摘要
于2012-2013年的四季分别在桂江流域采集水样,每次采样分别取15个样品,通过研究发现流域内水化学在不同的时间和空间具有不同的变化特征.研究表明：（1）桂江流域四季pH 值介于6.32-8.87,平均值为7.61;EC 变化在18~379μs/cm 之间,平均值为170μs/cm;SIc变化范围为-4.04-0.98,平均值为-0.74;桂江的水化学类型以HCO3-Ca型为主.（2）Ca2＋ ,Mg2＋ ,HCO- 3 和SIc在流域的变化特征相似,总体呈现中游高上下游低的特点.由于工农业活动的影响,SO24- 和NO3- 在桂江流域上游和中游的部分支流相对较高.Cl- ,Na＋ 和K＋ 总体上看中下游较高,是由于大气降水和下游砂页岩的影响而成.（3）桂江流域河水主要离子在冬季含量最高夏季最低,秋季和春季其次,主要是由于夏季降水较多,河流中溶解的主离子被大量雨水稀释,冬季则相反.关 键 词：桂江流域;河流;水化学;
Water samples in Guijiang basin in the four seasons of the years from 2012 to 2013 have been col-lected,and each sampling 1 5 samples have been taken.Through the studies it has been found that the internal chemical changes in different time and space have different characteristics.Studies have shown that 1 ）pH val-ues between 6.32-8.87 in Guijiang basin,an average of 7.61;EC change between 18-379μs/cm,an av-erage of 170μs/cm;SIc range of -4.04-0.98,mean of -0.74;the water-chemical type of Guijiang basin is HCO-3-Ca;2）Ca2＋,Mg2＋,HCO-3 and SIc in the basin changing characteristics are similar,general char-acteristics of high on the middle and lower upstream and downstream,and due to the impact of industrial and agricultural activities,SO2-4 and NO-3 at some tributaries are relatively high in the Guijiang basin of the up-per and middle reaches,and Cl-,Na＋ and K＋ on the whole middle and lower reaches of a higher,mainly due to atmospheric precipitation and effects of sandstone and shale in the lower;3）highest concentrations of the major ions in the winter,summer is the lowest in the Guijiang basin,followed in spring and in au-tumn,mainly due to higher rainfall in summer,rivers primary ions are dissolved in water diluted and win-ter does the opposite.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第3期158-165,共8页
Journal of Southwest China Normal University(Natural Science Edition)
基金
中国典型地区地质碳汇动态评价(12120113005100)
关键词
桂江流域
河流
水化学
岩溶
Guij iang Basin
rivers
water chemistry
karst
