Chemistry of Stream Water in a Snowy Temperate Watershed
Chemistry of Stream Water in a Snowy Temperate Watershed
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雪温带流域溪流水的化学
DOI：
10.5026/jgeography.105.1
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发表时间：
1996
影响因子：
3.1
通讯作者：
Keisuke Suzuki
中科院分区：
文献类型：
--
作者：
Keisuke Suzuki
在福岛县会津田岛对一个小型森林流域的溪流水进行了化学研究。实验流域属雪温带气候，面积0.14平方公里。流域的基岩由新近纪形成的固结沉积物组成。流域完全被森林植被覆盖。夏季观测到最大月降水量，但在融雪季节记录到最大月径流。溪流水中的HCO3-浓度被雪融水稀释，在融雪季节观察到Cl-、NO3-和SO24-浓度呈间歇性增加。融雪季节溪水的pH值低于夏季和秋季。溪流水的离子组成随季节变化。夏季阴离子以碳酸氢根为主，融雪季节Cl-+NO3-+SO24-比例增加。将因子分析应用于溪流水化学数据矩阵。在冬季，与溪流水酸度相关的因子1的解释方差为38.7%，与海水来源相关的因子2的解释方差为28.4%。河流化学变化的三分之二可以用积雪融化释放的化学因子来解释。
Chemical studies of the stream water in a small forested watershed were conducted at Aidzu-Tajima, Fukushima prefecture. The experimental watershed is located under the snowy temperate climate, and has an area of 0.14 km2. The bedrock of the watershed consists of consolidated sediment formed in the Neogene. The watershed is entirely covered with forest vegetation. Maximum monthly precipitation is observed in summer however, maximum monthly runoff is recorded in snowmelt season. The HCO3- concentration of stream water is diluted by snow meltwater, and episodic increase of concentrations of Cl-, NO3- and SO24- is observed during the snowmelt season. The pH of stream water is lower during the snowmelt season than summer and autumn. The ionic composition of stream water is variable according to the seasons. Bicarbonate is the major anion in summer, and the ratio of Cl-+NO3-+SO24- increases in snowmelt season. The factor analysis is applied to the data matrix of chemistry of stream water. In the winter season, the explained variance of factor 1 which relates to acidity of stream water is 38.7 %, and the explained variance of factor 2 which relates to sea water origin is 28.4 %. Two thirds of variation of stream chemistry is explained by the chemical factor released from snowcover by melting.