Nitrate adsorption in some andisols developed under different moisture conditions
Nitrate adsorption in some andisols developed under different moisture conditions
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在不同湿度条件下开发的一些土壤中的硝酸盐吸附
DOI：
10.1080/00380768.2004.10408498
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发表时间：
2004
影响因子：
2
通讯作者：
R. Kondo
中科院分区：
文献类型：
--
作者：
M. Tani;Takuya Okuten;M. Koike;K. Kuramochi;R. Kondo
摘要农田硝酸盐淋失是关系到环境质量和人类健康的重要问题之一。虽然在许多研究中已分析了热带和亚热带地区土壤的表面电荷特性和硝酸盐的吸附，但很少有研究进行了他生型土壤的硝酸盐保持特性。研究了北海道十日町3个安地土壤表层和下层土壤对硝酸盐的潜在吸附能力及其影响因素。在pH 6.0的条件下，硝酸盐的吸附量很低，甚至可以忽略不计，（Melanaquands），尽管粘土含量高，但从Langmuir方程计算的硝酸盐吸附最大值在Haplic Andisol的较低层中较高（Melanudands）和Lowhumic Andisol（Hap ludands），其在中度至中度干燥的水分条件下开发，并显示出高水铝英石含量和低总碳含量。的aliophanic Andisols的硝酸盐吸附量远高于其他研究中进行的Ultisol和Oxisol，这是丰富的铁氧化物。在预测土壤中硝酸盐的去向和随之而来的地下水污染的缓解时，应考虑到吸附硝酸盐和延缓硝酸盐移动的潜在能力。
Abstract Nitrate leaching from agricultural lands is one of the most critical problems related to both environmental quality and human health. Although in many studies surfacecharge properties of and nitrate adsorption in soils have been analyzed in tropical and subtropical regions, fewer studies have been conducted on the nitrateretention properties of allo phanic Andisols. The objectives of the present study were to examine the potential nitrate adsorption capacity and the factors affecting nitrate retention in topsoils and subsoils of three Andisols Tokaachi, Hokkaido. Nitrate adsorption at pH 6.0 was found to be low or negligible even in the subsoil of a Haplic Wet Andisol (Melanaquands), despite the high clay content, Nitrate adsorption maxima calculated from the Langmuir equation were higher in the lower horizons of a Haplic Andisol (Melanudands) and a Lowhumic Andisol (Hap ludands), which were developed under moderate to moderately dry moisture conditions and displayed a high allophane content and a low total carbon content. The nitrate adsorption of the aliophanic Andisols was much higher than that reported from other studies conducted in Ultisols and Oxisols, which are rich in iron oxides. The potential capacity to adsorb nitrates and retard nitrate movement should be taken into account in predicting the fate of nitrate in soils and the consequent mitigation of groundwater contamination.