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基于对粤东五华河干流和支流水体的物理、化学组成测试数据,应用质量平衡法和相关分析法探讨湿热山地丘陵地区岩石化学风化过程对大气CO2的吸收.结果表明:五华河水体的总溶解性固体含量(77.11 mg/L)接近于世界河流的平均值(65 mg/L);离子组成以Ca2+、Na+和HCO3-为主,可溶性Si次之.五华河流域化学径流组成主要源自硅酸盐矿物化学风化过程的贡献,碳酸盐矿物的贡献较少;大气和土壤CO2是流域内岩石化学风化的主要侵蚀介质.与同一气候带其他河流相比较,五华河流域岩石化学风化过程对大气CO2的吸收通量(2.14×105mol/(km2.a))较低,这主要是由于流域内缺乏碳酸盐岩所导致.
Based on the data of physical and chemical composition of Wuhua River and tributary waters in eastern Guangdong, the atmospheric CO2 absorption by petrochemical weathering in the hot and humid mountainous hilly region was studied by mass balance method and correlation analysis. The results showed that: The total dissolved solids content (77.11 mg / L) was close to the average value of the world’s rivers (65 mg / L); the ion composition was dominated by Ca2 +, Na + and HCO3-, followed by soluble Si. The contribution of silicate minerals to the chemical weathering process is less than that of carbonate minerals, and the atmospheric and soil CO2 are the major erosion media of petrochemical weathering in the basin.Compared with other rivers in the same climatic zone, The chemical flux from the chemical weathering to atmospheric CO2 (2.14 × 10 5 mol / (km 2 .a)) is lower, mainly due to the lack of carbonate in the basin.