通过分析于2009年9月22日—28日期间，在玉龙雪山周边河流白水河采集的河水样品（采样间隔为2 h），对冰雪融水补给径流的日变化特征及其规律进行了深入研究．结果表明，白水河水中所测的阴离子以SO2－4含量最高，其次为NO－3和Cl－；阳离子中主要以Ca2＋、Mg2＋为主，其次为Na＋、K＋，不同于冰雪融水中的离子浓度序列Ca2＋＞Na＋＞K＋＞Mg2＋，反映了流域内基岩岩性对河水化学性质的影响；水体的pH值平均8．6，电导率介于29．9—73．5μS·cm－1之间，日周期波动幅度较大；受降雨影响时段，各离子含量峰值通常出现在16∶00左右，各离子含量随降雨量的增加呈增加态势（除SO2－4、NO－3外）；在无降雨影响下，随径流量的增加，各离子含量表现出减小趋势．
This study focused on the diurnal variation of major ions in Baishui river around Yulong Mountain. Water samples were collected continuously from 22th to 28th September, 2009, with a sampling interval of two hours. The samples were analyzed for their chemical composition, and the diurnal variation characteristics and pattern were investigated.The results showed that SO2-4 and NO-3 were the most abundant anions.Meanwhile water samples were mildly alkaline and were rich in Ca2+and Mg2+ cations,which is different from the ion distribution in glacier melt water ( Ca2+> Na+>K+>Mg2+) . It reflected the influence of bedrock lithology on the water chemistry in Mt. Yulong area. Mean pH value of the river water was 8.6,and the conductively varied between 29.9 to 73.5,which showed obvious diurnal fluctuation. The peak value of ion concentrations usually appeared at about 16∶00 each day,displaying positive correlations with the amount of rainfall ( except for SO2-4 , NO-3 ) during the period of rainfall. With the increase of runoff, concentrations of most ion showed a decreased trend without rain.
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