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以西江马口断面水体为研究对象,讨论其有机碳含量、悬浮物同位素组成(δ13C、Δ14C)与环境之间的关系。西江马口断面有机碳含量呈现季节性变化,其中颗粒有机碳(POC)含量范围介于0.13～4.98 mg/L之间,溶解有机碳(DOC)含量范围介于0.98～4.17 mg/L之间,DOC/POC比值为1.34,远低于世界多数河流之比值。近年来马口断面悬浮物POCδ13C的变化范围介于-21.3‰～-26.1‰之间,随时间出现整体性漂移现象,表明流域生态环境整体改善。POCΔ14C变化范围介于-132‰～-425‰之间,与取样期间的流域降水过程及土壤的侵蚀相关。
Taking the section of the Xikou section as a research object, the relationship between organic carbon content, isotope composition of suspended matter (δ13C, Δ14C) and environment was discussed. The content of organic carbon (POC) in the section of the Xikou section of the Xikou seasonal variation ranged from 0.13 to 4.98 mg / L, and dissolved organic carbon (DOC) ranged from 0.98 to 4.17 mg / L , DOC / POC ratio of 1.34, well below the ratio of most of the world’s rivers. In recent years, the change range of POCδ13C of suspended solids in the section of Shekou has ranged from -21.3 ‰ to -26.1 ‰, showing a global drift over time, indicating that the overall ecological environment of the basin has been improved. The range of POCΔ14C varied from -132 ‰ to -425 ‰, which was related to the precipitation process and soil erosion during the sampling period.