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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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赣江上游河流水化学的影响因素及DIC来源
DOI: 10.11821/xb200707009, PP. 764-775
Keywords: 赣江上游,水化学,溶解无机碳,δ13C
Abstract:
对赣江上游38处水体采样点的水化学特征和溶解无机碳稳定同位素的分析,发现其总溶解质浓度较低,其中,阳离子以Na+、Ca2+为主,阴离子以Cl-和HCO3-为主,Si的浓度较高,表征了典型硅酸盐地区河流的水化学组成特征。通过海盐校正分析得出,研究区大气降水对河水溶解质的贡献率为11.5%,扣除降水的贡献部分,利用主成分分析的方法,计算得出赣南流域受硅酸盐岩风化作用强烈,同时由于受附近盐矿的影响,蒸发盐岩的风化作用显著。另外,根据δ13C溶解无机碳DIC的测量值约为-8.35‰~-13.74‰,平均为-11.65‰,利用质量平衡计算得出,研究区DIC的主要来源,约68.5%来自于土壤CO2,31.5%来自于碳酸盐矿物的溶解,进而得出流域岩石化学风化过程消耗的土壤CO2为2.11×105mol/yr·km2,来自碳酸盐本身的HCO3-含量为9.6×104mol/yr·km2。由于地理位置和流域环境以及人为因素的差异,各支流DIC来源的比例亦有所差异。
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