敦煌地区土壤剖面硝酸盐的迁移累积规律

发布时间：2018-01-17 13:39

  本文关键词：敦煌地区土壤剖面硝酸盐的迁移累积规律　出处：《干旱区资源与环境》2016年05期 　论文类型：期刊论文

  更多相关文章： 敦煌 土壤 硝酸盐 迁移

【摘要】：包气带是连接大气层和含水层的关键地带,研究土壤中硝酸盐的迁移累积规律对防止地下水硝态氮污染至关重要。选取我国西北干旱区敦煌盆地典型土壤为研究对象,测定各土壤剖面中的Cl-和NO-3浓度,探究硝酸盐的迁移规律和影响因素。结果表明:Cl~-和NO_3~-主要集中在0~40cm近地表层土壤中,其硝酸盐的累积量占总累积量的80%以上,NO_3~-在1m的土壤剖面中呈S型迁移规律,适宜的含水率、疏松的土质和较高的植被覆盖度均有利于NO-3的垂向迁移;NO_3~-和Cl~-在沙漠中呈活塞式迁移规律,二者显著正相关并与含水率负相关,短暂的降雨和强烈的蒸发使硝酸盐在地表大量富集,深层土壤的含量高表明了硝酸盐的淋吸效应,较高的NO_3~-/Cl~-说明硝酸盐在干旱时富集度高。
[Abstract]:The aeration zone is the key zone connecting the atmosphere with the aquifer. It is very important to study nitrate migration and accumulation in soil to prevent nitrate pollution in groundwater. The typical soil of Dunhuang basin in arid area of northwest China is selected as the research object. Cl- and NO-3 concentrations in soil profiles were determined. The study of nitrate migration and its influencing factors showed that the concentration of the two species was mainly in the near-surface layer of 0 ~ 40 cm soil, and the results showed that the two species were mainly concentrated in the near-surface layer of 0 ~ (40 cm) soil. More than 80% of the total amount of nitrate accumulates in the soil profile of 1 m with S-type migration law and suitable moisture content. Loose soil quality and high vegetation coverage are beneficial to the vertical migration of NO-3. No _ 3 ~ (-) and Cl ~ (-) have a piston migration pattern in the desert. They are positively correlated and negatively correlated with water content. Short rainfall and strong evaporation result in a large amount of nitrate enrichment on the surface of the earth's surface. The high concentration of nitrate in the deep soil indicates the leaching effect of nitrate, and the higher NO3C _ (- / / Cl _ (-) -) indicates that the nitrate concentration is high during drought.
【作者单位】： 兰州大学资源环境学院;
【基金】：国家自然科学基金(41271039)资助
【分类号】：X144
【正文快照】： 水是人们赖以生存的宝贵资源,然而,我国水资源短缺以及日益严峻的水安全问题已经引起了社会的广泛关注[1-2]。目前各研究表明地下水硝酸盐污染已经十分严重[3-5],具有隐蔽性和难治理性[6]。地下水硝酸盐污染可能引起高铁血红蛋白症等疾病,甚至诱发癌症[7],危害人体健康。我国，

本文编号：1436492