Adsorption of Phosphorus Infiltrating Andosol in Aso Caldera, Kumamoto
Adsorption of Phosphorus Infiltrating Andosol in Aso Caldera, Kumamoto
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DOI：
10.2965/jwet.19-068
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发表时间：
2020
影响因子：
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通讯作者：
Daisuke Yumioka;T. Hama;K. Kitamura;S. Hatate;Hiroaki Ito;Y. Kawagoshi
中科院分区：
文献类型：
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作者：
Daisuke Yumioka;T. Hama;K. Kitamura;S. Hatate;Hiroaki Ito;Y. Kawagoshi
在熊本市阿索破火山口地下水中检测到高浓度的磷（超过1.0 mgP/L）。这一事实表明，磷可以通过地下水流迁移。研究了水稻土对磷素的吸附特性。采用连续流动系统，采用土柱法研究了土壤对重金属的吸附能力。土壤磷分为水溶性磷（Water-P）、碳酸氢钠和连二硫酸钠提取的磷（DB-P）、氢氧化钠提取的磷（NaOH-P）、盐酸提取的磷（HCl-P）和残留磷（Res-P）5个组分。结果表明，水的流速是控制土壤磷吸附的重要因素。流速越低，上游土壤吸附的磷越多。流速较大时，磷在土柱中分布较均匀。NaOH-P占吸附态磷的52%，说明NaOH-P是控制土壤磷吸附的最主要组分。
High concentration (more than 1.0 mgP/L) of phosphorus was detected in groundwater in Aso caldera, Kumamoto. The fact indicates phosphorus can be transported by groundwater flows. The objective of this study is to clarify the characteristics of paddy soil (Andosol) in phosphorus adsorption process. Adsorption capacity of the Andosol was evaluated by continuously-flowing system using the soil column. In addition, soil phosphorus was categorized into five fractions; water-extractable phosphorus (Water-P), phosphorus extracted by sodium bicarbonate and sodium dithionate (DB-P), phosphorus extracted by sodium hydroxide (NaOH-P), phosphorus extracted by hydrochloric acid (HCl-P) and residual phosphorus (Res-P). As a result, it is confirmed that the flow rate of water is an important factor to control the phosphorus adsorption by the Andosol. The lower the flow rate is, the more phosphorus is adsorbed on the upstream soil. On the other hand, when the flow rate was high, phosphorus was evenly distributed in column soil. In addition, the fraction of NaOH-P accounted for 52% of the adsorbed phosphorus, suggesting that NaOH-P is the most important fraction which controls phosphorus adsorption to Andosol.