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对龙川江进行采样、测试及分析,发现河水有着较高的矿化度,HCO3-占河水总当量浓度的40%左右,SO42-和Ca2+浓度也相对较高,分别占阴、阳离子总量的10%和27%。通过相关分析和因子分析,得出流域内所发生的化学风化反应主要来自方解石、岩盐和镁硫酸盐风化的溶解。碳酸盐、蒸发盐和硅酸盐的风化过程对龙川江溶解质的贡献率分别占:39.3%、18.1%和12.5%,表明碳酸盐(如方解石)和蒸发盐(如镁硫酸盐)的反应是流域内最主要的化学风化过程。大气中的CO2通过参与岩石的风化过程对龙川江河流溶解质的贡献率为30.8%。龙川江水体中HCO3-约80.3%来自于碳酸盐风化过程,19.6%来自硅酸盐的风化。
After sampling, testing and analyzing Longchuanjiang River, it is found that river water has high salinity, HCO3- accounts for about 40% of the total equivalent concentration of river water, SO42- and Ca2 + concentrations are relatively high, accounting respectively for the total amounts of anion and cation 10% and 27%. Through correlation analysis and factor analysis, it is concluded that the chemical weathering reactions in the basin mainly come from the weathering dissolution of calcite, rock salt and magnesium sulfate. The contribution of carbonates, evaporites and silicates to the deposition of the Longchuanjiang dissolved matter accounted for 39.3%, 18.1% and 12.5%, respectively, suggesting that carbonates (such as calcite) and evaporites (such as magnesium sulphate) The reaction is the most important chemical weathering in the basin. The contribution of atmospheric CO2 to the dissolution of the Longchuan River reaches 30.8% through participation in the rock weathering process. Longchuanjiang HCO3-about 80.3% of the water from the carbonate weathering process, 19.6% from the weathering of silicate.