【摘要】 为探究白洋淀溶解无机碳（DIC）分布情况与影响因素，分别于丰水期（7月）和枯水期（12月）对其上覆水进行采样分析，探究DIC时空变化以及主要影响因素。结果表明：白洋淀水体DIC质量浓度为181.75～336.26mg·L-1，季节差异显著，受丰水期降雨增多和补水增加的稀释作用影响，表现为枯水期质量浓度高于丰水期。在空间上，丰水期DIC质量浓度受光合作用、人类活动、径流冲刷、稀释作用等多重影响，呈现由北向南增高趋势；枯水期DIC质量浓度呈现北高南低趋势，枯水期南部淀区由于引黄入淀和唐河补水减少，径流冲刷减少，水岩作用减弱，进入水体的CO₂含量减少，DIC质量浓度降低，北部淀区由于水生生物矿化腐解以及补水闸口的存在，从而促进有机质矿化，导致DIC质量浓度升高。白洋淀DIC质量浓度主要受光合呼吸作用、岩石风化和人类活动耦合作用影响，在丰水期间DIC含量受光合呼吸作用、碳酸盐和硅酸盐风化、人类活动、水气界面CO₂影响，人类活动造成的外源酸对风化的影响较弱；枯水期DIC含量受光合呼吸、碳酸盐风化、人类活动综合影响。以上研究成果对了解浅水湖泊在全球气候变化和碳循环上的重要意义提供支撑，为探究湖泊CO₂的源汇、湖泊碳储存和寻找“丢失碳汇”提供重要参考。更多还原

【Abstract】 To investigate the distribution and influencing factors of dissolved inorganic carbon（DIC） in Baiyangdian Lake, overlying water samples were collected and analyzed during both the wet season（July） and dry season（December）. The results showed that DIC concentration in Baiyangdian Lake was 181.75～336.26mg·L-1 with significant seasonal differences. The increased rainfall and water replenishment during the wet season resulted in higher mass concentrations during dry season. Spatially, during the wet season, DIC concentration was influenced by multi-factors such as photosynthesis, human activities, runoff, and dilution, and presented an increasing trend from north to south. Conversely, during the dry season, DIC concentration exhibited a decreasing trend from north to south. Reduced water replenishment from the Yellow River and Tang River in the southern part of Baiyangdian Lake led to decreasing runoff, weakening water-rock interactions and reducing CO₂ input, thereby lowering DIC concentrations. In the northern region of Baiyangdian Lake,mineralization of organic matter due to aquatic biota and the presence of water replenishment gates promoted the increase of DIC concentration. DIC concentration in Baiyangdian Lake is primarily influenced by the coupling effects of photosynthesis and respiration, rock weathering, and human activities. During the wet season, DIC content is influenced by photosynthesis and respiration, carbonate and silicate weathering, and CO₂ from the water-air interface, while anthropogenic acidification has relatively weaker impacts on weathering. During the dry season, DIC content is influenced by a combination of photosynthesis, respiration, carbonate weathering,and human activities. The study findings provide important insights into the role of shallow lakes in global climate change and carbon cycling, and provide valuable references for investigating CO₂ sources and sinks in lakes, carbon storage in lakes and identifying "missing carbon sinks".更多还原