珠江马口站,河口站断面水体有机碳含量的季节变化

１９９７年７月份和１１月份对北河口站和西江马口站水体有机碳含量进行了两次采样分析。结果表明；两江水体的颗粒有机碳含量在不同 均高于溶解有机碳含量，这与全球河流以溶解有机碳为主的平均格局显著不同。溶解有机碳，颗粒有机碳含量以及总有机碳含量均不文季节的变化而变化，汛期含量高于平水期。悬浮物中有机碳的含量的随悬浮物含量的增加，也即流域土壤机械侵蚀强度的加强而降低，这种现象与全球河流的总体趋势一致。汛期水

Seasonal variations of riverine oranic carbon contents in Makou and Hekou gauge stations of the Pearl River

Water samples were collected in high water season (July, 1997) and middle water season (October, 1997) from two main lower reach gauge stations of the Pearl River, namely Hekou and Makou, respectively. Content of particulate organic carbon is always higher than that of dissolved organic carbon in both seasons, which is obviously different from the global average pattern, i.e., dissolved organic carbon is the dominate composition of the riverine transported organic carbon. The contents of dissolved and particulate organic carbon change with the water levels in a direct ratio. The percentage of organic carbon in total suspended substance changes with the content of total suspended substance in an inverse ratio. The more intense is the soil erosion in the drainage, the more concentrated is the riverine organic carbon in the river. The contribution of autochthonous organic carbon is larger in high water season than in middle water season.