Water chemistry of the Zhujiang (Pearl River): Natural processes and anthropogenic influences
Water chemistry of the Zhujiang (Pearl River): Natural processes and anthropogenic influences
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DOI：
10.1029/2006jf000493
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发表时间：
2007-03
影响因子：
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通讯作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Huiguo Sun;Jingtai Han
中科院分区：
文献类型：
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作者：
Shurong Zhang;Xixi Lu;D. Higgitt;C. Chen;Huiguo Sun;Jingtai Han
[1]利用珠江75个水文站1958-2002年主要溶解态离子（Ca 2+、Mg 2+、Na+和K+之和、HCO 3-、SO 42-、Cl-）和溶解态SiO2的长期水化学资料，分析了珠江主要溶解态离子的时空变化特征。珠江流域内总溶解固体（TDS）的变化范围为34.0 ~ 416.1mg/l，总体上沿珠江干流沿着由上而下递减。岩石风化作用是珠江水化学的主要控制因素，碳酸盐风化作用、硅酸盐风化作用和蒸发岩风化作用分别占珠江水化学的68%（22-92%）、22%（2-68%）和10%（3-24%）。通量计算表明，在1958-2002年期间，平均每年约有41.8 × 106吨TDS被运出珠江（不包括三角洲地区）。从长期趋势分析中可以观察到水化学的变化，特别是SO 42 −和Cl−，这是人为影响的结果，如酸沉降、生活和工业废水排放以及流域水资源开发。珠江流域强有力的重新造林政策加上水库的快速开发，将在未来对水化学产生更重大的人为影响。
[1] The temporal and spatial variations of major ions in the Zhujiang (Pearl River) were analyzed using long-term water chemistry data of major dissolved ions (Ca2+, Mg2+, the sum of Na+ and K+, HCO3−, SO42−, Cl−) and dissolved silica (SiO2) from 75 hydrological stations (1958–2002). The total dissolved solids (TDS) within the Zhujiang basin varies from 34.0 mg/l to 416.1 mg/l generally decreasing from upstream to downstream along the main stem of the Zhujiang. Rock weathering is the dominant controlling factor for the water chemistry of the Zhujiang, and more specifically, on average, 68% (22–92%) of total dissolved load comes from carbonate weathering, 22% (2–68%) from silicate weathering, and 10% (3–24%) from evaporite weathering, respectively. The flux calculations indicate that in total about 41.8 × 106 tonnes/year of TDS are transported out of the Zhujiang (excluding the Delta Region), averaged for the period 1958–2002. Changes in water chemistry can be observed from long-term trend analysis, notably for SO42− and Cl−, as a result of anthropogenic influences, such as acid deposition, domestic and industrial wastewater discharge, and basin water resource development. An intense reforestation policy coupled with rapid reservoir development in the Zhujiang Basin would trigger more significant anthropogenic impacts on water chemistry in the future.