Annual Element Budget of Soil in Snow-Dominated Forested Ecosystem
Annual Element Budget of Soil in Snow-Dominated Forested Ecosystem
复制标题
积雪森林生态系统土壤年度元素收支
DOI：
10.1023/a:1013877316949
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Sasa
中科院分区：
文献类型：
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作者：
M. Ozawa;H. Shibata;F. Satoh;K. Sasa
研究了日本北部北海道天然冷温混交林中穿透雨、树干径流、积雪和土壤溶液中主要无机离子的浓度和通量的季节变化，以阐明融雪对雪主区森林土壤溶质动态的影响。融雪期土壤溶液中Na+、Ca~(2+)、Mg~(2+)、Cl~(2+)、−和SO_4~(2+)−浓度波动较大。融雪期土壤中这些元素的产量占全年产量的百分比如下。镁离子：51%，钠、氯−分别为59%和60%，SO_2−：65%，Ca~(2+)：77%。我们的结果表明，融雪事件对量化该地区的年度要素预算非常重要。虽然土壤中盐基阳离子的淋失量大于输入和累积到植被中的盐基阳离子淋失量，但土壤中酸中和能力的年递减率(S)主要受盐基阳离子在植被中的累积所影响，这与土壤酸性和风化使碱阳离子伴随重碳酸盐的风化较慢有关。这表明，积雪为主地区ANC(S)较低的弱酸性土壤对未来酸性沉降量的增加相对敏感。
Seasonal fluctuation of concentration and flux of major inorganic ions in throughfall, stem flow, snowpack and soil solution was investigated at a natural cool temperature mixed forest in Hokkaido, northern Japan, in order to clarify the effect of snowmelt on the solute dynamics in the forest soil in snow-dominated region. Na+, Ca2+, Mg2+, Cl−and SO42−concentrations in soil solution showed a large fluctuation in the snowmelt period. The percentage of output of these elements from soil during the snowmelt period in the annual output was as follows. Mg2+: 51%, Na+and Cl−: 59 and 60%, SO42−: 65%, Ca2+: 77%. Our results indicated that the snowmelt event was very important to quantify the annual elemental budgets in this region. Although the leaching of base cation from the soil was larger than that of inputs and accumulation into the vegetation, annual decreasing rate of acid neutralization capacity (ANC(s)) from the soil was mostly affected by the base cation accumulation into the vegetation, related that the base cations weathering accompanied with bicarbonate was slow due to the acidic and weathered soil in the studied site. It is suggested that the weakly acidic soil which has low ANC(s)in snow-dominated region will be relatively sensitive to the future increase of acidic deposition.