硝酸盐在土壤中垂向迁移规律研究
首发时间:2010-12-17
摘要:土壤中硝态氮淋失不仅影响土壤肥力,而且是地下水硝酸盐污染的主要来源,本文研究了饱和条件下硝酸盐在土壤中垂向迁移的影响因素,研究表明,在一定的水头压力下,浓度势决定了硝酸盐在土壤中的迁移速率,当进水硝酸盐浓度和土壤溶液硝酸盐的浓度相差大时,硝酸盐的浓度变化率就较大。当硝酸盐进水浓度不同时,高浓度的硝酸盐溶液在饱和土壤中向下迁移的速率比低浓度溶液快。不同土质对硝酸盐影响的主要因素是土壤的粘粒含量和孔隙率,在粘粒含量低的土壤中,硝酸盐迁移速率比粘粒含量高的迁移速率大。不同阳离子态的硝酸盐对硝酸根的迁移基本不产生影响。
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Research on the Vertical Migration Regularity of Nitrate in Soil
Abstract: Nitrate leaching is not only a physical problem of improving fertilizer utilization ratio in soil, but also an important issue of groundwater pollution . This paper discusses the vertical migration regularity of nitrate at different conditions in saturated soil. Under certain hydraulic head pressure, the transfer speed of nitrate depends on concentration potential. When the concentration discrepancy between initial concentration and inherence concentration of soil solution is obviously, the velocity of nitrate concentration changed fast.With the initial concentration increases, the solution goes down faster to the deep soil and groundwater. The clay particle content and porosity also impact on nitrate migration, the higher clay particle content has , the faster nitrate goes down. Cation is less effect on nitrate migration.
Keywords: Environmental science Nitrate soil vertical Migration Soil column experiment
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No.4396993463271129****
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