SiO2 concentration of groundwater and streamwater in a small forested watershed
SiO2 concentration of groundwater and streamwater in a small forested watershed
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森林小流域地下水和河水的 SiO2 浓度
DOI：
10.3178/jjshwr.5.3
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Masakazu Suzuki
中科院分区：
文献类型：
--
作者：
Y. Shimada;N. Ohte;N. Tokuchi;Masakazu Suzuki
在一个森林覆盖的小流域，测量了雨水、秋季水、非饱和土壤水、地下水、泉水和溪水中的二氧化硅浓度。二氧化硅是一种可溶的化学物质，在天然水中相对含有。研究结果表明，1)雨水和干流中不含SiO_2。2)在土壤水的非饱和垂直入渗和暂时饱和的横向入渗过程中，SiO_2从土壤矿物中溶解出来。3)在饱和区，地下水中的SiO_2浓度稳定在一个特定的值中(对于基余实验流域，约为18 mg/L)，在地下水横向运动过程中不发生变化。4)泉水和溪水中的SiO_2浓度与地下水基本相同，没有降雨事件伴随着直接径流，从而稀释了泉水和溪水中的SiO_2浓度，从而导致SiO_2浓度较低。据估计，在基尔余实验流域，每年约有14~16g/m2的二氧化硅在表层土壤及其与基岩的边界溶解并流向河流。
The SiO2 concentrations of rain water, through fall, unsaturated soil water, groundwater, spring water and streamwater were measured in a small forested watershed. SiO2 is a soluble chemical substance which is comparatively contained in natural water. The results indicate the following points, 1) SiO2 is not contained in rain water and stemflow.2) SiO2 is dissolved from soil mineral during the process of unsaturated vertical infiltration and temporary saturated lateral infiltration of soil water.3) The SiO2 concentration of groundwater settles into one value which is peculiar to each watershed (approximately 18 mg/l in the case of Kiryu experimental watershed) at saturated zone and dose not change during lateral movement of groundwater.4) The SiO2 concentrations of spring and stream water are approximately same as groundwater without the rain events accompanied with direct runoff which dilute the spring and stream water to cause the lower concentration of SiO2.Furthermore it was estimated that approximately from 14 to 16g/m2 of SiO2 per year is dissolved at surface soil and its boundary with bed rock and run off to stream in Kiryu experimental watershed.