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是流域化学侵蚀过程的主要输出物质。在珠江的马口站、河口站两个断面进行了一个完整水文年(包括4个水文季节)的采样,用容量法对78组样品进行了含量分析。结果表明,珠江径流的含量在一个水文年中发生约36%的变化,汛期含量大于枯水期含量。径流含量与悬浮物含量之间存在相同的变化趋势。在同一水文季节,西江马口站断面径流含量较为均一,而北江河口站断面各采样点的含量相差较大。西江和北江流域侵蚀通量分别为1103×103mol/km2·a和1289×103mol/km2·a。影响珠江流域侵蚀通量的主要因素是流域内碳酸盐岩的出露面积和径流深度过度的土地开垦和酸雨等现代环境问题也是造成流域化学侵蚀强度增加的主要原因。
It is the main output material of chemical erosion in the basin. A complete hydrological year (including four hydrological seasons) was taken at both sections of the Pearl River’s Makou and Hekou stations, and the content of 78 samples was analyzed by the volumetric method. The results show that the runoff content of the Pearl River has changed by about 36% in one hydrological year, and the content in the flood season is larger than that in the dry season. The same trend exists between runoff and suspended matter content. In the same hydrological season, the runoff content of the cross section of the Xikou’s Meikou Station is relatively uniform, while the content of each sampling point of the Beijianghekou Station section is quite different. The erosion fluxes in the Xijiang River and Beijiang River are 1103 × 103 mol / km2 · a and 1289 × 103 mol / km2 · a, respectively. The main factors influencing the erosion flux in the Pearl River Basin are the problems of modern environmental problems, such as the exposed area of carbonate rocks in the watershed and excessive runoff, such as land reclamation and acid rain, which contribute to the increase of chemical erosion intensity in the basin.