The storage of inorganic carbon in estuarine wetlands is of great significance for mitigating global warming. The Dagu River estuary and Yanghe River estuary of Jiaozhou Bay were selected as sampling areas, and data analysis was carried out by Duncan method to explore the distribution characteristics and influencing factors of soil inorganic carbon (SIC) reserves. The results showed that increasing distance from the estuary led to higher reserves in the mudflat along the coastal zone. The scouring action of seawater bodies was the main factor driving this distribution. In the vertical section, the SIC reserves in 40–60 cm depth were relatively high, accounting for 34.11％ of the 0–60 cm soil depth, and resulting from the transport of water and salt in seawater. In the river flat along the vertical coastal zone, the SIC reserves first decreased and then increased with increasing distance from the sea, and the SIC reserves in 0–20 cm depth were relatively high in the vertical section, accounting for 38.18％ of the 0–60 cm soil depth. These reserves were affected by synergetic factors such as oceanic factors and anthropogenic activities. The invasion of Spartina alterniflora decreased the SIC reserves of wetlands, mainly due to its root transformation and the differences of growth characteristics and years being the main reasons for the observed decreases. Aquaculture activities changed the physical and chemical properties of the soil in aquaculture ponds, and consequently changed the distribution of SIC reserves.%河口湿地无机碳的储存对于缓解全球气候变暖具有重要意义.本文选择胶州湾大沽河口与洋河河口为采样区,应用Duncan方法进行数据分析,探讨了土壤无机碳(soil inorganic carbon,SIC)储量的分布特征及其影响因素.结果表明,距入海口越远,平行海岸带的光滩SIC储量越高,海洋潮汐的冲刷作用是主要驱动因素;在垂直剖面上,40–60 cm土层SIC储量相对较高,占0–60 cm土层的34.11％,这是海水淋溶作用水盐运移的结果.垂直海岸带的河漫滩SIC储量随距海距离的增加呈现出先降低后升高的趋势,在垂直剖面上,0–20 cm土层SIC储量相对较高,占0–60 cm土层的38.18％,这主要归因于海洋因素和人类活动等综合因素的影响.互花米草的入侵降低了湿地的SIC储量,植物根系的转化作用与自身生长特性和年限的差异是导致SIC储量低值的主要原因.养殖活动改变了养殖池塘土壤的理化性质,进而改变了SIC储量的分布规律.
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