Mangrove is one of the most carbon-rich ecosystems in the world. Nevertheless, the understanding of organic carbon partitioning between dissolution and particle in the processes of mangrove outwelling is rather limited, flood–ebb samplings were conducted in January 2021 with 8 sampling sites covering the upper tidal boundary to the mouth in the Zhangjiang Estuary. Water samples were collected to analyze physicochemical properties, dissolved organic carbon (DOC) and particulate organic carbon (POC) contents, and their phase portioning were investigated to analyze the spatial variation between the two phases (dissolve and particle), and their influencing factors. The results showed: (1) DOC was the dominant content with the wide range of 0.48–3.29 mg·L⁻¹, accounting for 77.6% on average; while POC contents were 0.17–1.86 mg·L⁻¹, accounting for 22.4% on average. (2) Silt was dominant component in estuarine suspended sediment, accounting for 68.0% on average; clay accounted for 17.5% of the suspend sediment, and was mainly located in mangrove forest area; sand proportion was the lowest. (3) Both the closed Beijiang sluice and ponds effluents could significantly increase the water organic carbon content, but only ponds effluents changed the phase distribution of organic carbon. In natural processes, a significant positive correlation between particulate and dissolved organic carbon and dissolved oxygen (DO) in the upper estuary (r > 0.9), and a significant negative correlation between particulate and dissolved organic carbon and salinity in the lower estuary (r < −0.7) were observed. The study indicated that DOC was the dominant content, the phase partition coefficients were significantly increased due to the DOC content from pond effluents. In the natural processes, the autotrophic activities by microalgae in the upper estuary and the seawater mixed dilution followed with heterotrophic activities are the important influencing factors.

红树林是世界上碳最丰富的生态系统之一。然而，对红树林涌流过程中有机碳在溶解和颗粒之间分配的认识相当有限，2021年1月进行了涨落采样，8个采样点覆盖了张江口潮上边界至河口。收集水样，分析理化性质、溶解有机碳（DOC）和颗粒有机碳（POC）含量，并研究其相分配，分析两相（溶解相和颗粒相）之间的空间变化及其影响因素。结果表明：（1）DOC含量占主导地位，变化范围较宽，为0.48～3.29 mg·L ^-1，平均含量为77.6%；POC含量为0.17～1.86 mg·L ^-1，平均占比22.4%。(2) 河口悬浮沉积物中泥沙占主导地位，平均占68.0%；粘土占悬浮沉积物的17.5%，主要分布在红树林区；砂的比例最低。(3)北江闸关闭和池塘出水均能显着增加水体有机碳含量,但只有池塘出水改变了有机碳的相态分布。自然过程中，河口上游颗粒物、溶解有机碳与溶解氧（DO）呈显着正相关（r  > 0.9），河口下游颗粒物、溶解有机碳与盐度呈显着负相关（r  <观察到-0.7）。研究表明，DOC 是主要含量，由于池塘出水中的 DOC 含量，相分配系数显着增加。在自然过程中，河口上游微藻的自养活动和海水混合稀释后的异养活动是重要的影响因素。