, location of new reservoirs should be considered as much as possible to minimize carbon dioxide emissions, especially in tropical regions.
欧阳常悦, 秦宇, 方鹏, 梁越. 全球水库CO2通量分布格局及影响因素分析[J]. 中国环境科学, 2023, 43(11): 5671-5677.
OUYANG Chang-yue, QIN Yu, FANG Peng, LIANG Yue. A Study on distribution pattern and influencing factors of CO2 flux in global reservoirs. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5671-5677.
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