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首页> 外文期刊>Limnology >Acidification of freshwaters by red soil in a subtropical silicate rock area, Okinawa, Japan
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Acidification of freshwaters by red soil in a subtropical silicate rock area, Okinawa, Japan

机译：日本冲绳亚热带硅酸盐岩地区的红壤对淡水的酸化

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摘要

Two samples of red soil, one from Gushikawa Recreation Center (GRC) and one from Okinawa Royal Golf Club (ORGC), were examined for particle size distribution, textures, minerals, and chemical compositions. The effects of particle size and grinding of clay minerals on pH, electrical conductivity (EC), and dissolved chemical species were studied in deionized water and river water. The results of red soil solutions were compared with those of acidic waters found in red soil dominated areas. The minimum pH values of soil solutions extracted by deionized water were 4.38-5.36 and 5.16-5.89 and the maximum values of EC were 4.91-16.98mSm-1 and 3.54-11.23mSm-1 for GRC and ORGC, respectively. In the river water samples equilibrated with red soils, the minimum pH values were 4.48-5.10 and 4.77-5.91 and the maximum EC values were 19.6-34.2mSm-1 and 17.5-25.0mSm-1 for GRC and ORGC, respectively. The values of pH and EC varied with the soil-solution ratio and the particle size. The chemical composition of river water without mixing with red soil shows Na+ >K+ and Ca2+ >Mg2+. After mixing with red soil, the trend of the concentrations changed to Na+ >K+ and Mg2+ >Ca2+, which is the same as that of soil solutions in deionized water as well as that of acidic waters found in the red soil area. The pH of the acidic waters was 4.95-5.81 and EC was 7.76-30.0mSm-1. Laboratory experimental results agreed well with those found in the field in terms of trend of concentrations of the chemical species and pH. Therefore, the results of this study suggest that the low pH and trend of the concentrations of chemical species of the acidic waters found in the red soil dominated areas were the result of the interaction of natural water and red soil. [References: 27]
机译：检查了两种红色土壤样品，一种来自固河川娱乐中心（GRC），另一种来自冲绳皇家高尔夫俱乐部（ORGC），以检查粒度分布，质地，矿物质和化学成分。在去离子水和河水中研究了粘土矿物的粒径和研磨对pH值，电导率（EC）和溶解的化学物质的影响。将红壤溶液的结果与在红壤主导地区发现的酸性水的结果进行了比较。去离子水提取的土壤溶液的最小pH值分别为4.38-5.36和5.16-5.89，EC的最大值分别为GRC和ORGC的4.91-16.98mSm-1和3.54-11.23mSm-1。在用红壤平衡的河水样品中，GRC和ORGC的最小pH值分别为4.48-5.10和4.77-5.91，最大EC值分别为19.6-34.2mSm-1和17.5-25.0mSm-1。 pH和EC的值随土壤溶液的比例和粒径而变化。未与红壤混合的河水化学成分显示Na +> K +和Ca2 +> Mg2 +。与红壤混合后，其浓度变化趋势变为Na +> K +和Mg2 +> Ca2 +，这与去离子水中的土壤溶液以及在红壤地区发现的酸性水相同。酸性水的pH为4.95-5.81，EC为7.76-30.0mSm-1。就化学物质浓度和pH的趋势而言，实验室实验结果与本领域发现的结果非常吻合。因此，本研究结果表明，在红壤为主地区发现的低pH值和酸性水化学物种浓度的趋势是天然水与红壤相互作用的结果。 [参考：27]

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