EFFECT OF ELEMENT CYCLE ON STREAMWATER CHEMISTRY IN FORESTED BASIN
EFFECT OF ELEMENT CYCLE ON STREAMWATER CHEMISTRY IN FORESTED BASIN
复制标题
元素循环对森林流域径流化学的影响
DOI：
10.2208/jscej.1988.399_131
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
K. Muraoka
中科院分区：
文献类型：
--
作者：
T. Hirata;K. Muraoka
在暴雨径流过程中，发现了两种类型的径流化学变化：第一类，在径流事件发生前，在退缩边缘恢复了与基流水平大致相同的浓度；II型，超过基本流量水平。ⅰ型主要溶质为SiO2，ⅱ型主要溶质为NO3—N。为了将森林生态系统中的元素循环与河流化学联系起来，对森林土壤中的元素含量进行了分析。这说明森林表层土壤中硅含量略低于深层土壤，而表层土壤中氮含量则大大富集。此外，土壤中元素含量的差异使土壤水的垂直化学性质在SiO2和NO3—N浓度上发生变化，从而通过土壤水淋滤产生径流水的化学变化。
Two types of the chemical changes of streamwater during storm runoff were found: Type I which recovers approximately the same concentration in the recession limb as the baseflow level prior to the runoff event; Type II which overshoots the baseflow level. Main solute belonging to Type I is SiO2, and that to Type II is NO3--N.To relate the element cycle in forest ecosystem to the streamwater chemistry, element content in forest soil was analyzed. This proves that silicon content in forest surface soil is somewhat lower than in deeper soil, while nitrogen becomes greatly enriched in surface soil. Besides, the difference between element contents in soil makes a change of vertical soilwater chemistry in SiO2 and NO3--N concentrations, and consequently generates the chemical changes of streamwater through soilwater leaching.