Major ion chemistry, chemical weathering and CO2 consumption in the Songhua River basin, Northeast China
Major ion chemistry, chemical weathering and CO2 consumption in the Songhua River basin, Northeast China
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DOI：
10.1007/s12665-014-3921-2
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发表时间：
2015-06
影响因子：
2.8
通讯作者：
Yingjie Cao;C. Tang;Xianfang Song;Changming Liu
中科院分区：
文献类型：
--
作者：
Yingjie Cao;C. Tang;Xianfang Song;Changming Liu
对流域面积达 55.7 万平方公里的东北最大流域松花江流域的主要离子化学、化学风化和二氧化碳消耗进行了详细分析。本研究使用的数据集包括1962年至1984年56个水文站的主要离子浓度。松花江溶解性固体总量浓度中位数为104.8 mg/L，比全球平均水平（65.0 mg/L）高约两倍，但低于中国其他河流。普遍存在的离子为Na+、Ca2+和HCO3−，平均Ca2+/Na+和Mg2+/Na+摩尔比分别为0.70和0.42，接近硅酸盐风化端元。季节MK检验的长期趋势分析表明，从1962年到1984年，Ca2+、Na++ K+和HCO3−显着增加，通过线性拟合斜率计算出Ca2+、Na++ K+和HCO3−离子的增加率分别为0.22、0.63和2.35 mg/年。反演模型显示，溶解荷载主要来自岩石风化（91.5%），其中硅酸盐风化（66.4%），一小部分来自碳酸盐（16.1%）和蒸发岩（9.0%）。其他来源包括人为输入（5.3%）和大气输入（3.2%）。平均硅酸盐和碳酸盐风化速率估计为 4.03 和 1.76tkm−2year−1，硅酸盐和碳酸盐的 CO2 消耗速率分别为 17.1 × 104 和 1.85 × 104 mol km–2year−1。这些结果与研究区的岩性一致，主要由硅酸盐岩组成。
A detailed analysis of the major ion chemistry, chemical weathering and CO2consumption was conducted in the Songhua River basin, which is the largest basin with a draining area of 557 thousand km2in Northeast China. The dataset used in this study included major ion concentrations came from 56 hydrological stations from the year of 1962 to 1984. The median of the total dissolved solid concentration of the Songhua River was 104.8 mg/L, about two times higher than the global average (65.0 mg/L), but lower than that of other Chinese Rivers. Prevalent ions were Na+, Ca2+and HCO3−, and the average Ca2+/Na+and Mg2+/Na+molar ratios were 0.70 and 0.42, which were close to silicate weathering end-member. Long-term trend analysis by seasonal MK test showed that from 1962 to 1984, Ca2+, Na++ K+and HCO3−were significantly increasing, and the increasing rates calculated by linear fit slopes for Ca2+, Na++ K+and HCO3−ions were 0.22, 0.63 and 2.35 mg/year, respectively. An inverse model showed that the dissolved loads primarily came from rock weathering (91.5 %), including silicate weathering (66.4 %) and a small portion from carbonates (16.1 %) and evaporites (9.0 %). Other origins consisted of anthropogenic inputs (5.3 %) and atmospheric inputs (3.2 %). Average silicate and carbonate weathering rates were estimated as 4.03 and 1.76tkm−2year−1, and CO2consumption rates of silicates and carbonates were 17.1 × 104 and 1.85 × 104 mol km–2year−1, respectively. These results are consistent with the lithologies of the study area, which mainly consisted of silicate rocks.