• 关键词：碳氮比  河流碳通量  颗粒有机碳  土壤侵蚀  自源有机碳  季风湿热流域

• 基金项目：国家自然科学基金(40143012);广东省自然科学基金(031548)资助项目

• 陶贞
• 1. 中国科学院广州地球化学研究所 510640; 2. 中山大学地理科学学院, 广州 510275

• 高全洲
• 中山大学地理科学学院, 广州 510275;

• 姚冠荣
• 中山大学地理科学学院, 广州 510275;

• 沈承德
• 中国科学院广州地球化学研究所 510640

• 邬俏钧
• 中山大学地理科学学院, 广州 510275;

• 吴志才
• 中山大学地理科学学院, 广州 510275;

• 刘冠超
• 广东省水文局麒麟咀水文站, 增城 511300

• 摘要：对华南增江径流进行了1个水文年度的15次等时段采样, 分析了河流悬移质中主要生源元素(C、N、H)的含量, 并估算了不同物源的贡献.结果表明, 增江悬移质中的有机碳以水生藻类的贡献为主, 土壤侵蚀来源的有机碳在悬移质粗粒组中的份额平均为37.24%, 在细粒组中仅占11.11%增江流域颗粒有机碳的输出通量为0.83×10⁶g·km^-2·a^-1, 其中来自土壤的颗粒有机碳通量为0.22×10⁶g·km^-2·a^-1.

• Abstract：The transfer of carbon from land to sea via rivers represents a major link in the global carbon cycle. The Zengjiang River drainage, a second-classed tributary of the Zhujiang (Pearl) River drainage, lies in the subtropical monsoon area, southern China, with the Tropic of Cancer through it. Suspended sediments had been collected for four weeks from the Zengjiang River and represent for a whole hydrological year. The main biogenic elements, including carbon, nitrogen and hydrogen were analyzed, and two major potential contributions from soil organic matter and aquatic algae were estimated. The research results indicated that the organic carbon in the suspended sediments originates mainly from primary production, and that from the soil organic carbon represented only 37.24% for the coarse sediments and even less 11.11% for the fine sediments. The transported particulate organic carbon flux in the Zengjiang River drainage amounts to 0.83×10⁶μg·km^-2·a^-1, in which that comes from soil erosion processes is 0.22×10⁶μg·km^-2·a^-1.

• Key words：C/N  carbon flux  particulate organic carbon  soil erosion  autochthonous organic carbon  monsoon humid tropical drainage

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