全球水库CO<sub>2</sub>通量分布格局及影响因素分析

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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.

Key words： global reservoir CO₂ flux influencing factors random forest algorithm

Received: 31 March 2023

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X511

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	OUYANG Chang-yue
	QIN Yu
	FANG Peng
	LIANG Yue

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OUYANG Chang-yue,QIN Yu,FANG Peng等. A Study on distribution pattern and influencing factors of CO₂ flux in global reservoirs[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5671-5677.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5671

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