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1997年 4～ 5月 ,在长江流域采集的土壤、植物和南北支流与主流悬浮颗粒物样品 ,对其进行了有机质δ13 C分析。结果表明 ,南北支流悬浮颗粒物有机质的δ13 C值范围在 - 2 .8%～- 2 .4 % ,而主流的δ13 C值分布在 - 2 .6 4 %～ - 2 .4 5%。南北支流的输入对长江主流不同地段的δ13 C值有着一定的影响 ,并对长江流域不同物源的贡献大小进行了估算。研究显示 :南部支流中悬浮颗粒物有机质的贡献主要来自高等植物 ;北部支流中高等植物的贡献相对降低 ,富含有机质的土壤成了重要来源。
From April to May 1997, samples of soils, plants, and the main north and south tributaries and mainstream suspended particulate matter collected from the Yangtze River Basin were collected for δ13C analysis of organic matter. The results show that the δ13C values of organic matters in the suspended matter in the north and south tributaries range from -2.8% to -2.4%, while the δ13C values in the mainstream range from -2.44% to -2.45%. The input of north and south tributaries has a certain influence on the δ13C values of different locations in the mainstream of the Yangtze River, and estimates the contribution of different sources in the Yangtze River Basin. The results show that the contribution of suspended matter in the southern tributaries to organic matter is mainly from higher plants; the contribution of higher plants in the northern tributaries is relatively lower, and the soil rich in organic matter is an important source.