摘要
依据甘肃省108条主要河流、128个监测站点近60a的水质监测资料,对全省河流按天然水化学特征的分布规律及控制因素进行研究.结果表明:甘肃河流的天然水化学分布状况可根据主要离子浓度接近、水化学类型趋同原则,划分为祁连山区、甘南高原区、黄土高原干旱区、黄土高原半湿润区和陇南湿润区5大区域;全省河流加权平均的主要离子浓度整体略高于全黄河流域均值,但明显高于全长江流域均值.主要离子中Cl-、Na+的空间变异性最大,而HCO3-、Ca2+空间变异性最小,SO42-、Mg2+居中;主导水化学特征变化的主要因素是径流深,各主要离子与径流深之间存在显著的相关性,径流深<120mm相关性最为显著,径流深>120mm相关性减弱,优势离子在径流深5～46mm区间内根据径流深的变化而转换,表现出随径流深变化的规律性.
The spatial pattern of natural hydrochemistry features of the rivers in Gansu Province and its controlling factors are analyzed based the water quality monitoring data from 108 main rivers and 128 stations for near 60 years. It is found that the natural hydrochemistry spatial pattern of the rivers in Gansu Province can be divided into Qilian Mountainous area,Gannan plateau area,Loess Highland arid area,Loess Highland semi-moist area and Longnan moist area,of which the main ion concentration is close to each other. The weighted average main ion concentration of the rivers in the province is slightly higher than that of the Yellow River basin,but is higher than that of the Yangtze River basin obviously. Among the main ions,Cl-or Na＋ has the maximum spatial changeability,while,HCO-3 or Ca2＋ has the minimum space changeability. Runoff depth,a synthesis factor that reflects the climate change,controls the hydrochemistry features change. Between the main ions and runoff depth there is a remarkable relativity,specially,when the runoff depth is less than 120 mm. When the runoff depth is more than 120 mm,the relativity is not remarkable. The dominant ion will shift in the runoff depth ranging from 5 to 46 mm,depending on runoff depth change,displaying a changing regularity with runoff depth.
出处
《冰川冻土》
CSCD
北大核心
2010年第2期373-380,共8页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新重要方向项目(KZCX1-YW-328)资助
关键词
水化学特征
分布规律
控制因素
甘肃河流
hydrochemistry features
distribution
controlling factor
rivers in Gansu
