Extreme weather events occur frequently under global warming scenarios and have an important impact on the global carbon cycle. Compared to large rivers, small rivers are more sensitive to extreme weather events (such as typhoons). This paper reports the results of a study carried out in the Quanzhou Bay to explore the evolution of small river estuarine sedimentary organic matter after typhoon process using measurements of the grain-size, total organic carbon (TOC), total nitrogen (TN) and δ¹³C of surface sediment samples collected 2–3 days and a month, respectively, after typhoon Matmo landing in 2014. The results show that the contents of TOC and TN in the sediments, which gradually decrease from the estuary to the outer sea of Quanzhou Bay, decreased approximately 13% and 16%, respectively, a month later compared with 2–3 days after typhoon landing. The significant decrease occurred in the Jinjiang River estuary and along the South Channel of Quanzhou Bay, while the North Channel and Luoyangjiang River estuary retained high levels of TOC and TN. The results of δ¹³C values and TOC/TN ratios show that the organic matter in the sediment of the Quanzhou Bay was a mixture derived from C₃ terrestrial plants and marine algae. The terrestrial organic matter was mainly deposited in the Jinjiang River estuary 2–3 days after typhoon landing and then spread along the tidal channel to the outer sea a month later. It indicates that the hydrodynamic forces stirred sedimentary organic matters that were input and settled during typhoon, and transported later along the North and South Channel to the outer sea. Some of those organic matters were accumulated in the North Channel during the transport process. The results provide significant meaning for the carbon cycle and material flux study on the coastal and margin seas.

在全球变暖的情况下，极端天气事件频繁发生，并且对全球碳循环具有重要影响。与大河流相比，小河流对极端天气事件（例如台风）更敏感。本文报道了在泉州湾进行的一项研究结果，该研究通过测量粒度，总有机碳（TOC），总氮（TN）和δ来探索台风过程后小河口沉积有机物的演变。¹³2014年台风马特莫登陆后，表层沉积物样品C分别采集了2-3天和一个月。结果表明，沉积物中TOC和TN的含量，从河口到泉州湾外海逐渐减少与台风降落后的2-3天相比，一个月后的，分别下降了约13％和16％。晋江河口和泉州湾南航道沿岸显着减少，而北航道和洛阳江河口则保持较高的TOC和TN水平。δ的结果¹³ C值和TOC / TN比表明，在泉州湾沉积物有机物衍生自C的混合物₃陆生植物和海藻。陆上有机质主要在台风登陆后2-3天沉积在晋江河口，然后在一个月后沿潮汐通道扩散到外海。这表明，水动力搅动了台风期间输入并沉降的沉积有机物，并随后沿南北海峡运输到外海。在运输过程中，其中一些有机物积聚在北海峡。研究结果对沿海和边缘海的碳循环和物质通量研究具有重要意义。