中文摘要：

自然地存在的稳定的碳和氮同位素在沉积有机物来源的学习是重要的。在 Sanggou 识别沉积有机物的来源海湾和它的邻近的区域，被高密度的贝壳和海草水产业描绘，谷物尺寸，器官的碳( OC )，全部的氮( TN )，碳和氮同位素的作文(<啜class=“ a-plus-plus ”> 13 C 并且<啜class=“ a-plus-plus ”> 15 N )在表面的有机物，沉积被决定。结果证明在 8 月，沉积 OC 和 TN 分别地从 0.17% ～ 0.76% 和 0.04% ～ 0.14%。在 11 月， OC 和 TN 分别地从 0.23% ～ 0.87% 和 0.05% ～ 0.14%。在 OC 和 TN 之间有重要积极关联(R=0.98， P < 0.0001 ) ，显示 OC 和 TN 是相应的。在 8 月， < 啜 class= “ a-plus-plus ” > 13 C 并且 < 啜 class= “ a-plus-plus ” > 15 有机物的 N 分别地从 23.06 ～ 21.59 和 5.10 ～ 6.31 变化了。在 11 月， < 啜 class= “ a-plus-plus ” > 13 C 并且 < 啜 class= “ a-plus-plus ” > 15 N 分别地从 22.87 ～ 21.34 和 5.13 ～ 7.31 。这研究发现沉积有机物的主要来源是海洋的贝壳 biodeposition，海草耕作，和土壤有机物。使用 three-end-member 混合了模型，我们估计沉积有机物的主导的来源是贝壳 biodeposition，与在 8 月的 65.53% 的平均贡献率并且 43.00% 在 11 月。因此，贝壳耕作在沿海的碳周期上有重要影响。

英文摘要：

Naturally existing stable carbon and nitrogen isotopes are important in the study of sedimentary organic matter sources. To identify the sources of sedimentary organic matter in Sanggou Bay and its adjacent areas, which is characterized by high-density shellfish and seaweed aquaculture, the grain size, organic carbon （OC）, total nitrogen （TN）, carbon and nitrogen isotopic composition （δ13C andδ15N） of organic matter in the surface sediment were determined. The results showed that, in August, sedimentary OC and TN ranged from 0.17% to 0.76% and 0.04% to 0.14%, respectively. In November, OC and TN ranged from 0.23% to 0.87% and 0.05% to 0.14%, respectively. There was a significant positive correlation between OC and TN （R=0.98, P＆lt;0.0001）, indicating that OC and TN were homologous. In August, theδ13C andδ15N of organic matter varied from -23.06‰ to -21.59‰ and 5.10‰ to 6.31‰, respectively. In November,δ13C andδ15N ranged from -22.87‰ to -21.34‰ and 5.13‰ to 7.31‰, respectively. This study found that the major sources of sedimentary organic matter were marine shellfish biodeposition, seaweed farming, and soil organic matter. Using a three-end-member mixed model, we estimated that the dominant source of sedimentary organic matter was shellfish biodeposition, with an average contribution rate of 65.53% in August and 43.00% in November. Thus, shellfish farming had a significant influence on the coastal carbon cycle.